/*
* Do a private RSA, removes the PKCS#1 v1.5 padding
*/
int rsa_pkcs1_decrypt( rsa_context *ctx,
unsigned char *input, int ilen,
unsigned char *output, int *olen )
{
int ret;
unsigned char *p, buf[512];
if( ilen != ctx->len || ilen < 16 || ilen > 512 )
return( ERR_RSA_BAD_INPUT_DATA );
if( ( ret = rsa_private( ctx, input, ilen, buf, &ilen ) ) != 0 )
return( ret );
p = buf;
if( *p++ != 0 || *p++ != RSA_CRYPT )
return( ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + ilen - 1 )
return( ERR_RSA_INVALID_PADDING );
p++;
}
p++;
if( *olen < ilen - (int)(p - buf) )
return( ERR_RSA_INVALID_PADDING );
*olen = ilen - (int)(p - buf);
memcpy( output, p, *olen );
return( 0 );
}
/*
* Do a private RSA and remove the PKCS1 v1.5 padding
*/
int rsa_pkcs1_decrypt( rsa_context *ctx,
uchar *input, int ilen,
uchar *output, int *olen )
{
uchar *p, tmp[512];
if( ilen != ctx->len || ilen < 48 || ilen > 512 )
return( ERR_RSA_DECRYPT_FAILED );
if( rsa_private( ctx, input, ilen, tmp, ilen ) != 0 )
return( ERR_RSA_DECRYPT_FAILED );
p = tmp;
if( *p++ != 0 || *p++ != RSA_CRYPT )
return( ERR_RSA_DECRYPT_FAILED );
while( *p != 0 )
{
if( p >= tmp + ilen - 1 )
return( ERR_RSA_DECRYPT_FAILED );
p++;
}
p++;
if( *olen < ilen - (int)(p - tmp) )
return( ERR_RSA_DECRYPT_FAILED );
*olen = ilen - (int)(p - tmp);
memcpy( output, p, *olen );
return( 0 );
}
/*
* Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-ENCRYPT function
*/
int rsa_rsaes_pkcs1_v15_encrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t ilen,
const unsigned char *input,
unsigned char *output )
{
size_t nb_pad, olen;
int ret;
unsigned char *p = output;
if( mode == RSA_PRIVATE && ctx->padding != RSA_PKCS_V15 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
if( f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
olen = ctx->len;
if( olen < ilen + 11 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
nb_pad = olen - 3 - ilen;
*p++ = 0;
if( mode == RSA_PUBLIC )
{
*p++ = RSA_CRYPT;
while( nb_pad-- > 0 )
{
int rng_dl = 100;
do {
ret = f_rng( p_rng, p, 1 );
} while( *p == 0 && --rng_dl && ret == 0 );
// Check if RNG failed to generate data
//
if( rng_dl == 0 || ret != 0 )
return( POLARSSL_ERR_RSA_RNG_FAILED + ret );
p++;
}
}
else
{
*p++ = RSA_SIGN;
while( nb_pad-- > 0 )
*p++ = 0xFF;
}
*p++ = 0;
memcpy( p, input, ilen );
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, output, output )
: rsa_private( ctx, f_rng, p_rng, output, output ) );
}
/*
Add the message padding, then do an RSA operation
*/
int rsa_pkcs1_encrypt(rsa_context *ctx, int mode, int ilen, uchar *input, uchar *output)
{
int nb_pad, olen;
uchar *p = output;
olen = ctx->len;
switch (ctx->padding) {
case RSA_PKCS_V15:
if (ilen < 0 || olen < ilen + 11) {
return EST_ERR_RSA_BAD_INPUT_DATA;
}
nb_pad = olen - 3 - ilen;
*p++ = 0;
*p++ = RSA_CRYPT;
while (nb_pad-- > 0) {
do {
*p = (uchar)rand();
} while (*p == 0);
p++;
}
*p++ = 0;
memcpy(p, input, ilen);
break;
default:
return EST_ERR_RSA_INVALID_PADDING;
}
return (mode == RSA_PUBLIC) ? rsa_public(ctx, output, output) : rsa_private(ctx, output, output);
}
/*
* Do an RSA operation, then remove the message padding
*/
int rsa_pkcs1_decrypt( rsa_context *ctx,
int mode, int *olen,
unsigned char *input,
unsigned char *output,
int output_max_len)
{
int ret, ilen;
unsigned char *p;
unsigned char buf[1024];
ilen = ctx->len;
if( ilen < 16 || ilen > (int) sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, input, buf );
if( ret != 0 )
return( ret );
p = buf;
switch( ctx->padding )
{
case RSA_PKCS_V15:
if( *p++ != 0 || *p++ != RSA_CRYPT )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + ilen - 1 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
break;
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
if (ilen - (int)(p - buf) > output_max_len)
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
*olen = ilen - (int)(p - buf);
memcpy( output, p, *olen );
return( 0 );
}
/*
* Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function
*/
int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len)
{
int ret;
size_t ilen, pad_count = 0, i;
unsigned char *p, bad, pad_done = 0;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
if( mode == RSA_PRIVATE && ctx->padding != RSA_PKCS_V15 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ilen = ctx->len;
if( ilen < 16 || ilen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, f_rng, p_rng, input, buf );
if( ret != 0 )
return( ret );
p = buf;
bad = 0;
/*
* Check and get padding len in "constant-time"
*/
bad |= *p++; /* First byte must be 0 */
/* This test does not depend on secret data */
if( mode == RSA_PRIVATE )
{
bad |= *p++ ^ RSA_CRYPT;
/* Get padding len, but always read till end of buffer
* (minus one, for the 00 byte) */
for( i = 0; i < ilen - 3; i++ )
{
pad_done |= ((p[i] | (unsigned char)-p[i]) >> 7) ^ 1;
pad_count += ((pad_done | (unsigned char)-pad_done) >> 7) ^ 1;
}
p += pad_count;
bad |= *p++; /* Must be zero */
}
/*
* Add the message padding, then do an RSA operation
*/
int rsa_pkcs1_encrypt( rsa_context *ctx,
int (*f_rng)(void *),
void *p_rng,
int mode, int ilen,
const unsigned char *input,
unsigned char *output )
{
int nb_pad, olen;
unsigned char *p = output;
olen = ctx->len;
switch( ctx->padding )
{
case RSA_PKCS_V15:
if( ilen < 0 || olen < ilen + 11 || f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
nb_pad = olen - 3 - ilen;
*p++ = 0;
*p++ = RSA_CRYPT;
while( nb_pad-- > 0 )
{
int rng_dl = 100;
do {
*p = (unsigned char) f_rng( p_rng );
} while( *p == 0 && --rng_dl );
// Check if RNG failed to generate data
//
if( rng_dl == 0 )
return POLARSSL_ERR_RSA_RNG_FAILED;
p++;
}
*p++ = 0;
memcpy( p, input, ilen );
break;
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, output, output )
: rsa_private( ctx, output, output ) );
}
/*
Do an RSA operation, then remove the message padding
*/
int rsa_pkcs1_decrypt(rsa_context *ctx, int mode, int *olen, uchar *input, uchar *output, int output_max_len)
{
int ret, ilen;
uchar *p;
uchar buf[512];
ilen = ctx->len;
if (ilen < 16 || ilen > (int)sizeof(buf)) {
return EST_ERR_RSA_BAD_INPUT_DATA;
}
ret = (mode == RSA_PUBLIC) ? rsa_public(ctx, input, buf) : rsa_private(ctx, input, buf);
if (ret != 0) {
return ret;
}
p = buf;
switch (ctx->padding) {
case RSA_PKCS_V15:
if (*p++ != 0 || *p++ != RSA_CRYPT) {
return EST_ERR_RSA_INVALID_PADDING;
}
while (*p != 0) {
if (p >= buf + ilen - 1) {
return EST_ERR_RSA_INVALID_PADDING;
}
p++;
}
p++;
break;
default:
return EST_ERR_RSA_INVALID_PADDING;
}
if (ilen - (int)(p - buf) > output_max_len) {
return EST_ERR_RSA_OUTPUT_TO_LARGE;
}
*olen = ilen - (int)(p - buf);
memcpy(output, p, *olen);
return 0;
}
/*
* Implementation of the PKCS#1 v2.1 RSASSA-PSS-SIGN function
*/
int rsa_rsassa_pss_sign( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
int hash_id,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
size_t olen;
unsigned char *p = sig;
unsigned char salt[POLARSSL_MD_MAX_SIZE];
unsigned int slen, hlen, offset = 0;
int ret;
size_t msb;
const md_info_t *md_info;
md_context_t md_ctx;
if( ctx->padding != RSA_PKCS_V21 || f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
olen = ctx->len;
switch( hash_id )
{
case SIG_RSA_MD2:
case SIG_RSA_MD4:
case SIG_RSA_MD5:
hashlen = 16;
break;
case SIG_RSA_SHA1:
hashlen = 20;
break;
case SIG_RSA_SHA224:
hashlen = 28;
break;
case SIG_RSA_SHA256:
hashlen = 32;
break;
case SIG_RSA_SHA384:
hashlen = 48;
break;
case SIG_RSA_SHA512:
hashlen = 64;
break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
slen = hlen;
if( olen < hlen + slen + 2 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
memset( sig, 0, olen );
msb = mpi_msb( &ctx->N ) - 1;
// Generate salt of length slen
//
if( ( ret = f_rng( p_rng, salt, slen ) ) != 0 )
return( POLARSSL_ERR_RSA_RNG_FAILED + ret );
// Note: EMSA-PSS encoding is over the length of N - 1 bits
//
msb = mpi_msb( &ctx->N ) - 1;
p += olen - hlen * 2 - 2;
*p++ = 0x01;
memcpy( p, salt, slen );
p += slen;
md_init_ctx( &md_ctx, md_info );
// Generate H = Hash( M' )
//
md_starts( &md_ctx );
md_update( &md_ctx, p, 8 );
md_update( &md_ctx, hash, hashlen );
md_update( &md_ctx, salt, slen );
md_finish( &md_ctx, p );
// Compensate for boundary condition when applying mask
//
if( msb % 8 == 0 )
offset = 1;
// maskedDB: Apply dbMask to DB
//
mgf_mask( sig + offset, olen - hlen - 1 - offset, p, hlen, &md_ctx );
md_free_ctx( &md_ctx );
msb = mpi_msb( &ctx->N ) - 1;
sig[0] &= 0xFF >> ( olen * 8 - msb );
p += hlen;
*p++ = 0xBC;
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, sig, sig ) );
}
/*
* Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function
*/
int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len)
{
int ret, correct = 1;
size_t ilen, pad_count = 0;
unsigned char *p, *q;
unsigned char bt;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
if( ctx->padding != RSA_PKCS_V15 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ilen = ctx->len;
if( ilen < 16 || ilen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, input, buf );
if( ret != 0 )
return( ret );
p = buf;
if( *p++ != 0 )
correct = 0;
bt = *p++;
if( ( bt != RSA_CRYPT && mode == RSA_PRIVATE ) ||
( bt != RSA_SIGN && mode == RSA_PUBLIC ) )
{
correct = 0;
}
if( bt == RSA_CRYPT )
{
while( *p != 0 && p < buf + ilen - 1 )
pad_count += ( *p++ != 0 );
correct &= ( *p == 0 && p < buf + ilen - 1 );
q = p;
// Also pass over all other bytes to reduce timing differences
//
while ( q < buf + ilen - 1 )
pad_count += ( *q++ != 0 );
// Prevent compiler optimization of pad_count
//
correct |= pad_count & 0x100000; /* Always 0 unless 1M bit keys */
p++;
}
else
{
while( *p == 0xFF && p < buf + ilen - 1 )
pad_count += ( *p++ == 0xFF );
correct &= ( *p == 0 && p < buf + ilen - 1 );
q = p;
// Also pass over all other bytes to reduce timing differences
//
while ( q < buf + ilen - 1 )
pad_count += ( *q++ != 0 );
// Prevent compiler optimization of pad_count
//
correct |= pad_count & 0x100000; /* Always 0 unless 1M bit keys */
p++;
}
if( correct == 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if (ilen - (p - buf) > output_max_len)
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
*olen = ilen - (p - buf);
memcpy( output, p, *olen );
return( 0 );
}
/*
* Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function
*/
int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
int mode,
const unsigned char *label, size_t label_len,
size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len )
{
int ret;
size_t ilen;
unsigned char *p;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
unsigned char lhash[POLARSSL_MD_MAX_SIZE];
unsigned int hlen;
const md_info_t *md_info;
md_context_t md_ctx;
if( ctx->padding != RSA_PKCS_V21 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ilen = ctx->len;
if( ilen < 16 || ilen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, input, buf );
if( ret != 0 )
return( ret );
p = buf;
if( *p++ != 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
md_init_ctx( &md_ctx, md_info );
// Generate lHash
//
md( md_info, label, label_len, lhash );
// seed: Apply seedMask to maskedSeed
//
mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1,
&md_ctx );
// DB: Apply dbMask to maskedDB
//
mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen,
&md_ctx );
p += hlen;
md_free_ctx( &md_ctx );
// Check validity
//
if( memcmp( lhash, p, hlen ) != 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p += hlen;
while( *p == 0 && p < buf + ilen )
p++;
if( p == buf + ilen )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if( *p++ != 0x01 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if (ilen - (p - buf) > output_max_len)
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
*olen = ilen - (p - buf);
memcpy( output, p, *olen );
return( 0 );
}
/*
* Implementation of the PKCS#1 v2.1 RSAES-OAEP-ENCRYPT function
*/
int rsa_rsaes_oaep_encrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
const unsigned char *label, size_t label_len,
size_t ilen,
const unsigned char *input,
unsigned char *output )
{
size_t olen;
int ret;
unsigned char *p = output;
unsigned int hlen;
const md_info_t *md_info;
md_context_t md_ctx;
if( ctx->padding != RSA_PKCS_V21 || f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
olen = ctx->len;
hlen = md_get_size( md_info );
if( olen < ilen + 2 * hlen + 2 || f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
memset( output, 0, olen );
*p++ = 0;
// Generate a random octet string seed
//
if( ( ret = f_rng( p_rng, p, hlen ) ) != 0 )
return( POLARSSL_ERR_RSA_RNG_FAILED + ret );
p += hlen;
// Construct DB
//
md( md_info, label, label_len, p );
p += hlen;
p += olen - 2 * hlen - 2 - ilen;
*p++ = 1;
memcpy( p, input, ilen );
md_init_ctx( &md_ctx, md_info );
// maskedDB: Apply dbMask to DB
//
mgf_mask( output + hlen + 1, olen - hlen - 1, output + 1, hlen,
&md_ctx );
// maskedSeed: Apply seedMask to seed
//
mgf_mask( output + 1, hlen, output + hlen + 1, olen - hlen - 1,
&md_ctx );
md_free_ctx( &md_ctx );
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, output, output )
: rsa_private( ctx, output, output ) );
}
/*
* Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function
*/
int rsa_rsassa_pss_verify( rsa_context *ctx,
int mode,
int hash_id,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
int ret;
size_t siglen;
unsigned char *p;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
unsigned char result[POLARSSL_MD_MAX_SIZE];
unsigned char zeros[8];
unsigned int hlen;
size_t slen, msb;
const md_info_t *md_info;
md_context_t md_ctx;
if( ctx->padding != RSA_PKCS_V21 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
siglen = ctx->len;
if( siglen < 16 || siglen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, sig, buf );
if( ret != 0 )
return( ret );
p = buf;
if( buf[siglen - 1] != 0xBC )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
switch( hash_id )
{
case SIG_RSA_MD2:
case SIG_RSA_MD4:
case SIG_RSA_MD5:
hashlen = 16;
break;
case SIG_RSA_SHA1:
hashlen = 20;
break;
case SIG_RSA_SHA224:
hashlen = 28;
break;
case SIG_RSA_SHA256:
hashlen = 32;
break;
case SIG_RSA_SHA384:
hashlen = 48;
break;
case SIG_RSA_SHA512:
hashlen = 64;
break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
slen = siglen - hlen - 1;
memset( zeros, 0, 8 );
// Note: EMSA-PSS verification is over the length of N - 1 bits
//
msb = mpi_msb( &ctx->N ) - 1;
// Compensate for boundary condition when applying mask
//
if( msb % 8 == 0 )
{
p++;
siglen -= 1;
}
if( buf[0] >> ( 8 - siglen * 8 + msb ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
md_init_ctx( &md_ctx, md_info );
mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx );
buf[0] &= 0xFF >> ( siglen * 8 - msb );
while( *p == 0 && p < buf + siglen )
p++;
if( p == buf + siglen ||
*p++ != 0x01 )
{
md_free_ctx( &md_ctx );
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
slen -= p - buf;
// Generate H = Hash( M' )
//
md_starts( &md_ctx );
md_update( &md_ctx, zeros, 8 );
md_update( &md_ctx, hash, hashlen );
md_update( &md_ctx, p, slen );
md_finish( &md_ctx, result );
md_free_ctx( &md_ctx );
if( memcmp( p + slen, result, hlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
/*
* Do an RSA operation to sign the message digest
*/
int rsa_rsassa_pkcs1_v15_sign( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
size_t nb_pad, olen, oid_size = 0;
unsigned char *p = sig;
const char *oid;
if( mode == RSA_PRIVATE && ctx->padding != RSA_PKCS_V15 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
olen = ctx->len;
nb_pad = olen - 3;
if( md_alg != POLARSSL_MD_NONE )
{
const md_info_t *md_info = md_info_from_type( md_alg );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
if( oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
nb_pad -= 10 + oid_size;
hashlen = md_get_size( md_info );
}
nb_pad -= hashlen;
if( ( nb_pad < 8 ) || ( nb_pad > olen ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
*p++ = 0;
*p++ = RSA_SIGN;
memset( p, 0xFF, nb_pad );
p += nb_pad;
*p++ = 0;
if( md_alg == POLARSSL_MD_NONE )
{
memcpy( p, hash, hashlen );
}
else
{
/*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm DigestAlgorithmIdentifier,
* digest Digest }
*
* DigestAlgorithmIdentifier ::= AlgorithmIdentifier
*
* Digest ::= OCTET STRING
*/
*p++ = ASN1_SEQUENCE | ASN1_CONSTRUCTED;
*p++ = (unsigned char) ( 0x08 + oid_size + hashlen );
*p++ = ASN1_SEQUENCE | ASN1_CONSTRUCTED;
*p++ = (unsigned char) ( 0x04 + oid_size );
*p++ = ASN1_OID;
*p++ = oid_size & 0xFF;
memcpy( p, oid, oid_size );
p += oid_size;
*p++ = ASN1_NULL;
*p++ = 0x00;
*p++ = ASN1_OCTET_STRING;
*p++ = hashlen;
memcpy( p, hash, hashlen );
}
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, f_rng, p_rng, sig, sig ) );
}
int main( int argc, char *argv[] )
{
int keysize;
unsigned long i, j, tsc;
unsigned char tmp[64];
#if defined(POLARSSL_ARC4_C)
arc4_context arc4;
#endif
#if defined(POLARSSL_DES_C)
des3_context des3;
des_context des;
#endif
#if defined(POLARSSL_AES_C)
aes_context aes;
#endif
#if defined(POLARSSL_CAMELLIA_C)
camellia_context camellia;
#endif
#if defined(POLARSSL_RSA_C) && defined(POLARSSL_BIGNUM_C) && \
defined(POLARSSL_GENPRIME)
rsa_context rsa;
#endif
#if defined(POLARSSL_HAVEGE_C)
havege_state hs;
#endif
#if defined(POLARSSL_CTR_DRBG_C)
ctr_drbg_context ctr_drbg;
#endif
((void) argc);
((void) argv);
memset( buf, 0xAA, sizeof( buf ) );
printf( "\n" );
#if defined(POLARSSL_MD4_C)
printf( HEADER_FORMAT, "MD4" );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
md4( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
md4( buf, BUFSIZE, tmp );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_MD5_C)
printf( HEADER_FORMAT, "MD5" );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
md5( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
md5( buf, BUFSIZE, tmp );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_SHA1_C)
printf( HEADER_FORMAT, "SHA-1" );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
sha1( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha1( buf, BUFSIZE, tmp );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_SHA2_C)
printf( HEADER_FORMAT, "SHA-256" );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
sha2( buf, BUFSIZE, tmp, 0 );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha2( buf, BUFSIZE, tmp, 0 );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_SHA4_C)
printf( HEADER_FORMAT, "SHA-512" );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
sha4( buf, BUFSIZE, tmp, 0 );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha4( buf, BUFSIZE, tmp, 0 );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_ARC4_C)
printf( HEADER_FORMAT, "ARC4" );
fflush( stdout );
arc4_setup( &arc4, tmp, 32 );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
arc4_crypt( &arc4, BUFSIZE, buf, buf );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
arc4_crypt( &arc4, BUFSIZE, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_DES_C)
printf( HEADER_FORMAT, "3DES" );
fflush( stdout );
des3_set3key_enc( &des3, tmp );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
des3_crypt_cbc( &des3, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
des3_crypt_cbc( &des3, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
printf( HEADER_FORMAT, "DES" );
fflush( stdout );
des_setkey_enc( &des, tmp );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
des_crypt_cbc( &des, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
des_crypt_cbc( &des, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_AES_C)
for( keysize = 128; keysize <= 256; keysize += 64 )
{
printf( " AES-%d : ", keysize );
fflush( stdout );
memset( buf, 0, sizeof( buf ) );
memset( tmp, 0, sizeof( tmp ) );
aes_setkey_enc( &aes, tmp, keysize );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
aes_crypt_cbc( &aes, AES_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 4096; j++ )
aes_crypt_cbc( &aes, AES_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
}
#endif
#if defined(POLARSSL_CAMELLIA_C)
for( keysize = 128; keysize <= 256; keysize += 64 )
{
printf( " CAMELLIA-%d : ", keysize );
fflush( stdout );
memset( buf, 0, sizeof( buf ) );
memset( tmp, 0, sizeof( tmp ) );
camellia_setkey_enc( &camellia, tmp, keysize );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
camellia_crypt_cbc( &camellia, CAMELLIA_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 4096; j++ )
camellia_crypt_cbc( &camellia, CAMELLIA_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
}
#endif
#if defined(POLARSSL_HAVEGE_C)
printf( HEADER_FORMAT, "HAVEGE" );
fflush( stdout );
havege_init( &hs );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
havege_random( &hs, buf, BUFSIZE );
tsc = hardclock();
for( j = 1; j < 1024; j++ )
havege_random( &hs, buf, BUFSIZE );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_CTR_DRBG_C)
printf( HEADER_FORMAT, "CTR_DRBG (NOPR)" );
fflush( stdout );
if( ctr_drbg_init( &ctr_drbg, myrand, NULL, NULL, 0 ) != 0 )
exit(1);
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
if( ctr_drbg_random( &ctr_drbg, buf, BUFSIZE ) != 0 )
exit(1);
tsc = hardclock();
for( j = 1; j < 1024; j++ )
if( ctr_drbg_random( &ctr_drbg, buf, BUFSIZE ) != 0 )
exit(1);
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
printf( HEADER_FORMAT, "CTR_DRBG (PR)" );
fflush( stdout );
if( ctr_drbg_init( &ctr_drbg, myrand, NULL, NULL, 0 ) != 0 )
exit(1);
ctr_drbg_set_prediction_resistance( &ctr_drbg, CTR_DRBG_PR_ON );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
if( ctr_drbg_random( &ctr_drbg, buf, BUFSIZE ) != 0 )
exit(1);
tsc = hardclock();
for( j = 1; j < 1024; j++ )
if( ctr_drbg_random( &ctr_drbg, buf, BUFSIZE ) != 0 )
exit(1);
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_RSA_C) && defined(POLARSSL_BIGNUM_C) && \
defined(POLARSSL_GENPRIME)
rsa_init( &rsa, RSA_PKCS_V15, 0 );
rsa_gen_key( &rsa, myrand, NULL, 1024, 65537 );
printf( HEADER_FORMAT, "RSA-1024" );
fflush( stdout );
set_alarm( 3 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, buf );
}
printf( "%9lu public/s\n", i / 3 );
printf( HEADER_FORMAT, "RSA-1024" );
fflush( stdout );
set_alarm( 3 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, buf );
}
printf( "%9lu private/s\n", i / 3 );
rsa_free( &rsa );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
rsa_gen_key( &rsa, myrand, NULL, 2048, 65537 );
printf( HEADER_FORMAT, "RSA-2048" );
fflush( stdout );
set_alarm( 3 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, buf );
}
printf( "%9lu public/s\n", i / 3 );
printf( HEADER_FORMAT, "RSA-2048" );
fflush( stdout );
set_alarm( 3 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, buf );
}
printf( "%9lu private/s\n", i / 3 );
rsa_free( &rsa );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
rsa_gen_key( &rsa, myrand, NULL, 4096, 65537 );
printf( HEADER_FORMAT, "RSA-4096" );
fflush( stdout );
set_alarm( 3 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, buf );
}
printf( "%9lu public/s\n", i / 3 );
printf( HEADER_FORMAT, "RSA-4096" );
fflush( stdout );
set_alarm( 3 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, buf );
}
printf( "%9lu private/s\n", i / 3 );
rsa_free( &rsa );
#endif
printf( "\n" );
#if defined(_WIN32)
printf( " Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( 0 );
}
/*
* Do an RSA operation and check the message digest
*/
int rsa_pkcs1_verify( rsa_context *ctx,
int mode,
int hash_id,
int hashlen,
unsigned char *hash,
unsigned char *sig )
{
int ret, len, siglen;
unsigned char *p, c;
unsigned char buf[1024];
siglen = ctx->len;
if( siglen < 16 || siglen > (int) sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, sig, buf );
if( ret != 0 )
return( ret );
p = buf;
switch( ctx->padding )
{
case RSA_PKCS_V15:
if( *p++ != 0 || *p++ != RSA_SIGN )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + siglen - 1 || *p != 0xFF )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
break;
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
len = siglen - (int)( p - buf );
if( len == 34 )
{
c = p[13];
p[13] = 0;
if( memcmp( p, ASN1_HASH_MDX, 18 ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( ( c == 2 && hash_id == SIG_RSA_MD2 ) ||
( c == 4 && hash_id == SIG_RSA_MD4 ) ||
( c == 5 && hash_id == SIG_RSA_MD5 ) )
{
if( memcmp( p + 18, hash, 16 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
}
if( len == 35 && hash_id == SIG_RSA_SHA1 )
{
if( memcmp( p, ASN1_HASH_SHA1, 15 ) == 0 &&
memcmp( p + 15, hash, 20 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( ( len == 19 + 28 && p[14] == 4 && hash_id == SIG_RSA_SHA224 ) ||
( len == 19 + 32 && p[14] == 1 && hash_id == SIG_RSA_SHA256 ) ||
( len == 19 + 48 && p[14] == 2 && hash_id == SIG_RSA_SHA384 ) ||
( len == 19 + 64 && p[14] == 3 && hash_id == SIG_RSA_SHA512 ) )
{
c = p[1] - 17;
p[1] = 17;
p[14] = 0;
if( p[18] == c &&
memcmp( p, ASN1_HASH_SHA2X, 18 ) == 0 &&
memcmp( p + 19, hash, c ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( len == hashlen && hash_id == SIG_RSA_RAW )
{
if( memcmp( p, hash, hashlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
/*
* Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function
*/
int rsa_rsassa_pss_verify_ext( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
md_type_t mgf1_hash_id,
int expected_salt_len,
const unsigned char *sig )
{
int ret;
size_t siglen;
unsigned char *p;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
unsigned char result[POLARSSL_MD_MAX_SIZE];
unsigned char zeros[8];
unsigned int hlen;
size_t slen, msb;
const md_info_t *md_info;
md_context_t md_ctx;
if( mode == RSA_PRIVATE && ctx->padding != RSA_PKCS_V21 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
siglen = ctx->len;
if( siglen < 16 || siglen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, f_rng, p_rng, sig, buf );
if( ret != 0 )
return( ret );
p = buf;
if( buf[siglen - 1] != 0xBC )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if( md_alg != POLARSSL_MD_NONE )
{
// Gather length of hash to sign
//
md_info = md_info_from_type( md_alg );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hashlen = md_get_size( md_info );
}
md_info = md_info_from_type( mgf1_hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
slen = siglen - hlen - 1; /* Currently length of salt + padding */
memset( zeros, 0, 8 );
// Note: EMSA-PSS verification is over the length of N - 1 bits
//
msb = mpi_msb( &ctx->N ) - 1;
// Compensate for boundary condition when applying mask
//
if( msb % 8 == 0 )
{
p++;
siglen -= 1;
}
if( buf[0] >> ( 8 - siglen * 8 + msb ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
md_init( &md_ctx );
md_init_ctx( &md_ctx, md_info );
mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx );
buf[0] &= 0xFF >> ( siglen * 8 - msb );
while( p < buf + siglen && *p == 0 )
p++;
if( p == buf + siglen ||
*p++ != 0x01 )
{
md_free( &md_ctx );
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
/* Actual salt len */
slen -= p - buf;
if( expected_salt_len != RSA_SALT_LEN_ANY &&
slen != (size_t) expected_salt_len )
{
md_free( &md_ctx );
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
// Generate H = Hash( M' )
//
md_starts( &md_ctx );
md_update( &md_ctx, zeros, 8 );
md_update( &md_ctx, hash, hashlen );
md_update( &md_ctx, p, slen );
md_finish( &md_ctx, result );
md_free( &md_ctx );
if( memcmp( p + slen, result, hlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
void rsa_generate_key(RSAPrivateKey *prv, RSAPublicKey *pub,
RandomState *state, unsigned int bits)
{
MP_INT test, aux;
unsigned int pbits, qbits;
int ret;
mpz_init(&prv->q);
mpz_init(&prv->p);
mpz_init(&prv->e);
mpz_init(&prv->d);
mpz_init(&prv->u);
mpz_init(&prv->n);
mpz_init(&test);
mpz_init(&aux);
/* Compute the number of bits in each prime. */
pbits = bits / 2;
qbits = bits - pbits;
#ifndef RSAREF
retry0:
#endif /* !RSAREF */
if (rsa_verbose)
{
fprintf(stderr, "Generating p: ");
}
/* Generate random number p. */
rsa_random_prime(&prv->p, state, pbits);
retry:
if (rsa_verbose)
{
fprintf(stderr, "Generating q: ");
}
/* Generate random number q. */
rsa_random_prime(&prv->q, state, qbits);
/* Sort them so that p < q. */
ret = mpz_cmp(&prv->p, &prv->q);
if (ret == 0)
{
if (rsa_verbose)
fprintf(stderr, "Generated the same prime twice!\n");
goto retry;
}
if (ret > 0)
{
mpz_set(&aux, &prv->p);
mpz_set(&prv->p, &prv->q);
mpz_set(&prv->q, &aux);
}
/* Make sure that p and q are not too close together (I am not sure if this
is important). */
mpz_sub(&aux, &prv->q, &prv->p);
mpz_div_2exp(&test, &prv->q, 10);
if (mpz_cmp(&aux, &test) < 0)
{
if (rsa_verbose)
fprintf(stderr, "The primes are too close together.\n");
goto retry;
}
/* Make certain p and q are relatively prime (in case one or both were false
positives... Though this is quite impossible). */
mpz_gcd(&aux, &prv->p, &prv->q);
if (mpz_cmp_ui(&aux, 1) != 0)
{
if (rsa_verbose)
fprintf(stderr, "The primes are not relatively prime!\n");
goto retry;
}
/* Derive the RSA private key from the primes. */
if (rsa_verbose)
fprintf(stderr, "Computing the keys...\n");
derive_rsa_keys(&prv->n, &prv->e, &prv->d, &prv->u, &prv->p, &prv->q, 5);
prv->bits = bits;
/* Initialize the public key with public data from the private key. */
pub->bits = bits;
mpz_init_set(&pub->n, &prv->n);
mpz_init_set(&pub->e, &prv->e);
#ifndef RSAREF /* I don't want to kludge these to work with RSAREF. */
/* Test that the key really works. This should never fail (I think). */
if (rsa_verbose)
fprintf(stderr, "Testing the keys...\n");
rsa_random_integer(&test, state, bits);
mpz_mod(&test, &test, &pub->n); /* must be less than n. */
rsa_private(&aux, &test, prv);
rsa_public(&aux, &aux, pub);
if (mpz_cmp(&aux, &test) != 0)
{
if (rsa_verbose)
fprintf(stderr, "**** private+public failed to decrypt.\n");
goto retry0;
}
rsa_public(&aux, &test, pub);
rsa_private(&aux, &aux, prv);
if (mpz_cmp(&aux, &test) != 0)
{
if (rsa_verbose)
fprintf(stderr, "**** public+private failed to decrypt.\n");
goto retry0;
}
#endif /* !RSAREF */
mpz_clear(&aux);
mpz_clear(&test);
if (rsa_verbose)
fprintf(stderr, "Key generation complete.\n");
}
/*
* Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function
*/
int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
int hash_id,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
int ret;
size_t len, siglen;
unsigned char *p, c;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
if( ctx->padding != RSA_PKCS_V15 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
siglen = ctx->len;
if( siglen < 16 || siglen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, f_rng, p_rng, sig, buf );
if( ret != 0 )
return( ret );
p = buf;
if( *p++ != 0 || *p++ != RSA_SIGN )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + siglen - 1 || *p != 0xFF )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
len = siglen - ( p - buf );
if( len == 33 && hash_id == SIG_RSA_SHA1 )
{
if( memcmp( p, ASN1_HASH_SHA1_ALT, 13 ) == 0 &&
memcmp( p + 13, hash, 20 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( len == 34 )
{
c = p[13];
p[13] = 0;
if( memcmp( p, ASN1_HASH_MDX, 18 ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( ( c == 2 && hash_id == SIG_RSA_MD2 ) ||
( c == 4 && hash_id == SIG_RSA_MD4 ) ||
( c == 5 && hash_id == SIG_RSA_MD5 ) )
{
if( memcmp( p + 18, hash, 16 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
}
if( len == 35 && hash_id == SIG_RSA_SHA1 )
{
if( memcmp( p, ASN1_HASH_SHA1, 15 ) == 0 &&
memcmp( p + 15, hash, 20 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( ( len == 19 + 28 && p[14] == 4 && hash_id == SIG_RSA_SHA224 ) ||
( len == 19 + 32 && p[14] == 1 && hash_id == SIG_RSA_SHA256 ) ||
( len == 19 + 48 && p[14] == 2 && hash_id == SIG_RSA_SHA384 ) ||
( len == 19 + 64 && p[14] == 3 && hash_id == SIG_RSA_SHA512 ) )
{
c = p[1] - 17;
p[1] = 17;
p[14] = 0;
if( p[18] == c &&
memcmp( p, ASN1_HASH_SHA2X, 18 ) == 0 &&
memcmp( p + 19, hash, c ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( len == hashlen && hash_id == SIG_RSA_RAW )
{
if( memcmp( p, hash, hashlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
/*
* Perform a private RSA to sign a message digest
*/
int rsa_pkcs1_sign( rsa_context *ctx, int alg_id,
unsigned char *hash, int hashlen,
unsigned char *sig, int siglen )
{
int nb_pad;
unsigned char *p = sig;
if( siglen != ctx->len || siglen < 16 )
return( ERR_RSA_BAD_INPUT_DATA );
switch( alg_id )
{
case RSA_RAW:
nb_pad = siglen - 3 - hashlen;
break;
case RSA_MD2:
case RSA_MD4:
case RSA_MD5:
nb_pad = siglen - 3 - 34;
break;
case RSA_SHA1:
nb_pad = siglen - 3 - 35;
break;
default:
return( ERR_RSA_BAD_INPUT_DATA );
}
if( nb_pad < 8 )
return( ERR_RSA_BAD_INPUT_DATA );
*p++ = 0;
*p++ = RSA_SIGN;
memset( p, 0xFF, nb_pad );
p += nb_pad;
*p++ = 0;
switch( alg_id )
{
case RSA_RAW:
memcpy( p, hash, hashlen );
break;
case RSA_MD2:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 2; break;
case RSA_MD4:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 4; break;
case RSA_MD5:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 5; break;
case RSA_SHA1:
memcpy( p, ASN1_HASH_SHA1, 15 );
memcpy( p + 15, hash, 20 );
break;
default:
return( ERR_RSA_BAD_INPUT_DATA );
}
return( rsa_private( ctx, sig, siglen, sig, &siglen ) );
}
/*
* Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function
*/
int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig )
{
int ret;
size_t len, siglen, asn1_len;
unsigned char *p, *end;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
md_type_t msg_md_alg;
const md_info_t *md_info;
asn1_buf oid;
if( mode == RSA_PRIVATE && ctx->padding != RSA_PKCS_V15 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
siglen = ctx->len;
if( siglen < 16 || siglen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, f_rng, p_rng, sig, buf );
if( ret != 0 )
return( ret );
p = buf;
if( *p++ != 0 || *p++ != RSA_SIGN )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + siglen - 1 || *p != 0xFF )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
len = siglen - ( p - buf );
if( len == hashlen && md_alg == POLARSSL_MD_NONE )
{
if( memcmp( p, hash, hashlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
md_info = md_info_from_type( md_alg );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hashlen = md_get_size( md_info );
end = p + len;
// Parse the ASN.1 structure inside the PKCS#1 v1.5 structure
//
if( ( ret = asn1_get_tag( &p, end, &asn1_len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( asn1_len + 2 != len )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( ( ret = asn1_get_tag( &p, end, &asn1_len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( asn1_len + 6 + hashlen != len )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( ( ret = asn1_get_tag( &p, end, &oid.len, ASN1_OID ) ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
oid.p = p;
p += oid.len;
if( oid_get_md_alg( &oid, &msg_md_alg ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( md_alg != msg_md_alg )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
/*
* assume the algorithm parameters must be NULL
*/
if( ( ret = asn1_get_tag( &p, end, &asn1_len, ASN1_NULL ) ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( ( ret = asn1_get_tag( &p, end, &asn1_len, ASN1_OCTET_STRING ) ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( asn1_len != hashlen )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( memcmp( p, hash, hashlen ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
p += hashlen;
if( p != end )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
return( 0 );
}
/*
* Do an RSA operation to sign the message digest
*/
int rsa_pkcs1_sign( rsa_context *ctx,
int mode,
int hash_id,
int hashlen,
unsigned char *hash,
unsigned char *sig )
{
int nb_pad, olen;
unsigned char *p = sig;
olen = ctx->len;
switch( ctx->padding )
{
case RSA_PKCS_V15:
switch( hash_id )
{
case RSA_RAW:
nb_pad = olen - 3 - hashlen;
break;
case RSA_MD2:
case RSA_MD4:
case RSA_MD5:
nb_pad = olen - 3 - 34;
break;
case RSA_SHA1:
nb_pad = olen - 3 - 35;
break;
default:
return( XYSSL_ERR_RSA_BAD_INPUT_DATA );
}
if( nb_pad < 8 )
return( XYSSL_ERR_RSA_BAD_INPUT_DATA );
*p++ = 0;
*p++ = RSA_SIGN;
memset( p, 0xFF, nb_pad );
p += nb_pad;
*p++ = 0;
break;
default:
return( XYSSL_ERR_RSA_INVALID_PADDING );
}
switch( hash_id )
{
case RSA_RAW:
memcpy( p, hash, hashlen );
break;
case RSA_MD2:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 2; break;
case RSA_MD4:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 4; break;
case RSA_MD5:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 5; break;
case RSA_SHA1:
memcpy( p, ASN1_HASH_SHA1, 15 );
memcpy( p + 15, hash, 20 );
break;
default:
return( XYSSL_ERR_RSA_BAD_INPUT_DATA );
}
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, sig, sig ) );
}
int main( void )
{
int keysize;
unsigned long i, j, tsc;
unsigned char buf[BUFSIZE];
unsigned char tmp[32];
arc4_context arc4;
des3_context des3;
des_context des;
aes_context aes;
rsa_context rsa;
memset( buf, 0xAA, sizeof( buf ) );
printf( "\n" );
/*
* MD2 timing
*/
printf( " MD2 : " );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
md2_csum( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 32; j++ )
md2_csum( buf, BUFSIZE, tmp );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* MD4 timing
*/
printf( " MD4 : " );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
md4_csum( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
md4_csum( buf, BUFSIZE, tmp );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* MD5 timing
*/
printf( " MD5 : " );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
md5_csum( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
md5_csum( buf, BUFSIZE, tmp );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* SHA-1 timing
*/
printf( " SHA-1 : " );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
sha1_csum( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha1_csum( buf, BUFSIZE, tmp );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* SHA-256 timing
*/
printf( " SHA-256 : " );
fflush( stdout );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
sha2_csum( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha2_csum( buf, BUFSIZE, tmp );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* ARC4 timing
*/
printf( " ARC4 : " );
fflush( stdout );
arc4_setup( &arc4, tmp, 32 );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
arc4_crypt( &arc4, buf, BUFSIZE );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
arc4_crypt( &arc4, buf, BUFSIZE );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* Triple-DES timing
*/
printf( " 3DES : " );
fflush( stdout );
des3_set_3keys( &des3, tmp );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
des3_cbc_encrypt( &des3, tmp, buf, buf, BUFSIZE );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
des3_cbc_encrypt( &des3, tmp, buf, buf, BUFSIZE );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* DES timing
*/
printf( " DES : " );
fflush( stdout );
des_set_key( &des, tmp );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
des_cbc_encrypt( &des, tmp, buf, buf, BUFSIZE );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
des_cbc_encrypt( &des, tmp, buf, buf, BUFSIZE );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
/*
* AES timings
*/
for( keysize = 128; keysize <= 256; keysize += 64 )
{
printf( " AES-%d : ", keysize );
fflush( stdout );
aes_set_key( &aes, tmp, keysize );
set_alarm( 1 );
for( i = 1; ! alarmed; i++ )
aes_cbc_encrypt( &aes, tmp, buf, buf, BUFSIZE );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
aes_cbc_encrypt( &aes, tmp, buf, buf, BUFSIZE );
printf( "%9ld Kb/s, %9ld cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
}
/*
* RSA-1024 timing
*/
printf( " RSA-1024 : " );
fflush( stdout );
rsa_gen_key( &rsa, 1024, 65537, myrand, NULL );
set_alarm( 4 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, 128, buf, 128 );
}
printf( "%9ld public/s\n", i / 4 );
printf( " RSA-1024 : " );
fflush( stdout );
set_alarm( 4 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, 128, buf, 128 );
}
printf( "%9ld private/s\n", i / 4 );
rsa_free( &rsa );
/*
* RSA-2048 timing
*/
printf( " RSA-2048 : " );
fflush( stdout );
rsa_gen_key( &rsa, 2048, 65537, myrand, NULL );
set_alarm( 4 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, 256, buf, 256 );
}
printf( "%9ld public/s\n", i / 4 );
printf( " RSA-2048 : " );
fflush( stdout );
set_alarm( 4 );
for( i = 1; ! alarmed; i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, 256, buf, 256 );
}
printf( "%9ld private/s\n\n", i / 4 );
rsa_free( &rsa );
#ifdef WIN32
printf( " Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( 0 );
}
/*
* Do an RSA operation and check the message digest
*/
int rsa_pkcs1_verify( rsa_context *ctx,
int mode,
int hash_id,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
int ret;
size_t len, siglen;
unsigned char *p, c;
unsigned char buf[1024];
#if defined(POLARSSL_PKCS1_V21)
unsigned char zeros[8];
unsigned int hlen;
size_t slen, msb;
const md_info_t *md_info;
md_context_t md_ctx;
#endif
siglen = ctx->len;
if( siglen < 16 || siglen > (int) sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, sig, buf );
if( ret != 0 )
return( ret );
p = buf;
switch( ctx->padding )
{
case RSA_PKCS_V15:
if( *p++ != 0 || *p++ != RSA_SIGN )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + siglen - 1 || *p != 0xFF )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
len = siglen - (int)( p - buf );
if( len == 34 )
{
c = p[13];
p[13] = 0;
if( memcmp( p, ASN1_HASH_MDX, 18 ) != 0 )
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
if( ( c == 2 && hash_id == SIG_RSA_MD2 ) ||
( c == 4 && hash_id == SIG_RSA_MD4 ) ||
( c == 5 && hash_id == SIG_RSA_MD5 ) )
{
if( memcmp( p + 18, hash, 16 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
}
if( len == 35 && hash_id == SIG_RSA_SHA1 )
{
if( memcmp( p, ASN1_HASH_SHA1, 15 ) == 0 &&
memcmp( p + 15, hash, 20 ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( ( len == 19 + 28 && p[14] == 4 && hash_id == SIG_RSA_SHA224 ) ||
( len == 19 + 32 && p[14] == 1 && hash_id == SIG_RSA_SHA256 ) ||
( len == 19 + 48 && p[14] == 2 && hash_id == SIG_RSA_SHA384 ) ||
( len == 19 + 64 && p[14] == 3 && hash_id == SIG_RSA_SHA512 ) )
{
c = p[1] - 17;
p[1] = 17;
p[14] = 0;
if( p[18] == c &&
memcmp( p, ASN1_HASH_SHA2X, 18 ) == 0 &&
memcmp( p + 19, hash, c ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
if( len == hashlen && hash_id == SIG_RSA_RAW )
{
if( memcmp( p, hash, hashlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
}
break;
#if defined(POLARSSL_PKCS1_V21)
case RSA_PKCS_V21:
if( buf[siglen - 1] != 0xBC )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
switch( hash_id )
{
case SIG_RSA_MD2:
case SIG_RSA_MD4:
case SIG_RSA_MD5:
hashlen = 16;
break;
case SIG_RSA_SHA1:
hashlen = 20;
break;
case SIG_RSA_SHA224:
hashlen = 28;
break;
case SIG_RSA_SHA256:
hashlen = 32;
break;
case SIG_RSA_SHA384:
hashlen = 48;
break;
case SIG_RSA_SHA512:
hashlen = 64;
break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
slen = siglen - hlen - 1;
memset( &md_ctx, 0, sizeof( md_context_t ) );
memset( zeros, 0, 8 );
md_init_ctx( &md_ctx, md_info );
// Note: EMSA-PSS verification is over the length of N - 1 bits
//
msb = mpi_msb( &ctx->N ) - 1;
// Compensate for boundary condition when applying mask
//
if( msb % 8 == 0 )
{
p++;
siglen -= 1;
}
if( buf[0] >> ( 8 - siglen * 8 + msb ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx );
buf[0] &= 0xFF >> ( siglen * 8 - msb );
while( *p == 0 && p < buf + siglen )
p++;
if( p == buf + siglen )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if( *p++ != 0x01 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
slen -= p - buf;
// Generate H = Hash( M' )
//
md_starts( &md_ctx );
md_update( &md_ctx, zeros, 8 );
md_update( &md_ctx, hash, hashlen );
md_update( &md_ctx, p, slen );
md_finish( &md_ctx, p );
if( memcmp( p, p + slen, hlen ) == 0 )
return( 0 );
else
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
break;
#endif
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
/*
* Add the message padding, then do an RSA operation
*/
int rsa_pkcs1_encrypt( rsa_context *ctx,
int (*f_rng)(void *),
void *p_rng,
int mode, size_t ilen,
const unsigned char *input,
unsigned char *output )
{
size_t nb_pad, olen;
unsigned char *p = output;
#if defined(POLARSSL_PKCS1_V21)
unsigned int i, hlen;
const md_info_t *md_info;
md_context_t md_ctx;
#endif
olen = ctx->len;
if( f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
switch( ctx->padding )
{
case RSA_PKCS_V15:
if( olen < ilen + 11 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
nb_pad = olen - 3 - ilen;
*p++ = 0;
*p++ = RSA_CRYPT;
while( nb_pad-- > 0 )
{
int rng_dl = 100;
do {
*p = (unsigned char) f_rng( p_rng );
} while( *p == 0 && --rng_dl );
// Check if RNG failed to generate data
//
if( rng_dl == 0 )
return POLARSSL_ERR_RSA_RNG_FAILED;
p++;
}
*p++ = 0;
memcpy( p, input, ilen );
break;
#if defined(POLARSSL_PKCS1_V21)
case RSA_PKCS_V21:
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
if( olen < ilen + 2 * hlen + 2 || f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
memset( output, 0, olen );
memset( &md_ctx, 0, sizeof( md_context_t ) );
md_init_ctx( &md_ctx, md_info );
*p++ = 0;
// Generate a random octet string seed
//
for( i = 0; i < hlen; ++i )
*p++ = (unsigned char) f_rng( p_rng );
// Construct DB
//
md( md_info, p, 0, p );
p += hlen;
p += olen - 2 * hlen - 2 - ilen;
*p++ = 1;
memcpy( p, input, ilen );
// maskedDB: Apply dbMask to DB
//
mgf_mask( output + hlen + 1, olen - hlen - 1, output + 1, hlen,
&md_ctx );
// maskedSeed: Apply seedMask to seed
//
mgf_mask( output + 1, hlen, output + hlen + 1, olen - hlen - 1,
&md_ctx );
break;
#endif
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, output, output )
: rsa_private( ctx, output, output ) );
}
/*
* Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function
*/
int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
const unsigned char *label, size_t label_len,
size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len )
{
int ret;
size_t ilen, i, pad_len;
unsigned char *p, bad, pad_done;
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
unsigned char lhash[POLARSSL_MD_MAX_SIZE];
unsigned int hlen;
const md_info_t *md_info;
md_context_t md_ctx;
/*
* Parameters sanity checks
*/
if( mode == RSA_PRIVATE && ctx->padding != RSA_PKCS_V21 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ilen = ctx->len;
if( ilen < 16 || ilen > sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
/*
* RSA operation
*/
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, f_rng, p_rng, input, buf );
if( ret != 0 )
return( ret );
/*
* Unmask data and generate lHash
*/
hlen = md_get_size( md_info );
md_init( &md_ctx );
md_init_ctx( &md_ctx, md_info );
/* Generate lHash */
md( md_info, label, label_len, lhash );
/* seed: Apply seedMask to maskedSeed */
mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1,
&md_ctx );
/* DB: Apply dbMask to maskedDB */
mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen,
&md_ctx );
md_free( &md_ctx );
/*
* Check contents, in "constant-time"
*/
p = buf;
bad = 0;
bad |= *p++; /* First byte must be 0 */
p += hlen; /* Skip seed */
/* Check lHash */
for( i = 0; i < hlen; i++ )
bad |= lhash[i] ^ *p++;
/* Get zero-padding len, but always read till end of buffer
* (minus one, for the 01 byte) */
pad_len = 0;
pad_done = 0;
for( i = 0; i < ilen - 2 * hlen - 2; i++ )
{
pad_done |= p[i];
pad_len += ( pad_done == 0 );
}
p += pad_len;
bad |= *p++ ^ 0x01;
/*
* The only information "leaked" is whether the padding was correct or not
* (eg, no data is copied if it was not correct). This meets the
* recommendations in PKCS#1 v2.2: an opponent cannot distinguish between
* the different error conditions.
*/
if( bad != 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if( ilen - ( p - buf ) > output_max_len )
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
*olen = ilen - (p - buf);
memcpy( output, p, *olen );
return( 0 );
}
/*
* Do an RSA operation to sign the message digest
*/
int rsa_pkcs1_sign( rsa_context *ctx,
int mode,
int hash_id,
int hashlen,
unsigned char *hash,
unsigned char *sig )
{
int nb_pad, olen;
unsigned char *p = sig;
olen = ctx->len;
switch( ctx->padding )
{
case RSA_PKCS_V15:
switch( hash_id )
{
case SIG_RSA_RAW:
nb_pad = olen - 3 - hashlen;
break;
case SIG_RSA_MD2:
case SIG_RSA_MD4:
case SIG_RSA_MD5:
nb_pad = olen - 3 - 34;
break;
case SIG_RSA_SHA1:
nb_pad = olen - 3 - 35;
break;
case SIG_RSA_SHA224:
nb_pad = olen - 3 - 47;
break;
case SIG_RSA_SHA256:
nb_pad = olen - 3 - 51;
break;
case SIG_RSA_SHA384:
nb_pad = olen - 3 - 67;
break;
case SIG_RSA_SHA512:
nb_pad = olen - 3 - 83;
break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
if( nb_pad < 8 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
*p++ = 0;
*p++ = RSA_SIGN;
memset( p, 0xFF, nb_pad );
p += nb_pad;
*p++ = 0;
break;
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
switch( hash_id )
{
case SIG_RSA_RAW:
memcpy( p, hash, hashlen );
break;
case SIG_RSA_MD2:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 2; break;
case SIG_RSA_MD4:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 4; break;
case SIG_RSA_MD5:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 5; break;
case SIG_RSA_SHA1:
memcpy( p, ASN1_HASH_SHA1, 15 );
memcpy( p + 15, hash, 20 );
break;
case SIG_RSA_SHA224:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 28 );
p[1] += 28; p[14] = 4; p[18] += 28; break;
case SIG_RSA_SHA256:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 32 );
p[1] += 32; p[14] = 1; p[18] += 32; break;
case SIG_RSA_SHA384:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 48 );
p[1] += 48; p[14] = 2; p[18] += 48; break;
case SIG_RSA_SHA512:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 64 );
p[1] += 64; p[14] = 3; p[18] += 64; break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, sig, sig ) );
}
/*
* Do an RSA operation, then remove the message padding
*/
int rsa_pkcs1_decrypt( rsa_context *ctx,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len)
{
int ret;
size_t ilen;
unsigned char *p;
unsigned char buf[1024];
#if defined(POLARSSL_PKCS1_V21)
unsigned char lhash[POLARSSL_MD_MAX_SIZE];
unsigned int hlen;
const md_info_t *md_info;
md_context_t md_ctx;
#endif
ilen = ctx->len;
if( ilen < 16 || ilen > (int) sizeof( buf ) )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, input, buf );
if( ret != 0 )
return( ret );
p = buf;
switch( ctx->padding )
{
case RSA_PKCS_V15:
if( *p++ != 0 || *p++ != RSA_CRYPT )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
{
if( p >= buf + ilen - 1 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
break;
#if defined(POLARSSL_PKCS1_V21)
case RSA_PKCS_V21:
if( *p++ != 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
memset( &md_ctx, 0, sizeof( md_context_t ) );
md_init_ctx( &md_ctx, md_info );
// Generate lHash
//
md( md_info, lhash, 0, lhash );
// seed: Apply seedMask to maskedSeed
//
mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1,
&md_ctx );
// DB: Apply dbMask to maskedDB
//
mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen,
&md_ctx );
p += hlen;
// Check validity
//
if( memcmp( lhash, p, hlen ) != 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p += hlen;
while( *p == 0 && p < buf + ilen )
p++;
if( p == buf + ilen )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
if( *p++ != 0x01 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
break;
#endif
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
if (ilen - (int)(p - buf) > output_max_len)
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
*olen = ilen - (int)(p - buf);
memcpy( output, p, *olen );
return( 0 );
}
int main( void )
{
int keysize;
unsigned long i, j, tsc;
unsigned char tmp[64];
t_cpu_time timer;
/* Keep compiler happy */
UNUSED(keysize);
UNUSED(i);
UNUSED(j);
UNUSED(tsc);
UNUSED(tmp[0]);
UNUSED(timer);
// USART options.
static usart_serial_options_t USART_SERIAL_OPTIONS =
{
.baudrate = USART_SERIAL_EXAMPLE_BAUDRATE,
.charlength = USART_SERIAL_CHAR_LENGTH,
.paritytype = USART_SERIAL_PARITY,
.stopbits = USART_SERIAL_STOP_BIT
};
sysclk_init();
// Initialize the board.
// The board-specific conf_board.h file contains the configuration of the board
// initialization.
board_init();
// Initialize Serial Interface using Stdio Library
stdio_serial_init(USART_SERIAL_EXAMPLE,&USART_SERIAL_OPTIONS);
printf( "Start Benchmark\n");
#if defined(POLARSSL_ARC4_C)
arc4_context arc4;
#endif
#if defined(POLARSSL_DES_C)
des3_context des3;
des_context des;
#endif
#if defined(POLARSSL_AES_C)
aes_context aes;
#endif
#if defined(POLARSSL_CAMELLIA_C)
camellia_context camellia;
#endif
#if defined(POLARSSL_RSA_C)
rsa_context rsa;
#endif
memset( buf, 0xAA, sizeof( buf ) );
printf( "\n" );
#if defined(POLARSSL_MD4_C)
printf( " MD4 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
md4( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
md4( buf, BUFSIZE, tmp );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_MD5_C)
printf( " MD5 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
md5( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
md5( buf, BUFSIZE, tmp );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_SHA1_C)
printf( " SHA-1 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
sha1( buf, BUFSIZE, tmp );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha1( buf, BUFSIZE, tmp );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_SHA2_C)
printf( " SHA-256 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
sha2( buf, BUFSIZE, tmp, 0 );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha2( buf, BUFSIZE, tmp, 0 );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_SHA4_C)
printf( " SHA-512 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
sha4( buf, BUFSIZE, tmp, 0 );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
sha4( buf, BUFSIZE, tmp, 0 );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_ARC4_C)
printf( " ARC4 : " );
fflush( stdout );
arc4_setup( &arc4, tmp, 32 );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
arc4_crypt( &arc4, BUFSIZE, buf, buf );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
arc4_crypt( &arc4, BUFSIZE, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_DES_C)
printf( " 3DES : " );
fflush( stdout );
des3_set3key_enc( &des3, tmp );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
des3_crypt_cbc( &des3, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
des3_crypt_cbc( &des3, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
printf( " DES : " );
fflush( stdout );
des_setkey_enc( &des, tmp );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
des_crypt_cbc( &des, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 1024; j++ )
des_crypt_cbc( &des, DES_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
#endif
#if defined(POLARSSL_AES_C)
for( keysize = 128; keysize <= 256; keysize += 64 )
{
printf( " AES-%d : ", keysize );
fflush( stdout );
memset( buf, 0, sizeof( buf ) );
memset( tmp, 0, sizeof( tmp ) );
aes_setkey_enc( &aes, tmp, keysize );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
aes_crypt_cbc( &aes, AES_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 4096; j++ )
aes_crypt_cbc( &aes, AES_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
}
#endif
#if defined(POLARSSL_CAMELLIA_C)
for( keysize = 128; keysize <= 256; keysize += 64 )
{
printf( " CAMELLIA-%d : ", keysize );
fflush( stdout );
memset( buf, 0, sizeof( buf ) );
memset( tmp, 0, sizeof( tmp ) );
camellia_setkey_enc( &camellia, tmp, keysize );
cpu_set_timeout(cpu_ms_2_cy(1000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
camellia_crypt_cbc( &camellia, CAMELLIA_ENCRYPT, BUFSIZE, tmp, buf, buf );
tsc = hardclock();
for( j = 0; j < 4096; j++ )
camellia_crypt_cbc( &camellia, CAMELLIA_ENCRYPT, BUFSIZE, tmp, buf, buf );
printf( "%9lu Kb/s, %9lu cycles/byte\n", i * BUFSIZE / 1024,
( hardclock() - tsc ) / ( j * BUFSIZE ) );
}
#endif
#if defined(POLARSSL_RSA_C)
rsa_init( &rsa, RSA_PKCS_V15, 0 );
rsa_gen_key( &rsa, myrand, NULL, 1024, 65537 );
printf( " RSA-1024 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(3000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, buf );
}
printf( "%9lu public/s\n", i / 3 );
printf( " RSA-1024 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(3000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, buf );
}
printf( "%9lu private/s\n", i / 3 );
rsa_free( &rsa );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
rsa_gen_key( &rsa, myrand, NULL, 2048, 65537 );
printf( " RSA-2048 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(3000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, buf );
}
printf( "%9lu public/s\n", i / 3 );
printf( " RSA-2048 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(3000, CPU_HZ),&timer);
for( i = 1; ! cpu_is_timeout(&timer); i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, buf );
}
printf( "%9lu private/s\n", i / 3 );
rsa_free( &rsa );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
rsa_gen_key( &rsa, myrand, NULL, 4096, 65537 );
printf( " RSA-4096 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(3000, CPU_HZ),&timer);
for( i = 1; !cpu_is_timeout(&timer); i++ )
{
buf[0] = 0;
rsa_public( &rsa, buf, buf );
}
printf( "%9lu public/s\n", i / 3 );
printf( " RSA-4096 : " );
fflush( stdout );
cpu_set_timeout(cpu_ms_2_cy(3000, CPU_HZ),&timer);
for( i = 1; ! cpu_is_timeout(&timer); i++ )
{
buf[0] = 0;
rsa_private( &rsa, buf, buf );
}
printf( "%9lu private/s\n", i / 3 );
rsa_free( &rsa );
#endif
printf( "\n" );
#ifdef WIN32
printf( " Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( 0 );
}
/*
* Do an RSA operation to sign the message digest
*/
int rsa_pkcs1_sign( rsa_context *ctx,
int (*f_rng)(void *),
void *p_rng,
int mode,
int hash_id,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
size_t nb_pad, olen;
unsigned char *p = sig;
#if defined(POLARSSL_PKCS1_V21)
unsigned char salt[POLARSSL_MD_MAX_SIZE];
unsigned int i, slen, hlen, offset = 0;
size_t msb;
const md_info_t *md_info;
md_context_t md_ctx;
#else
(void) f_rng;
(void) p_rng;
#endif
olen = ctx->len;
switch( ctx->padding )
{
case RSA_PKCS_V15:
switch( hash_id )
{
case SIG_RSA_RAW:
nb_pad = olen - 3 - hashlen;
break;
case SIG_RSA_MD2:
case SIG_RSA_MD4:
case SIG_RSA_MD5:
nb_pad = olen - 3 - 34;
break;
case SIG_RSA_SHA1:
nb_pad = olen - 3 - 35;
break;
case SIG_RSA_SHA224:
nb_pad = olen - 3 - 47;
break;
case SIG_RSA_SHA256:
nb_pad = olen - 3 - 51;
break;
case SIG_RSA_SHA384:
nb_pad = olen - 3 - 67;
break;
case SIG_RSA_SHA512:
nb_pad = olen - 3 - 83;
break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
if( nb_pad < 8 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
*p++ = 0;
*p++ = RSA_SIGN;
memset( p, 0xFF, nb_pad );
p += nb_pad;
*p++ = 0;
switch( hash_id )
{
case SIG_RSA_RAW:
memcpy( p, hash, hashlen );
break;
case SIG_RSA_MD2:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 2; break;
case SIG_RSA_MD4:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 4; break;
case SIG_RSA_MD5:
memcpy( p, ASN1_HASH_MDX, 18 );
memcpy( p + 18, hash, 16 );
p[13] = 5; break;
case SIG_RSA_SHA1:
memcpy( p, ASN1_HASH_SHA1, 15 );
memcpy( p + 15, hash, 20 );
break;
case SIG_RSA_SHA224:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 28 );
p[1] += 28; p[14] = 4; p[18] += 28; break;
case SIG_RSA_SHA256:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 32 );
p[1] += 32; p[14] = 1; p[18] += 32; break;
case SIG_RSA_SHA384:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 48 );
p[1] += 48; p[14] = 2; p[18] += 48; break;
case SIG_RSA_SHA512:
memcpy( p, ASN1_HASH_SHA2X, 19 );
memcpy( p + 19, hash, 64 );
p[1] += 64; p[14] = 3; p[18] += 64; break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
break;
#if defined(POLARSSL_PKCS1_V21)
case RSA_PKCS_V21:
if( f_rng == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
switch( hash_id )
{
case SIG_RSA_MD2:
case SIG_RSA_MD4:
case SIG_RSA_MD5:
hashlen = 16;
break;
case SIG_RSA_SHA1:
hashlen = 20;
break;
case SIG_RSA_SHA224:
hashlen = 28;
break;
case SIG_RSA_SHA256:
hashlen = 32;
break;
case SIG_RSA_SHA384:
hashlen = 48;
break;
case SIG_RSA_SHA512:
hashlen = 64;
break;
default:
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
md_info = md_info_from_type( ctx->hash_id );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = md_get_size( md_info );
slen = hlen;
memset( sig, 0, olen );
memset( &md_ctx, 0, sizeof( md_context_t ) );
md_init_ctx( &md_ctx, md_info );
msb = mpi_msb( &ctx->N ) - 1;
// Generate salt of length slen
//
for( i = 0; i < slen; ++i )
salt[i] = (unsigned char) f_rng( p_rng );
// Note: EMSA-PSS encoding is over the length of N - 1 bits
//
msb = mpi_msb( &ctx->N ) - 1;
p += olen - hlen * 2 - 2;
*p++ = 0x01;
memcpy( p, salt, slen );
p += slen;
// Generate H = Hash( M' )
//
md_starts( &md_ctx );
md_update( &md_ctx, p, 8 );
md_update( &md_ctx, hash, hashlen );
md_update( &md_ctx, salt, slen );
md_finish( &md_ctx, p );
// Compensate for boundary condition when applying mask
//
if( msb % 8 == 0 )
offset = 1;
// maskedDB: Apply dbMask to DB
//
mgf_mask( sig + offset, olen - hlen - 1 - offset, p, hlen, &md_ctx );
msb = mpi_msb( &ctx->N ) - 1;
sig[0] &= 0xFF >> ( olen * 8 - msb );
p += hlen;
*p++ = 0xBC;
break;
#endif
default:
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, sig, sig ) );
}