int mbedtls_ecies_read_hmac(unsigned char **p, const unsigned char *end,
mbedtls_md_type_t *hmac_type, unsigned char **hmac, size_t *hmac_len)
{
int result = 0;
size_t len = 0;
mbedtls_asn1_buf hmac_alg;
if (hmac_type == NULL || hmac == NULL)
{
return MBEDTLS_ERR_ECIES_BAD_INPUT_DATA;
}
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
);
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_alg_null(p, end, &hmac_alg)
);
INVOKE_AND_CHECK(result,
mbedtls_oid_get_md_alg(&hmac_alg, hmac_type)
);
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, hmac_len, MBEDTLS_ASN1_OCTET_STRING)
);
*hmac = *p;
*p += *hmac_len;
return result;
}
/*
* X.509 CRL Entries
*/
static int x509_get_entries(unsigned char **p,
const unsigned char *end,
mbedtls_x509_crl_entry *entry) {
int ret;
size_t entry_len;
mbedtls_x509_crl_entry *cur_entry = entry;
if (*p == end)
return (0);
if ((ret = mbedtls_asn1_get_tag(p, end, &entry_len,
MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED)) != 0) {
if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG)
return (0);
return (ret);
}
end = *p + entry_len;
while (*p < end) {
size_t len2;
const unsigned char *end2;
if ((ret = mbedtls_asn1_get_tag(p, end, &len2,
MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED)) != 0) {
return (ret);
}
cur_entry->raw.tag = **p;
cur_entry->raw.p = *p;
cur_entry->raw.len = len2;
end2 = *p + len2;
if ((ret = mbedtls_x509_get_serial(p, end2, &cur_entry->serial)) != 0)
return (ret);
if ((ret = mbedtls_x509_get_time(p, end2,
&cur_entry->revocation_date)) != 0)
return (ret);
if ((ret = x509_get_crl_entry_ext(p, end2,
&cur_entry->entry_ext)) != 0)
return (ret);
if (*p < end) {
cur_entry->next = mbedtls_calloc(1, sizeof(mbedtls_x509_crl_entry));
if (cur_entry->next == NULL)
return (MBEDTLS_ERR_X509_ALLOC_FAILED);
cur_entry = cur_entry->next;
}
}
return (0);
}
/*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,
* value AttributeValue }
*
* AttributeType ::= OBJECT IDENTIFIER
*
* AttributeValue ::= ANY DEFINED BY AttributeType
*/
static int x509_get_attr_type_value( unsigned char **p,
const unsigned char *end,
mbedtls_x509_name *cur )
{
int ret;
size_t len;
mbedtls_x509_buf *oid;
mbedtls_x509_buf *val;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_X509_INVALID_NAME +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
oid = &cur->oid;
oid->tag = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &oid->len, MBEDTLS_ASN1_OID ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
oid->p = *p;
*p += oid->len;
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_X509_INVALID_NAME +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
if( **p != MBEDTLS_ASN1_BMP_STRING && **p != MBEDTLS_ASN1_UTF8_STRING &&
**p != MBEDTLS_ASN1_T61_STRING && **p != MBEDTLS_ASN1_PRINTABLE_STRING &&
**p != MBEDTLS_ASN1_IA5_STRING && **p != MBEDTLS_ASN1_UNIVERSAL_STRING &&
**p != MBEDTLS_ASN1_BIT_STRING )
return( MBEDTLS_ERR_X509_INVALID_NAME +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
val = &cur->val;
val->tag = *(*p)++;
if( ( ret = mbedtls_asn1_get_len( p, end, &val->len ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
val->p = *p;
*p += val->len;
cur->next = NULL;
return( 0 );
}
/*
* X.509 CRL v2 entry extensions (no extensions parsed yet.)
*/
static int x509_get_crl_entry_ext( unsigned char **p,
const unsigned char *end,
mbedtls_x509_buf *ext )
{
int ret;
size_t len = 0;
/* OPTIONAL */
if( end <= *p )
return( 0 );
ext->tag = **p;
ext->p = *p;
/*
* Get CRL-entry extension sequence header
* crlEntryExtensions Extensions OPTIONAL -- if present, MUST be v2
*/
if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
{
ext->p = NULL;
return( 0 );
}
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
}
end = *p + ext->len;
if( end != *p + ext->len )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
*p += len;
}
if( *p != end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
int mbedtls_ecies_read_kdf(unsigned char **p, const unsigned char *end,
mbedtls_kdf_type_t *kdf_type, mbedtls_md_type_t *md_type)
{
int result = 0;
size_t len = 0;
mbedtls_asn1_buf kdf_alg;
mbedtls_asn1_buf md_alg;
if (kdf_type == NULL || md_type == NULL)
{
return MBEDTLS_ERR_ECIES_BAD_INPUT_DATA;
}
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
);
if ((end - *p) < 1)
{
INVOKE_AND_CHECK(result, MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
kdf_alg.tag = **p;
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &kdf_alg.len, MBEDTLS_ASN1_OID)
);
kdf_alg.p = *p;
*p += kdf_alg.len;
INVOKE_AND_CHECK(result,
mbedtls_oid_get_kdf_alg(&kdf_alg, kdf_type)
);
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
);
md_alg.tag = **p;
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &md_alg.len, MBEDTLS_ASN1_OID)
);
md_alg.p = *p;
*p += md_alg.len;
INVOKE_AND_CHECK(result,
mbedtls_oid_get_md_alg(&md_alg, md_type)
);
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_NULL)
);
return result;
}
/*
* Parses and splits an ASN.1 "SEQUENCE OF <tag>"
*/
int mbedtls_asn1_get_sequence_of( unsigned char **p,
const unsigned char *end,
mbedtls_asn1_sequence *cur,
int tag)
{
int ret;
size_t len;
mbedtls_asn1_buf *buf;
/* Get main sequence tag */
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( ret );
if( *p + len != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
buf = &(cur->buf);
buf->tag = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
return( ret );
buf->p = *p;
*p += buf->len;
/* Allocate and assign next pointer */
if( *p < end )
{
cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
sizeof( mbedtls_asn1_sequence ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
cur = cur->next;
}
}
/* Set final sequence entry's next pointer to NULL */
cur->next = NULL;
if( *p != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* An ASN.1 encoded signature is a sequence of two ASN.1 integers. Parse one of
* those integers and convert it to the fixed-length encoding expected by PSA.
*/
static int extract_ecdsa_sig_int( unsigned char **from, const unsigned char *end,
unsigned char *to, size_t to_len )
{
int ret;
size_t unpadded_len, padding_len;
if( ( ret = mbedtls_asn1_get_tag( from, end, &unpadded_len,
MBEDTLS_ASN1_INTEGER ) ) != 0 )
{
return( ret );
}
while( unpadded_len > 0 && **from == 0x00 )
{
( *from )++;
unpadded_len--;
}
if( unpadded_len > to_len || unpadded_len == 0 )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
padding_len = to_len - unpadded_len;
memset( to, 0x00, padding_len );
memcpy( to + padding_len, *from, unpadded_len );
( *from ) += unpadded_len;
return( 0 );
}
int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
mbedtls_asn1_bitstring *bs)
{
int ret;
/* Certificate type is a single byte bitstring */
if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
return( ret );
/* Check length, subtract one for actual bit string length */
if( bs->len < 1 )
return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bs->len -= 1;
/* Get number of unused bits, ensure unused bits <= 7 */
bs->unused_bits = **p;
if( bs->unused_bits > 7 )
return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
(*p)++;
/* Get actual bitstring */
bs->p = *p;
*p += bs->len;
if( *p != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
*
* ECParameters ::= CHOICE {
* namedCurve OBJECT IDENTIFIER
* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
* -- implicitCurve NULL
* }
*/
static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
mbedtls_asn1_buf *params )
{
int ret;
/* Tag may be either OID or SEQUENCE */
params->tag = **p;
if( params->tag != MBEDTLS_ASN1_OID
#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
&& params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
#endif
)
{
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
}
if( ( ret = mbedtls_asn1_get_tag( p, end, ¶ms->len, params->tag ) ) != 0 )
{
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
}
params->p = *p;
*p += params->len;
if( *p != end )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER -- e
* }
*/
static int pk_get_rsapubkey( unsigned char **p,
const unsigned char *end,
mbedtls_rsa_context *rsa )
{
int ret;
size_t len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
if( *p + len != end )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
if( *p != end )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
rsa->len = mbedtls_mpi_size( &rsa->N );
return( 0 );
}
/*
* X.509 CRL v2 extensions (no extensions parsed yet.)
*/
static int x509_get_crl_ext( unsigned char **p,
const unsigned char *end,
mbedtls_x509_buf *ext )
{
int ret;
size_t len = 0;
/* Get explicit tag */
if( ( ret = mbedtls_x509_get_ext( p, end, ext, 0) ) != 0 )
{
if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
return( 0 );
return( ret );
}
while( *p < end )
{
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
*p += len;
}
if( *p != end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* HashAlgorithm ::= AlgorithmIdentifier
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*
* For HashAlgorithm, parameters MUST be NULL or absent.
*/
static int x509_get_hash_alg( const mbedtls_x509_buf *alg, mbedtls_md_type_t *md_alg )
{
int ret;
unsigned char *p;
const unsigned char *end;
mbedtls_x509_buf md_oid;
size_t len;
/* Make sure we got a SEQUENCE and setup bounds */
if( alg->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
return( MBEDTLS_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
p = (unsigned char *) alg->p;
end = p + alg->len;
if( p >= end )
return( MBEDTLS_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
/* Parse md_oid */
md_oid.tag = *p;
if( ( ret = mbedtls_asn1_get_tag( &p, end, &md_oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
md_oid.p = p;
p += md_oid.len;
/* Get md_alg from md_oid */
if( ( ret = mbedtls_oid_get_md_alg( &md_oid, md_alg ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
/* Make sure params is absent of NULL */
if( p == end )
return( 0 );
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_NULL ) ) != 0 || len != 0 )
return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
if( p != end )
return( MBEDTLS_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*/
int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
mbedtls_pk_context *pk )
{
int ret;
size_t len;
mbedtls_asn1_buf alg_params;
mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
const mbedtls_pk_info_t *pk_info;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
}
end = *p + len;
if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
return( ret );
if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
if( *p + len != end )
return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
return( ret );
#if defined(MBEDTLS_RSA_C)
if( pk_alg == MBEDTLS_PK_RSA )
{
ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
} else
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
{
ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
if( ret == 0 )
ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
} else
#endif /* MBEDTLS_ECP_C */
ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
if( ret == 0 && *p != end )
ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
if( ret != 0 )
mbedtls_pk_free( pk );
return( ret );
}
int mbedtls_ecies_read_envelope(unsigned char **p, const unsigned char *end,
size_t *len)
{
int result = 0;
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
);
return result;
}
/*
* Restartable read and check signature
*/
int mbedtls_ecdsa_read_signature_restartable( mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
const unsigned char *sig, size_t slen,
mbedtls_ecdsa_restart_ctx *rs_ctx )
{
int ret;
unsigned char *p = (unsigned char *) sig;
const unsigned char *end = sig + slen;
size_t len;
mbedtls_mpi r, s;
mbedtls_mpi_init( &r );
mbedtls_mpi_init( &s );
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( p + len != end )
{
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
goto cleanup;
}
if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
{
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
#if defined(MBEDTLS_ECDSA_VERIFY_ALT)
if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen,
&ctx->Q, &r, &s ) ) != 0 )
goto cleanup;
#else
if( ( ret = ecdsa_verify_restartable( &ctx->grp, hash, hlen,
&ctx->Q, &r, &s, rs_ctx ) ) != 0 )
goto cleanup;
#endif /* MBEDTLS_ECDSA_VERIFY_ALT */
/* At this point we know that the buffer starts with a valid signature.
* Return 0 if the buffer just contains the signature, and a specific
* error code if the valid signature is followed by more data. */
if( p != end )
ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
cleanup:
mbedtls_mpi_free( &r );
mbedtls_mpi_free( &s );
return( ret );
}
static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params,
mbedtls_asn1_buf *salt, int *iterations,
int *keylen, mbedtls_md_type_t *md_type )
{
int ret;
mbedtls_asn1_buf prf_alg_oid;
unsigned char *p = params->p;
const unsigned char *end = params->p + params->len;
if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
/*
* PBKDF2-params ::= SEQUENCE {
* salt OCTET STRING,
* iterationCount INTEGER,
* keyLength INTEGER OPTIONAL
* prf AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
* }
*
*/
if( ( ret = mbedtls_asn1_get_tag( &p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
salt->p = p;
p += salt->len;
if( ( ret = mbedtls_asn1_get_int( &p, end, iterations ) ) != 0 )
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
if( p == end )
return( 0 );
if( ( ret = mbedtls_asn1_get_int( &p, end, keylen ) ) != 0 )
{
if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
}
if( p == end )
return( 0 );
if( ( ret = mbedtls_asn1_get_alg_null( &p, end, &prf_alg_oid ) ) != 0 )
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
if( MBEDTLS_OID_CMP( MBEDTLS_OID_HMAC_SHA1, &prf_alg_oid ) != 0 )
return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
*md_type = MBEDTLS_MD_SHA1;
if( p != end )
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
int mbedtls_asn1_get_alg( unsigned char **p,
const unsigned char *end,
mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
{
int ret;
size_t len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( ret );
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
alg->tag = **p;
end = *p + len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
return( ret );
alg->p = *p;
*p += alg->len;
if( *p == end )
{
mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
return( 0 );
}
params->tag = **p;
(*p)++;
if( ( ret = mbedtls_asn1_get_len( p, end, ¶ms->len ) ) != 0 )
return( ret );
params->p = *p;
*p += params->len;
if( *p != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
size_t determine_der_length(const uint8_t* key, size_t max_len)
{
size_t len;
const uint8_t* end = key+max_len;
const uint8_t* p = key;
if (mbedtls_asn1_get_tag( (uint8_t**)&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
return 0;
}
return p-key+len;
}
/*
* Name ::= CHOICE { -- only one possibility for now --
* rdnSequence RDNSequence }
*
* RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
*
* RelativeDistinguishedName ::=
* SET OF AttributeTypeAndValue
*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,
* value AttributeValue }
*
* AttributeType ::= OBJECT IDENTIFIER
*
* AttributeValue ::= ANY DEFINED BY AttributeType
*
* The data structure is optimized for the common case where each RDN has only
* one element, which is represented as a list of AttributeTypeAndValue.
* For the general case we still use a flat list, but we mark elements of the
* same set so that they are "merged" together in the functions that consume
* this list, eg mbedtls_x509_dn_gets().
*/
int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
mbedtls_x509_name *cur )
{
int ret;
size_t set_len;
const unsigned char *end_set;
/* don't use recursion, we'd risk stack overflow if not optimized */
while( 1 )
{
/*
* parse SET
*/
if( ( ret = mbedtls_asn1_get_tag( p, end, &set_len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SET ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
end_set = *p + set_len;
while( 1 )
{
if( ( ret = x509_get_attr_type_value( p, end_set, cur ) ) != 0 )
return( ret );
if( *p == end_set )
break;
/* Mark this item as being no the only one in a set */
cur->next_merged = 1;
cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_X509_ALLOC_FAILED );
cur = cur->next;
}
/*
* continue until end of SEQUENCE is reached
*/
if( *p == end )
return( 0 );
cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_X509_ALLOC_FAILED );
cur = cur->next;
}
}
/*
* Get a bit string without unused bits
*/
int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
size_t *len )
{
int ret;
if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
return( ret );
if( (*len)-- < 2 || *(*p)++ != 0 )
return( MBEDTLS_ERR_ASN1_INVALID_DATA );
return( 0 );
}
int mbedtls_ecies_read_content_info(unsigned char **p, const unsigned char *end,
mbedtls_cipher_type_t *cipher_type, unsigned char **iv, size_t *iv_len,
unsigned char **data, size_t *data_len)
{
int result = 0;
size_t len = 0;
mbedtls_asn1_buf cipher_alg;
mbedtls_asn1_buf cipher_params;
if (cipher_type == NULL || iv == NULL || iv_len == NULL || data == NULL || data_len == NULL)
{
return MBEDTLS_ERR_ECIES_BAD_INPUT_DATA;
}
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
);
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_alg(p, end, &cipher_alg, &cipher_params)
);
if (cipher_params.tag != MBEDTLS_ASN1_OCTET_STRING)
{
INVOKE_AND_CHECK(result, MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
*iv = cipher_params.p;
*iv_len = cipher_params.len;
INVOKE_AND_CHECK(result,
mbedtls_oid_get_cipher_alg(&cipher_alg, cipher_type)
);
INVOKE_AND_CHECK(result,
mbedtls_asn1_get_tag(p, end, data_len, MBEDTLS_ASN1_OCTET_STRING)
);
*data = *p;
*p += *data_len;
return result;
}
/*
* X.509 Extensions (No parsing of extensions, pointer should
* be either manually updated or extensions should be parsed!)
*/
int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *ext, int tag )
{
int ret;
size_t len;
if( *p == end )
return( 0 );
ext->tag = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag ) ) != 0 )
return( ret );
ext->p = *p;
end = *p + ext->len;
/*
* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING }
*/
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
if( end != *p + len )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
int mbedtls_asn1_get_mpi( unsigned char **p,
const unsigned char *end,
mbedtls_mpi *X )
{
int ret;
size_t len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
return( ret );
ret = mbedtls_mpi_read_binary( X, *p, len );
*p += len;
return( ret );
}
/*
* Read and check signature
*/
int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
const unsigned char *sig, size_t slen )
{
int ret;
unsigned char *p = (unsigned char *) sig;
const unsigned char *end = sig + slen;
size_t len;
mbedtls_mpi r, s;
mbedtls_mpi_init( &r );
mbedtls_mpi_init( &s );
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( p + len != end )
{
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
goto cleanup;
}
if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
{
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen,
&ctx->Q, &r, &s ) ) != 0 )
goto cleanup;
if( p != end )
ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
cleanup:
mbedtls_mpi_free( &r );
mbedtls_mpi_free( &s );
return( ret );
}
/*
* Parse the public key used for signing.
*/
static int
bootutil_parse_eckey(mbedtls_ecdsa_context *ctx, uint8_t **p, uint8_t *end)
{
size_t len;
mbedtls_asn1_buf alg;
mbedtls_asn1_buf param;
if (mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
return -1;
}
end = *p + len;
if (mbedtls_asn1_get_alg(p, end, &alg, ¶m)) {
return -2;
}
if (alg.len != sizeof(ec_pubkey_oid) - 1 ||
memcmp(alg.p, ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
return -3;
}
if (param.len != sizeof(ec_secp224r1_oid) - 1||
memcmp(param.p, ec_secp224r1_oid, sizeof(ec_secp224r1_oid) - 1)) {
return -4;
}
if (mbedtls_ecp_group_load_secp224r1(&ctx->grp)) {
return -5;
}
if (mbedtls_asn1_get_bitstring_null(p, end, &len)) {
return -6;
}
if (*p + len != end) {
return -7;
}
if (mbedtls_ecp_point_read_binary(&ctx->grp, &ctx->Q, *p, end - *p)) {
return -8;
}
if (mbedtls_ecp_check_pubkey(&ctx->grp, &ctx->Q)) {
return -9;
}
return 0;
}
int mbedtls_asn1_get_bool( unsigned char **p,
const unsigned char *end,
int *val )
{
int ret;
size_t len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
return( ret );
if( len != 1 )
return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
*val = ( **p != 0 ) ? 1 : 0;
(*p)++;
return( 0 );
}
/*
* Convert a signature from an ASN.1 sequence of two integers
* to a raw {r,s} buffer. Note: the provided sig buffer must be at least
* twice as big as int_size.
*/
static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end,
unsigned char *sig, size_t int_size )
{
int ret;
size_t tmp_size;
if( ( ret = mbedtls_asn1_get_tag( p, end, &tmp_size,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( ret );
/* Extract r */
if( ( ret = extract_ecdsa_sig_int( p, end, sig, int_size ) ) != 0 )
return( ret );
/* Extract s */
if( ( ret = extract_ecdsa_sig_int( p, end, sig + int_size, int_size ) ) != 0 )
return( ret );
return( 0 );
}
int mbedtls_asn1_get_int( unsigned char **p,
const unsigned char *end,
int *val )
{
int ret;
size_t len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
return( ret );
if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
*val = 0;
while( len-- > 0 )
{
*val = ( *val << 8 ) | **p;
(*p)++;
}
return( 0 );
}
static int pk_parse_key_pkcs8_encrypted_der(
mbedtls_pk_context *pk,
const unsigned char *key, size_t keylen,
const unsigned char *pwd, size_t pwdlen )
{
int ret, decrypted = 0;
size_t len;
unsigned char buf[2048];
unsigned char *p, *end;
mbedtls_asn1_buf pbe_alg_oid, pbe_params;
#if defined(MBEDTLS_PKCS12_C)
mbedtls_cipher_type_t cipher_alg;
mbedtls_md_type_t md_alg;
#endif
memset( buf, 0, sizeof( buf ) );
p = (unsigned char *) key;
end = p + keylen;
if( pwdlen == 0 )
return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
/*
* This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
*
* EncryptedPrivateKeyInfo ::= SEQUENCE {
* encryptionAlgorithm EncryptionAlgorithmIdentifier,
* encryptedData EncryptedData
* }
*
* EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
*
* EncryptedData ::= OCTET STRING
*
* The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
*/
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
}
end = p + len;
if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
if( len > sizeof( buf ) )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
/*
* Decrypt EncryptedData with appropriate PDE
*/
#if defined(MBEDTLS_PKCS12_C)
if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
{
if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
cipher_alg, md_alg,
pwd, pwdlen, p, len, buf ) ) != 0 )
{
if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
return( ret );
}
decrypted = 1;
}
else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
{
if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
MBEDTLS_PKCS12_PBE_DECRYPT,
pwd, pwdlen,
p, len, buf ) ) != 0 )
{
return( ret );
}
// Best guess for password mismatch when using RC4. If first tag is
// not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
//
if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
decrypted = 1;
}
else
#endif /* MBEDTLS_PKCS12_C */
#if defined(MBEDTLS_PKCS5_C)
if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
{
if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
p, len, buf ) ) != 0 )
{
if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
return( ret );
}
decrypted = 1;
}
else
#endif /* MBEDTLS_PKCS5_C */
{
((void) pwd);
}
if( decrypted == 0 )
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
}
/*
* Parse an unencrypted PKCS#8 encoded private key
*/
static int pk_parse_key_pkcs8_unencrypted_der(
mbedtls_pk_context *pk,
const unsigned char* key,
size_t keylen )
{
int ret, version;
size_t len;
mbedtls_asn1_buf params;
unsigned char *p = (unsigned char *) key;
unsigned char *end = p + keylen;
mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
const mbedtls_pk_info_t *pk_info;
/*
* This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
*
* PrivateKeyInfo ::= SEQUENCE {
* version Version,
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
* privateKey PrivateKey,
* attributes [0] IMPLICIT Attributes OPTIONAL }
*
* Version ::= INTEGER
* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
* PrivateKey ::= OCTET STRING
*
* The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
*/
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
}
end = p + len;
if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
if( version != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, ¶ms ) ) != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
if( len < 1 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
return( ret );
#if defined(MBEDTLS_RSA_C)
if( pk_alg == MBEDTLS_PK_RSA )
{
if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
{
mbedtls_pk_free( pk );
return( ret );
}
} else
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
{
if( ( ret = pk_use_ecparams( ¶ms, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
{
mbedtls_pk_free( pk );
return( ret );
}
} else
#endif /* MBEDTLS_ECP_C */
return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
return( 0 );
}
