SilcBool silc_pkcs1_verify_no_oid(void *public_key,
unsigned char *signature,
SilcUInt32 signature_len,
unsigned char *data,
SilcUInt32 data_len,
SilcHash hash)
{
RsaPublicKey *key = public_key;
SilcBool ret = FALSE;
SilcMPInt mp_tmp2;
SilcMPInt mp_dst;
unsigned char *verify, unpadded[2048 + 1], hashr[SILC_HASH_MAXLEN];
SilcUInt32 verify_len, len = (key->bits + 7) / 8;
SILC_LOG_DEBUG(("Verify signature"));
silc_mp_init(&mp_tmp2);
silc_mp_init(&mp_dst);
/* Format the signature into MP int */
silc_mp_bin2mp(signature, signature_len, &mp_tmp2);
/* Verify */
silc_rsa_public_operation(key, &mp_tmp2, &mp_dst);
/* MP to data */
verify = silc_mp_mp2bin(&mp_dst, len, &verify_len);
/* Unpad data */
if (!silc_pkcs1_decode(SILC_PKCS1_BT_PRV1, verify, verify_len,
unpadded, sizeof(unpadded), &len)) {
memset(verify, 0, verify_len);
silc_free(verify);
silc_mp_uninit(&mp_tmp2);
silc_mp_uninit(&mp_dst);
return FALSE;
}
/* Hash data if requested */
if (hash) {
silc_hash_make(hash, data, data_len, hashr);
data = hashr;
data_len = silc_hash_len(hash);
}
/* Compare */
if (len == data_len && !memcmp(data, unpadded, len))
ret = TRUE;
memset(verify, 0, verify_len);
memset(unpadded, 0, sizeof(unpadded));
silc_free(verify);
silc_mp_uninit(&mp_tmp2);
silc_mp_uninit(&mp_dst);
if (hash)
memset(hashr, 0, sizeof(hashr));
return ret;
}
SilcBool silc_pkcs1_sign_no_oid(void *private_key,
unsigned char *src,
SilcUInt32 src_len,
unsigned char *signature,
SilcUInt32 signature_size,
SilcUInt32 *ret_signature_len,
SilcBool compute_hash,
SilcHash hash)
{
RsaPrivateKey *key = private_key;
SilcMPInt mp_tmp;
SilcMPInt mp_dst;
unsigned char padded[2048 + 1], hashr[SILC_HASH_MAXLEN];
SilcUInt32 len = (key->bits + 7) / 8;
SILC_LOG_DEBUG(("Sign"));
if (sizeof(padded) < len)
return FALSE;
if (signature_size < len)
return FALSE;
/* Compute hash if requested */
if (compute_hash) {
silc_hash_make(hash, src, src_len, hashr);
src = hashr;
src_len = silc_hash_len(hash);
}
/* Pad data */
if (!silc_pkcs1_encode(SILC_PKCS1_BT_PRV1, src, src_len,
padded, len, NULL))
return FALSE;
silc_mp_init(&mp_tmp);
silc_mp_init(&mp_dst);
/* Data to MP */
silc_mp_bin2mp(padded, len, &mp_tmp);
/* Sign */
silc_rsa_private_operation(key, &mp_tmp, &mp_dst);
/* MP to data */
silc_mp_mp2bin_noalloc(&mp_dst, signature, len);
*ret_signature_len = len;
memset(padded, 0, sizeof(padded));
silc_mp_uninit(&mp_tmp);
silc_mp_uninit(&mp_dst);
if (compute_hash)
memset(hashr, 0, sizeof(hashr));
return TRUE;
}
SilcBool silc_pkcs1_decrypt(void *private_key,
unsigned char *src,
SilcUInt32 src_len,
unsigned char *dst,
SilcUInt32 dst_size,
SilcUInt32 *ret_dst_len)
{
RsaPrivateKey *key = private_key;
SilcMPInt mp_tmp;
SilcMPInt mp_dst;
unsigned char *padded, unpadded[2048 + 1];
SilcUInt32 padded_len;
if (dst_size < (key->bits + 7) / 8)
return FALSE;
silc_mp_init(&mp_tmp);
silc_mp_init(&mp_dst);
/* Data to MP */
silc_mp_bin2mp(src, src_len, &mp_tmp);
/* Decrypt */
silc_rsa_private_operation(key, &mp_tmp, &mp_dst);
/* MP to data */
padded = silc_mp_mp2bin(&mp_dst, (key->bits + 7) / 8, &padded_len);
/* Unpad data */
if (!silc_pkcs1_decode(SILC_PKCS1_BT_PUB, padded, padded_len,
unpadded, sizeof(unpadded), ret_dst_len)) {
memset(padded, 0, padded_len);
silc_free(padded);
silc_mp_uninit(&mp_tmp);
silc_mp_uninit(&mp_dst);
return FALSE;
}
/* Copy to destination */
memcpy(dst, unpadded, *ret_dst_len);
memset(padded, 0, padded_len);
memset(unpadded, 0, sizeof(unpadded));
silc_free(padded);
silc_mp_uninit(&mp_tmp);
silc_mp_uninit(&mp_dst);
return TRUE;
}
int silc_mp_unformat(SilcStack stack, SilcBuffer buffer,
void **value, void *context)
{
SilcMPInt *mp = *value;
unsigned char *m;
SilcUInt32 m_len;
int ret;
ret = silc_buffer_sunformat(stack, buffer,
SILC_STR_UI32_NSTRING(&m, &m_len),
SILC_STR_END);
if (ret < 0)
return ret;
silc_mp_bin2mp(m, m_len, mp);
return ret;
}
SilcBool silc_pkcs1_encrypt(void *public_key,
unsigned char *src,
SilcUInt32 src_len,
unsigned char *dst,
SilcUInt32 dst_size,
SilcUInt32 *ret_dst_len,
SilcRng rng)
{
RsaPublicKey *key = public_key;
SilcMPInt mp_tmp;
SilcMPInt mp_dst;
unsigned char padded[2048 + 1];
SilcUInt32 len = (key->bits + 7) / 8;
if (sizeof(padded) < len)
return FALSE;
if (dst_size < len)
return FALSE;
/* Pad data */
if (!silc_pkcs1_encode(SILC_PKCS1_BT_PUB, src, src_len,
padded, len, rng))
return FALSE;
silc_mp_init(&mp_tmp);
silc_mp_init(&mp_dst);
/* Data to MP */
silc_mp_bin2mp(padded, len, &mp_tmp);
/* Encrypt */
silc_rsa_public_operation(key, &mp_tmp, &mp_dst);
/* MP to data */
silc_mp_mp2bin_noalloc(&mp_dst, dst, len);
*ret_dst_len = len;
memset(padded, 0, sizeof(padded));
silc_mp_uninit(&mp_tmp);
silc_mp_uninit(&mp_dst);
return TRUE;
}
SilcBool silc_pkcs1_verify(void *public_key,
unsigned char *signature,
SilcUInt32 signature_len,
unsigned char *data,
SilcUInt32 data_len,
SilcHash hash)
{
RsaPublicKey *key = public_key;
SilcBool ret = FALSE;
SilcMPInt mp_tmp2;
SilcMPInt mp_dst;
unsigned char *verify, unpadded[2048 + 1], hashr[SILC_HASH_MAXLEN];
SilcUInt32 verify_len, len = (key->bits + 7) / 8;
SilcBufferStruct di, ldi;
SilcHash ihash = NULL;
SilcAsn1 asn1 = NULL;
char *oid;
SILC_LOG_DEBUG(("Verify signature"));
asn1 = silc_asn1_alloc();
if (!asn1)
return FALSE;
silc_mp_init(&mp_tmp2);
silc_mp_init(&mp_dst);
/* Format the signature into MP int */
silc_mp_bin2mp(signature, signature_len, &mp_tmp2);
/* Verify */
silc_rsa_public_operation(key, &mp_tmp2, &mp_dst);
/* MP to data */
verify = silc_mp_mp2bin(&mp_dst, len, &verify_len);
/* Unpad data */
if (!silc_pkcs1_decode(SILC_PKCS1_BT_PRV1, verify, verify_len,
unpadded, sizeof(unpadded), &len))
goto err;
silc_buffer_set(&di, unpadded, len);
/* If hash isn't given, allocate the one given in digest info */
if (!hash) {
/* Decode digest info */
if (!silc_asn1_decode(asn1, &di,
SILC_ASN1_OPTS(SILC_ASN1_ACCUMUL),
SILC_ASN1_SEQUENCE,
SILC_ASN1_SEQUENCE,
SILC_ASN1_OID(&oid),
SILC_ASN1_END,
SILC_ASN1_END, SILC_ASN1_END))
goto err;
if (!silc_hash_alloc_by_oid(oid, &ihash)) {
SILC_LOG_DEBUG(("Unknown OID %s", oid));
goto err;
}
hash = ihash;
}
/* Hash the data */
silc_hash_make(hash, data, data_len, hashr);
data = hashr;
data_len = silc_hash_len(hash);
oid = (char *)silc_hash_get_oid(hash);
/* Encode digest info for comparison */
memset(&ldi, 0, sizeof(ldi));
if (!silc_asn1_encode(asn1, &ldi,
SILC_ASN1_OPTS(SILC_ASN1_ACCUMUL),
SILC_ASN1_SEQUENCE,
SILC_ASN1_SEQUENCE,
SILC_ASN1_OID(oid),
SILC_ASN1_NULL,
SILC_ASN1_END,
SILC_ASN1_OCTET_STRING(data, data_len),
SILC_ASN1_END, SILC_ASN1_END))
goto err;
SILC_LOG_HEXDUMP(("DigestInfo remote"), silc_buffer_data(&di),
silc_buffer_len(&di));
SILC_LOG_HEXDUMP(("DigestInfo local"), silc_buffer_data(&ldi),
silc_buffer_len(&ldi));
/* Compare */
if (silc_buffer_len(&di) == silc_buffer_len(&ldi) &&
!memcmp(silc_buffer_data(&di), silc_buffer_data(&ldi),
silc_buffer_len(&ldi)))
ret = TRUE;
memset(verify, 0, verify_len);
memset(unpadded, 0, sizeof(unpadded));
silc_free(verify);
silc_mp_uninit(&mp_tmp2);
silc_mp_uninit(&mp_dst);
if (hash)
memset(hashr, 0, sizeof(hashr));
if (ihash)
silc_hash_free(ihash);
silc_asn1_free(asn1);
return ret;
err:
memset(verify, 0, verify_len);
silc_free(verify);
silc_mp_uninit(&mp_tmp2);
silc_mp_uninit(&mp_dst);
if (ihash)
silc_hash_free(ihash);
silc_asn1_free(asn1);
return FALSE;
}
SilcBool silc_pkcs1_sign(void *private_key,
unsigned char *src,
SilcUInt32 src_len,
unsigned char *signature,
SilcUInt32 signature_size,
SilcUInt32 *ret_signature_len,
SilcBool compute_hash,
SilcHash hash)
{
RsaPrivateKey *key = private_key;
unsigned char padded[2048 + 1], hashr[SILC_HASH_MAXLEN];
SilcMPInt mp_tmp;
SilcMPInt mp_dst;
SilcBufferStruct di;
SilcUInt32 len = (key->bits + 7) / 8;
const char *oid;
SilcAsn1 asn1;
SILC_LOG_DEBUG(("Sign"));
if (sizeof(padded) < len)
return FALSE;
if (signature_size < len)
return FALSE;
oid = silc_hash_get_oid(hash);
if (!oid)
return FALSE;
asn1 = silc_asn1_alloc();
if (!asn1)
return FALSE;
/* Compute hash */
if (compute_hash) {
silc_hash_make(hash, src, src_len, hashr);
src = hashr;
src_len = silc_hash_len(hash);
}
/* Encode digest info */
memset(&di, 0, sizeof(di));
if (!silc_asn1_encode(asn1, &di,
SILC_ASN1_SEQUENCE,
SILC_ASN1_SEQUENCE,
SILC_ASN1_OID(oid),
SILC_ASN1_NULL,
SILC_ASN1_END,
SILC_ASN1_OCTET_STRING(src, src_len),
SILC_ASN1_END, SILC_ASN1_END)) {
silc_asn1_free(asn1);
return FALSE;
}
SILC_LOG_HEXDUMP(("DigestInfo"), silc_buffer_data(&di),
silc_buffer_len(&di));
/* Pad data */
if (!silc_pkcs1_encode(SILC_PKCS1_BT_PRV1, silc_buffer_data(&di),
silc_buffer_len(&di), padded, len, NULL)) {
silc_asn1_free(asn1);
return FALSE;
}
silc_mp_init(&mp_tmp);
silc_mp_init(&mp_dst);
/* Data to MP */
silc_mp_bin2mp(padded, len, &mp_tmp);
/* Sign */
silc_rsa_private_operation(key, &mp_tmp, &mp_dst);
/* MP to data */
silc_mp_mp2bin_noalloc(&mp_dst, signature, len);
*ret_signature_len = len;
memset(padded, 0, sizeof(padded));
silc_mp_uninit(&mp_tmp);
silc_mp_uninit(&mp_dst);
if (compute_hash)
memset(hashr, 0, sizeof(hashr));
silc_asn1_free(asn1);
return TRUE;
}
