/*
* Check if contexts holding a public and private key match
*/
int shrsa_check_pub_priv( const shrsa_context *pub, const shrsa_context *prv )
{
if( shrsa_check_pubkey( pub ) != 0 ||
shrsa_check_privkey( prv ) != 0 )
{
return( RSA_ERR_RSA_KEY_CHECK_FAILED );
}
if( shmpi_cmp_shmpi( &pub->N, &prv->N ) != 0 ||
shmpi_cmp_shmpi( &pub->E, &prv->E ) != 0 )
{
return( RSA_ERR_RSA_KEY_CHECK_FAILED );
}
return( 0 );
}
/*
* Parse a PKCS#1 encoded private RSA key
*/
static int pk_parse_key_pkcs1_der( shrsa_t *shrsa,
const unsigned char *key,
size_t keylen )
{
int ret;
size_t len;
unsigned char *p, *end;
p = (unsigned char *) key;
end = p + keylen;
/*
* This function parses the RSAPrivateKey (PKCS#1)
*
* RSAPrivateKey ::= SEQUENCE {
* version Version,
* modulus INTEGER, -- n
* publicExponent INTEGER, -- e
* privateExponent INTEGER, -- d
* prime1 INTEGER, -- p
* prime2 INTEGER, -- q
* exponent1 INTEGER, -- d mod (p-1)
* exponent2 INTEGER, -- d mod (q-1)
* coefficient INTEGER, -- (inverse of q) mod p
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
}
end = p + len;
if( ( ret = asn1_get_int( &p, end, &shrsa->ver ) ) != 0 )
{
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
}
if( shrsa->ver != 0 )
{
return( POLARSSL_ERR_PK_KEY_INVALID_VERSION );
}
if( ( ret = asn1_get_shmpi( &p, end, &shrsa->N ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->E ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->D ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->P ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->Q ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->DP ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->DQ ) ) != 0 ||
( ret = asn1_get_shmpi( &p, end, &shrsa->QP ) ) != 0 )
{
shrsa_free( shrsa );
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
}
shrsa->len = shmpi_size( &shrsa->N );
if( p != end )
{
shrsa_free( shrsa );
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
if( ( ret = shrsa_check_privkey( shrsa ) ) != 0 )
{
shrsa_free( shrsa );
return( ret );
}
return( 0 );
}
