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Introduce generic x509_get_pubkey()

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Manuel Pégourié-Gonnard 2013-07-09 12:54:04 +02:00 committed by Paul Bakker
parent 094ad9e512
commit c296c5925e
1 changed files with 78 additions and 0 deletions
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78
library/x509parse.c
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@ -571,6 +571,84 @@ static int x509_get_rsapubkey( unsigned char **p,
return( 0 );
}
static int x509_get_ecpubkey( unsigned char **p, const unsigned char *end,
x509_buf *alg_params, ecp_keypair *key )
{
int ret;
ecp_group_id grp_id;
if( ( ret = x509_ecparams_get_grp_id( alg_params, &grp_id ) ) != 0 )
return( ret );
if( ( ret = ecp_use_known_dp( &key->grp, grp_id ) ) != 0 )
return( ret );
if( ( ret = ecp_point_read_binary( &key->grp, &key->Q,
(const unsigned char *) *p, end - *p ) ) != 0 )
{
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
return( 0 );
}
/*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*/
static int x509_get_pubkey( unsigned char **p,
const unsigned char *end,
pk_context *pk )
{
int ret;
size_t len;
x509_buf alg_params;
pk_type_t pk_alg = POLARSSL_PK_NONE;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
end = *p + len;
if( ( ret = x509_get_algid( p, end, &pk_alg, &alg_params ) ) != 0 )
return( ret );
if( ( ret = asn1_get_tag( p, end, &len, ASN1_BIT_STRING ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret );
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
if( *p + len != end )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( *(*p)++ != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY );
pk_set_type( pk, pk_alg );
switch( pk_alg )
{
case POLARSSL_PK_NONE:
return( POLARSSL_ERR_X509_UNKNOWN_PK_ALG );
case POLARSSL_PK_RSA:
return( x509_get_rsapubkey( p, end, pk->data ) );
case POLARSSL_PK_ECKEY_DH:
((ecp_keypair *) pk->data)->alg = POLARSSL_ECP_KEY_ALG_ECDH;
/* FALLTHROUGH */
case POLARSSL_PK_ECKEY:
return( x509_get_ecpubkey( p, end, &alg_params, pk->data ) );
}
}
/*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,