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Start parsing RSASSA-PSS parameters

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This commit is contained in:
Manuel Pégourié-Gonnard
2014-01-23 16:24:44 +01:00
parent b1d4eb16e4
commit d9fd87be33
4 changed files with 120 additions and 1 deletions
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86
library/x509.c
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@@ -132,6 +132,92 @@ int x509_get_alg( unsigned char **p, const unsigned char *end,
return( 0 );
}
/*
* RSASSA-PSS-params ::= SEQUENCE {
* hashAlgorithm [0] HashAlgorithm DEFAULT sha1Identifier,
* maskGenAlgorithm [1] MaskGenAlgorithm DEFAULT mgf1SHA1Identifier,
* saltLength [2] INTEGER DEFAULT 20,
* trailerField [3] INTEGER DEFAULT 1 }
* -- Note that the tags in this Sequence are explicit.
*/
int x509_get_rsassa_pss_params( const x509_buf *params,
md_type_t *md_alg,
int *salt_len,
int *trailer_field )
{
int ret;
unsigned char *p;
const unsigned char *end;
size_t len;
x509_buf alg_id;
/* First set everything to defaults */
*md_alg = POLARSSL_MD_SHA1;
*salt_len = 20;
*trailer_field = 1;
/* Make sure params is a SEQUENCE and setup bounds */
if( params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
return( POLARSSL_ERR_X509_INVALID_ALG +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
p = (unsigned char *) params->p;
end = p + params->len;
if( p == end )
return( 0 );
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) == 0 )
{
/* HashAlgorithm ::= AlgorithmIdentifier (without parameters) */
// TODO: WIP
}
else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( POLARSSL_ERR_X509_INVALID_ALG + ret );
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) ) == 0 )
{
/* MaskGenAlgorithm ::= AlgorithmIdentifier */
// TODO: WIP
}
else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( POLARSSL_ERR_X509_INVALID_ALG + ret );
if( p == end )
return( 0 );
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 2 ) ) == 0 )
{
/* salt_len */
if( ( ret = asn1_get_int( &p, p + len, salt_len ) ) != 0 )
return( POLARSSL_ERR_X509_INVALID_ALG + ret );
}
else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( POLARSSL_ERR_X509_INVALID_ALG + ret );
if( p == end )
return( 0 );
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 3 ) ) == 0 )
{
/* trailer_field */
if( ( ret = asn1_get_int( &p, p + len, trailer_field ) ) != 0 )
return( POLARSSL_ERR_X509_INVALID_ALG + ret );
}
else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( POLARSSL_ERR_X509_INVALID_ALG + ret );
if( p != end )
return( POLARSSL_ERR_X509_INVALID_ALG +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,