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Start parsing RSASSA-PSS parameters

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Manuel Pégourié-Gonnard 2014-01-23 16:24:44 +01:00
parent 59a75d5b9d
commit f346bab139
4 changed files with 120 additions and 1 deletions
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2
include/polarssl/x509.h
View file

@ -278,6 +278,8 @@ int x509_get_alg_null( unsigned char **p, const unsigned char *end,
x509_buf *alg );
int x509_get_alg( unsigned char **p, const unsigned char *end,
x509_buf *alg, x509_buf *params );
int x509_get_rsassa_pss_params( const x509_buf *params, md_type_t *md_alg,
int *salt_len, int *trailer_field );
int x509_get_sig( unsigned char **p, const unsigned char *end, x509_buf *sig );
int x509_get_sig_alg( const x509_buf *sig_oid, md_type_t *md_alg,
pk_type_t *pk_alg );

86
library/x509.c
View file

@ -137,6 +137,92 @@ 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,

31
library/x509_crt.c
View file

@ -622,6 +622,22 @@ static int x509_crt_parse_der_core( x509_crt *crt, const unsigned char *buf,
return( ret );
}
if( crt->sig_pk == POLARSSL_PK_RSASSA_PSS )
{
int salt_len, trailer_field;
if( ( ret = x509_get_rsassa_pss_params( &crt->sig_params,
&crt->sig_md, &salt_len, &trailer_field ) ) != 0 )
return( ret );
}
else
{
/* Make sure parameters were absent or NULL */
if( ( crt->sig_params.tag != ASN1_NULL && crt->sig_params.tag != 0 ) ||
crt->sig_params.len != 0 )
return( POLARSSL_ERR_X509_INVALID_ALG );
}
/*
* issuer Name
*/
@ -1300,6 +1316,21 @@ int x509_crt_info( char *buf, size_t size, const char *prefix,
ret = snprintf( p, n, "%s", desc );
SAFE_SNPRINTF();
if( crt->sig_pk == POLARSSL_PK_RSASSA_PSS )
{
md_type_t md_alg;
int salt_len, trailer_field;
if( ( ret = x509_get_rsassa_pss_params( &crt->sig_params,
&md_alg, &salt_len, &trailer_field ) ) != 0 )
return( ret );
// TODO: SHA1 harcoded twice (WIP)
ret = snprintf( p, n, " (SHA1, MGF1-SHA1, %d, %d)",
salt_len, trailer_field );
SAFE_SNPRINTF();
}
/* Key size */
if( ( ret = x509_key_size_helper( key_size_str, BEFORE_COLON,
pk_get_name( &crt->pk ) ) ) != 0 )

2
tests/suites/test_suite_x509parse.data
View file

@ -44,7 +44,7 @@ x509_cert_info:"data_files/cert_sha512.crt":"cert. version \: 3\nserial numb
X509 Certificate information RSA-PSS, SHA1 Digest
depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_RSA_C
x509_cert_info:"data_files/server9.crt":"cert. version \: 3\nserial number \: 16\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=localhost\nissued on \: 2014-01-20 13\:38\:16\nexpires on \: 2024-01-18 13\:38\:16\nsigned using \: RSASSA-PSS\nRSA key size \: 1024 bits\n"
x509_cert_info:"data_files/server9.crt":"cert. version \: 3\nserial number \: 16\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=localhost\nissued on \: 2014-01-20 13\:38\:16\nexpires on \: 2024-01-18 13\:38\:16\nsigned using \: RSASSA-PSS (SHA1, MGF1-SHA1, 234, 1)\nRSA key size \: 1024 bits\n"
X509 Certificate information EC, SHA1 Digest
depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_ECP_C:POLARSSL_ECP_DP_SECP256R1_ENABLED