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RSA: Use hashlen as the hash input size as documented

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Where hashlen was previously ignored when the hash length could be
inferred from an md_alg parameter, the two must now match.

Adapt the existing tests accordingly. Adapt the sample programs accordingly.

This commit does not add any negative testing.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-22 18:39:53 +02:00
parent 9dbbc297a3
commit 6e3187b212
9 changed files with 71 additions and 56 deletions
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20
library/rsa.c
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@ -1799,7 +1799,8 @@ static int rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx,
if( md_info == NULL )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
hashlen = mbedtls_md_get_size( md_info );
if( hashlen != mbedtls_md_get_size( md_info ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
}
md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
@ -1934,14 +1935,13 @@ int mbedtls_rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx,
* Parameters:
* - md_alg: Identifies the hash algorithm used to generate the given hash;
* MBEDTLS_MD_NONE if raw data is signed.
* - hashlen: Length of hash in case hashlen is MBEDTLS_MD_NONE.
* - hashlen: Length of hash. Must match md_alg if that's not NONE.
* - hash: Buffer containing the hashed message or the raw data.
* - dst_len: Length of the encoded message.
* - dst: Buffer to hold the encoded message.
*
* Assumptions:
* - hash has size hashlen if md_alg == MBEDTLS_MD_NONE.
* - hash has size corresponding to md_alg if md_alg != MBEDTLS_MD_NONE.
* - hash has size hashlen.
* - dst points to a buffer of size at least dst_len.
*
*/
@ -1966,7 +1966,8 @@ static int rsa_rsassa_pkcs1_v15_encode( mbedtls_md_type_t md_alg,
if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
hashlen = mbedtls_md_get_size( md_info );
if( hashlen != mbedtls_md_get_size( md_info ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
/* Double-check that 8 + hashlen + oid_size can be used as a
* 1-byte ASN.1 length encoding and that there's no overflow. */
@ -2031,6 +2032,8 @@ static int rsa_rsassa_pkcs1_v15_encode( mbedtls_md_type_t md_alg,
* TAG-NULL + LEN [ NULL ] ]
* TAG-OCTET + LEN [ HASH ] ]
*/
if( 0x08 + oid_size + hashlen >= 0x80 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
*p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
*p++ = (unsigned char)( 0x08 + oid_size + hashlen );
*p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
@ -2212,7 +2215,8 @@ int mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_rsa_context *ctx,
if( md_info == NULL )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
hashlen = mbedtls_md_get_size( md_info );
if( hashlen != mbedtls_md_get_size( md_info ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
}
md_info = mbedtls_md_info_from_type( mgf1_hash_id );
@ -2683,7 +2687,7 @@ int mbedtls_rsa_self_test( int verbose )
}
if( mbedtls_rsa_pkcs1_sign( &rsa, myrand, NULL,
MBEDTLS_MD_SHA1, 0,
MBEDTLS_MD_SHA1, 20,
sha1sum, rsa_ciphertext ) != 0 )
{
if( verbose != 0 )
@ -2696,7 +2700,7 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "passed\n PKCS#1 sig. verify: " );
if( mbedtls_rsa_pkcs1_verify( &rsa, MBEDTLS_MD_SHA1, 0,
if( mbedtls_rsa_pkcs1_verify( &rsa, MBEDTLS_MD_SHA1, 20,
sha1sum, rsa_ciphertext ) != 0 )
{
if( verbose != 0 )