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Merge pull request #4718 from nick-child-ibm/hash_len_devel

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Backport 2.x: pk.c: Ensure min hash_len in pk_hashlen_helper
This commit is contained in:
Gilles Peskine 2021-06-29 18:16:51 +02:00 committed by GitHub
commit bdba86f4d5
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 32 additions and 19 deletions
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5
ChangeLog.d/ensure_hash_len_is_valid.txt Normal file
View File

@ -0,0 +1,5 @@
Bugfix
* mbedtls_pk_sign() and mbedtls_pk_verify() and their extended and
restartable variants now always honor the specified hash length if
nonzero. Before, for RSA, hash_len was ignored in favor of the length of
the specified hash algorithm.

5
library/pk.c
View File

@ -235,12 +235,15 @@ static inline int pk_hashlen_helper( mbedtls_md_type_t md_alg, size_t *hash_len
{
const mbedtls_md_info_t *md_info;
if( *hash_len != 0 )
if( *hash_len != 0 && md_alg == MBEDTLS_MD_NONE )
return( 0 );
if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
return( -1 );
if ( *hash_len != 0 && *hash_len != mbedtls_md_get_size( md_info ) )
return ( -1 );
*hash_len = mbedtls_md_get_size( md_info );
return( 0 );
}

41
tests/suites/test_suite_pk.function
View File

@ -883,8 +883,9 @@ exit:
void pk_sign_verify( int type, int parameter, int sign_ret, int verify_ret )
{
mbedtls_pk_context pk;
size_t sig_len;
unsigned char hash[MBEDTLS_MD_MAX_SIZE];
size_t sig_len, hash_len;
mbedtls_md_type_t md = MBEDTLS_MD_SHA256;
unsigned char *hash = NULL;
unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
void *rs_ctx = NULL;
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
@ -898,40 +899,43 @@ void pk_sign_verify( int type, int parameter, int sign_ret, int verify_ret )
mbedtls_ecp_set_max_ops( 42000 );
#endif
hash_len = mbedtls_md_get_size( mbedtls_md_info_from_type( md ) );
ASSERT_ALLOC( hash, hash_len );
mbedtls_pk_init( &pk );
USE_PSA_INIT( );
memset( hash, 0x2a, sizeof hash );
memset( hash, 0x2a, hash_len );
memset( sig, 0, sizeof sig );
TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( type ) ) == 0 );
TEST_ASSERT( pk_genkey( &pk, parameter ) == 0 );
TEST_ASSERT( mbedtls_pk_sign_restartable( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, &sig_len,
TEST_ASSERT( mbedtls_pk_sign_restartable( &pk, md,
hash, hash_len, sig, &sig_len,
mbedtls_test_rnd_std_rand, NULL, rs_ctx ) == sign_ret );
if( sign_ret == 0 )
TEST_ASSERT( sig_len <= MBEDTLS_PK_SIGNATURE_MAX_SIZE );
else
sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE;
TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, sig_len ) == verify_ret );
TEST_ASSERT( mbedtls_pk_verify( &pk, md,
hash, hash_len, sig, sig_len ) == verify_ret );
if( verify_ret == 0 )
{
hash[0]++;
TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, sig_len ) != 0 );
TEST_ASSERT( mbedtls_pk_verify( &pk, md,
hash, hash_len, sig, sig_len ) != 0 );
hash[0]--;
sig[0]++;
TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, sig_len ) != 0 );
TEST_ASSERT( mbedtls_pk_verify( &pk, md,
hash, hash_len, sig, sig_len ) != 0 );
sig[0]--;
}
TEST_ASSERT( mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, sizeof hash,
TEST_ASSERT( mbedtls_pk_sign( &pk, md, hash, hash_len,
sig, &sig_len,
mbedtls_test_rnd_std_rand,
NULL ) == sign_ret );
@ -940,19 +944,19 @@ void pk_sign_verify( int type, int parameter, int sign_ret, int verify_ret )
else
sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE;
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, sig_len, rs_ctx ) == verify_ret );
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, md,
hash, hash_len, sig, sig_len, rs_ctx ) == verify_ret );
if( verify_ret == 0 )
{
hash[0]++;
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, sig_len, rs_ctx ) != 0 );
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, md,
hash, hash_len, sig, sig_len, rs_ctx ) != 0 );
hash[0]--;
sig[0]++;
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, MBEDTLS_MD_SHA256,
hash, sizeof hash, sig, sig_len, rs_ctx ) != 0 );
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, md,
hash, hash_len, sig, sig_len, rs_ctx ) != 0 );
sig[0]--;
}
@ -961,6 +965,7 @@ exit:
mbedtls_pk_restart_free( rs_ctx );
#endif
mbedtls_pk_free( &pk );
mbedtls_free( hash );
USE_PSA_DONE( );
}
/* END_CASE */