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Provide a version of pkcs5_pbkdf2_hmac without MD usage

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Use the new implementation locally
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2022-08-31 13:29:38 -04:00
parent 97fc247d6a
commit dd36c76f09
3 changed files with 158 additions and 46 deletions
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20
include/mbedtls/pkcs5.h
View file

@ -70,6 +70,26 @@ int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
#endif /* MBEDTLS_ASN1_PARSE_C */
/**
* \brief PKCS#5 PBKDF2 using HMAC without using the HMAC context
*
* \param md_type Hash algorithm used
* \param password Password to use when generating key
* \param plen Length of password
* \param salt Salt to use when generating key
* \param slen Length of salt
* \param iteration_count Iteration count
* \param key_length Length of generated key in bytes
* \param output Generated key. Must be at least as big as key_length
*
* \returns 0 on success, or a MBEDTLS_ERR_XXX code if verification fails.
*/
int mbedtls_pkcs5_pbkdf2_hmac_ext( mbedtls_md_type_t md_type,
const unsigned char *password,
size_t plen, const unsigned char *salt, size_t slen,
unsigned int iteration_count,
uint32_t key_length, unsigned char *output );
/**
* \brief PKCS#5 PBKDF2 using HMAC
*

168
library/pkcs5.c
View file

@ -49,6 +49,9 @@
#define mbedtls_printf printf
#endif
#include "hash_info.h"
#include "mbedtls/psa_util.h"
#if defined(MBEDTLS_ASN1_PARSE_C)
static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params,
mbedtls_asn1_buf *salt, int *iterations,
@ -118,9 +121,7 @@ int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
unsigned char key[32], iv[32];
size_t olen = 0;
const mbedtls_md_info_t *md_info;
const mbedtls_cipher_info_t *cipher_info;
mbedtls_md_context_t md_ctx;
mbedtls_cipher_type_t cipher_alg;
mbedtls_cipher_context_t cipher_ctx;
@ -153,10 +154,6 @@ int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
return( ret );
}
md_info = mbedtls_md_info_from_type( md_type );
if( md_info == NULL )
return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
if( ( ret = mbedtls_asn1_get_alg( &p, end, &enc_scheme_oid,
&enc_scheme_params ) ) != 0 )
{
@ -182,16 +179,13 @@ int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT );
}
mbedtls_md_init( &md_ctx );
mbedtls_cipher_init( &cipher_ctx );
memcpy( iv, enc_scheme_params.p, enc_scheme_params.len );
if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
goto exit;
if( ( ret = mbedtls_pkcs5_pbkdf2_hmac( &md_ctx, pwd, pwdlen, salt.p, salt.len,
iterations, keylen, key ) ) != 0 )
if( ( ret = mbedtls_pkcs5_pbkdf2_hmac_ext( md_type, pwd, pwdlen, salt.p,
salt.len, iterations, keylen,
key ) ) != 0 )
{
goto exit;
}
@ -208,7 +202,6 @@ int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH;
exit:
mbedtls_md_free( &md_ctx );
mbedtls_cipher_free( &cipher_ctx );
return( ret );
@ -297,6 +290,134 @@ cleanup:
return( ret );
}
int mbedtls_pkcs5_pbkdf2_hmac_ext( mbedtls_md_type_t md_alg,
const unsigned char *password,
size_t plen, const unsigned char *salt, size_t slen,
unsigned int iteration_count,
uint32_t key_length, unsigned char *output )
{
#if defined(MBEDTLS_MD_C)
mbedtls_md_context_t md_ctx;
const mbedtls_md_info_t *md_info;
int ret;
mbedtls_md_init( &md_ctx );
md_info = mbedtls_md_info_from_type( md_alg );
if( md_info == NULL )
return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
goto exit;
ret = mbedtls_pkcs5_pbkdf2_hmac( &md_ctx, password, plen, salt, slen,
iteration_count, key_length, output );
exit:
mbedtls_md_free( &md_ctx );
return( ret );
#else
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
int j;
unsigned int i;
unsigned char md1[PSA_HASH_MAX_SIZE];
unsigned char work[PSA_HASH_MAX_SIZE];
unsigned char md_size = mbedtls_hash_info_get_size( md_alg );
psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t use_len, out_len, out_size;
unsigned char *out_p = output;
unsigned char counter[4];
mbedtls_svc_key_id_t psa_hmac_key;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
memset( counter, 0, 4 );
counter[3] = 1;
psa_algorithm_t alg = PSA_ALG_HMAC( mbedtls_hash_info_psa_from_md( md_alg ) );
out_size = PSA_MAC_LENGTH( PSA_KEY_TYPE_HMAC, 0, alg );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_MESSAGE );
psa_set_key_algorithm( &attributes, alg );
psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
if( key_length == 0 )
return 0;
if( ( status = psa_import_key( &attributes,
password, plen,
&psa_hmac_key ) ) != PSA_SUCCESS )
{
return MBEDTLS_ERR_ERROR_GENERIC_ERROR;
}
#if UINT_MAX > 0xFFFFFFFF
if( iteration_count > 0xFFFFFFFF )
return( MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA );
#endif
while( key_length )
{
status = psa_mac_sign_setup( &operation, psa_hmac_key,
PSA_ALG_HMAC( alg ) );
if( status != PSA_SUCCESS )
goto cleanup;
// U1 ends up in work
if( ( status = psa_mac_update( &operation, salt, slen ) ) != PSA_SUCCESS )
goto cleanup;
if( ( status = psa_mac_update( &operation, counter, 4 ) ) != PSA_SUCCESS )
goto cleanup;
if( ( status = psa_mac_sign_finish( &operation, work, out_size, &out_len ) )
!= PSA_SUCCESS )
goto cleanup;
memcpy( md1, work, md_size );
for( i = 1; i < iteration_count; i++ )
{
// U2 ends up in md1
//
status = psa_mac_sign_setup( &operation, psa_hmac_key,
PSA_ALG_HMAC( alg ) );
if( status != PSA_SUCCESS )
goto cleanup;
if( ( status = psa_mac_update( &operation, md1, md_size ) ) != PSA_SUCCESS )
goto cleanup;
if( ( status = psa_mac_sign_finish( &operation, md1, out_size, &out_len ) ) != PSA_SUCCESS )
goto cleanup;
// U1 xor U2
//
for( j = 0; j < md_size; j++ )
work[j] ^= md1[j];
}
use_len = ( key_length < md_size ) ? key_length : md_size;
memcpy( out_p, work, use_len );
key_length -= (uint32_t) use_len;
out_p += use_len;
for( i = 4; i > 0; i-- )
if( ++counter[i - 1] != 0 )
break;
}
cleanup:
/* Zeroise buffers to clear sensitive data from memory. */
mbedtls_platform_zeroize( work, PSA_HASH_MAX_SIZE );
mbedtls_platform_zeroize( md1, PSA_HASH_MAX_SIZE );
psa_destroy_key( psa_hmac_key );
ret = (status != PSA_SUCCESS? MBEDTLS_ERR_ERROR_GENERIC_ERROR: 0);
status = psa_mac_abort( &operation );
if( ret == 0 && status != PSA_SUCCESS )
ret = MBEDTLS_ERR_ERROR_GENERIC_ERROR;
return ( ret );
#endif
}
#if defined(MBEDTLS_SELF_TEST)
#if !defined(MBEDTLS_SHA1_C)
@ -362,32 +483,15 @@ static const unsigned char result_key_test_data[MAX_TESTS][32] =
int mbedtls_pkcs5_self_test( int verbose )
{
mbedtls_md_context_t sha1_ctx;
const mbedtls_md_info_t *info_sha1;
int ret, i;
unsigned char key[64];
mbedtls_md_init( &sha1_ctx );
info_sha1 = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
if( info_sha1 == NULL )
{
ret = 1;
goto exit;
}
if( ( ret = mbedtls_md_setup( &sha1_ctx, info_sha1, 1 ) ) != 0 )
{
ret = 1;
goto exit;
}
for( i = 0; i < MAX_TESTS; i++ )
{
if( verbose != 0 )
mbedtls_printf( " PBKDF2 (SHA1) #%d: ", i );
ret = mbedtls_pkcs5_pbkdf2_hmac( &sha1_ctx, password_test_data[i],
ret = mbedtls_pkcs5_pbkdf2_hmac_ext( MBEDTLS_MD_SHA1, password_test_data[i],
plen_test_data[i], salt_test_data[i],
slen_test_data[i], it_cnt_test_data[i],
key_len_test_data[i], key );
@ -409,8 +513,6 @@ int mbedtls_pkcs5_self_test( int verbose )
mbedtls_printf( "\n" );
exit:
mbedtls_md_free( &sha1_ctx );
return( ret );
}
#endif /* MBEDTLS_SHA1_C */

14
tests/suites/test_suite_pkcs5.function
View file

@ -11,24 +11,14 @@
void pbkdf2_hmac( int hash, data_t * pw_str, data_t * salt_str,
int it_cnt, int key_len, data_t * result_key_string )
{
mbedtls_md_context_t ctx;
const mbedtls_md_info_t *info;
unsigned char key[100];
mbedtls_md_init( &ctx );
info = mbedtls_md_info_from_type( hash );
TEST_ASSERT( info != NULL );
TEST_ASSERT( mbedtls_md_setup( &ctx, info, 1 ) == 0 );
TEST_ASSERT( mbedtls_pkcs5_pbkdf2_hmac( &ctx, pw_str->x, pw_str->len, salt_str->x, salt_str->len,
TEST_ASSERT( mbedtls_pkcs5_pbkdf2_hmac_ext( hash, pw_str->x, pw_str->len,
salt_str->x, salt_str->len,
it_cnt, key_len, key ) == 0 );
TEST_ASSERT( mbedtls_test_hexcmp( key, result_key_string->x,
key_len, result_key_string->len ) == 0 );
exit:
mbedtls_md_free( &ctx );
}
/* END_CASE */