| /** |
| * \file pkcs5.c |
| * |
| * \brief PKCS#5 functions |
| * |
| * \author Mathias Olsson <mathias@kompetensum.com> |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * PKCS#5 includes PBKDF2 and more |
| * |
| * http://tools.ietf.org/html/rfc2898 (Specification) |
| * http://tools.ietf.org/html/rfc6070 (Test vectors) |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_PKCS5_C) |
| |
| #include "mbedtls/pkcs5.h" |
| #include "mbedtls/error.h" |
| |
| #if defined(MBEDTLS_ASN1_PARSE_C) |
| #include "mbedtls/asn1.h" |
| #include "mbedtls/cipher.h" |
| #include "mbedtls/oid.h" |
| #endif /* MBEDTLS_ASN1_PARSE_C */ |
| |
| #include <string.h> |
| |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdio.h> |
| #define mbedtls_printf printf |
| #endif |
| |
| #if defined(MBEDTLS_ASN1_PARSE_C) |
| static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params, |
| mbedtls_asn1_buf *salt, int *iterations, |
| int *keylen, mbedtls_md_type_t *md_type ) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| mbedtls_asn1_buf prf_alg_oid; |
| unsigned char *p = params->p; |
| const unsigned char *end = params->p + params->len; |
| |
| if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ); |
| /* |
| * PBKDF2-params ::= SEQUENCE { |
| * salt OCTET STRING, |
| * iterationCount INTEGER, |
| * keyLength INTEGER OPTIONAL |
| * prf AlgorithmIdentifier DEFAULT algid-hmacWithSHA1 |
| * } |
| * |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &salt->len, |
| MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret ) ); |
| |
| salt->p = p; |
| p += salt->len; |
| |
| if( ( ret = mbedtls_asn1_get_int( &p, end, iterations ) ) != 0 ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret ) ); |
| |
| if( p == end ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_asn1_get_int( &p, end, keylen ) ) != 0 ) |
| { |
| if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret ) ); |
| } |
| |
| if( p == end ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_asn1_get_alg_null( &p, end, &prf_alg_oid ) ) != 0 ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret ) ); |
| |
| if( mbedtls_oid_get_md_hmac( &prf_alg_oid, md_type ) != 0 ) |
| return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE ); |
| |
| if( p != end ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode, |
| const unsigned char *pwd, size_t pwdlen, |
| const unsigned char *data, size_t datalen, |
| unsigned char *output ) |
| { |
| int ret, iterations = 0, keylen = 0; |
| unsigned char *p, *end; |
| mbedtls_asn1_buf kdf_alg_oid, enc_scheme_oid, kdf_alg_params, enc_scheme_params; |
| mbedtls_asn1_buf salt; |
| 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; |
| |
| p = pbe_params->p; |
| end = p + pbe_params->len; |
| |
| /* |
| * PBES2-params ::= SEQUENCE { |
| * keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}}, |
| * encryptionScheme AlgorithmIdentifier {{PBES2-Encs}} |
| * } |
| */ |
| if( pbe_params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ); |
| |
| if( ( ret = mbedtls_asn1_get_alg( &p, end, &kdf_alg_oid, |
| &kdf_alg_params ) ) != 0 ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret ) ); |
| |
| // Only PBKDF2 supported at the moment |
| // |
| if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBKDF2, &kdf_alg_oid ) != 0 ) |
| return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE ); |
| |
| if( ( ret = pkcs5_parse_pbkdf2_params( &kdf_alg_params, |
| &salt, &iterations, &keylen, |
| &md_type ) ) != 0 ) |
| { |
| 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 ) |
| { |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret ) ); |
| } |
| |
| if( mbedtls_oid_get_cipher_alg( &enc_scheme_oid, &cipher_alg ) != 0 ) |
| return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE ); |
| |
| cipher_info = mbedtls_cipher_info_from_type( cipher_alg ); |
| if( cipher_info == NULL ) |
| return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE ); |
| |
| /* |
| * The value of keylen from pkcs5_parse_pbkdf2_params() is ignored |
| * since it is optional and we don't know if it was set or not |
| */ |
| keylen = cipher_info->key_bitlen / 8; |
| |
| if( enc_scheme_params.tag != MBEDTLS_ASN1_OCTET_STRING || |
| enc_scheme_params.len != cipher_info->iv_size ) |
| { |
| 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 ) |
| { |
| goto exit; |
| } |
| |
| if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 ) |
| goto exit; |
| |
| if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, |
| (mbedtls_operation_t) mode ) ) != 0 ) |
| goto exit; |
| |
| if( ( ret = mbedtls_cipher_crypt( &cipher_ctx, iv, enc_scheme_params.len, |
| data, datalen, output, &olen ) ) != 0 ) |
| ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH; |
| |
| exit: |
| mbedtls_md_free( &md_ctx ); |
| mbedtls_cipher_free( &cipher_ctx ); |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_ASN1_PARSE_C */ |
| |
| int mbedtls_pkcs5_pbkdf2_hmac( mbedtls_md_context_t *ctx, |
| 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 ) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| int j; |
| unsigned int i; |
| unsigned char md1[MBEDTLS_MD_MAX_SIZE]; |
| unsigned char work[MBEDTLS_MD_MAX_SIZE]; |
| unsigned char md_size = mbedtls_md_get_size( ctx->md_info ); |
| size_t use_len; |
| unsigned char *out_p = output; |
| unsigned char counter[4]; |
| |
| memset( counter, 0, 4 ); |
| counter[3] = 1; |
| |
| #if UINT_MAX > 0xFFFFFFFF |
| if( iteration_count > 0xFFFFFFFF ) |
| return( MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA ); |
| #endif |
| |
| if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 ) |
| return( ret ); |
| while( key_length ) |
| { |
| // U1 ends up in work |
| // |
| if( ( ret = mbedtls_md_hmac_update( ctx, salt, slen ) ) != 0 ) |
| goto cleanup; |
| |
| if( ( ret = mbedtls_md_hmac_update( ctx, counter, 4 ) ) != 0 ) |
| goto cleanup; |
| |
| if( ( ret = mbedtls_md_hmac_finish( ctx, work ) ) != 0 ) |
| goto cleanup; |
| |
| if( ( ret = mbedtls_md_hmac_reset( ctx ) ) != 0 ) |
| goto cleanup; |
| |
| memcpy( md1, work, md_size ); |
| |
| for( i = 1; i < iteration_count; i++ ) |
| { |
| // U2 ends up in md1 |
| // |
| if( ( ret = mbedtls_md_hmac_update( ctx, md1, md_size ) ) != 0 ) |
| goto cleanup; |
| |
| if( ( ret = mbedtls_md_hmac_finish( ctx, md1 ) ) != 0 ) |
| goto cleanup; |
| |
| if( ( ret = mbedtls_md_hmac_reset( ctx ) ) != 0 ) |
| 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, MBEDTLS_MD_MAX_SIZE ); |
| mbedtls_platform_zeroize( md1, MBEDTLS_MD_MAX_SIZE ); |
| |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| |
| #if !defined(MBEDTLS_SHA1_C) |
| int mbedtls_pkcs5_self_test( int verbose ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( " PBKDF2 (SHA1): skipped\n\n" ); |
| |
| return( 0 ); |
| } |
| #else |
| |
| #define MAX_TESTS 6 |
| |
| static const size_t plen_test_data[MAX_TESTS] = |
| { 8, 8, 8, 24, 9 }; |
| |
| static const unsigned char password_test_data[MAX_TESTS][32] = |
| { |
| "password", |
| "password", |
| "password", |
| "passwordPASSWORDpassword", |
| "pass\0word", |
| }; |
| |
| static const size_t slen_test_data[MAX_TESTS] = |
| { 4, 4, 4, 36, 5 }; |
| |
| static const unsigned char salt_test_data[MAX_TESTS][40] = |
| { |
| "salt", |
| "salt", |
| "salt", |
| "saltSALTsaltSALTsaltSALTsaltSALTsalt", |
| "sa\0lt", |
| }; |
| |
| static const uint32_t it_cnt_test_data[MAX_TESTS] = |
| { 1, 2, 4096, 4096, 4096 }; |
| |
| static const uint32_t key_len_test_data[MAX_TESTS] = |
| { 20, 20, 20, 25, 16 }; |
| |
| static const unsigned char result_key_test_data[MAX_TESTS][32] = |
| { |
| { 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71, |
| 0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06, |
| 0x2f, 0xe0, 0x37, 0xa6 }, |
| { 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c, |
| 0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0, |
| 0xd8, 0xde, 0x89, 0x57 }, |
| { 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a, |
| 0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0, |
| 0x65, 0xa4, 0x29, 0xc1 }, |
| { 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b, |
| 0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a, |
| 0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70, |
| 0x38 }, |
| { 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d, |
| 0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 }, |
| }; |
| |
| 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], |
| plen_test_data[i], salt_test_data[i], |
| slen_test_data[i], it_cnt_test_data[i], |
| key_len_test_data[i], key ); |
| if( ret != 0 || |
| memcmp( result_key_test_data[i], key, key_len_test_data[i] ) != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| |
| ret = 1; |
| goto exit; |
| } |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "passed\n" ); |
| } |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "\n" ); |
| |
| exit: |
| mbedtls_md_free( &sha1_ctx ); |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_SHA1_C */ |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #endif /* MBEDTLS_PKCS5_C */ |
