| /* |
| * PKCS#12 Personal Information Exchange Syntax |
| * |
| * 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. |
| */ |
| /* |
| * The PKCS #12 Personal Information Exchange Syntax Standard v1.1 |
| * |
| * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf |
| * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_PKCS12_C) |
| |
| #include "mbedtls/pkcs12.h" |
| #include "mbedtls/asn1.h" |
| #include "mbedtls/cipher.h" |
| #include "mbedtls/platform_util.h" |
| #include "mbedtls/error.h" |
| |
| #include <string.h> |
| |
| #if defined(MBEDTLS_DES_C) |
| #include "mbedtls/des.h" |
| #endif |
| |
| #if defined(MBEDTLS_ASN1_PARSE_C) |
| |
| static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params, |
| mbedtls_asn1_buf *salt, int *iterations ) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| unsigned char **p = ¶ms->p; |
| const unsigned char *end = params->p + params->len; |
| |
| /* |
| * pkcs-12PbeParams ::= SEQUENCE { |
| * salt OCTET STRING, |
| * iterations INTEGER |
| * } |
| * |
| */ |
| if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ); |
| |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS12_PBE_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_PKCS12_PBE_INVALID_FORMAT, ret ) ); |
| |
| if( *p != end ) |
| return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); |
| |
| return( 0 ); |
| } |
| |
| #define PKCS12_MAX_PWDLEN 128 |
| |
| static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type, |
| const unsigned char *pwd, size_t pwdlen, |
| unsigned char *key, size_t keylen, |
| unsigned char *iv, size_t ivlen ) |
| { |
| int ret, iterations = 0; |
| mbedtls_asn1_buf salt; |
| size_t i; |
| unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2]; |
| |
| if( pwdlen > PKCS12_MAX_PWDLEN ) |
| return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA ); |
| |
| memset( &salt, 0, sizeof(mbedtls_asn1_buf) ); |
| memset( &unipwd, 0, sizeof(unipwd) ); |
| |
| if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt, |
| &iterations ) ) != 0 ) |
| return( ret ); |
| |
| for( i = 0; i < pwdlen; i++ ) |
| unipwd[i * 2 + 1] = pwd[i]; |
| |
| if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2, |
| salt.p, salt.len, md_type, |
| MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| if( iv == NULL || ivlen == 0 ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2, |
| salt.p, salt.len, md_type, |
| MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| return( 0 ); |
| } |
| |
| #undef PKCS12_MAX_PWDLEN |
| |
| int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode, |
| mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type, |
| const unsigned char *pwd, size_t pwdlen, |
| const unsigned char *data, size_t len, |
| unsigned char *output ) |
| { |
| int ret, keylen = 0; |
| unsigned char key[32]; |
| unsigned char iv[16]; |
| const mbedtls_cipher_info_t *cipher_info; |
| mbedtls_cipher_context_t cipher_ctx; |
| size_t olen = 0; |
| |
| if( pwd == NULL && pwdlen != 0 ) |
| return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA ); |
| |
| cipher_info = mbedtls_cipher_info_from_type( cipher_type ); |
| if( cipher_info == NULL ) |
| return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE ); |
| |
| keylen = cipher_info->key_bitlen / 8; |
| |
| if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen, |
| key, keylen, |
| iv, cipher_info->iv_size ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| mbedtls_cipher_init( &cipher_ctx ); |
| |
| 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_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 ) |
| goto exit; |
| |
| if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 ) |
| goto exit; |
| |
| if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len, |
| output, &olen ) ) != 0 ) |
| { |
| goto exit; |
| } |
| |
| if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 ) |
| ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH; |
| |
| exit: |
| mbedtls_platform_zeroize( key, sizeof( key ) ); |
| mbedtls_platform_zeroize( iv, sizeof( iv ) ); |
| mbedtls_cipher_free( &cipher_ctx ); |
| |
| return( ret ); |
| } |
| |
| #endif /* MBEDTLS_ASN1_PARSE_C */ |
| |
| static void pkcs12_fill_buffer( unsigned char *data, size_t data_len, |
| const unsigned char *filler, size_t fill_len ) |
| { |
| unsigned char *p = data; |
| size_t use_len; |
| |
| if( filler != NULL && fill_len != 0 ) |
| { |
| while( data_len > 0 ) |
| { |
| use_len = ( data_len > fill_len ) ? fill_len : data_len; |
| memcpy( p, filler, use_len ); |
| p += use_len; |
| data_len -= use_len; |
| } |
| } |
| else |
| { |
| /* If either of the above are not true then clearly there is nothing |
| * that this function can do. The function should *not* be called |
| * under either of those circumstances, as you could end up with an |
| * incorrect output but for safety's sake, leaving the check in as |
| * otherwise we could end up with memory corruption.*/ |
| } |
| } |
| |
| int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen, |
| const unsigned char *pwd, size_t pwdlen, |
| const unsigned char *salt, size_t saltlen, |
| mbedtls_md_type_t md_type, int id, int iterations ) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| unsigned int j; |
| |
| unsigned char diversifier[128]; |
| unsigned char salt_block[128], pwd_block[128], hash_block[128]; |
| unsigned char hash_output[MBEDTLS_MD_MAX_SIZE]; |
| unsigned char *p; |
| unsigned char c; |
| int use_password = 0; |
| int use_salt = 0; |
| |
| size_t hlen, use_len, v, i; |
| |
| const mbedtls_md_info_t *md_info; |
| mbedtls_md_context_t md_ctx; |
| |
| // This version only allows max of 64 bytes of password or salt |
| if( datalen > 128 || pwdlen > 64 || saltlen > 64 ) |
| return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA ); |
| |
| if( pwd == NULL && pwdlen != 0 ) |
| return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA ); |
| |
| if( salt == NULL && saltlen != 0 ) |
| return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA ); |
| |
| use_password = ( pwd && pwdlen != 0 ); |
| use_salt = ( salt && saltlen != 0 ); |
| |
| md_info = mbedtls_md_info_from_type( md_type ); |
| if( md_info == NULL ) |
| return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE ); |
| |
| mbedtls_md_init( &md_ctx ); |
| |
| if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 ) |
| return( ret ); |
| hlen = mbedtls_md_get_size( md_info ); |
| |
| if( hlen <= 32 ) |
| v = 64; |
| else |
| v = 128; |
| |
| memset( diversifier, (unsigned char) id, v ); |
| |
| if( use_salt != 0 ) |
| { |
| pkcs12_fill_buffer( salt_block, v, salt, saltlen ); |
| } |
| |
| if( use_password != 0 ) |
| { |
| pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen ); |
| } |
| |
| p = data; |
| while( datalen > 0 ) |
| { |
| // Calculate hash( diversifier || salt_block || pwd_block ) |
| if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 ) |
| goto exit; |
| |
| if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 ) |
| goto exit; |
| |
| if( use_salt != 0 ) |
| { |
| if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v )) != 0 ) |
| goto exit; |
| } |
| |
| if( use_password != 0) |
| { |
| if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v )) != 0 ) |
| goto exit; |
| } |
| |
| if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 ) |
| goto exit; |
| |
| // Perform remaining ( iterations - 1 ) recursive hash calculations |
| for( i = 1; i < (size_t) iterations; i++ ) |
| { |
| if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 ) |
| goto exit; |
| } |
| |
| use_len = ( datalen > hlen ) ? hlen : datalen; |
| memcpy( p, hash_output, use_len ); |
| datalen -= use_len; |
| p += use_len; |
| |
| if( datalen == 0 ) |
| break; |
| |
| // Concatenating copies of hash_output into hash_block (B) |
| pkcs12_fill_buffer( hash_block, v, hash_output, hlen ); |
| |
| // B += 1 |
| for( i = v; i > 0; i-- ) |
| if( ++hash_block[i - 1] != 0 ) |
| break; |
| |
| if( use_salt != 0 ) |
| { |
| // salt_block += B |
| c = 0; |
| for( i = v; i > 0; i-- ) |
| { |
| j = salt_block[i - 1] + hash_block[i - 1] + c; |
| c = MBEDTLS_BYTE_1( j ); |
| salt_block[i - 1] = MBEDTLS_BYTE_0( j ); |
| } |
| } |
| |
| if( use_password != 0 ) |
| { |
| // pwd_block += B |
| c = 0; |
| for( i = v; i > 0; i-- ) |
| { |
| j = pwd_block[i - 1] + hash_block[i - 1] + c; |
| c = MBEDTLS_BYTE_1( j ); |
| pwd_block[i - 1] = MBEDTLS_BYTE_0( j ); |
| } |
| } |
| } |
| |
| ret = 0; |
| |
| exit: |
| mbedtls_platform_zeroize( salt_block, sizeof( salt_block ) ); |
| mbedtls_platform_zeroize( pwd_block, sizeof( pwd_block ) ); |
| mbedtls_platform_zeroize( hash_block, sizeof( hash_block ) ); |
| mbedtls_platform_zeroize( hash_output, sizeof( hash_output ) ); |
| |
| mbedtls_md_free( &md_ctx ); |
| |
| return( ret ); |
| } |
| |
| #endif /* MBEDTLS_PKCS12_C */ |
