mbedtls/library/pkcs12.c

373 lines
11 KiB
C
Raw Normal View History

/*
* PKCS#12 Personal Information Exchange Syntax
*
* Copyright The Mbed TLS Contributors
2015-09-04 14:21:07 +02:00
* SPDX-License-Identifier: Apache-2.0
*
2015-09-04 14:21:07 +02:00
* 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
*
2015-09-04 14:21:07 +02:00
* http://www.apache.org/licenses/LICENSE-2.0
*
2015-09-04 14:21:07 +02:00
* 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)
2015-03-09 18:05:11 +01:00
#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)
2015-03-09 18:05:11 +01:00
#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 = &params->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 );
}
2015-09-28 18:34:48 +02:00
#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;
2015-09-28 18:34:48 +02:00
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 );
}
2015-09-28 18:34:48 +02:00
#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 );
2015-06-18 15:28:12 +02:00
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 )
2013-07-03 14:44:40 +02:00
goto exit;
if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
2013-07-03 14:44:40 +02:00
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 )
2013-07-03 14:44:40 +02:00
goto exit;
if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
output, &olen ) ) != 0 )
{
2013-07-03 14:44:40 +02:00
goto exit;
}
if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
2013-07-03 14:44:40 +02:00
exit:
mbedtls_platform_zeroize( key, sizeof( key ) );
mbedtls_platform_zeroize( iv, sizeof( iv ) );
mbedtls_cipher_free( &cipher_ctx );
2013-07-03 14:44:40 +02:00
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 empty_string[2] = { 0, 0 };
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 )
2013-07-03 14:44:40 +02:00
goto exit;
if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
2013-07-03 14:44:40 +02:00
goto exit;
if( use_salt != 0 )
{
if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v )) != 0 )
goto exit;
}
else
{
if( ( ret = mbedtls_md_update( &md_ctx, empty_string,
sizeof( empty_string ) )) != 0 )
goto exit;
}
if( use_password != 0)
{
if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v )) != 0 )
goto exit;
}
else
{
if( ( ret = mbedtls_md_update( &md_ctx, empty_string,
sizeof( empty_string ) )) != 0 )
goto exit;
}
if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
2013-07-03 14:44:40 +02:00
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 )
2013-07-03 14:44:40 +02:00
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 );
}
}
}
2013-07-03 14:44:40 +02:00
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 ) );
2014-06-18 13:59:38 +02:00
mbedtls_md_free( &md_ctx );
2013-07-03 14:44:40 +02:00
return( ret );
}
#endif /* MBEDTLS_PKCS12_C */