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mbedtls/library/pkcs12.c

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/*
* PKCS#12 Personal Information Exchange Syntax
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* 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 "polarssl/config.h"
#if defined(POLARSSL_PKCS12_C)
#include "polarssl/pkcs12.h"
#include "polarssl/asn1.h"
#include "polarssl/cipher.h"
#if defined(POLARSSL_ARC4_C)
#include "polarssl/arc4.h"
#endif
#if defined(POLARSSL_DES_C)
#include "polarssl/des.h"
#endif
static int pkcs12_parse_pbe_params( asn1_buf *params,
asn1_buf *salt, int *iterations )
{
int ret;
unsigned char **p = &params->p;
const unsigned char *end = params->p + params->len;
/*
* pkcs-12PbeParams ::= SEQUENCE {
* salt OCTET STRING,
* iterations INTEGER
* }
*
*/
if( params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
if( ( ret = asn1_get_tag( p, end, &salt->len, ASN1_OCTET_STRING ) ) != 0 )
return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
salt->p = *p;
*p += salt->len;
if( ( ret = asn1_get_int( p, end, iterations ) ) != 0 )
return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
if( *p != end )
return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
static int pkcs12_pbe_derive_key_iv( asn1_buf *pbe_params, 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;
asn1_buf salt;
size_t i;
unsigned char unipwd[258];
memset(&salt, 0, sizeof(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 = pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
salt.p, salt.len, md_type,
PKCS12_DERIVE_KEY, iterations ) ) != 0 )
{
return( ret );
}
if( iv == NULL || ivlen == 0 )
return( 0 );
if( ( ret = pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
salt.p, salt.len, md_type,
PKCS12_DERIVE_IV, iterations ) ) != 0 )
{
return( ret );
}
return( 0 );
}
int pkcs12_pbe_sha1_rc4_128( asn1_buf *pbe_params, int mode,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *data, size_t len,
unsigned char *output )
{
#if !defined(POLARSSL_ARC4_C)
((void) pbe_params);
((void) mode);
((void) pwd);
((void) pwdlen);
((void) data);
((void) len);
((void) output);
return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
#else
int ret;
unsigned char key[16];
arc4_context ctx;
((void) mode);
if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, POLARSSL_MD_SHA1,
pwd, pwdlen,
key, 16, NULL, 0 ) ) != 0 )
{
return( ret );
}
arc4_setup( &ctx, key, 16 );
if( ( ret = arc4_crypt( &ctx, len, data, output ) ) != 0 )
return( ret );
return( 0 );
#endif /* POLARSSL_ARC4_C */
}
int pkcs12_pbe( asn1_buf *pbe_params, int mode,
cipher_type_t cipher_type, 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 cipher_info_t *cipher_info;
cipher_context_t cipher_ctx;
size_t olen = 0;
cipher_info = cipher_info_from_type( cipher_type );
if( cipher_info == NULL )
return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
keylen = cipher_info->key_length / 8;
if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
key, keylen,
iv, cipher_info->iv_size ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_init_ctx( &cipher_ctx, cipher_info ) ) != 0 )
goto exit;
if( ( ret = cipher_setkey( &cipher_ctx, key, 8 * keylen, mode ) ) != 0 )
goto exit;
if( ( ret = cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
goto exit;
if( ( ret = cipher_reset( &cipher_ctx ) ) != 0 )
goto exit;
if( ( ret = cipher_update( &cipher_ctx, data, len,
output, &olen ) ) != 0 )
{
goto exit;
}
if( ( ret = cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
ret = POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH;
exit:
cipher_free_ctx( &cipher_ctx );
return( ret );
}
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;
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;
}
}
int pkcs12_derivation( unsigned char *data, size_t datalen,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *salt, size_t saltlen,
md_type_t md_type, int id, int iterations )
{
int ret;
unsigned int j;
unsigned char diversifier[128];
unsigned char salt_block[128], pwd_block[128], hash_block[128];
unsigned char hash_output[POLARSSL_MD_MAX_SIZE];
unsigned char *p;
unsigned char c;
size_t hlen, use_len, v, i;
const md_info_t *md_info;
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( POLARSSL_ERR_PKCS12_BAD_INPUT_DATA );
md_info = md_info_from_type( md_type );
if( md_info == NULL )
return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
if ( ( ret = md_init_ctx( &md_ctx, md_info ) ) != 0 )
return( ret );
hlen = md_get_size( md_info );
if( hlen <= 32 )
v = 64;
else
v = 128;
memset( diversifier, (unsigned char) id, v );
pkcs12_fill_buffer( salt_block, v, salt, saltlen );
pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
p = data;
while( datalen > 0 )
{
// Calculate hash( diversifier || salt_block || pwd_block )
if( ( ret = md_starts( &md_ctx ) ) != 0 )
goto exit;
if( ( ret = md_update( &md_ctx, diversifier, v ) ) != 0 )
goto exit;
if( ( ret = md_update( &md_ctx, salt_block, v ) ) != 0 )
goto exit;
if( ( ret = md_update( &md_ctx, pwd_block, v ) ) != 0 )
goto exit;
if( ( ret = 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 = 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;
// salt_block += B
c = 0;
for( i = v; i > 0; i-- )
{
j = salt_block[i - 1] + hash_block[i - 1] + c;
c = (unsigned char) (j >> 8);
salt_block[i - 1] = j & 0xFF;
}
// pwd_block += B
c = 0;
for( i = v; i > 0; i-- )
{
j = pwd_block[i - 1] + hash_block[i - 1] + c;
c = (unsigned char) (j >> 8);
pwd_block[i - 1] = j & 0xFF;
}
}
ret = 0;
exit:
md_free_ctx( &md_ctx );
return( ret );
}
#endif /* POLARSSL_PKCS12_C */
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