333 lines
9.5 KiB
C
333 lines
9.5 KiB
C
/*
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* PKCS#12 Personal Information Exchange Syntax
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* The PKCS #12 Personal Information Exchange Syntax Standard v1.1
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*
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* http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
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* ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_PKCS12_C)
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#include "polarssl/pkcs12.h"
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#include "polarssl/asn1.h"
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#include "polarssl/cipher.h"
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#if defined(POLARSSL_ARC4_C)
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#include "polarssl/arc4.h"
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#endif
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#if defined(POLARSSL_DES_C)
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#include "polarssl/des.h"
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#endif
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static int pkcs12_parse_pbe_params( asn1_buf *params,
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asn1_buf *salt, int *iterations )
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{
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int ret;
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unsigned char **p = ¶ms->p;
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const unsigned char *end = params->p + params->len;
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/*
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* pkcs-12PbeParams ::= SEQUENCE {
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* salt OCTET STRING,
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* iterations INTEGER
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* }
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*
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*/
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if( params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
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return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT +
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POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
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if( ( ret = asn1_get_tag( p, end, &salt->len, ASN1_OCTET_STRING ) ) != 0 )
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return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
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salt->p = *p;
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*p += salt->len;
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if( ( ret = asn1_get_int( p, end, iterations ) ) != 0 )
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return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
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if( *p != end )
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return( POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT +
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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static int pkcs12_pbe_derive_key_iv( asn1_buf *pbe_params, md_type_t md_type,
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const unsigned char *pwd, size_t pwdlen,
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unsigned char *key, size_t keylen,
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unsigned char *iv, size_t ivlen )
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{
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int ret, iterations;
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asn1_buf salt;
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size_t i;
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unsigned char unipwd[258];
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memset(&salt, 0, sizeof(asn1_buf));
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memset(&unipwd, 0, sizeof(unipwd));
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if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt, &iterations ) ) != 0 )
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return( ret );
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for(i = 0; i < pwdlen; i++)
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unipwd[i * 2 + 1] = pwd[i];
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if( ( ret = pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
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salt.p, salt.len, md_type,
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PKCS12_DERIVE_KEY, iterations ) ) != 0 )
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{
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return( ret );
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}
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if( iv == NULL || ivlen == 0 )
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return( 0 );
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if( ( ret = pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
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salt.p, salt.len, md_type,
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PKCS12_DERIVE_IV, iterations ) ) != 0 )
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{
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return( ret );
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}
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return( 0 );
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}
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int pkcs12_pbe_sha1_rc4_128( asn1_buf *pbe_params, int mode,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t len,
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unsigned char *output )
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{
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#if !defined(POLARSSL_ARC4_C)
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((void) pbe_params);
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((void) mode);
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((void) pwd);
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((void) pwdlen);
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((void) data);
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((void) len);
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((void) output);
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return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
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#else
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int ret;
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unsigned char key[16];
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arc4_context ctx;
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((void) mode);
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if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, POLARSSL_MD_SHA1,
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pwd, pwdlen,
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key, 16, NULL, 0 ) ) != 0 )
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{
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return( ret );
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}
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arc4_setup( &ctx, key, 16 );
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if( ( ret = arc4_crypt( &ctx, len, data, output ) ) != 0 )
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return( ret );
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return( 0 );
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#endif /* POLARSSL_ARC4_C */
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}
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int pkcs12_pbe( asn1_buf *pbe_params, int mode,
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cipher_type_t cipher_type, md_type_t md_type,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t len,
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unsigned char *output )
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{
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int ret, keylen = 0;
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unsigned char key[32];
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unsigned char iv[16];
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const cipher_info_t *cipher_info;
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cipher_context_t cipher_ctx;
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size_t olen = 0;
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cipher_info = cipher_info_from_type( cipher_type );
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if( cipher_info == NULL )
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return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
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keylen = cipher_info->key_length / 8;
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if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
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key, keylen,
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iv, cipher_info->iv_size ) ) != 0 )
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{
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return( ret );
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}
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if( ( ret = cipher_init_ctx( &cipher_ctx, cipher_info ) ) != 0 )
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goto exit;
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if( ( ret = cipher_setkey( &cipher_ctx, key, 8 * keylen, mode ) ) != 0 )
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goto exit;
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if( ( ret = cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
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goto exit;
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if( ( ret = cipher_reset( &cipher_ctx ) ) != 0 )
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goto exit;
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if( ( ret = cipher_update( &cipher_ctx, data, len,
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output, &olen ) ) != 0 )
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{
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goto exit;
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}
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if( ( ret = cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
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ret = POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH;
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exit:
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cipher_free_ctx( &cipher_ctx );
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return( ret );
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}
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static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
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const unsigned char *filler, size_t fill_len )
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{
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unsigned char *p = data;
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size_t use_len;
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while( data_len > 0 )
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{
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use_len = ( data_len > fill_len ) ? fill_len : data_len;
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memcpy( p, filler, use_len );
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p += use_len;
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data_len -= use_len;
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}
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}
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int pkcs12_derivation( unsigned char *data, size_t datalen,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *salt, size_t saltlen,
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md_type_t md_type, int id, int iterations )
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{
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int ret;
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unsigned int j;
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unsigned char diversifier[128];
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unsigned char salt_block[128], pwd_block[128], hash_block[128];
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unsigned char hash_output[POLARSSL_MD_MAX_SIZE];
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unsigned char *p;
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unsigned char c;
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size_t hlen, use_len, v, i;
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const md_info_t *md_info;
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md_context_t md_ctx;
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// This version only allows max of 64 bytes of password or salt
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if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
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return( POLARSSL_ERR_PKCS12_BAD_INPUT_DATA );
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md_info = md_info_from_type( md_type );
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if( md_info == NULL )
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return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
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if ( ( ret = md_init_ctx( &md_ctx, md_info ) ) != 0 )
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return( ret );
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hlen = md_get_size( md_info );
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if( hlen <= 32 )
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v = 64;
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else
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v = 128;
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memset( diversifier, (unsigned char) id, v );
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pkcs12_fill_buffer( salt_block, v, salt, saltlen );
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pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
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p = data;
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while( datalen > 0 )
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{
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// Calculate hash( diversifier || salt_block || pwd_block )
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if( ( ret = md_starts( &md_ctx ) ) != 0 )
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goto exit;
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if( ( ret = md_update( &md_ctx, diversifier, v ) ) != 0 )
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goto exit;
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if( ( ret = md_update( &md_ctx, salt_block, v ) ) != 0 )
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goto exit;
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if( ( ret = md_update( &md_ctx, pwd_block, v ) ) != 0 )
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goto exit;
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if( ( ret = md_finish( &md_ctx, hash_output ) ) != 0 )
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goto exit;
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// Perform remaining ( iterations - 1 ) recursive hash calculations
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for( i = 1; i < (size_t) iterations; i++ )
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{
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if( ( ret = md( md_info, hash_output, hlen, hash_output ) ) != 0 )
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goto exit;
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}
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use_len = ( datalen > hlen ) ? hlen : datalen;
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memcpy( p, hash_output, use_len );
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datalen -= use_len;
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p += use_len;
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if( datalen == 0 )
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break;
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// Concatenating copies of hash_output into hash_block (B)
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pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
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// B += 1
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for( i = v; i > 0; i-- )
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if( ++hash_block[i - 1] != 0 )
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break;
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// salt_block += B
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c = 0;
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for( i = v; i > 0; i-- )
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{
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j = salt_block[i - 1] + hash_block[i - 1] + c;
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c = (unsigned char) (j >> 8);
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salt_block[i - 1] = j & 0xFF;
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}
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// pwd_block += B
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c = 0;
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for( i = v; i > 0; i-- )
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{
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j = pwd_block[i - 1] + hash_block[i - 1] + c;
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c = (unsigned char) (j >> 8);
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pwd_block[i - 1] = j & 0xFF;
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}
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}
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ret = 0;
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exit:
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md_free_ctx( &md_ctx );
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return( ret );
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}
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#endif /* POLARSSL_PKCS12_C */
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