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/*

 *  PKCS#12 Personal Information Exchange Syntax

 *

 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved

 *  SPDX-License-Identifier: GPL-2.0

 *

 *  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.

 *

 *  This file is part of mbed TLS (https://tls.mbed.org)

 */

/*

 *  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

 */

#if !defined(MBEDTLS_CONFIG_FILE)

#include "mbedtls/config.h"

#else

#include MBEDTLS_CONFIG_FILE

#endif

#if defined(MBEDTLS_PKCS12_C)

#include "mbedtls/pkcs12.h"

#include "mbedtls/asn1.h"

#include "mbedtls/cipher.h"

#include "mbedtls/platform_util.h"

#include 

#if defined(MBEDTLS_ARC4_C)

#include "mbedtls/arc4.h"

#endif

#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;

    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_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_ERR_PKCS12_PBE_INVALID_FORMAT + ret );

    salt->p = *p;

    *p += salt->len;

    if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )

        return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );

    if( *p != end )

        return( 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_sha1_rc4_128( mbedtls_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(MBEDTLS_ARC4_C)

    ((void) pbe_params);

    ((void) mode);

    ((void) pwd);

    ((void) pwdlen);

    ((void) data);

    ((void) len);

    ((void) output);

    return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );

#else

    int ret;

    unsigned char key[16];

    mbedtls_arc4_context ctx;

    ((void) mode);

    mbedtls_arc4_init( &ctx );

    if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,

                                          pwd, pwdlen,

                                          key, 16, NULL, 0 ) ) != 0 )

    {

        return( ret );

    }

    mbedtls_arc4_setup( &ctx, key, 16 );

    if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )

        goto exit;

exit:

    mbedtls_platform_zeroize( key, sizeof( key ) );

    mbedtls_arc4_free( &ctx );

    return( ret );

#endif /* MBEDTLS_ARC4_C */

}

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;

    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;

    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 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;

    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;

    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 );

    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 );

    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 = mbedtls_md_starts( &md_ctx ) ) != 0 )

            goto exit;

        if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )

            goto exit;

        if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )

            goto exit;

        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;

        // 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:

    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 */