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pkcs12.c revision 1.1 
      1 /*	$NetBSD: pkcs12.c,v 1.1 2011/04/13 18:14:50 elric Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <config.h>
     37 
     38 #include <stdio.h>
     39 #include <stdlib.h>
     40 #include <assert.h>
     41 
     42 #include <pkcs12.h>
     43 #include <bn.h>
     44 
     45 #include <krb5/roken.h>
     46 
     47 int
     48 PKCS12_key_gen(const void *key, size_t keylen,
     49 	       const void *salt, size_t saltlen,
     50 	       int id, int iteration, size_t outkeysize,
     51 	       void *out, const EVP_MD *md)
     52 {
     53     unsigned char *v, *I, hash[EVP_MAX_MD_SIZE];
     54     unsigned int size, size_I = 0;
     55     unsigned char idc = id;
     56     EVP_MD_CTX *ctx;
     57     unsigned char *outp = out;
     58     int i, vlen;
     59 
     60     ctx = EVP_MD_CTX_create();
     61     if (ctx == NULL)
     62 	return 0;
     63 
     64     vlen = EVP_MD_block_size(md);
     65     v = malloc(vlen + 1);
     66     if (v == NULL) {
     67 	EVP_MD_CTX_destroy(ctx);
     68 	return 0;
     69     }
     70 
     71     I = calloc(1, vlen * 2);
     72     if (I == NULL) {
     73 	EVP_MD_CTX_destroy(ctx);
     74 	free(v);
     75 	return 0;
     76     }
     77 
     78     if (salt && saltlen > 0) {
     79 	for (i = 0; i < vlen; i++)
     80 	    I[i] = ((unsigned char*)salt)[i % saltlen];
     81 	size_I += vlen;
     82     }
     83     /*
     84      * There is a diffrence between the no password string and the
     85      * empty string, in the empty string the UTF16 NUL terminator is
     86      * included into the string.
     87      */
     88     if (key && keylen >= 0) {
     89 	for (i = 0; i < vlen / 2; i++) {
     90 	    I[(i * 2) + size_I] = 0;
     91 	    I[(i * 2) + size_I + 1] = ((unsigned char*)key)[i % (keylen + 1)];
     92 	}
     93 	size_I += vlen;
     94     }
     95 
     96     while (1) {
     97 	BIGNUM *bnB, *bnOne;
     98 
     99 	if (!EVP_DigestInit_ex(ctx, md, NULL)) {
    100 	    EVP_MD_CTX_destroy(ctx);
    101 	    free(I);
    102 	    free(v);
    103 	    return 0;
    104 	}
    105 	for (i = 0; i < vlen; i++)
    106 	    EVP_DigestUpdate(ctx, &idc, 1);
    107 	EVP_DigestUpdate(ctx, I, size_I);
    108 	EVP_DigestFinal_ex(ctx, hash, &size);
    109 
    110 	for (i = 1; i < iteration; i++)
    111 	    EVP_Digest(hash, size, hash, &size, md, NULL);
    112 
    113 	memcpy(outp, hash, min(outkeysize, size));
    114 	if (outkeysize < size)
    115 	    break;
    116 	outkeysize -= size;
    117 	outp += size;
    118 
    119 	for (i = 0; i < vlen; i++)
    120 	    v[i] = hash[i % size];
    121 
    122 	bnB = BN_bin2bn(v, vlen, NULL);
    123 	bnOne = BN_new();
    124 	BN_set_word(bnOne, 1);
    125 
    126 	BN_uadd(bnB, bnB, bnOne);
    127 
    128 	for (i = 0; i < vlen * 2; i += vlen) {
    129 	    BIGNUM *bnI;
    130 	    int j;
    131 
    132 	    bnI = BN_bin2bn(I + i, vlen, NULL);
    133 
    134 	    BN_uadd(bnI, bnI, bnB);
    135 
    136 	    j = BN_num_bytes(bnI);
    137 	    if (j > vlen) {
    138 		assert(j == vlen + 1);
    139 		BN_bn2bin(bnI, v);
    140 		memcpy(I + i, v + 1, vlen);
    141 	    } else {
    142 		memset(I + i, 0, vlen - j);
    143 		BN_bn2bin(bnI, I + i + vlen - j);
    144 	    }
    145 	    BN_free(bnI);
    146 	}
    147 	BN_free(bnB);
    148 	BN_free(bnOne);
    149 	size_I = vlen * 2;
    150     }
    151 
    152     EVP_MD_CTX_destroy(ctx);
    153     free(I);
    154     free(v);
    155 
    156     return 1;
    157 }
    158