p12_key.c 6.74 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
/* p12_key.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/pkcs12.h>
#include <openssl/bn.h>

/* Uncomment out this line to get debugging info about key generation */
/*#define DEBUG_KEYGEN*/
#ifdef DEBUG_KEYGEN
#include <openssl/bio.h>
extern BIO *bio_err;
void h__dump (unsigned char *p, int len);
#endif

/* PKCS12 compatible key/IV generation */
#ifndef min
#define min(a,b) ((a) < (b) ? (a) : (b))
#endif

int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
	     int saltlen, int id, int iter, int n, unsigned char *out,
	     const EVP_MD *md_type)
{
	int ret;
	unsigned char *unipass;
	int uniplen;

	if(!pass) {
		unipass = NULL;
		uniplen = 0;
	} else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
						 id, iter, n, out, md_type);
	if (ret <= 0)
	    return 0;
	if(unipass) {
		OPENSSL_cleanse(unipass, uniplen);	/* Clear password from memory */
		OPENSSL_free(unipass);
	}
	return ret;
}

int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
	     int saltlen, int id, int iter, int n, unsigned char *out,
	     const EVP_MD *md_type)
{
	unsigned char *B, *D, *I, *p, *Ai;
	int Slen, Plen, Ilen, Ijlen;
	int i, j, u, v;
	int ret = 0;
	BIGNUM *Ij, *Bpl1;	/* These hold Ij and B + 1 */
	EVP_MD_CTX ctx;
#ifdef  DEBUG_KEYGEN
	unsigned char *tmpout = out;
	int tmpn = n;
#endif

#if 0
	if (!pass) {
		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
#endif

	EVP_MD_CTX_init(&ctx);
#ifdef  DEBUG_KEYGEN
	fprintf(stderr, "KEYGEN DEBUG\n");
	fprintf(stderr, "ID %d, ITER %d\n", id, iter);
	fprintf(stderr, "Password (length %d):\n", passlen);
	h__dump(pass, passlen);
	fprintf(stderr, "Salt (length %d):\n", saltlen);
	h__dump(salt, saltlen);
#endif
	v = EVP_MD_block_size (md_type);
	u = EVP_MD_size (md_type);
	if (u < 0)
	    return 0;
	D = OPENSSL_malloc (v);
	Ai = OPENSSL_malloc (u);
	B = OPENSSL_malloc (v + 1);
	Slen = v * ((saltlen+v-1)/v);
	if(passlen) Plen = v * ((passlen+v-1)/v);
	else Plen = 0;
	Ilen = Slen + Plen;
	I = OPENSSL_malloc (Ilen);
	Ij = BN_new();
	Bpl1 = BN_new();
	if (!D || !Ai || !B || !I || !Ij || !Bpl1)
		goto err;
	for (i = 0; i < v; i++) D[i] = id;
	p = I;
	for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
	for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
	for (;;) {
		if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
			|| !EVP_DigestUpdate(&ctx, D, v)
			|| !EVP_DigestUpdate(&ctx, I, Ilen)
			|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
			goto err;
		for (j = 1; j < iter; j++) {
			if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
				|| !EVP_DigestUpdate(&ctx, Ai, u)
				|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
			goto err;
		}
		memcpy (out, Ai, min (n, u));
		if (u >= n) {
#ifdef DEBUG_KEYGEN
			fprintf(stderr, "Output KEY (length %d)\n", tmpn);
			h__dump(tmpout, tmpn);
#endif
			ret = 1;
			goto end;
		}
		n -= u;
		out += u;
		for (j = 0; j < v; j++) B[j] = Ai[j % u];
		/* Work out B + 1 first then can use B as tmp space */
		if (!BN_bin2bn (B, v, Bpl1))
			goto err;
		if (!BN_add_word (Bpl1, 1))
			goto err;
		for (j = 0; j < Ilen ; j+=v) {
			if (!BN_bin2bn(I + j, v, Ij))
				goto err;
			if (!BN_add(Ij, Ij, Bpl1))
				goto err;
			if (!BN_bn2bin(Ij, B))
				goto err;
			Ijlen = BN_num_bytes (Ij);
			/* If more than 2^(v*8) - 1 cut off MSB */
			if (Ijlen > v) {
				if (!BN_bn2bin (Ij, B))
					goto err;
				memcpy (I + j, B + 1, v);
#ifndef PKCS12_BROKEN_KEYGEN
			/* If less than v bytes pad with zeroes */
			} else if (Ijlen < v) {
				memset(I + j, 0, v - Ijlen);
				if (!BN_bn2bin(Ij, I + j + v - Ijlen))
					goto err;
#endif
			} else if (!BN_bn2bin (Ij, I + j))
				goto err;
		}
	}

err:
	PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);

end:
	OPENSSL_free (Ai);
	OPENSSL_free (B);
	OPENSSL_free (D);
	OPENSSL_free (I);
	BN_free (Ij);
	BN_free (Bpl1);
	EVP_MD_CTX_cleanup(&ctx);
	return ret;
}
#ifdef DEBUG_KEYGEN
void h__dump (unsigned char *p, int len)
{
	for (; len --; p++) fprintf(stderr, "%02X", *p);
	fprintf(stderr, "\n");	
}
#endif