p12_key.c revision 225736
1/* p12_key.c */ 2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 1999. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. 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 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59#include <stdio.h> 60#include "cryptlib.h" 61#include <openssl/pkcs12.h> 62#include <openssl/bn.h> 63 64/* Uncomment out this line to get debugging info about key generation */ 65/*#define DEBUG_KEYGEN*/ 66#ifdef DEBUG_KEYGEN 67#include <openssl/bio.h> 68extern BIO *bio_err; 69void h__dump (unsigned char *p, int len); 70#endif 71 72#ifdef OPENSSL_SYS_NETWARE 73/* Rename these functions to avoid name clashes on NetWare OS */ 74#define uni2asc OPENSSL_uni2asc 75#define asc2uni OPENSSL_asc2uni 76#endif 77 78/* PKCS12 compatible key/IV generation */ 79#ifndef min 80#define min(a,b) ((a) < (b) ? (a) : (b)) 81#endif 82 83int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt, 84 int saltlen, int id, int iter, int n, unsigned char *out, 85 const EVP_MD *md_type) 86{ 87 int ret; 88 unsigned char *unipass; 89 int uniplen; 90 if(!pass) { 91 unipass = NULL; 92 uniplen = 0; 93 } else if (!asc2uni(pass, passlen, &unipass, &uniplen)) { 94 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE); 95 return 0; 96 } 97 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen, 98 id, iter, n, out, md_type); 99 if(unipass) { 100 OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */ 101 OPENSSL_free(unipass); 102 } 103 return ret; 104} 105 106int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt, 107 int saltlen, int id, int iter, int n, unsigned char *out, 108 const EVP_MD *md_type) 109{ 110 unsigned char *B, *D, *I, *p, *Ai; 111 int Slen, Plen, Ilen, Ijlen; 112 int i, j, u, v; 113 int ret = 0; 114 BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */ 115 EVP_MD_CTX ctx; 116#ifdef DEBUG_KEYGEN 117 unsigned char *tmpout = out; 118 int tmpn = n; 119#endif 120 121#if 0 122 if (!pass) { 123 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER); 124 return 0; 125 } 126#endif 127 128 EVP_MD_CTX_init(&ctx); 129#ifdef DEBUG_KEYGEN 130 fprintf(stderr, "KEYGEN DEBUG\n"); 131 fprintf(stderr, "ID %d, ITER %d\n", id, iter); 132 fprintf(stderr, "Password (length %d):\n", passlen); 133 h__dump(pass, passlen); 134 fprintf(stderr, "Salt (length %d):\n", saltlen); 135 h__dump(salt, saltlen); 136#endif 137 v = EVP_MD_block_size (md_type); 138 u = EVP_MD_size (md_type); 139 D = OPENSSL_malloc (v); 140 Ai = OPENSSL_malloc (u); 141 B = OPENSSL_malloc (v + 1); 142 Slen = v * ((saltlen+v-1)/v); 143 if(passlen) Plen = v * ((passlen+v-1)/v); 144 else Plen = 0; 145 Ilen = Slen + Plen; 146 I = OPENSSL_malloc (Ilen); 147 Ij = BN_new(); 148 Bpl1 = BN_new(); 149 if (!D || !Ai || !B || !I || !Ij || !Bpl1) 150 goto err; 151 for (i = 0; i < v; i++) D[i] = id; 152 p = I; 153 for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen]; 154 for (i = 0; i < Plen; i++) *p++ = pass[i % passlen]; 155 for (;;) { 156 EVP_DigestInit_ex(&ctx, md_type, NULL); 157 EVP_DigestUpdate(&ctx, D, v); 158 EVP_DigestUpdate(&ctx, I, Ilen); 159 EVP_DigestFinal_ex(&ctx, Ai, NULL); 160 for (j = 1; j < iter; j++) { 161 EVP_DigestInit_ex(&ctx, md_type, NULL); 162 EVP_DigestUpdate(&ctx, Ai, u); 163 EVP_DigestFinal_ex(&ctx, Ai, NULL); 164 } 165 memcpy (out, Ai, min (n, u)); 166 if (u >= n) { 167#ifdef DEBUG_KEYGEN 168 fprintf(stderr, "Output KEY (length %d)\n", tmpn); 169 h__dump(tmpout, tmpn); 170#endif 171 ret = 1; 172 goto end; 173 } 174 n -= u; 175 out += u; 176 for (j = 0; j < v; j++) B[j] = Ai[j % u]; 177 /* Work out B + 1 first then can use B as tmp space */ 178 if (!BN_bin2bn (B, v, Bpl1)) goto err; 179 if (!BN_add_word (Bpl1, 1)) goto err; 180 for (j = 0; j < Ilen ; j+=v) { 181 if (!BN_bin2bn (I + j, v, Ij)) goto err; 182 if (!BN_add (Ij, Ij, Bpl1)) goto err; 183 BN_bn2bin (Ij, B); 184 Ijlen = BN_num_bytes (Ij); 185 /* If more than 2^(v*8) - 1 cut off MSB */ 186 if (Ijlen > v) { 187 BN_bn2bin (Ij, B); 188 memcpy (I + j, B + 1, v); 189#ifndef PKCS12_BROKEN_KEYGEN 190 /* If less than v bytes pad with zeroes */ 191 } else if (Ijlen < v) { 192 memset(I + j, 0, v - Ijlen); 193 BN_bn2bin(Ij, I + j + v - Ijlen); 194#endif 195 } else BN_bn2bin (Ij, I + j); 196 } 197 } 198 199err: 200 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE); 201 202end: 203 OPENSSL_free (Ai); 204 OPENSSL_free (B); 205 OPENSSL_free (D); 206 OPENSSL_free (I); 207 BN_free (Ij); 208 BN_free (Bpl1); 209 EVP_MD_CTX_cleanup(&ctx); 210 return ret; 211} 212#ifdef DEBUG_KEYGEN 213void h__dump (unsigned char *p, int len) 214{ 215 for (; len --; p++) fprintf(stderr, "%02X", *p); 216 fprintf(stderr, "\n"); 217} 218#endif 219