1 /* p12_key.c */ 2 /* 3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 4 * 1999. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60 #include <stdio.h> 61 #include "cryptlib.h" 62 #include <openssl/pkcs12.h> 63 #include <openssl/bn.h> 64 65 /* Uncomment out this line to get debugging info about key generation */ 66 /* 67 * #define DEBUG_KEYGEN 68 */ 69 #ifdef DEBUG_KEYGEN 70 # include <openssl/bio.h> 71 extern BIO *bio_err; 72 void h__dump(unsigned char *p, int len); 73 #endif 74 75 /* PKCS12 compatible key/IV generation */ 76 #ifndef min 77 # define min(a,b) ((a) < (b) ? (a) : (b)) 78 #endif 79 80 int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt, 81 int saltlen, int id, int iter, int n, 82 unsigned char *out, const EVP_MD *md_type) 83 { 84 int ret; 85 unsigned char *unipass; 86 int uniplen; 87 88 if (!pass) { 89 unipass = NULL; 90 uniplen = 0; 91 } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) { 92 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE); 93 return 0; 94 } 95 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen, 96 id, iter, n, out, md_type); 97 if (ret <= 0) 98 return 0; 99 if (unipass) { 100 OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */ 101 OPENSSL_free(unipass); 102 } 103 return ret; 104 } 105 106 int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt, 107 int saltlen, int id, int iter, int n, 108 unsigned char *out, 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 if (u < 0) 140 return 0; 141 D = OPENSSL_malloc(v); 142 Ai = OPENSSL_malloc(u); 143 B = OPENSSL_malloc(v + 1); 144 Slen = v * ((saltlen + v - 1) / v); 145 if (passlen) 146 Plen = v * ((passlen + v - 1) / v); 147 else 148 Plen = 0; 149 Ilen = Slen + Plen; 150 I = OPENSSL_malloc(Ilen); 151 Ij = BN_new(); 152 Bpl1 = BN_new(); 153 if (!D || !Ai || !B || !I || !Ij || !Bpl1) 154 goto err; 155 for (i = 0; i < v; i++) 156 D[i] = id; 157 p = I; 158 for (i = 0; i < Slen; i++) 159 *p++ = salt[i % saltlen]; 160 for (i = 0; i < Plen; i++) 161 *p++ = pass[i % passlen]; 162 for (;;) { 163 if (!EVP_DigestInit_ex(&ctx, md_type, NULL) 164 || !EVP_DigestUpdate(&ctx, D, v) 165 || !EVP_DigestUpdate(&ctx, I, Ilen) 166 || !EVP_DigestFinal_ex(&ctx, Ai, NULL)) 167 goto err; 168 for (j = 1; j < iter; j++) { 169 if (!EVP_DigestInit_ex(&ctx, md_type, NULL) 170 || !EVP_DigestUpdate(&ctx, Ai, u) 171 || !EVP_DigestFinal_ex(&ctx, Ai, NULL)) 172 goto err; 173 } 174 memcpy(out, Ai, min(n, u)); 175 if (u >= n) { 176 #ifdef DEBUG_KEYGEN 177 fprintf(stderr, "Output KEY (length %d)\n", tmpn); 178 h__dump(tmpout, tmpn); 179 #endif 180 ret = 1; 181 goto end; 182 } 183 n -= u; 184 out += u; 185 for (j = 0; j < v; j++) 186 B[j] = Ai[j % u]; 187 /* Work out B + 1 first then can use B as tmp space */ 188 if (!BN_bin2bn(B, v, Bpl1)) 189 goto err; 190 if (!BN_add_word(Bpl1, 1)) 191 goto err; 192 for (j = 0; j < Ilen; j += v) { 193 if (!BN_bin2bn(I + j, v, Ij)) 194 goto err; 195 if (!BN_add(Ij, Ij, Bpl1)) 196 goto err; 197 if (!BN_bn2bin(Ij, B)) 198 goto err; 199 Ijlen = BN_num_bytes(Ij); 200 /* If more than 2^(v*8) - 1 cut off MSB */ 201 if (Ijlen > v) { 202 if (!BN_bn2bin(Ij, B)) 203 goto err; 204 memcpy(I + j, B + 1, v); 205 #ifndef PKCS12_BROKEN_KEYGEN 206 /* If less than v bytes pad with zeroes */ 207 } else if (Ijlen < v) { 208 memset(I + j, 0, v - Ijlen); 209 if (!BN_bn2bin(Ij, I + j + v - Ijlen)) 210 goto err; 211 #endif 212 } else if (!BN_bn2bin(Ij, I + j)) 213 goto err; 214 } 215 } 216 217 err: 218 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE); 219 220 end: 221 OPENSSL_free(Ai); 222 OPENSSL_free(B); 223 OPENSSL_free(D); 224 OPENSSL_free(I); 225 BN_free(Ij); 226 BN_free(Bpl1); 227 EVP_MD_CTX_cleanup(&ctx); 228 return ret; 229 } 230 231 #ifdef DEBUG_KEYGEN 232 void h__dump(unsigned char *p, int len) 233 { 234 for (; len--; p++) 235 fprintf(stderr, "%02X", *p); 236 fprintf(stderr, "\n"); 237 } 238 #endif 239