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> 68 extern BIO *bio_err; 69 void h__dump (unsigned char *p, int len); 70 #endif 71 72 /* PKCS12 compatible key/IV generation */ 73 #ifndef min 74 #define min(a,b) ((a) < (b) ? (a) : (b)) 75 #endif 76 77 int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt, 78 int saltlen, int id, int iter, int n, unsigned char *out, 79 const EVP_MD *md_type) 80 { 81 int ret; 82 unsigned char *unipass; 83 int uniplen; 84 85 if(!pass) { 86 unipass = NULL; 87 uniplen = 0; 88 } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) { 89 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE); 90 return 0; 91 } 92 ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen, 93 id, iter, n, out, md_type); 94 if (ret <= 0) 95 return 0; 96 if(unipass) { 97 OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */ 98 OPENSSL_free(unipass); 99 } 100 return ret; 101 } 102 103 int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt, 104 int saltlen, int id, int iter, int n, unsigned char *out, 105 const EVP_MD *md_type) 106 { 107 unsigned char *B, *D, *I, *p, *Ai; 108 int Slen, Plen, Ilen, Ijlen; 109 int i, j, u, v; 110 int ret = 0; 111 BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */ 112 EVP_MD_CTX ctx; 113 #ifdef DEBUG_KEYGEN 114 unsigned char *tmpout = out; 115 int tmpn = n; 116 #endif 117 118 #if 0 119 if (!pass) { 120 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER); 121 return 0; 122 } 123 #endif 124 125 EVP_MD_CTX_init(&ctx); 126 #ifdef DEBUG_KEYGEN 127 fprintf(stderr, "KEYGEN DEBUG\n"); 128 fprintf(stderr, "ID %d, ITER %d\n", id, iter); 129 fprintf(stderr, "Password (length %d):\n", passlen); 130 h__dump(pass, passlen); 131 fprintf(stderr, "Salt (length %d):\n", saltlen); 132 h__dump(salt, saltlen); 133 #endif 134 v = EVP_MD_block_size (md_type); 135 u = EVP_MD_size (md_type); 136 if (u < 0) 137 return 0; 138 D = OPENSSL_malloc (v); 139 Ai = OPENSSL_malloc (u); 140 B = OPENSSL_malloc (v + 1); 141 Slen = v * ((saltlen+v-1)/v); 142 if(passlen) Plen = v * ((passlen+v-1)/v); 143 else Plen = 0; 144 Ilen = Slen + Plen; 145 I = OPENSSL_malloc (Ilen); 146 Ij = BN_new(); 147 Bpl1 = BN_new(); 148 if (!D || !Ai || !B || !I || !Ij || !Bpl1) 149 goto err; 150 for (i = 0; i < v; i++) D[i] = id; 151 p = I; 152 for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen]; 153 for (i = 0; i < Plen; i++) *p++ = pass[i % passlen]; 154 for (;;) { 155 if (!EVP_DigestInit_ex(&ctx, md_type, NULL) 156 || !EVP_DigestUpdate(&ctx, D, v) 157 || !EVP_DigestUpdate(&ctx, I, Ilen) 158 || !EVP_DigestFinal_ex(&ctx, Ai, NULL)) 159 goto err; 160 for (j = 1; j < iter; j++) { 161 if (!EVP_DigestInit_ex(&ctx, md_type, NULL) 162 || !EVP_DigestUpdate(&ctx, Ai, u) 163 || !EVP_DigestFinal_ex(&ctx, Ai, NULL)) 164 goto err; 165 } 166 memcpy (out, Ai, min (n, u)); 167 if (u >= n) { 168 #ifdef DEBUG_KEYGEN 169 fprintf(stderr, "Output KEY (length %d)\n", tmpn); 170 h__dump(tmpout, tmpn); 171 #endif 172 ret = 1; 173 goto end; 174 } 175 n -= u; 176 out += u; 177 for (j = 0; j < v; j++) B[j] = Ai[j % u]; 178 /* Work out B + 1 first then can use B as tmp space */ 179 if (!BN_bin2bn (B, v, Bpl1)) 180 goto err; 181 if (!BN_add_word (Bpl1, 1)) 182 goto err; 183 for (j = 0; j < Ilen ; j+=v) { 184 if (!BN_bin2bn(I + j, v, Ij)) 185 goto err; 186 if (!BN_add(Ij, Ij, Bpl1)) 187 goto err; 188 if (!BN_bn2bin(Ij, B)) 189 goto err; 190 Ijlen = BN_num_bytes (Ij); 191 /* If more than 2^(v*8) - 1 cut off MSB */ 192 if (Ijlen > v) { 193 if (!BN_bn2bin (Ij, B)) 194 goto err; 195 memcpy (I + j, B + 1, v); 196 #ifndef PKCS12_BROKEN_KEYGEN 197 /* If less than v bytes pad with zeroes */ 198 } else if (Ijlen < v) { 199 memset(I + j, 0, v - Ijlen); 200 if (!BN_bn2bin(Ij, I + j + v - Ijlen)) 201 goto err; 202 #endif 203 } else if (!BN_bn2bin (Ij, I + j)) 204 goto err; 205 } 206 } 207 208 err: 209 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE); 210 211 end: 212 OPENSSL_free (Ai); 213 OPENSSL_free (B); 214 OPENSSL_free (D); 215 OPENSSL_free (I); 216 BN_free (Ij); 217 BN_free (Bpl1); 218 EVP_MD_CTX_cleanup(&ctx); 219 return ret; 220 } 221 #ifdef DEBUG_KEYGEN 222 void h__dump (unsigned char *p, int len) 223 { 224 for (; len --; p++) fprintf(stderr, "%02X", *p); 225 fprintf(stderr, "\n"); 226 } 227 #endif 228