Cryptlib/OpenSSL/crypto/pkcs12/p12_key.c

   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