crypto/pkcs12/p12_key.c

   1 /* p12_key.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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
  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         if(!pass) {
  85                 unipass = NULL;
  86                 uniplen = 0;
  87         } else if (!asc2uni(pass, passlen, &unipass, &uniplen)) {
  88                 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
  89                 return 0;
  90         }
  91         ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
  92                                                  id, iter, n, out, md_type);
  93         if(unipass) {
  94                 memset(unipass, 0, uniplen);    /* Clear password from memory */
  95                 OPENSSL_free(unipass);
  96         }
  97         return ret;
  98 }
  99
 100 int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
 101              int saltlen, int id, int iter, int n, unsigned char *out,
 102              const EVP_MD *md_type)
 103 {
 104         unsigned char *B, *D, *I, *p, *Ai;
 105         int Slen, Plen, Ilen, Ijlen;
 106         int i, j, u, v;
 107         BIGNUM *Ij, *Bpl1;      /* These hold Ij and B + 1 */
 108         EVP_MD_CTX ctx;
 109 #ifdef  DEBUG_KEYGEN
 110         unsigned char *tmpout = out;
 111         int tmpn = n;
 112 #endif
 113
 114 #if 0
 115         if (!pass) {
 116                 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
 117                 return 0;
 118         }
 119 #endif
 120
 121         EVP_MD_CTX_init(&ctx);
 122 #ifdef  DEBUG_KEYGEN
 123         fprintf(stderr, "KEYGEN DEBUG\n");
 124         fprintf(stderr, "ID %d, ITER %d\n", id, iter);
 125         fprintf(stderr, "Password (length %d):\n", passlen);
 126         h__dump(pass, passlen);
 127         fprintf(stderr, "Salt (length %d):\n", saltlen);
 128         h__dump(salt, saltlen);
 129 #endif
 130         v = EVP_MD_block_size (md_type);
 131         u = EVP_MD_size (md_type);
 132         D = OPENSSL_malloc (v);
 133         Ai = OPENSSL_malloc (u);
 134         B = OPENSSL_malloc (v + 1);
 135         Slen = v * ((saltlen+v-1)/v);
 136         if(passlen) Plen = v * ((passlen+v-1)/v);
 137         else Plen = 0;
 138         Ilen = Slen + Plen;
 139         I = OPENSSL_malloc (Ilen);
 140         Ij = BN_new();
 141         Bpl1 = BN_new();
 142         if (!D || !Ai || !B || !I || !Ij || !Bpl1) {
 143                 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
 144                 return 0;
 145         }
 146         for (i = 0; i < v; i++) D[i] = id;
 147         p = I;
 148         for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
 149         for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
 150         for (;;) {
 151                 EVP_DigestInit_ex(&ctx, md_type, NULL);
 152                 EVP_DigestUpdate(&ctx, D, v);
 153                 EVP_DigestUpdate(&ctx, I, Ilen);
 154                 EVP_DigestFinal_ex(&ctx, Ai, NULL);
 155                 for (j = 1; j < iter; j++) {
 156                         EVP_DigestInit_ex(&ctx, md_type, NULL);
 157                         EVP_DigestUpdate(&ctx, Ai, u);
 158                         EVP_DigestFinal_ex(&ctx, Ai, NULL);
 159                 }
 160                 memcpy (out, Ai, min (n, u));
 161                 if (u >= n) {
 162                         OPENSSL_free (Ai);
 163                         OPENSSL_free (B);
 164                         OPENSSL_free (D);
 165                         OPENSSL_free (I);
 166                         BN_free (Ij);
 167                         BN_free (Bpl1);
 168 #ifdef DEBUG_KEYGEN
 169                         fprintf(stderr, "Output KEY (length %d)\n", tmpn);
 170                         h__dump(tmpout, tmpn);
 171 #endif
 172                         return 1;
 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                 BN_bin2bn (B, v, Bpl1);
 179                 BN_add_word (Bpl1, 1);
 180                 for (j = 0; j < Ilen ; j+=v) {
 181                         BN_bin2bn (I + j, v, Ij);
 182                         BN_add (Ij, Ij, Bpl1);
 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         EVP_MD_CTX_cleanup(&ctx);
 199 }
 200 #ifdef DEBUG_KEYGEN
 201 void h__dump (unsigned char *p, int len)
 202 {
 203         for (; len --; p++) fprintf(stderr, "%02X", *p);
 204         fprintf(stderr, "\n");
 205 }
 206 #endif