crypto/libressl/crypto/pkcs12/p12_key.c

   1 /* $OpenBSD: p12_key.c,v 1.22 2015/02/07 13:19:15 doug Exp $ */
   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 <string.h>
  61
  62 #include <openssl/bn.h>
  63 #include <openssl/err.h>
  64 #include <openssl/pkcs12.h>
  65
  66 /* PKCS12 compatible key/IV generation */
  67 #ifndef min
  68 #define min(a,b) ((a) < (b) ? (a) : (b))
  69 #endif
  70
  71 int
  72 PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
  73     int saltlen, int id, int iter, int n, unsigned char *out,
  74     const EVP_MD *md_type)
  75 {
  76         int ret;
  77         unsigned char *unipass;
  78         int uniplen;
  79
  80         if (!pass) {
  81                 unipass = NULL;
  82                 uniplen = 0;
  83         } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
  84                 PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
  85                 return 0;
  86         }
  87         ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
  88             id, iter, n, out, md_type);
  89         if (ret <= 0)
  90                 return 0;
  91         if (unipass) {
  92                 explicit_bzero(unipass, uniplen);
  93                 free(unipass);
  94         }
  95         return ret;
  96 }
  97
  98 int
  99 PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
 100     int saltlen, int id, int iter, int n, unsigned char *out,
 101     const EVP_MD *md_type)
 102 {
 103         unsigned char *B, *D, *I, *p, *Ai;
 104         int Slen, Plen, Ilen, Ijlen;
 105         int i, j, u, v;
 106         int ret = 0;
 107         BIGNUM *Ij, *Bpl1;      /* These hold Ij and B + 1 */
 108         EVP_MD_CTX ctx;
 109
 110         EVP_MD_CTX_init(&ctx);
 111         v = EVP_MD_block_size(md_type);
 112         u = EVP_MD_size(md_type);
 113         if (u < 0)
 114                 return 0;
 115         D = malloc(v);
 116         Ai = malloc(u);
 117         B = malloc(v + 1);
 118         Slen = v * ((saltlen + v - 1) / v);
 119         if (passlen)
 120                 Plen = v * ((passlen + v - 1)/v);
 121         else
 122                 Plen = 0;
 123         Ilen = Slen + Plen;
 124         I = malloc(Ilen);
 125         Ij = BN_new();
 126         Bpl1 = BN_new();
 127         if (!D || !Ai || !B || !I || !Ij || !Bpl1)
 128                 goto err;
 129         for (i = 0; i < v; i++)
 130                 D[i] = id;
 131         p = I;
 132         for (i = 0; i < Slen; i++)
 133                 *p++ = salt[i % saltlen];
 134         for (i = 0; i < Plen; i++)
 135                 *p++ = pass[i % passlen];
 136         for (;;) {
 137                 if (!EVP_DigestInit_ex(&ctx, md_type, NULL) ||
 138                     !EVP_DigestUpdate(&ctx, D, v) ||
 139                     !EVP_DigestUpdate(&ctx, I, Ilen) ||
 140                     !EVP_DigestFinal_ex(&ctx, Ai, NULL))
 141                         goto err;
 142                 for (j = 1; j < iter; j++) {
 143                         if (!EVP_DigestInit_ex(&ctx, md_type, NULL) ||
 144                             !EVP_DigestUpdate(&ctx, Ai, u) ||
 145                             !EVP_DigestFinal_ex(&ctx, Ai, NULL))
 146                                 goto err;
 147                 }
 148                 memcpy (out, Ai, min (n, u));
 149                 if (u >= n) {
 150                         ret = 1;
 151                         goto end;
 152                 }
 153                 n -= u;
 154                 out += u;
 155                 for (j = 0; j < v; j++)
 156                         B[j] = Ai[j % u];
 157                 /* Work out B + 1 first then can use B as tmp space */
 158                 if (!BN_bin2bn (B, v, Bpl1))
 159                         goto err;
 160                 if (!BN_add_word (Bpl1, 1))
 161                         goto err;
 162                 for (j = 0; j < Ilen; j += v) {
 163                         if (!BN_bin2bn(I + j, v, Ij))
 164                                 goto err;
 165                         if (!BN_add(Ij, Ij, Bpl1))
 166                                 goto err;
 167                         if (!BN_bn2bin(Ij, B))
 168                                 goto err;
 169                         Ijlen = BN_num_bytes (Ij);
 170                         /* If more than 2^(v*8) - 1 cut off MSB */
 171                         if (Ijlen > v) {
 172                                 if (!BN_bn2bin (Ij, B))
 173                                         goto err;
 174                                 memcpy (I + j, B + 1, v);
 175 #ifndef PKCS12_BROKEN_KEYGEN
 176                                 /* If less than v bytes pad with zeroes */
 177                         } else if (Ijlen < v) {
 178                                 memset(I + j, 0, v - Ijlen);
 179                                 if (!BN_bn2bin(Ij, I + j + v - Ijlen))
 180                                         goto err;
 181 #endif
 182                         } else if (!BN_bn2bin (Ij, I + j))
 183                                 goto err;
 184                 }
 185         }
 186
 187 err:
 188         PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
 189
 190 end:
 191         free(Ai);
 192         free(B);
 193         free(D);
 194         free(I);
 195         BN_free(Ij);
 196         BN_free(Bpl1);
 197         EVP_MD_CTX_cleanup(&ctx);
 198         return ret;
 199 }