crypto/pkcs12/p12_key.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 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 "internal/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 /*
  66  * #define OPENSSL_DEBUG_KEYGEN
  67  */
  68 #ifdef OPENSSL_DEBUG_KEYGEN
  69 # include <openssl/bio.h>
  70 extern BIO *bio_err;
  71 void h__dump(unsigned char *p, int len);
  72 #endif
  73
  74 /* PKCS12 compatible key/IV generation */
  75 #ifndef min
  76 # define min(a,b) ((a) < (b) ? (a) : (b))
  77 #endif
  78
  79 int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
  80                        int saltlen, int id, int iter, int n,
  81                        unsigned char *out, const EVP_MD *md_type)
  82 {
  83     int ret;
  84     unsigned char *unipass;
  85     int uniplen;
  86
  87     if (!pass) {
  88         unipass = NULL;
  89         uniplen = 0;
  90     } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
  91         PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
  92         return 0;
  93     }
  94     ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
  95                              id, iter, n, out, md_type);
  96     if (ret <= 0)
  97         return 0;
  98     OPENSSL_clear_free(unipass, uniplen);
  99     return ret;
 100 }
 101
 102 int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
 103                        int saltlen, int id, int iter, int n,
 104                        unsigned char *out, const EVP_MD *md_type)
 105 {
 106     unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL;
 107     int Slen, Plen, Ilen, Ijlen;
 108     int i, j, u, v;
 109     int ret = 0;
 110     BIGNUM *Ij = NULL, *Bpl1 = NULL; /* These hold Ij and B + 1 */
 111     EVP_MD_CTX *ctx = NULL;
 112 #ifdef  OPENSSL_DEBUG_KEYGEN
 113     unsigned char *tmpout = out;
 114     int tmpn = n;
 115 #endif
 116
 117     ctx = EVP_MD_CTX_new();
 118     if (ctx == NULL)
 119         goto err;
 120
 121 #ifdef  OPENSSL_DEBUG_KEYGEN
 122     fprintf(stderr, "KEYGEN DEBUG\n");
 123     fprintf(stderr, "ID %d, ITER %d\n", id, iter);
 124     fprintf(stderr, "Password (length %d):\n", passlen);
 125     h__dump(pass, passlen);
 126     fprintf(stderr, "Salt (length %d):\n", saltlen);
 127     h__dump(salt, saltlen);
 128 #endif
 129     v = EVP_MD_block_size(md_type);
 130     u = EVP_MD_size(md_type);
 131     if (u < 0 || v <= 0)
 132         goto err;
 133     D = OPENSSL_malloc(v);
 134     Ai = OPENSSL_malloc(u);
 135     B = OPENSSL_malloc(v + 1);
 136     Slen = v * ((saltlen + v - 1) / v);
 137     if (passlen)
 138         Plen = v * ((passlen + v - 1) / v);
 139     else
 140         Plen = 0;
 141     Ilen = Slen + Plen;
 142     I = OPENSSL_malloc(Ilen);
 143     Ij = BN_new();
 144     Bpl1 = BN_new();
 145     if (D == NULL || Ai == NULL || B == NULL || I == NULL || Ij == NULL
 146             || Bpl1 == NULL)
 147         goto err;
 148     for (i = 0; i < v; i++)
 149         D[i] = id;
 150     p = I;
 151     for (i = 0; i < Slen; i++)
 152         *p++ = salt[i % saltlen];
 153     for (i = 0; i < Plen; i++)
 154         *p++ = pass[i % passlen];
 155     for (;;) {
 156         if (!EVP_DigestInit_ex(ctx, md_type, NULL)
 157             || !EVP_DigestUpdate(ctx, D, v)
 158             || !EVP_DigestUpdate(ctx, I, Ilen)
 159             || !EVP_DigestFinal_ex(ctx, Ai, NULL))
 160             goto err;
 161         for (j = 1; j < iter; j++) {
 162             if (!EVP_DigestInit_ex(ctx, md_type, NULL)
 163                 || !EVP_DigestUpdate(ctx, Ai, u)
 164                 || !EVP_DigestFinal_ex(ctx, Ai, NULL))
 165                 goto err;
 166         }
 167         memcpy(out, Ai, min(n, u));
 168         if (u >= n) {
 169 #ifdef OPENSSL_DEBUG_KEYGEN
 170             fprintf(stderr, "Output KEY (length %d)\n", tmpn);
 171             h__dump(tmpout, tmpn);
 172 #endif
 173             ret = 1;
 174             goto end;
 175         }
 176         n -= u;
 177         out += u;
 178         for (j = 0; j < v; j++)
 179             B[j] = Ai[j % u];
 180         /* Work out B + 1 first then can use B as tmp space */
 181         if (!BN_bin2bn(B, v, Bpl1))
 182             goto err;
 183         if (!BN_add_word(Bpl1, 1))
 184             goto err;
 185         for (j = 0; j < Ilen; j += v) {
 186             if (!BN_bin2bn(I + j, v, Ij))
 187                 goto err;
 188             if (!BN_add(Ij, Ij, Bpl1))
 189                 goto err;
 190             if (!BN_bn2bin(Ij, B))
 191                 goto err;
 192             Ijlen = BN_num_bytes(Ij);
 193             /* If more than 2^(v*8) - 1 cut off MSB */
 194             if (Ijlen > v) {
 195                 if (!BN_bn2bin(Ij, B))
 196                     goto err;
 197                 memcpy(I + j, B + 1, v);
 198 #ifndef PKCS12_BROKEN_KEYGEN
 199                 /* If less than v bytes pad with zeroes */
 200             } else if (Ijlen < v) {
 201                 memset(I + j, 0, v - Ijlen);
 202                 if (!BN_bn2bin(Ij, I + j + v - Ijlen))
 203                     goto err;
 204 #endif
 205             } else if (!BN_bn2bin(Ij, I + j))
 206                 goto err;
 207         }
 208     }
 209
 210  err:
 211     PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
 212
 213  end:
 214     OPENSSL_free(Ai);
 215     OPENSSL_free(B);
 216     OPENSSL_free(D);
 217     OPENSSL_free(I);
 218     BN_free(Ij);
 219     BN_free(Bpl1);
 220     EVP_MD_CTX_free(ctx);
 221     return ret;
 222 }
 223
 224 #ifdef OPENSSL_DEBUG_KEYGEN
 225 void h__dump(unsigned char *p, int len)
 226 {
 227     for (; len--; p++)
 228         fprintf(stderr, "%02X", *p);
 229     fprintf(stderr, "\n");
 230 }
 231 #endif