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 "internal/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     OPENSSL_clear_free(unipass, uniplen);
 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,
 105                        unsigned char *out, 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     EVP_MD_CTX_init(&ctx);
 119 #ifdef  DEBUG_KEYGEN
 120     fprintf(stderr, "KEYGEN DEBUG\n");
 121     fprintf(stderr, "ID %d, ITER %d\n", id, iter);
 122     fprintf(stderr, "Password (length %d):\n", passlen);
 123     h__dump(pass, passlen);
 124     fprintf(stderr, "Salt (length %d):\n", saltlen);
 125     h__dump(salt, saltlen);
 126 #endif
 127     v = EVP_MD_block_size(md_type);
 128     u = EVP_MD_size(md_type);
 129     if (u < 0)
 130         return 0;
 131     D = OPENSSL_malloc(v);
 132     Ai = OPENSSL_malloc(u);
 133     B = OPENSSL_malloc(v + 1);
 134     Slen = v * ((saltlen + v - 1) / v);
 135     if (passlen)
 136         Plen = v * ((passlen + v - 1) / v);
 137     else
 138         Plen = 0;
 139     Ilen = Slen + Plen;
 140     I = OPENSSL_malloc(Ilen);
 141     Ij = BN_new();
 142     Bpl1 = BN_new();
 143     if (D == NULL || Ai == NULL || B == NULL || I == NULL || Ij == NULL
 144             || Bpl1 == NULL)
 145         goto err;
 146     for (i = 0; i < v; i++)
 147         D[i] = id;
 148     p = I;
 149     for (i = 0; i < Slen; i++)
 150         *p++ = salt[i % saltlen];
 151     for (i = 0; i < Plen; i++)
 152         *p++ = pass[i % passlen];
 153     for (;;) {
 154         if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
 155             || !EVP_DigestUpdate(&ctx, D, v)
 156             || !EVP_DigestUpdate(&ctx, I, Ilen)
 157             || !EVP_DigestFinal_ex(&ctx, Ai, NULL))
 158             goto err;
 159         for (j = 1; j < iter; j++) {
 160             if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
 161                 || !EVP_DigestUpdate(&ctx, Ai, u)
 162                 || !EVP_DigestFinal_ex(&ctx, Ai, NULL))
 163                 goto err;
 164         }
 165         memcpy(out, Ai, min(n, u));
 166         if (u >= n) {
 167 #ifdef DEBUG_KEYGEN
 168             fprintf(stderr, "Output KEY (length %d)\n", tmpn);
 169             h__dump(tmpout, tmpn);
 170 #endif
 171             ret = 1;
 172             goto end;
 173         }
 174         n -= u;
 175         out += u;
 176         for (j = 0; j < v; j++)
 177             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
 222 #ifdef DEBUG_KEYGEN
 223 void h__dump(unsigned char *p, int len)
 224 {
 225     for (; len--; p++)
 226         fprintf(stderr, "%02X", *p);
 227     fprintf(stderr, "\n");
 228 }
 229 #endif