crypto/pkcs12/p12_decr.c

   1 /* p12_decr.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
  64 /* Define this to dump decrypted output to files called DERnnn */
  65 /*
  66  * #define DEBUG_DECRYPT
  67  */
  68
  69 /*
  70  * Encrypt/Decrypt a buffer based on password and algor, result in a
  71  * OPENSSL_malloc'ed buffer
  72  */
  73
  74 unsigned char *PKCS12_pbe_crypt(X509_ALGOR *algor, const char *pass,
  75                                 int passlen, unsigned char *in, int inlen,
  76                                 unsigned char **data, int *datalen, int en_de)
  77 {
  78     unsigned char *out;
  79     int outlen, i;
  80     EVP_CIPHER_CTX ctx;
  81
  82     EVP_CIPHER_CTX_init(&ctx);
  83     /* Decrypt data */
  84     if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,
  85                             algor->parameter, &ctx, en_de)) {
  86         PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
  87                   PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);
  88         return NULL;
  89     }
  90
  91     if ((out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))
  92             == NULL) {
  93         PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);
  94         goto err;
  95     }
  96
  97     if (!EVP_CipherUpdate(&ctx, out, &i, in, inlen)) {
  98         OPENSSL_free(out);
  99         out = NULL;
 100         PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_EVP_LIB);
 101         goto err;
 102     }
 103
 104     outlen = i;
 105     if (!EVP_CipherFinal_ex(&ctx, out + i, &i)) {
 106         OPENSSL_free(out);
 107         out = NULL;
 108         PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
 109                   PKCS12_R_PKCS12_CIPHERFINAL_ERROR);
 110         goto err;
 111     }
 112     outlen += i;
 113     if (datalen)
 114         *datalen = outlen;
 115     if (data)
 116         *data = out;
 117  err:
 118     EVP_CIPHER_CTX_cleanup(&ctx);
 119     return out;
 120
 121 }
 122
 123 /*
 124  * Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer
 125  * after use.
 126  */
 127
 128 void *PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,
 129                               const char *pass, int passlen,
 130                               ASN1_OCTET_STRING *oct, int zbuf)
 131 {
 132     unsigned char *out;
 133     const unsigned char *p;
 134     void *ret;
 135     int outlen;
 136
 137     if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,
 138                           &out, &outlen, 0)) {
 139         PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,
 140                   PKCS12_R_PKCS12_PBE_CRYPT_ERROR);
 141         return NULL;
 142     }
 143     p = out;
 144 #ifdef DEBUG_DECRYPT
 145     {
 146         FILE *op;
 147
 148         char fname[30];
 149         static int fnm = 1;
 150         sprintf(fname, "DER%d", fnm++);
 151         op = fopen(fname, "wb");
 152         fwrite(p, 1, outlen, op);
 153         fclose(op);
 154     }
 155 #endif
 156     ret = ASN1_item_d2i(NULL, &p, outlen, it);
 157     if (zbuf)
 158         OPENSSL_cleanse(out, outlen);
 159     if (!ret)
 160         PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I, PKCS12_R_DECODE_ERROR);
 161     OPENSSL_free(out);
 162     return ret;
 163 }
 164
 165 /*
 166  * Encode ASN1 structure and encrypt, return OCTET STRING if zbuf set zero
 167  * encoding.
 168  */
 169
 170 ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,
 171                                            const ASN1_ITEM *it,
 172                                            const char *pass, int passlen,
 173                                            void *obj, int zbuf)
 174 {
 175     ASN1_OCTET_STRING *oct = NULL;
 176     unsigned char *in = NULL;
 177     int inlen;
 178
 179     if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
 180         PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, ERR_R_MALLOC_FAILURE);
 181         goto err;
 182     }
 183     inlen = ASN1_item_i2d(obj, &in, it);
 184     if (!in) {
 185         PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCODE_ERROR);
 186         goto err;
 187     }
 188     if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,
 189                           &oct->length, 1)) {
 190         PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCRYPT_ERROR);
 191         OPENSSL_free(in);
 192         goto err;
 193     }
 194     if (zbuf)
 195         OPENSSL_cleanse(in, inlen);
 196     OPENSSL_free(in);
 197     return oct;
 198  err:
 199     ASN1_OCTET_STRING_free(oct);
 200     return NULL;
 201 }