crypto/evp/p5_crpt.c

   1 /*
   2  * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include "internal/cryptlib.h"
  13 #include <openssl/x509.h>
  14 #include <openssl/evp.h>
  15
  16 /*
  17  * Doesn't do anything now: Builtin PBE algorithms in static table.
  18  */
  19
  20 void PKCS5_PBE_add(void)
  21 {
  22 }
  23
  24 int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
  25                        ASN1_TYPE *param, const EVP_CIPHER *cipher,
  26                        const EVP_MD *md, int en_de)
  27 {
  28     EVP_MD_CTX *ctx;
  29     unsigned char md_tmp[EVP_MAX_MD_SIZE];
  30     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
  31     int i;
  32     PBEPARAM *pbe;
  33     int saltlen, iter;
  34     unsigned char *salt;
  35     int mdsize;
  36     int rv = 0;
  37
  38     /* Extract useful info from parameter */
  39     if (param == NULL || param->type != V_ASN1_SEQUENCE ||
  40         param->value.sequence == NULL) {
  41         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
  42         return 0;
  43     }
  44
  45     pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
  46     if (pbe == NULL) {
  47         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
  48         return 0;
  49     }
  50
  51     if (!pbe->iter)
  52         iter = 1;
  53     else
  54         iter = ASN1_INTEGER_get(pbe->iter);
  55     salt = pbe->salt->data;
  56     saltlen = pbe->salt->length;
  57
  58     if (!pass)
  59         passlen = 0;
  60     else if (passlen == -1)
  61         passlen = strlen(pass);
  62
  63     ctx = EVP_MD_CTX_new();
  64     if (ctx == NULL) {
  65         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE);
  66         goto err;
  67     }
  68
  69     if (!EVP_DigestInit_ex(ctx, md, NULL))
  70         goto err;
  71     if (!EVP_DigestUpdate(ctx, pass, passlen))
  72         goto err;
  73     if (!EVP_DigestUpdate(ctx, salt, saltlen))
  74         goto err;
  75     PBEPARAM_free(pbe);
  76     if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
  77         goto err;
  78     mdsize = EVP_MD_size(md);
  79     if (mdsize < 0)
  80         return 0;
  81     for (i = 1; i < iter; i++) {
  82         if (!EVP_DigestInit_ex(ctx, md, NULL))
  83             goto err;
  84         if (!EVP_DigestUpdate(ctx, md_tmp, mdsize))
  85             goto err;
  86         if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
  87             goto err;
  88     }
  89     OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));
  90     memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
  91     OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);
  92     memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
  93            EVP_CIPHER_iv_length(cipher));
  94     if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
  95         goto err;
  96     OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
  97     OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
  98     OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
  99     rv = 1;
 100  err:
 101     EVP_MD_CTX_free(ctx);
 102     return rv;
 103 }