crypto/evp/p5_crpt.c

   1 /*
   2  * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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, ivl, kl;
  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     ivl = EVP_CIPHER_iv_length(cipher);
  52     if (ivl < 0 || ivl > 16) {
  53         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_IV_LENGTH);
  54         return 0;
  55     }
  56     kl = EVP_CIPHER_key_length(cipher);
  57     if (kl < 0 || kl > (int)sizeof(md_tmp)) {
  58         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH);
  59         return 0;
  60     }
  61
  62     if (pbe->iter == NULL)
  63         iter = 1;
  64     else
  65         iter = ASN1_INTEGER_get(pbe->iter);
  66     salt = pbe->salt->data;
  67     saltlen = pbe->salt->length;
  68
  69     if (pass == NULL)
  70         passlen = 0;
  71     else if (passlen == -1)
  72         passlen = strlen(pass);
  73
  74     ctx = EVP_MD_CTX_new();
  75     if (ctx == NULL) {
  76         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE);
  77         goto err;
  78     }
  79
  80     if (!EVP_DigestInit_ex(ctx, md, NULL))
  81         goto err;
  82     if (!EVP_DigestUpdate(ctx, pass, passlen))
  83         goto err;
  84     if (!EVP_DigestUpdate(ctx, salt, saltlen))
  85         goto err;
  86     PBEPARAM_free(pbe);
  87     if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
  88         goto err;
  89     mdsize = EVP_MD_size(md);
  90     if (mdsize < 0)
  91         return 0;
  92     for (i = 1; i < iter; i++) {
  93         if (!EVP_DigestInit_ex(ctx, md, NULL))
  94             goto err;
  95         if (!EVP_DigestUpdate(ctx, md_tmp, mdsize))
  96             goto err;
  97         if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
  98             goto err;
  99     }
 100     memcpy(key, md_tmp, kl);
 101     memcpy(iv, md_tmp + (16 - ivl), ivl);
 102     if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
 103         goto err;
 104     OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
 105     OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
 106     OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
 107     rv = 1;
 108  err:
 109     EVP_MD_CTX_free(ctx);
 110     return rv;
 111 }