crypto/evp/p5_crpt.c

   1 /*
   2  * Copyright 1999-2021 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 #include <openssl/core_names.h>
  16 #include <openssl/kdf.h>
  17
  18 /*
  19  * Doesn't do anything now: Builtin PBE algorithms in static table.
  20  */
  21
  22 void PKCS5_PBE_add(void)
  23 {
  24 }
  25
  26 int PKCS5_PBE_keyivgen_ex(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
  27                           ASN1_TYPE *param, const EVP_CIPHER *cipher,
  28                           const EVP_MD *md, int en_de, OSSL_LIB_CTX *libctx,
  29                           const char *propq)
  30 {
  31     unsigned char md_tmp[EVP_MAX_MD_SIZE];
  32     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
  33     int ivl, kl;
  34     PBEPARAM *pbe = NULL;
  35     int saltlen, iter;
  36     unsigned char *salt;
  37     int mdsize;
  38     int rv = 0;
  39     EVP_KDF *kdf;
  40     EVP_KDF_CTX *kctx = NULL;
  41     OSSL_PARAM params[5], *p = params;
  42     const char *mdname = EVP_MD_name(md);
  43
  44     /* Extract useful info from parameter */
  45     if (param == NULL || param->type != V_ASN1_SEQUENCE ||
  46         param->value.sequence == NULL) {
  47         ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
  48         return 0;
  49     }
  50
  51     pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
  52     if (pbe == NULL) {
  53         ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
  54         return 0;
  55     }
  56
  57     ivl = EVP_CIPHER_get_iv_length(cipher);
  58     if (ivl < 0 || ivl > 16) {
  59         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_IV_LENGTH);
  60         goto err;
  61     }
  62     kl = EVP_CIPHER_get_key_length(cipher);
  63     if (kl < 0 || kl > (int)sizeof(md_tmp)) {
  64         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
  65         goto err;
  66     }
  67
  68     if (pbe->iter == NULL)
  69         iter = 1;
  70     else
  71         iter = ASN1_INTEGER_get(pbe->iter);
  72     salt = pbe->salt->data;
  73     saltlen = pbe->salt->length;
  74
  75     if (pass == NULL)
  76         passlen = 0;
  77     else if (passlen == -1)
  78         passlen = strlen(pass);
  79
  80     mdsize = EVP_MD_get_size(md);
  81     if (mdsize < 0)
  82         goto err;
  83
  84     kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF1, propq);
  85     kctx = EVP_KDF_CTX_new(kdf);
  86     EVP_KDF_free(kdf);
  87     if (kctx == NULL)
  88         goto err;
  89     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
  90                                              (char *)pass, (size_t)passlen);
  91     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
  92                                              salt, saltlen);
  93     *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
  94     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  95                                             (char *)mdname, 0);
  96     *p = OSSL_PARAM_construct_end();
  97     if (EVP_KDF_derive(kctx, md_tmp, mdsize, params) != 1)
  98         goto err;
  99     memcpy(key, md_tmp, kl);
 100     memcpy(iv, md_tmp + (16 - ivl), ivl);
 101     if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
 102         goto err;
 103     OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
 104     OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
 105     OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
 106     rv = 1;
 107  err:
 108     EVP_KDF_CTX_free(kctx);
 109     PBEPARAM_free(pbe);
 110     return rv;
 111 }
 112
 113 int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
 114                        ASN1_TYPE *param, const EVP_CIPHER *cipher,
 115                        const EVP_MD *md, int en_de)
 116 {
 117     return PKCS5_PBE_keyivgen_ex(cctx, pass, passlen, param, cipher, md, en_de,
 118                                  NULL, NULL);
 119 }
 120