| 1 | /*
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| 2 | * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <stdlib.h>
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| 12 | #include "internal/cryptlib.h"
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| 13 | #include <openssl/x509.h>
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| 14 | #include <openssl/evp.h>
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| 15 |
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| 16 | /*
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| 17 | * Doesn't do anything now: Builtin PBE algorithms in static table.
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| 18 | */
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| 19 |
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| 20 | void PKCS5_PBE_add(void)
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| 21 | {
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| 22 | }
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| 23 |
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| 24 | int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
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| 25 | ASN1_TYPE *param, const EVP_CIPHER *cipher,
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| 26 | const EVP_MD *md, int en_de)
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| 27 | {
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| 28 | EVP_MD_CTX *ctx;
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| 29 | unsigned char md_tmp[EVP_MAX_MD_SIZE];
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| 30 | unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
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| 31 | int i, ivl, kl;
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| 32 | PBEPARAM *pbe;
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| 33 | int saltlen, iter;
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| 34 | unsigned char *salt;
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| 35 | int mdsize;
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| 36 | int rv = 0;
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| 37 |
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| 38 | /* Extract useful info from parameter */
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| 39 | if (param == NULL || param->type != V_ASN1_SEQUENCE ||
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| 40 | param->value.sequence == NULL) {
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| 41 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
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| 42 | return 0;
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| 43 | }
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| 44 |
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| 45 | pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
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| 46 | if (pbe == NULL) {
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| 47 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
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| 48 | return 0;
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| 49 | }
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| 50 |
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| 51 | ivl = EVP_CIPHER_iv_length(cipher);
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| 52 | if (ivl < 0 || ivl > 16) {
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| 53 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_IV_LENGTH);
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| 54 | PBEPARAM_free(pbe);
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| 55 | return 0;
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| 56 | }
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| 57 | kl = EVP_CIPHER_key_length(cipher);
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| 58 | if (kl < 0 || kl > (int)sizeof(md_tmp)) {
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| 59 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH);
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| 60 | PBEPARAM_free(pbe);
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| 61 | return 0;
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| 62 | }
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| 63 |
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| 64 | if (!pbe->iter)
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| 65 | iter = 1;
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| 66 | else
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| 67 | iter = ASN1_INTEGER_get(pbe->iter);
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| 68 | salt = pbe->salt->data;
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| 69 | saltlen = pbe->salt->length;
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| 70 |
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| 71 | if (!pass)
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| 72 | passlen = 0;
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| 73 | else if (passlen == -1)
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| 74 | passlen = strlen(pass);
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| 75 |
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| 76 | ctx = EVP_MD_CTX_new();
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| 77 | if (ctx == NULL) {
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| 78 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE);
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| 79 | goto err;
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| 80 | }
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| 81 |
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| 82 | if (!EVP_DigestInit_ex(ctx, md, NULL))
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| 83 | goto err;
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| 84 | if (!EVP_DigestUpdate(ctx, pass, passlen))
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| 85 | goto err;
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| 86 | if (!EVP_DigestUpdate(ctx, salt, saltlen))
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| 87 | goto err;
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| 88 | PBEPARAM_free(pbe);
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| 89 | pbe = NULL;
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| 90 | if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
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| 91 | goto err;
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| 92 | mdsize = EVP_MD_size(md);
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| 93 | if (mdsize < 0)
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| 94 | return 0;
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| 95 | for (i = 1; i < iter; i++) {
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| 96 | if (!EVP_DigestInit_ex(ctx, md, NULL))
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| 97 | goto err;
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| 98 | if (!EVP_DigestUpdate(ctx, md_tmp, mdsize))
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| 99 | goto err;
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| 100 | if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
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| 101 | goto err;
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| 102 | }
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| 103 | memcpy(key, md_tmp, kl);
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| 104 | memcpy(iv, md_tmp + (16 - ivl), ivl);
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| 105 | if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
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| 106 | goto err;
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| 107 | OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
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| 108 | OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
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| 109 | OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
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| 110 | rv = 1;
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| 111 | err:
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| 112 | PBEPARAM_free(pbe);
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| 113 | EVP_MD_CTX_free(ctx);
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| 114 | return rv;
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| 115 | }
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