| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1999-2020 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, 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 | PBEPARAM_free(pbe); |
| 55 | return 0; |
| 56 | } |
| 57 | kl = EVP_CIPHER_key_length(cipher); |
| 58 | if (kl < 0 || kl > (int)sizeof(md_tmp)) { |
| 59 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH); |
| 60 | PBEPARAM_free(pbe); |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | if (!pbe->iter) |
| 65 | iter = 1; |
| 66 | else |
| 67 | iter = ASN1_INTEGER_get(pbe->iter); |
| 68 | salt = pbe->salt->data; |
| 69 | saltlen = pbe->salt->length; |
| 70 | |
| 71 | if (!pass) |
| 72 | passlen = 0; |
| 73 | else if (passlen == -1) |
| 74 | passlen = strlen(pass); |
| 75 | |
| 76 | ctx = EVP_MD_CTX_new(); |
| 77 | if (ctx == NULL) { |
| 78 | EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE); |
| 79 | goto err; |
| 80 | } |
| 81 | |
| 82 | if (!EVP_DigestInit_ex(ctx, md, NULL)) |
| 83 | goto err; |
| 84 | if (!EVP_DigestUpdate(ctx, pass, passlen)) |
| 85 | goto err; |
| 86 | if (!EVP_DigestUpdate(ctx, salt, saltlen)) |
| 87 | goto err; |
| 88 | PBEPARAM_free(pbe); |
| 89 | pbe = NULL; |
| 90 | if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL)) |
| 91 | goto err; |
| 92 | mdsize = EVP_MD_size(md); |
| 93 | if (mdsize < 0) |
| 94 | return 0; |
| 95 | for (i = 1; i < iter; i++) { |
| 96 | if (!EVP_DigestInit_ex(ctx, md, NULL)) |
| 97 | goto err; |
| 98 | if (!EVP_DigestUpdate(ctx, md_tmp, mdsize)) |
| 99 | goto err; |
| 100 | if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL)) |
| 101 | goto err; |
| 102 | } |
| 103 | memcpy(key, md_tmp, kl); |
| 104 | memcpy(iv, md_tmp + (16 - ivl), ivl); |
| 105 | if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de)) |
| 106 | goto err; |
| 107 | OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE); |
| 108 | OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH); |
| 109 | OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH); |
| 110 | rv = 1; |
| 111 | err: |
| 112 | PBEPARAM_free(pbe); |
| 113 | EVP_MD_CTX_free(ctx); |
| 114 | return rv; |
| 115 | } |