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
22void PKCS5_PBE_add(void)
23{
24}
25
26int 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
113int 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
121