xref: /openssl/crypto/evp/p5_crpt.c (revision 7ed6de99)
1 /*
2  * Copyright 1999-2024 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 
PKCS5_PBE_add(void)22 void PKCS5_PBE_add(void)
23 {
24 }
25 
PKCS5_PBE_keyivgen_ex(EVP_CIPHER_CTX * cctx,const char * pass,int passlen,ASN1_TYPE * param,const EVP_CIPHER * cipher,const EVP_MD * md,int en_de,OSSL_LIB_CTX * libctx,const char * propq)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 
PKCS5_PBE_keyivgen(EVP_CIPHER_CTX * cctx,const char * pass,int passlen,ASN1_TYPE * param,const EVP_CIPHER * cipher,const EVP_MD * md,int en_de)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 
121