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 "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/core.h>
14 #include <openssl/core_names.h>
15 #include <openssl/x509.h>
16 #include <openssl/rand.h>
17
18 /* PKCS#5 v2.0 password based encryption structures */
19
20 ASN1_SEQUENCE(PBE2PARAM) = {
21 ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
22 ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
23 } ASN1_SEQUENCE_END(PBE2PARAM)
24
25 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
26
27 ASN1_SEQUENCE(PBKDF2PARAM) = {
28 ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
29 ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
30 ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
31 ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
32 } ASN1_SEQUENCE_END(PBKDF2PARAM)
33
34 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
35
36 /*
37 * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
38 * this is horrible! Extended version to allow application supplied PRF NID
39 * and IV.
40 */
41
42 X509_ALGOR *PKCS5_pbe2_set_iv_ex(const EVP_CIPHER *cipher, int iter,
43 unsigned char *salt, int saltlen,
44 unsigned char *aiv, int prf_nid,
45 OSSL_LIB_CTX *libctx)
46 {
47 X509_ALGOR *scheme = NULL, *ret = NULL;
48 int alg_nid, keylen, ivlen;
49 EVP_CIPHER_CTX *ctx = NULL;
50 unsigned char iv[EVP_MAX_IV_LENGTH];
51 PBE2PARAM *pbe2 = NULL;
52
53 alg_nid = EVP_CIPHER_get_type(cipher);
54 if (alg_nid == NID_undef) {
55 ERR_raise(ERR_LIB_ASN1, ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
56 goto err;
57 }
58
59 if ((pbe2 = PBE2PARAM_new()) == NULL)
60 goto merr;
61
62 /* Setup the AlgorithmIdentifier for the encryption scheme */
63 scheme = pbe2->encryption;
64 scheme->algorithm = OBJ_nid2obj(alg_nid);
65 if ((scheme->parameter = ASN1_TYPE_new()) == NULL)
66 goto merr;
67
68 /* Create random IV */
69 ivlen = EVP_CIPHER_get_iv_length(cipher);
70 if (ivlen > 0) {
71 if (aiv)
72 memcpy(iv, aiv, ivlen);
73 else if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
74 goto err;
75 }
76
77 ctx = EVP_CIPHER_CTX_new();
78 if (ctx == NULL)
79 goto merr;
80
81 /* Dummy cipherinit to just setup the IV, and PRF */
82 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0))
83 goto err;
84 if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) <= 0) {
85 ERR_raise(ERR_LIB_ASN1, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
86 goto err;
87 }
88 /*
89 * If prf NID unspecified see if cipher has a preference. An error is OK
90 * here: just means use default PRF.
91 */
92 ERR_set_mark();
93 if ((prf_nid == -1) &&
94 EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
95 prf_nid = NID_hmacWithSHA256;
96 }
97 ERR_pop_to_mark();
98 EVP_CIPHER_CTX_free(ctx);
99 ctx = NULL;
100
101 /* If its RC2 then we'd better setup the key length */
102
103 if (alg_nid == NID_rc2_cbc)
104 keylen = EVP_CIPHER_get_key_length(cipher);
105 else
106 keylen = -1;
107
108 /* Setup keyfunc */
109
110 X509_ALGOR_free(pbe2->keyfunc);
111
112 pbe2->keyfunc = PKCS5_pbkdf2_set_ex(iter, salt, saltlen, prf_nid, keylen,
113 libctx);
114
115 if (pbe2->keyfunc == NULL)
116 goto merr;
117
118 /* Now set up top level AlgorithmIdentifier */
119
120 if ((ret = X509_ALGOR_new()) == NULL)
121 goto merr;
122
123 ret->algorithm = OBJ_nid2obj(NID_pbes2);
124
125 /* Encode PBE2PARAM into parameter */
126
127 if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
128 &ret->parameter))
129 goto merr;
130
131 PBE2PARAM_free(pbe2);
132 pbe2 = NULL;
133
134 return ret;
135
136 merr:
137 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
138
139 err:
140 EVP_CIPHER_CTX_free(ctx);
141 PBE2PARAM_free(pbe2);
142 /* Note 'scheme' is freed as part of pbe2 */
143 X509_ALGOR_free(ret);
144
145 return NULL;
146 }
147
PKCS5_pbe2_set_iv(const EVP_CIPHER * cipher,int iter,unsigned char * salt,int saltlen,unsigned char * aiv,int prf_nid)148 X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
149 unsigned char *salt, int saltlen,
150 unsigned char *aiv, int prf_nid)
151 {
152 return PKCS5_pbe2_set_iv_ex(cipher, iter, salt, saltlen, aiv, prf_nid,
153 NULL);
154 }
155
PKCS5_pbe2_set(const EVP_CIPHER * cipher,int iter,unsigned char * salt,int saltlen)156 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
157 unsigned char *salt, int saltlen)
158 {
159 return PKCS5_pbe2_set_iv_ex(cipher, iter, salt, saltlen, NULL, -1,
160 NULL);
161 }
162
163
PKCS5_pbkdf2_set_ex(int iter,unsigned char * salt,int saltlen,int prf_nid,int keylen,OSSL_LIB_CTX * libctx)164 X509_ALGOR *PKCS5_pbkdf2_set_ex(int iter, unsigned char *salt, int saltlen,
165 int prf_nid, int keylen,
166 OSSL_LIB_CTX *libctx)
167 {
168 X509_ALGOR *keyfunc = NULL;
169 PBKDF2PARAM *kdf = NULL;
170 ASN1_OCTET_STRING *osalt = NULL;
171
172 if ((kdf = PBKDF2PARAM_new()) == NULL)
173 goto merr;
174 if ((osalt = ASN1_OCTET_STRING_new()) == NULL)
175 goto merr;
176
177 kdf->salt->value.octet_string = osalt;
178 kdf->salt->type = V_ASN1_OCTET_STRING;
179
180 if (saltlen < 0)
181 goto merr;
182 if (saltlen == 0)
183 saltlen = PKCS5_SALT_LEN;
184 if ((osalt->data = OPENSSL_malloc(saltlen)) == NULL)
185 goto merr;
186
187 osalt->length = saltlen;
188
189 if (salt)
190 memcpy(osalt->data, salt, saltlen);
191 else if (RAND_bytes_ex(libctx, osalt->data, saltlen, 0) <= 0)
192 goto merr;
193
194 if (iter <= 0)
195 iter = PKCS5_DEFAULT_ITER;
196
197 if (!ASN1_INTEGER_set(kdf->iter, iter))
198 goto merr;
199
200 /* If have a key len set it up */
201
202 if (keylen > 0) {
203 if ((kdf->keylength = ASN1_INTEGER_new()) == NULL)
204 goto merr;
205 if (!ASN1_INTEGER_set(kdf->keylength, keylen))
206 goto merr;
207 }
208
209 /* prf can stay NULL if we are using hmacWithSHA1 */
210 if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
211 kdf->prf = X509_ALGOR_new();
212 if (kdf->prf == NULL)
213 goto merr;
214 X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
215 }
216
217 /* Finally setup the keyfunc structure */
218
219 keyfunc = X509_ALGOR_new();
220 if (keyfunc == NULL)
221 goto merr;
222
223 keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
224
225 /* Encode PBKDF2PARAM into parameter of pbe2 */
226
227 if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), kdf,
228 &keyfunc->parameter))
229 goto merr;
230
231 PBKDF2PARAM_free(kdf);
232 return keyfunc;
233
234 merr:
235 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
236 PBKDF2PARAM_free(kdf);
237 X509_ALGOR_free(keyfunc);
238 return NULL;
239 }
240
PKCS5_pbkdf2_set(int iter,unsigned char * salt,int saltlen,int prf_nid,int keylen)241 X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
242 int prf_nid, int keylen)
243 {
244 return PKCS5_pbkdf2_set_ex(iter, salt, saltlen, prf_nid, keylen, NULL);
245 }
246
247