1 /*
2 * Copyright 2015-2021 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_names.h>
14 #include <openssl/err.h>
15 #include <openssl/evp.h>
16 #include <openssl/x509.h>
17 #include <openssl/rand.h>
18 #include "crypto/evp.h"
19
20 #ifndef OPENSSL_NO_SCRYPT
21 /* PKCS#5 scrypt password based encryption structures */
22
23 ASN1_SEQUENCE(SCRYPT_PARAMS) = {
24 ASN1_SIMPLE(SCRYPT_PARAMS, salt, ASN1_OCTET_STRING),
25 ASN1_SIMPLE(SCRYPT_PARAMS, costParameter, ASN1_INTEGER),
26 ASN1_SIMPLE(SCRYPT_PARAMS, blockSize, ASN1_INTEGER),
27 ASN1_SIMPLE(SCRYPT_PARAMS, parallelizationParameter, ASN1_INTEGER),
28 ASN1_OPT(SCRYPT_PARAMS, keyLength, ASN1_INTEGER),
29 } ASN1_SEQUENCE_END(SCRYPT_PARAMS)
30
31 IMPLEMENT_ASN1_FUNCTIONS(SCRYPT_PARAMS)
32
33 static X509_ALGOR *pkcs5_scrypt_set(const unsigned char *salt, size_t saltlen,
34 size_t keylen, uint64_t N, uint64_t r,
35 uint64_t p);
36
37 /*
38 * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm using scrypt
39 */
40
PKCS5_pbe2_set_scrypt(const EVP_CIPHER * cipher,const unsigned char * salt,int saltlen,unsigned char * aiv,uint64_t N,uint64_t r,uint64_t p)41 X509_ALGOR *PKCS5_pbe2_set_scrypt(const EVP_CIPHER *cipher,
42 const unsigned char *salt, int saltlen,
43 unsigned char *aiv, uint64_t N, uint64_t r,
44 uint64_t p)
45 {
46 X509_ALGOR *scheme = NULL, *ret = NULL;
47 int alg_nid;
48 size_t keylen = 0;
49 EVP_CIPHER_CTX *ctx = NULL;
50 unsigned char iv[EVP_MAX_IV_LENGTH];
51 PBE2PARAM *pbe2 = NULL;
52
53 if (!cipher) {
54 ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
55 goto err;
56 }
57
58 if (EVP_PBE_scrypt(NULL, 0, NULL, 0, N, r, p, 0, NULL, 0) == 0) {
59 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_SCRYPT_PARAMETERS);
60 goto err;
61 }
62
63 alg_nid = EVP_CIPHER_get_type(cipher);
64 if (alg_nid == NID_undef) {
65 ERR_raise(ERR_LIB_ASN1, ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
66 goto err;
67 }
68
69 pbe2 = PBE2PARAM_new();
70 if (pbe2 == NULL)
71 goto merr;
72
73 /* Setup the AlgorithmIdentifier for the encryption scheme */
74 scheme = pbe2->encryption;
75
76 scheme->algorithm = OBJ_nid2obj(alg_nid);
77 scheme->parameter = ASN1_TYPE_new();
78 if (scheme->parameter == NULL)
79 goto merr;
80
81 /* Create random IV */
82 if (EVP_CIPHER_get_iv_length(cipher)) {
83 if (aiv)
84 memcpy(iv, aiv, EVP_CIPHER_get_iv_length(cipher));
85 else if (RAND_bytes(iv, EVP_CIPHER_get_iv_length(cipher)) <= 0)
86 goto err;
87 }
88
89 ctx = EVP_CIPHER_CTX_new();
90 if (ctx == NULL)
91 goto merr;
92
93 /* Dummy cipherinit to just setup the IV */
94 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0) == 0)
95 goto err;
96 if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) <= 0) {
97 ERR_raise(ERR_LIB_ASN1, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
98 goto err;
99 }
100 EVP_CIPHER_CTX_free(ctx);
101 ctx = NULL;
102
103 /* If its RC2 then we'd better setup the key length */
104
105 if (alg_nid == NID_rc2_cbc)
106 keylen = EVP_CIPHER_get_key_length(cipher);
107
108 /* Setup keyfunc */
109
110 X509_ALGOR_free(pbe2->keyfunc);
111
112 pbe2->keyfunc = pkcs5_scrypt_set(salt, saltlen, keylen, N, r, p);
113
114 if (pbe2->keyfunc == NULL)
115 goto merr;
116
117 /* Now set up top level AlgorithmIdentifier */
118
119 ret = X509_ALGOR_new();
120 if (ret == 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) == NULL)
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 PBE2PARAM_free(pbe2);
141 X509_ALGOR_free(ret);
142 EVP_CIPHER_CTX_free(ctx);
143
144 return NULL;
145 }
146
pkcs5_scrypt_set(const unsigned char * salt,size_t saltlen,size_t keylen,uint64_t N,uint64_t r,uint64_t p)147 static X509_ALGOR *pkcs5_scrypt_set(const unsigned char *salt, size_t saltlen,
148 size_t keylen, uint64_t N, uint64_t r,
149 uint64_t p)
150 {
151 X509_ALGOR *keyfunc = NULL;
152 SCRYPT_PARAMS *sparam = SCRYPT_PARAMS_new();
153
154 if (sparam == NULL)
155 goto merr;
156
157 if (!saltlen)
158 saltlen = PKCS5_SALT_LEN;
159
160 /* This will either copy salt or grow the buffer */
161 if (ASN1_STRING_set(sparam->salt, salt, saltlen) == 0)
162 goto merr;
163
164 if (salt == NULL && RAND_bytes(sparam->salt->data, saltlen) <= 0)
165 goto err;
166
167 if (ASN1_INTEGER_set_uint64(sparam->costParameter, N) == 0)
168 goto merr;
169
170 if (ASN1_INTEGER_set_uint64(sparam->blockSize, r) == 0)
171 goto merr;
172
173 if (ASN1_INTEGER_set_uint64(sparam->parallelizationParameter, p) == 0)
174 goto merr;
175
176 /* If have a key len set it up */
177
178 if (keylen > 0) {
179 sparam->keyLength = ASN1_INTEGER_new();
180 if (sparam->keyLength == NULL)
181 goto merr;
182 if (ASN1_INTEGER_set_int64(sparam->keyLength, keylen) == 0)
183 goto merr;
184 }
185
186 /* Finally setup the keyfunc structure */
187
188 keyfunc = X509_ALGOR_new();
189 if (keyfunc == NULL)
190 goto merr;
191
192 keyfunc->algorithm = OBJ_nid2obj(NID_id_scrypt);
193
194 /* Encode SCRYPT_PARAMS into parameter of pbe2 */
195
196 if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(SCRYPT_PARAMS), sparam,
197 &keyfunc->parameter) == NULL)
198 goto merr;
199
200 SCRYPT_PARAMS_free(sparam);
201 return keyfunc;
202
203 merr:
204 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
205 err:
206 SCRYPT_PARAMS_free(sparam);
207 X509_ALGOR_free(keyfunc);
208 return NULL;
209 }
210
PKCS5_v2_scrypt_keyivgen_ex(EVP_CIPHER_CTX * ctx,const char * pass,int passlen,ASN1_TYPE * param,const EVP_CIPHER * c,const EVP_MD * md,int en_de,OSSL_LIB_CTX * libctx,const char * propq)211 int PKCS5_v2_scrypt_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass,
212 int passlen, ASN1_TYPE *param,
213 const EVP_CIPHER *c, const EVP_MD *md, int en_de,
214 OSSL_LIB_CTX *libctx, const char *propq)
215 {
216 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
217 uint64_t p, r, N;
218 size_t saltlen;
219 size_t keylen = 0;
220 int t, rv = 0;
221 SCRYPT_PARAMS *sparam = NULL;
222
223 if (EVP_CIPHER_CTX_get0_cipher(ctx) == NULL) {
224 ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
225 goto err;
226 }
227
228 /* Decode parameter */
229
230 sparam = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(SCRYPT_PARAMS), param);
231
232 if (sparam == NULL) {
233 ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
234 goto err;
235 }
236
237 t = EVP_CIPHER_CTX_get_key_length(ctx);
238 if (t < 0) {
239 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
240 goto err;
241 }
242 keylen = t;
243
244 /* Now check the parameters of sparam */
245
246 if (sparam->keyLength) {
247 uint64_t spkeylen;
248 if ((ASN1_INTEGER_get_uint64(&spkeylen, sparam->keyLength) == 0)
249 || (spkeylen != keylen)) {
250 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH);
251 goto err;
252 }
253 }
254 /* Check all parameters fit in uint64_t and are acceptable to scrypt */
255 if (ASN1_INTEGER_get_uint64(&N, sparam->costParameter) == 0
256 || ASN1_INTEGER_get_uint64(&r, sparam->blockSize) == 0
257 || ASN1_INTEGER_get_uint64(&p, sparam->parallelizationParameter) == 0
258 || EVP_PBE_scrypt_ex(NULL, 0, NULL, 0, N, r, p, 0, NULL, 0,
259 libctx, propq) == 0) {
260 ERR_raise(ERR_LIB_EVP, EVP_R_ILLEGAL_SCRYPT_PARAMETERS);
261 goto err;
262 }
263
264 /* it seems that its all OK */
265
266 salt = sparam->salt->data;
267 saltlen = sparam->salt->length;
268 if (EVP_PBE_scrypt_ex(pass, passlen, salt, saltlen, N, r, p, 0, key,
269 keylen, libctx, propq) == 0)
270 goto err;
271 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
272 err:
273 if (keylen)
274 OPENSSL_cleanse(key, keylen);
275 SCRYPT_PARAMS_free(sparam);
276 return rv;
277 }
278
PKCS5_v2_scrypt_keyivgen(EVP_CIPHER_CTX * ctx,const char * pass,int passlen,ASN1_TYPE * param,const EVP_CIPHER * c,const EVP_MD * md,int en_de)279 int PKCS5_v2_scrypt_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
280 int passlen, ASN1_TYPE *param,
281 const EVP_CIPHER *c, const EVP_MD *md, int en_de)
282 {
283 return PKCS5_v2_scrypt_keyivgen_ex(ctx, pass, passlen, param, c, md, en_de, NULL, NULL);
284 }
285
286 #endif /* OPENSSL_NO_SCRYPT */
287