1/*
2 * Copyright 1999-2019 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/kdf.h>
16#include <openssl/hmac.h>
17#include <openssl/trace.h>
18#include <openssl/core_names.h>
19#include "crypto/evp.h"
20#include "evp_local.h"
21
22int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
23 const unsigned char *salt, int saltlen, int iter,
24 const EVP_MD *digest, int keylen, unsigned char *out)
25{
26 const char *empty = "";
27 int rv = 1, mode = 1;
28 EVP_KDF *kdf;
29 EVP_KDF_CTX *kctx;
30 const char *mdname = EVP_MD_name(digest);
31 OSSL_PARAM params[6], *p = params;
32
33 /* Keep documented behaviour. */
34 if (pass == NULL) {
35 pass = empty;
36 passlen = 0;
37 } else if (passlen == -1) {
38 passlen = strlen(pass);
39 }
40 if (salt == NULL && saltlen == 0)
41 salt = (unsigned char *)empty;
42
43 kdf = EVP_KDF_fetch(NULL, OSSL_KDF_NAME_PBKDF2, NULL);
44 kctx = EVP_KDF_CTX_new(kdf);
45 EVP_KDF_free(kdf);
46 if (kctx == NULL)
47 return 0;
48 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
49 (char *)pass, (size_t)passlen);
50 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode);
51 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
52 (unsigned char *)salt, saltlen);
53 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
54 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
55 (char *)mdname, strlen(mdname) + 1);
56 *p = OSSL_PARAM_construct_end();
57 if (EVP_KDF_CTX_set_params(kctx, params) != 1
58 || EVP_KDF_derive(kctx, out, keylen) != 1)
59 rv = 0;
60
61 EVP_KDF_CTX_free(kctx);
62
63 OSSL_TRACE_BEGIN(PKCS5V2) {
64 BIO_printf(trc_out, "Password:\n");
65 BIO_hex_string(trc_out,
66 0, passlen, pass, passlen);
67 BIO_printf(trc_out, "\n");
68 BIO_printf(trc_out, "Salt:\n");
69 BIO_hex_string(trc_out,
70 0, saltlen, salt, saltlen);
71 BIO_printf(trc_out, "\n");
72 BIO_printf(trc_out, "Iteration count %d\n", iter);
73 BIO_printf(trc_out, "Key:\n");
74 BIO_hex_string(trc_out,
75 0, keylen, out, keylen);
76 BIO_printf(trc_out, "\n");
77 } OSSL_TRACE_END(PKCS5V2);
78 return rv;
79}
80
81int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
82 const unsigned char *salt, int saltlen, int iter,
83 int keylen, unsigned char *out)
84{
85 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
86 keylen, out);
87}
88
89/*
90 * Now the key derivation function itself. This is a bit evil because it has
91 * to check the ASN1 parameters are valid: and there are quite a few of
92 * them...
93 */
94
95int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
96 ASN1_TYPE *param, const EVP_CIPHER *c,
97 const EVP_MD *md, int en_de)
98{
99 PBE2PARAM *pbe2 = NULL;
100 const EVP_CIPHER *cipher;
101 EVP_PBE_KEYGEN *kdf;
102
103 int rv = 0;
104
105 pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
106 if (pbe2 == NULL) {
107 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
108 goto err;
109 }
110
111 /* See if we recognise the key derivation function */
112 if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
113 NULL, NULL, &kdf)) {
114 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
115 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
116 goto err;
117 }
118
119 /*
120 * lets see if we recognise the encryption algorithm.
121 */
122
123 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
124
125 if (!cipher) {
126 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER);
127 goto err;
128 }
129
130 /* Fixup cipher based on AlgorithmIdentifier */
131 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
132 goto err;
133 if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
134 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR);
135 goto err;
136 }
137 rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
138 err:
139 PBE2PARAM_free(pbe2);
140 return rv;
141}
142
143int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
144 int passlen, ASN1_TYPE *param,
145 const EVP_CIPHER *c, const EVP_MD *md, int en_de)
146{
147 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
148 int saltlen, iter, t;
149 int rv = 0;
150 unsigned int keylen = 0;
151 int prf_nid, hmac_md_nid;
152 PBKDF2PARAM *kdf = NULL;
153 const EVP_MD *prfmd;
154
155 if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
156 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
157 goto err;
158 }
159 keylen = EVP_CIPHER_CTX_key_length(ctx);
160 OPENSSL_assert(keylen <= sizeof(key));
161
162 /* Decode parameter */
163
164 kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
165
166 if (kdf == NULL) {
167 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
168 goto err;
169 }
170
171 t = EVP_CIPHER_CTX_key_length(ctx);
172 if (t < 0) {
173 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH);
174 goto err;
175 }
176 keylen = t;
177
178 /* Now check the parameters of the kdf */
179
180 if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
181 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
182 goto err;
183 }
184
185 if (kdf->prf)
186 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
187 else
188 prf_nid = NID_hmacWithSHA1;
189
190 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
191 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
192 goto err;
193 }
194
195 prfmd = EVP_get_digestbynid(hmac_md_nid);
196 if (prfmd == NULL) {
197 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
198 goto err;
199 }
200
201 if (kdf->salt->type != V_ASN1_OCTET_STRING) {
202 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
203 goto err;
204 }
205
206 /* it seems that its all OK */
207 salt = kdf->salt->value.octet_string->data;
208 saltlen = kdf->salt->value.octet_string->length;
209 iter = ASN1_INTEGER_get(kdf->iter);
210 if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
211 keylen, key))
212 goto err;
213 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
214 err:
215 OPENSSL_cleanse(key, keylen);
216 PBKDF2PARAM_free(kdf);
217 return rv;
218}
219