GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/evp/p5_crpt2.c Lines: 76 123 61.8 %
Date: 2017-11-13 Branches: 39 72 54.2 %

Line Branch Exec Source
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/* $OpenBSD: p5_crpt2.c,v 1.23 2017/01/29 17:49:23 beck Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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 * project 1999.
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 */
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/* ====================================================================
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 * Copyright (c) 1999-2006 The OpenSSL Project.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 * 3. All advertising materials mentioning features or use of this
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 *    software must display the following acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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 *
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 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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 *    endorse or promote products derived from this software without
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 *    prior written permission. For written permission, please contact
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 *    licensing@OpenSSL.org.
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 *
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 * 5. Products derived from this software may not be called "OpenSSL"
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 *    nor may "OpenSSL" appear in their names without prior written
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 *    permission of the OpenSSL Project.
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 *
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 * 6. Redistributions of any form whatsoever must retain the following
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 *    acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ====================================================================
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 *
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 * This product includes cryptographic software written by Eric Young
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 * (eay@cryptsoft.com).  This product includes software written by Tim
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 * Hudson (tjh@cryptsoft.com).
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 *
57
 */
58
59
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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63
#include <openssl/opensslconf.h>
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65
#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
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67
#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/x509.h>
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72
#include "evp_locl.h"
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74
/* This is an implementation of PKCS#5 v2.0 password based encryption key
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 * derivation function PBKDF2.
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 * SHA1 version verified against test vectors posted by Peter Gutmann
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 * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
78
 */
79
80
int
81
PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
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    int saltlen, int iter, const EVP_MD *digest, int keylen, unsigned char *out)
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{
84
182
	unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
85
	int cplen, j, k, tkeylen, mdlen;
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	unsigned long i = 1;
87
91
	HMAC_CTX hctx_tpl, hctx;
88
89
91
	mdlen = EVP_MD_size(digest);
90
91
	if (mdlen < 0)
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		return 0;
92
93
91
	HMAC_CTX_init(&hctx_tpl);
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	p = out;
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	tkeylen = keylen;
96
91
	if (!pass)
97
		passlen = 0;
98
91
	else if (passlen == -1)
99
		passlen = strlen(pass);
100
91
	if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL)) {
101
		HMAC_CTX_cleanup(&hctx_tpl);
102
		return 0;
103
	}
104
468
	while (tkeylen) {
105
143
		if (tkeylen > mdlen)
106
52
			cplen = mdlen;
107
		else
108
			cplen = tkeylen;
109
		/* We are unlikely to ever use more than 256 blocks (5120 bits!)
110
		 * but just in case...
111
		 */
112
143
		itmp[0] = (unsigned char)((i >> 24) & 0xff);
113
143
		itmp[1] = (unsigned char)((i >> 16) & 0xff);
114
143
		itmp[2] = (unsigned char)((i >> 8) & 0xff);
115
143
		itmp[3] = (unsigned char)(i & 0xff);
116
143
		if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
117
			HMAC_CTX_cleanup(&hctx_tpl);
118
			return 0;
119
		}
120

286
		if (!HMAC_Update(&hctx, salt, saltlen) ||
121
143
		    !HMAC_Update(&hctx, itmp, 4) ||
122
143
		    !HMAC_Final(&hctx, digtmp, NULL)) {
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			HMAC_CTX_cleanup(&hctx_tpl);
124
			HMAC_CTX_cleanup(&hctx);
125
			return 0;
126
		}
127
143
		HMAC_CTX_cleanup(&hctx);
128
143
		memcpy(p, digtmp, cplen);
129
647222
		for (j = 1; j < iter; j++) {
130
323468
			if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
131
				HMAC_CTX_cleanup(&hctx_tpl);
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				return 0;
133
			}
134

646936
			if (!HMAC_Update(&hctx, digtmp, mdlen) ||
135
323468
			    !HMAC_Final(&hctx, digtmp, NULL)) {
136
				HMAC_CTX_cleanup(&hctx_tpl);
137
				HMAC_CTX_cleanup(&hctx);
138
				return 0;
139
			}
140
323468
			HMAC_CTX_cleanup(&hctx);
141
13807506
			for (k = 0; k < cplen; k++)
142
6580285
				p[k] ^= digtmp[k];
143
		}
144
143
		tkeylen -= cplen;
145
143
		i++;
146
143
		p += cplen;
147
	}
148
91
	HMAC_CTX_cleanup(&hctx_tpl);
149
91
	return 1;
150
91
}
151
152
int
153
PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, const unsigned char *salt,
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    int saltlen, int iter, int keylen, unsigned char *out)
155
{
156
	return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter,
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	    EVP_sha1(), keylen, out);
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}
159
160
/* Now the key derivation function itself. This is a bit evil because
161
 * it has to check the ASN1 parameters are valid: and there are quite a
162
 * few of them...
163
 */
164
165
int
166
PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
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    ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de)
168
{
169
92
	const unsigned char *pbuf;
170
	int plen;
171
	PBE2PARAM *pbe2 = NULL;
172
	const EVP_CIPHER *cipher;
173
174
	int rv = 0;
175
176

138
	if (param == NULL || param->type != V_ASN1_SEQUENCE ||
177
46
	    param->value.sequence == NULL) {
178
		EVPerror(EVP_R_DECODE_ERROR);
179
		goto err;
180
	}
181
182
46
	pbuf = param->value.sequence->data;
183
46
	plen = param->value.sequence->length;
184
46
	if (!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
185
		EVPerror(EVP_R_DECODE_ERROR);
186
		goto err;
187
	}
188
189
	/* See if we recognise the key derivation function */
190
191
46
	if (OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
192
		EVPerror(EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
193
		goto err;
194
	}
195
196
	/* lets see if we recognise the encryption algorithm.
197
	 */
198
199
46
	cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
200
201
46
	if (!cipher) {
202
		EVPerror(EVP_R_UNSUPPORTED_CIPHER);
203
		goto err;
204
	}
205
206
	/* Fixup cipher based on AlgorithmIdentifier */
207
46
	if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
208
		goto err;
209
46
	if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
210
		EVPerror(EVP_R_CIPHER_PARAMETER_ERROR);
211
		goto err;
212
	}
213
46
	rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
214
46
	    pbe2->keyfunc->parameter, c, md, en_de);
215
216
err:
217
46
	PBE2PARAM_free(pbe2);
218
46
	return rv;
219
46
}
220
221
int
222
PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
223
    ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de)
224
{
225
92
	unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
226
46
	const unsigned char *pbuf;
227
	int saltlen, iter, plen;
228
	int rv = 0;
229
	unsigned int keylen = 0;
230
46
	int prf_nid, hmac_md_nid;
231
	PBKDF2PARAM *kdf = NULL;
232
	const EVP_MD *prfmd;
233
234
46
	if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
235
		EVPerror(EVP_R_NO_CIPHER_SET);
236
		return 0;
237
	}
238
46
	keylen = EVP_CIPHER_CTX_key_length(ctx);
239
46
	if (keylen > sizeof key) {
240
		EVPerror(EVP_R_BAD_KEY_LENGTH);
241
		return 0;
242
	}
243
244
	/* Decode parameter */
245
246

92
	if (!param || (param->type != V_ASN1_SEQUENCE)) {
247
		EVPerror(EVP_R_DECODE_ERROR);
248
		return 0;
249
	}
250
251
46
	pbuf = param->value.sequence->data;
252
46
	plen = param->value.sequence->length;
253
254
46
	if (!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
255
		EVPerror(EVP_R_DECODE_ERROR);
256
		return 0;
257
	}
258
259
	/* Now check the parameters of the kdf */
260
261

46
	if (kdf->keylength &&
262
	    (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
263
		EVPerror(EVP_R_UNSUPPORTED_KEYLENGTH);
264
		goto err;
265
	}
266
267
46
	if (kdf->prf)
268
		prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
269
	else
270
		prf_nid = NID_hmacWithSHA1;
271
272
46
	if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
273
		EVPerror(EVP_R_UNSUPPORTED_PRF);
274
		goto err;
275
	}
276
277
46
	prfmd = EVP_get_digestbynid(hmac_md_nid);
278
46
	if (prfmd == NULL) {
279
		EVPerror(EVP_R_UNSUPPORTED_PRF);
280
		goto err;
281
	}
282
283
46
	if (kdf->salt->type != V_ASN1_OCTET_STRING) {
284
		EVPerror(EVP_R_UNSUPPORTED_SALT_TYPE);
285
		goto err;
286
	}
287
288
	/* it seems that its all OK */
289
46
	salt = kdf->salt->value.octet_string->data;
290
46
	saltlen = kdf->salt->value.octet_string->length;
291
46
	if ((iter = ASN1_INTEGER_get(kdf->iter)) <= 0) {
292
		EVPerror(EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
293
		goto err;
294
	}
295
46
	if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
296
46
	    keylen, key))
297
		goto err;
298
46
	rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
299
300
err:
301
46
	explicit_bzero(key, keylen);
302
46
	PBKDF2PARAM_free(kdf);
303
46
	return rv;
304
46
}
305
306
#endif