GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/evp/e_rc4_hmac_md5.c Lines: 1 107 0.9 %
Date: 2017-11-13 Branches: 0 51 0.0 %

Line Branch Exec Source
1
/* $OpenBSD: e_rc4_hmac_md5.c,v 1.8 2017/01/31 13:17:21 inoguchi Exp $ */
2
/* ====================================================================
3
 * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * 1. Redistributions of source code must retain the above copyright
10
 *    notice, this list of conditions and the following disclaimer.
11
 *
12
 * 2. Redistributions in binary form must reproduce the above copyright
13
 *    notice, this list of conditions and the following disclaimer in
14
 *    the documentation and/or other materials provided with the
15
 *    distribution.
16
 *
17
 * 3. All advertising materials mentioning features or use of this
18
 *    software must display the following acknowledgment:
19
 *    "This product includes software developed by the OpenSSL Project
20
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21
 *
22
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23
 *    endorse or promote products derived from this software without
24
 *    prior written permission. For written permission, please contact
25
 *    licensing@OpenSSL.org.
26
 *
27
 * 5. Products derived from this software may not be called "OpenSSL"
28
 *    nor may "OpenSSL" appear in their names without prior written
29
 *    permission of the OpenSSL Project.
30
 *
31
 * 6. Redistributions of any form whatsoever must retain the following
32
 *    acknowledgment:
33
 *    "This product includes software developed by the OpenSSL Project
34
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35
 *
36
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47
 * OF THE POSSIBILITY OF SUCH DAMAGE.
48
 * ====================================================================
49
 */
50
51
#include <stdio.h>
52
#include <string.h>
53
54
#include <openssl/opensslconf.h>
55
56
#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
57
58
#include <openssl/evp.h>
59
#include <openssl/objects.h>
60
#include <openssl/rc4.h>
61
#include <openssl/md5.h>
62
63
/* FIXME: surely this is available elsewhere? */
64
#define EVP_RC4_KEY_SIZE		16
65
66
typedef struct {
67
	RC4_KEY		ks;
68
	MD5_CTX		head, tail, md;
69
	size_t		payload_length;
70
} EVP_RC4_HMAC_MD5;
71
72
#define NO_PAYLOAD_LENGTH	((size_t)-1)
73
74
void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out,
75
    MD5_CTX *ctx, const void *inp, size_t blocks);
76
77
#define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data)
78
79
static int
80
rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey,
81
    const unsigned char *iv, int enc)
82
{
83
	EVP_RC4_HMAC_MD5 *key = data(ctx);
84
85
	RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
86
87
	MD5_Init(&key->head);	/* handy when benchmarking */
88
	key->tail = key->head;
89
	key->md = key->head;
90
91
	key->payload_length = NO_PAYLOAD_LENGTH;
92
93
	return 1;
94
}
95
96
#if	!defined(OPENSSL_NO_ASM) && defined(RC4_MD5_ASM) &&	( \
97
	defined(__x86_64)	|| defined(__x86_64__)	|| \
98
	defined(_M_AMD64)	|| defined(_M_X64)	|| \
99
	defined(__INTEL__)		) && \
100
	!(defined(__APPLE__) && defined(__MACH__))
101
#define	STITCHED_CALL
102
#include "x86_arch.h"
103
#endif
104
105
#if !defined(STITCHED_CALL)
106
#define	rc4_off 0
107
#define	md5_off 0
108
#endif
109
110
static int
111
rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
112
    const unsigned char *in, size_t len)
113
{
114
	EVP_RC4_HMAC_MD5 *key = data(ctx);
115
#if defined(STITCHED_CALL)
116
	size_t	rc4_off = 32-1-(key->ks.x&(32-1)),	/* 32 is $MOD from rc4_md5-x86_64.pl */
117
	md5_off = MD5_CBLOCK - key->md.num,
118
	    blocks;
119
	unsigned int l;
120
#endif
121
	size_t	plen = key->payload_length;
122
123
	if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
124
		return 0;
125
126
	if (ctx->encrypt) {
127
		if (plen == NO_PAYLOAD_LENGTH)
128
			plen = len;
129
#if defined(STITCHED_CALL)
130
		/* cipher has to "fall behind" */
131
		if (rc4_off > md5_off)
132
			md5_off += MD5_CBLOCK;
133
134
		if (plen > md5_off &&
135
		    (blocks = (plen - md5_off) / MD5_CBLOCK) &&
136
		    (OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 0) {
137
			MD5_Update(&key->md, in, md5_off);
138
			RC4(&key->ks, rc4_off, in, out);
139
140
			rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
141
			    &key->md, in + md5_off, blocks);
142
			blocks *= MD5_CBLOCK;
143
			rc4_off += blocks;
144
			md5_off += blocks;
145
			key->md.Nh += blocks >> 29;
146
			key->md.Nl += blocks <<= 3;
147
			if (key->md.Nl < (unsigned int)blocks)
148
				key->md.Nh++;
149
		} else {
150
			rc4_off = 0;
151
			md5_off = 0;
152
		}
153
#endif
154
		MD5_Update(&key->md, in + md5_off, plen - md5_off);
155
156
		if (plen!=len) {	/* "TLS" mode of operation */
157
			if (in != out)
158
				memcpy(out + rc4_off, in + rc4_off,
159
				    plen - rc4_off);
160
161
			/* calculate HMAC and append it to payload */
162
			MD5_Final(out + plen, &key->md);
163
			key->md = key->tail;
164
			MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
165
			MD5_Final(out + plen, &key->md);
166
167
			/* encrypt HMAC at once */
168
			RC4(&key->ks, len - rc4_off, out + rc4_off,
169
			    out + rc4_off);
170
		} else {
171
			RC4(&key->ks, len - rc4_off, in + rc4_off,
172
			    out + rc4_off);
173
		}
174
	} else {
175
		unsigned char mac[MD5_DIGEST_LENGTH];
176
#if defined(STITCHED_CALL)
177
		/* digest has to "fall behind" */
178
		if (md5_off > rc4_off)
179
			rc4_off += 2*MD5_CBLOCK;
180
		else
181
			rc4_off += MD5_CBLOCK;
182
183
		if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
184
		    (OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 0) {
185
			RC4(&key->ks, rc4_off, in, out);
186
			MD5_Update(&key->md, out, md5_off);
187
188
			rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
189
			    &key->md, out + md5_off, blocks);
190
			blocks *= MD5_CBLOCK;
191
			rc4_off += blocks;
192
			md5_off += blocks;
193
			l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
194
			if (l < key->md.Nl)
195
				key->md.Nh++;
196
			key->md.Nl = l;
197
			key->md.Nh += blocks >> 29;
198
		} else {
199
			md5_off = 0;
200
			rc4_off = 0;
201
		}
202
#endif
203
		/* decrypt HMAC at once */
204
		RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
205
		if (plen!=NO_PAYLOAD_LENGTH) {	/* "TLS" mode of operation */
206
			MD5_Update(&key->md, out + md5_off, plen - md5_off);
207
208
			/* calculate HMAC and verify it */
209
			MD5_Final(mac, &key->md);
210
			key->md = key->tail;
211
			MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
212
			MD5_Final(mac, &key->md);
213
214
			if (memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
215
				return 0;
216
		} else {
217
			MD5_Update(&key->md, out + md5_off, len - md5_off);
218
		}
219
	}
220
221
	key->payload_length = NO_PAYLOAD_LENGTH;
222
223
	return 1;
224
}
225
226
static int
227
rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
228
{
229
	EVP_RC4_HMAC_MD5 *key = data(ctx);
230
231
	switch (type) {
232
	case EVP_CTRL_AEAD_SET_MAC_KEY:
233
		{
234
			unsigned int  i;
235
			unsigned char hmac_key[64];
236
237
			memset (hmac_key, 0, sizeof(hmac_key));
238
239
			if (arg > (int)sizeof(hmac_key)) {
240
				MD5_Init(&key->head);
241
				MD5_Update(&key->head, ptr, arg);
242
				MD5_Final(hmac_key, &key->head);
243
			} else {
244
				memcpy(hmac_key, ptr, arg);
245
			}
246
247
			for (i = 0; i < sizeof(hmac_key); i++)
248
				hmac_key[i] ^= 0x36;		/* ipad */
249
			MD5_Init(&key->head);
250
			MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
251
252
			for (i = 0; i < sizeof(hmac_key); i++)
253
				hmac_key[i] ^= 0x36 ^ 0x5c;	/* opad */
254
			MD5_Init(&key->tail);
255
			MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
256
257
			return 1;
258
		}
259
	case EVP_CTRL_AEAD_TLS1_AAD:
260
		{
261
			unsigned char *p = ptr;
262
			unsigned int len = p[arg - 2] << 8 | p[arg - 1];
263
264
			if (!ctx->encrypt) {
265
				if (len < MD5_DIGEST_LENGTH)
266
					return -1;
267
				len -= MD5_DIGEST_LENGTH;
268
				p[arg - 2] = len >> 8;
269
				p[arg - 1] = len;
270
			}
271
			key->payload_length = len;
272
			key->md = key->head;
273
			MD5_Update(&key->md, p, arg);
274
275
			return MD5_DIGEST_LENGTH;
276
		}
277
	default:
278
		return -1;
279
	}
280
}
281
282
static EVP_CIPHER r4_hmac_md5_cipher = {
283
#ifdef NID_rc4_hmac_md5
284
	NID_rc4_hmac_md5,
285
#else
286
	NID_undef,
287
#endif
288
	1, EVP_RC4_KEY_SIZE, 0,
289
	EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER,
290
	rc4_hmac_md5_init_key,
291
	rc4_hmac_md5_cipher,
292
	NULL,
293
	sizeof(EVP_RC4_HMAC_MD5),
294
	NULL,
295
	NULL,
296
	rc4_hmac_md5_ctrl,
297
	NULL
298
};
299
300
const EVP_CIPHER *
301
EVP_rc4_hmac_md5(void)
302
{
303
8610
	return (&r4_hmac_md5_cipher);
304
}
305
#endif