1 /* ====================================================================
2 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
20 *
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * licensing@OpenSSL.org.
25 *
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
29 *
30 * 6. Redistributions of any form whatsoever must retain the following
31 * acknowledgment:
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
48 */
49
50 #include <openssl/opensslconf.h>
51
52 #include <stdio.h>
53 #include <string.h>
54
55 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
56
57 # include <openssl/crypto.h>
58 # include <openssl/evp.h>
59 # include <openssl/objects.h>
60 # include <openssl/rc4.h>
61 # include <openssl/md5.h>
62
63 # ifndef EVP_CIPH_FLAG_AEAD_CIPHER
64 # define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000
65 # define EVP_CTRL_AEAD_TLS1_AAD 0x16
66 # define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
67 # endif
68
69 /* FIXME: surely this is available elsewhere? */
70 # define EVP_RC4_KEY_SIZE 16
71
72 typedef struct {
73 RC4_KEY ks;
74 MD5_CTX head, tail, md;
75 size_t payload_length;
76 } EVP_RC4_HMAC_MD5;
77
78 # define NO_PAYLOAD_LENGTH ((size_t)-1)
79
80 void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out,
81 MD5_CTX *ctx, const void *inp, size_t blocks);
82
83 # define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data)
84
rc4_hmac_md5_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * inkey,const unsigned char * iv,int enc)85 static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
86 const unsigned char *inkey,
87 const unsigned char *iv, int enc)
88 {
89 EVP_RC4_HMAC_MD5 *key = data(ctx);
90
91 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
92
93 MD5_Init(&key->head); /* handy when benchmarking */
94 key->tail = key->head;
95 key->md = key->head;
96
97 key->payload_length = NO_PAYLOAD_LENGTH;
98
99 return 1;
100 }
101
102 # if !defined(OPENSSL_NO_ASM) && ( \
103 defined(__x86_64) || defined(__x86_64__) || \
104 defined(_M_AMD64) || defined(_M_X64) || \
105 defined(__INTEL__) ) && \
106 !(defined(__APPLE__) && defined(__MACH__))
107 # define STITCHED_CALL
108 # endif
109
110 # if !defined(STITCHED_CALL)
111 # define rc4_off 0
112 # define md5_off 0
113 # endif
114
rc4_hmac_md5_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t len)115 static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
116 const unsigned char *in, size_t len)
117 {
118 EVP_RC4_HMAC_MD5 *key = data(ctx);
119 # if defined(STITCHED_CALL)
120 size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
121 * rc4_md5-x86_64.pl */
122 md5_off = MD5_CBLOCK - key->md.num, blocks;
123 unsigned int l;
124 extern unsigned int OPENSSL_ia32cap_P[];
125 # endif
126 size_t plen = key->payload_length;
127
128 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
129 return 0;
130
131 if (ctx->encrypt) {
132 if (plen == NO_PAYLOAD_LENGTH)
133 plen = len;
134 # if defined(STITCHED_CALL)
135 /* cipher has to "fall behind" */
136 if (rc4_off > md5_off)
137 md5_off += MD5_CBLOCK;
138
139 if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
140 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
141 MD5_Update(&key->md, in, md5_off);
142 RC4(&key->ks, rc4_off, in, out);
143
144 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
145 &key->md, in + md5_off, blocks);
146 blocks *= MD5_CBLOCK;
147 rc4_off += blocks;
148 md5_off += blocks;
149 key->md.Nh += blocks >> 29;
150 key->md.Nl += blocks <<= 3;
151 if (key->md.Nl < (unsigned int)blocks)
152 key->md.Nh++;
153 } else {
154 rc4_off = 0;
155 md5_off = 0;
156 }
157 # endif
158 MD5_Update(&key->md, in + md5_off, plen - md5_off);
159
160 if (plen != len) { /* "TLS" mode of operation */
161 if (in != out)
162 memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
163
164 /* calculate HMAC and append it to payload */
165 MD5_Final(out + plen, &key->md);
166 key->md = key->tail;
167 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
168 MD5_Final(out + plen, &key->md);
169 /* encrypt HMAC at once */
170 RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
171 } else {
172 RC4(&key->ks, len - rc4_off, in + rc4_off, 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_ia32cap_P[0] & (1 << 20)) == 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 (CRYPTO_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
rc4_hmac_md5_ctrl(EVP_CIPHER_CTX * ctx,int type,int arg,void * ptr)226 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
227 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;
263
264 if (arg != EVP_AEAD_TLS1_AAD_LEN)
265 return -1;
266
267 len = p[arg - 2] << 8 | p[arg - 1];
268
269 if (!ctx->encrypt) {
270 len -= MD5_DIGEST_LENGTH;
271 p[arg - 2] = len >> 8;
272 p[arg - 1] = len;
273 }
274 key->payload_length = len;
275 key->md = key->head;
276 MD5_Update(&key->md, p, arg);
277
278 return MD5_DIGEST_LENGTH;
279 }
280 default:
281 return -1;
282 }
283 }
284
285 static EVP_CIPHER r4_hmac_md5_cipher = {
286 # ifdef NID_rc4_hmac_md5
287 NID_rc4_hmac_md5,
288 # else
289 NID_undef,
290 # endif
291 1, EVP_RC4_KEY_SIZE, 0,
292 EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
293 EVP_CIPH_FLAG_AEAD_CIPHER,
294 rc4_hmac_md5_init_key,
295 rc4_hmac_md5_cipher,
296 NULL,
297 sizeof(EVP_RC4_HMAC_MD5),
298 NULL,
299 NULL,
300 rc4_hmac_md5_ctrl,
301 NULL
302 };
303
EVP_rc4_hmac_md5(void)304 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
305 {
306 return (&r4_hmac_md5_cipher);
307 }
308 #endif
309