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/evp.h>
58 #include <openssl/objects.h>
59 #include <openssl/rc4.h>
60 #include <openssl/md5.h>
61
62 #ifndef EVP_CIPH_FLAG_AEAD_CIPHER
63 #define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000
64 #define EVP_CTRL_AEAD_TLS1_AAD 0x16
65 #define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
66 #endif
67
68 /* FIXME: surely this is available elsewhere? */
69 #define EVP_RC4_KEY_SIZE 16
70
71 typedef struct
72 {
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
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),
92 inkey);
93
94 MD5_Init(&key->head); /* handy when benchmarking */
95 key->tail = key->head;
96 key->md = key->head;
97
98 key->payload_length = NO_PAYLOAD_LENGTH;
99
100 return 1;
101 }
102
103 #if !defined(OPENSSL_NO_ASM) && ( \
104 defined(__x86_64) || defined(__x86_64__) || \
105 defined(_M_AMD64) || defined(_M_X64) || \
106 defined(__INTEL__) ) && \
107 !(defined(__APPLE__) && defined(__MACH__))
108 #define STITCHED_CALL
109 #endif
110
111 #if !defined(STITCHED_CALL)
112 #define rc4_off 0
113 #define md5_off 0
114 #endif
115
116 static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
117 const unsigned char *in, size_t len)
118 {
119 EVP_RC4_HMAC_MD5 *key = data(ctx);
120 #if defined(STITCHED_CALL)
121 size_t rc4_off = 32-1-(key->ks.x&(32-1)), /* 32 is $MOD from rc4_md5-x86_64.pl */
122 md5_off = MD5_CBLOCK-key->md.num,
123 blocks;
124 unsigned int l;
125 extern unsigned int OPENSSL_ia32cap_P[];
126 #endif
127 size_t plen = key->payload_length;
128
129 if (plen!=NO_PAYLOAD_LENGTH && len!=(plen+MD5_DIGEST_LENGTH)) return 0;
130
131 if (ctx->encrypt) {
132 if (plen==NO_PAYLOAD_LENGTH) plen = len;
133 #if defined(STITCHED_CALL)
134 /* cipher has to "fall behind" */
135 if (rc4_off>md5_off) md5_off+=MD5_CBLOCK;
136
137 if (plen>md5_off && (blocks=(plen-md5_off)/MD5_CBLOCK) &&
138 (OPENSSL_ia32cap_P[0]&(1<<20))==0) {
139 MD5_Update(&key->md,in,md5_off);
140 RC4(&key->ks,rc4_off,in,out);
141
142 rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off,
143 &key->md,in+md5_off,blocks);
144 blocks *= MD5_CBLOCK;
145 rc4_off += blocks;
146 md5_off += blocks;
147 key->md.Nh += blocks>>29;
148 key->md.Nl += blocks<<=3;
149 if (key->md.Nl<(unsigned int)blocks) key->md.Nh++;
150 } else {
151 rc4_off = 0;
152 md5_off = 0;
153 }
154 #endif
155 MD5_Update(&key->md,in+md5_off,plen-md5_off);
156
157 if (plen!=len) { /* "TLS" mode of operation */
158 if (in!=out)
159 memcpy(out+rc4_off,in+rc4_off,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 /* encrypt HMAC at once */
167 RC4(&key->ks,len-rc4_off,out+rc4_off,out+rc4_off);
168 } else {
169 RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
170 }
171 } else {
172 unsigned char mac[MD5_DIGEST_LENGTH];
173 #if defined(STITCHED_CALL)
174 /* digest has to "fall behind" */
175 if (md5_off>rc4_off) rc4_off += 2*MD5_CBLOCK;
176 else rc4_off += MD5_CBLOCK;
177
178 if (len>rc4_off && (blocks=(len-rc4_off)/MD5_CBLOCK) &&
179 (OPENSSL_ia32cap_P[0]&(1<<20))==0) {
180 RC4(&key->ks,rc4_off,in,out);
181 MD5_Update(&key->md,out,md5_off);
182
183 rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off,
184 &key->md,out+md5_off,blocks);
185 blocks *= MD5_CBLOCK;
186 rc4_off += blocks;
187 md5_off += blocks;
188 l = (key->md.Nl+(blocks<<3))&0xffffffffU;
189 if (l<key->md.Nl) key->md.Nh++;
190 key->md.Nl = l;
191 key->md.Nh += blocks>>29;
192 } else {
193 md5_off=0;
194 rc4_off=0;
195 }
196 #endif
197 /* decrypt HMAC at once */
198 RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
199 if (plen!=NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
200 MD5_Update(&key->md,out+md5_off,plen-md5_off);
201
202 /* calculate HMAC and verify it */
203 MD5_Final(mac,&key->md);
204 key->md = key->tail;
205 MD5_Update(&key->md,mac,MD5_DIGEST_LENGTH);
206 MD5_Final(mac,&key->md);
207
208 if (memcmp(out+plen,mac,MD5_DIGEST_LENGTH))
209 return 0;
210 } else {
211 MD5_Update(&key->md,out+md5_off,len-md5_off);
212 }
213 }
214
215 key->payload_length = NO_PAYLOAD_LENGTH;
216
217 return 1;
218 }
219
220 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
221 {
222 EVP_RC4_HMAC_MD5 *key = data(ctx);
223
224 switch (type)
225 {
226 case EVP_CTRL_AEAD_SET_MAC_KEY:
227 {
228 unsigned int i;
229 unsigned char hmac_key[64];
230
231 memset (hmac_key,0,sizeof(hmac_key));
232
233 if (arg > (int)sizeof(hmac_key)) {
234 MD5_Init(&key->head);
235 MD5_Update(&key->head,ptr,arg);
236 MD5_Final(hmac_key,&key->head);
237 } else {
238 memcpy(hmac_key,ptr,arg);
239 }
240
241 for (i=0;i<sizeof(hmac_key);i++)
242 hmac_key[i] ^= 0x36; /* ipad */
243 MD5_Init(&key->head);
244 MD5_Update(&key->head,hmac_key,sizeof(hmac_key));
245
246 for (i=0;i<sizeof(hmac_key);i++)
247 hmac_key[i] ^= 0x36^0x5c; /* opad */
248 MD5_Init(&key->tail);
249 MD5_Update(&key->tail,hmac_key,sizeof(hmac_key));
250
251 return 1;
252 }
253 case EVP_CTRL_AEAD_TLS1_AAD:
254 {
255 unsigned char *p=ptr;
256 unsigned int len=p[arg-2]<<8|p[arg-1];
257
258 if (!ctx->encrypt)
259 {
260 len -= MD5_DIGEST_LENGTH;
261 p[arg-2] = len>>8;
262 p[arg-1] = len;
263 }
264 key->payload_length=len;
265 key->md = key->head;
266 MD5_Update(&key->md,p,arg);
267
268 return MD5_DIGEST_LENGTH;
269 }
270 default:
271 return -1;
272 }
273 }
274
275 static EVP_CIPHER r4_hmac_md5_cipher=
276 {
277 #ifdef NID_rc4_hmac_md5
278 NID_rc4_hmac_md5,
279 #else
280 NID_undef,
281 #endif
282 1,EVP_RC4_KEY_SIZE,0,
283 EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER,
284 rc4_hmac_md5_init_key,
285 rc4_hmac_md5_cipher,
286 NULL,
287 sizeof(EVP_RC4_HMAC_MD5),
288 NULL,
289 NULL,
290 rc4_hmac_md5_ctrl,
291 NULL
292 };
293
294 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
295 {
296 return(&r4_hmac_md5_cipher);
297 }
298 #endif