Line data Source code
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 :
85 0 : 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 0 : EVP_RC4_HMAC_MD5 *key = data(ctx);
90 :
91 0 : RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
92 :
93 0 : MD5_Init(&key->head); /* handy when benchmarking */
94 0 : key->tail = key->head;
95 0 : key->md = key->head;
96 :
97 0 : key->payload_length = NO_PAYLOAD_LENGTH;
98 :
99 0 : 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 :
115 0 : static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
116 : const unsigned char *in, size_t len)
117 : {
118 0 : 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 0 : size_t plen = key->payload_length;
127 :
128 0 : if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
129 : return 0;
130 :
131 0 : if (ctx->encrypt) {
132 0 : 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 0 : MD5_Update(&key->md, in + md5_off, plen - md5_off);
159 :
160 0 : if (plen != len) { /* "TLS" mode of operation */
161 0 : if (in != out)
162 : memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
163 :
164 : /* calculate HMAC and append it to payload */
165 0 : MD5_Final(out + plen, &key->md);
166 0 : key->md = key->tail;
167 0 : MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
168 0 : MD5_Final(out + plen, &key->md);
169 : /* encrypt HMAC at once */
170 0 : RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
171 : } else {
172 0 : 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 0 : RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
205 0 : if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
206 0 : MD5_Update(&key->md, out + md5_off, plen - md5_off);
207 :
208 : /* calculate HMAC and verify it */
209 0 : MD5_Final(mac, &key->md);
210 0 : key->md = key->tail;
211 0 : MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
212 0 : MD5_Final(mac, &key->md);
213 :
214 0 : if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
215 0 : return 0;
216 : } else {
217 0 : MD5_Update(&key->md, out + md5_off, len - md5_off);
218 : }
219 : }
220 :
221 0 : key->payload_length = NO_PAYLOAD_LENGTH;
222 :
223 0 : return 1;
224 : }
225 :
226 0 : static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
227 : void *ptr)
228 : {
229 0 : EVP_RC4_HMAC_MD5 *key = data(ctx);
230 :
231 0 : 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 0 : if (arg > (int)sizeof(hmac_key)) {
240 0 : MD5_Init(&key->head);
241 0 : MD5_Update(&key->head, ptr, arg);
242 0 : MD5_Final(hmac_key, &key->head);
243 : } else {
244 0 : memcpy(hmac_key, ptr, arg);
245 : }
246 :
247 0 : for (i = 0; i < sizeof(hmac_key); i++)
248 0 : hmac_key[i] ^= 0x36; /* ipad */
249 0 : MD5_Init(&key->head);
250 0 : MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
251 :
252 0 : for (i = 0; i < sizeof(hmac_key); i++)
253 0 : hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
254 0 : MD5_Init(&key->tail);
255 0 : 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 0 : if (arg != EVP_AEAD_TLS1_AAD_LEN)
265 : return -1;
266 :
267 0 : len = p[arg - 2] << 8 | p[arg - 1];
268 :
269 0 : if (!ctx->encrypt) {
270 0 : len -= MD5_DIGEST_LENGTH;
271 0 : p[arg - 2] = len >> 8;
272 0 : p[arg - 1] = len;
273 : }
274 0 : key->payload_length = len;
275 0 : key->md = key->head;
276 0 : MD5_Update(&key->md, p, arg);
277 :
278 0 : 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 :
304 242 : const EVP_CIPHER *EVP_rc4_hmac_md5(void)
305 : {
306 242 : return (&r4_hmac_md5_cipher);
307 : }
308 : #endif
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