1 /* $OpenBSD: e_rc4_hmac_md5.c,v 1.4 2014/07/10 22:45:57 jsing Exp $ */
2 /* ====================================================================
3 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
54 #include <openssl/opensslconf.h>
56 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
58 #include <openssl/evp.h>
59 #include <openssl/objects.h>
60 #include <openssl/rc4.h>
61 #include <openssl/md5.h>
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
69 /* FIXME: surely this is available elsewhere? */
70 #define EVP_RC4_KEY_SIZE 16
74 MD5_CTX head, tail, md;
75 size_t payload_length;
78 #define NO_PAYLOAD_LENGTH ((size_t)-1)
80 void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out,
81 MD5_CTX *ctx, const void *inp, size_t blocks);
83 #define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data)
86 rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey,
87 const unsigned char *iv, int enc)
89 EVP_RC4_HMAC_MD5 *key = data(ctx);
91 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
93 MD5_Init(&key->head); /* handy when benchmarking */
94 key->tail = key->head;
97 key->payload_length = NO_PAYLOAD_LENGTH;
102 #if !defined(OPENSSL_NO_ASM) && defined(RC4_MD5_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
110 #if !defined(STITCHED_CALL)
116 rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
117 const unsigned char *in, size_t len)
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,
125 extern unsigned int OPENSSL_ia32cap_P[];
127 size_t plen = key->payload_length;
129 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
133 if (plen == NO_PAYLOAD_LENGTH)
135 #if defined(STITCHED_CALL)
136 /* cipher has to "fall behind" */
137 if (rc4_off > md5_off)
138 md5_off += MD5_CBLOCK;
140 if (plen > md5_off &&
141 (blocks = (plen - md5_off) / MD5_CBLOCK) &&
142 (OPENSSL_ia32cap_P[0]&(1 << 20)) == 0) {
143 MD5_Update(&key->md, in, md5_off);
144 RC4(&key->ks, rc4_off, in, out);
146 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
147 &key->md, in + md5_off, blocks);
148 blocks *= MD5_CBLOCK;
151 key->md.Nh += blocks >> 29;
152 key->md.Nl += blocks <<= 3;
153 if (key->md.Nl < (unsigned int)blocks)
160 MD5_Update(&key->md, in + md5_off, plen - md5_off);
162 if (plen!=len) { /* "TLS" mode of operation */
164 memcpy(out + rc4_off, in + rc4_off,
167 /* calculate HMAC and append it to payload */
168 MD5_Final(out + plen, &key->md);
170 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
171 MD5_Final(out + plen, &key->md);
173 /* encrypt HMAC at once */
174 RC4(&key->ks, len - rc4_off, out + rc4_off,
177 RC4(&key->ks, len - rc4_off, in + rc4_off,
181 unsigned char mac[MD5_DIGEST_LENGTH];
182 #if defined(STITCHED_CALL)
183 /* digest has to "fall behind" */
184 if (md5_off > rc4_off)
185 rc4_off += 2*MD5_CBLOCK;
187 rc4_off += MD5_CBLOCK;
189 if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
190 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
191 RC4(&key->ks, rc4_off, in, out);
192 MD5_Update(&key->md, out, md5_off);
194 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
195 &key->md, out + md5_off, blocks);
196 blocks *= MD5_CBLOCK;
199 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
203 key->md.Nh += blocks >> 29;
209 /* decrypt HMAC at once */
210 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
211 if (plen!=NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
212 MD5_Update(&key->md, out + md5_off, plen - md5_off);
214 /* calculate HMAC and verify it */
215 MD5_Final(mac, &key->md);
217 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
218 MD5_Final(mac, &key->md);
220 if (memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
223 MD5_Update(&key->md, out + md5_off, len - md5_off);
227 key->payload_length = NO_PAYLOAD_LENGTH;
233 rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
235 EVP_RC4_HMAC_MD5 *key = data(ctx);
238 case EVP_CTRL_AEAD_SET_MAC_KEY:
241 unsigned char hmac_key[64];
243 memset (hmac_key, 0, sizeof(hmac_key));
245 if (arg > (int)sizeof(hmac_key)) {
246 MD5_Init(&key->head);
247 MD5_Update(&key->head, ptr, arg);
248 MD5_Final(hmac_key, &key->head);
250 memcpy(hmac_key, ptr, arg);
253 for (i = 0; i < sizeof(hmac_key); i++)
254 hmac_key[i] ^= 0x36; /* ipad */
255 MD5_Init(&key->head);
256 MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
258 for (i = 0; i < sizeof(hmac_key); i++)
259 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
260 MD5_Init(&key->tail);
261 MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
265 case EVP_CTRL_AEAD_TLS1_AAD:
267 unsigned char *p = ptr;
268 unsigned int len = p[arg - 2] << 8 | p[arg - 1];
271 len -= MD5_DIGEST_LENGTH;
272 p[arg - 2] = len >> 8;
275 key->payload_length = len;
277 MD5_Update(&key->md, p, arg);
279 return MD5_DIGEST_LENGTH;
286 static EVP_CIPHER r4_hmac_md5_cipher = {
287 #ifdef NID_rc4_hmac_md5
292 1, EVP_RC4_KEY_SIZE, 0,
293 EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER,
294 rc4_hmac_md5_init_key,
297 sizeof(EVP_RC4_HMAC_MD5),
305 EVP_rc4_hmac_md5(void)
307 return (&r4_hmac_md5_cipher);