2 * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/opensslconf.h>
15 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
17 # include <openssl/crypto.h>
18 # include <openssl/evp.h>
19 # include <openssl/objects.h>
20 # include <openssl/rc4.h>
21 # include <openssl/md5.h>
22 # include "internal/evp_int.h"
24 # ifndef EVP_CIPH_FLAG_AEAD_CIPHER
25 # define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000
26 # define EVP_CTRL_AEAD_TLS1_AAD 0x16
27 # define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
30 /* FIXME: surely this is available elsewhere? */
31 # define EVP_RC4_KEY_SIZE 16
35 MD5_CTX head, tail, md;
36 size_t payload_length;
39 # define NO_PAYLOAD_LENGTH ((size_t)-1)
41 void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out,
42 MD5_CTX *ctx, const void *inp, size_t blocks);
44 # define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx))
46 static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
47 const unsigned char *inkey,
48 const unsigned char *iv, int enc)
50 EVP_RC4_HMAC_MD5 *key = data(ctx);
52 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
54 MD5_Init(&key->head); /* handy when benchmarking */
55 key->tail = key->head;
58 key->payload_length = NO_PAYLOAD_LENGTH;
63 # if defined(RC4_ASM) && defined(MD5_ASM) && ( \
64 defined(__x86_64) || defined(__x86_64__) || \
65 defined(_M_AMD64) || defined(_M_X64) )
66 # define STITCHED_CALL
69 # if !defined(STITCHED_CALL)
74 static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
75 const unsigned char *in, size_t len)
77 EVP_RC4_HMAC_MD5 *key = data(ctx);
78 # if defined(STITCHED_CALL)
79 size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
80 * rc4_md5-x86_64.pl */
81 md5_off = MD5_CBLOCK - key->md.num, blocks;
83 extern unsigned int OPENSSL_ia32cap_P[];
85 size_t plen = key->payload_length;
87 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
90 if (EVP_CIPHER_CTX_encrypting(ctx)) {
91 if (plen == NO_PAYLOAD_LENGTH)
93 # if defined(STITCHED_CALL)
94 /* cipher has to "fall behind" */
95 if (rc4_off > md5_off)
96 md5_off += MD5_CBLOCK;
98 if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
99 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
100 MD5_Update(&key->md, in, md5_off);
101 RC4(&key->ks, rc4_off, in, out);
103 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
104 &key->md, in + md5_off, blocks);
105 blocks *= MD5_CBLOCK;
108 key->md.Nh += blocks >> 29;
109 key->md.Nl += blocks <<= 3;
110 if (key->md.Nl < (unsigned int)blocks)
117 MD5_Update(&key->md, in + md5_off, plen - md5_off);
119 if (plen != len) { /* "TLS" mode of operation */
121 memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
123 /* calculate HMAC and append it to payload */
124 MD5_Final(out + plen, &key->md);
126 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
127 MD5_Final(out + plen, &key->md);
128 /* encrypt HMAC at once */
129 RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
131 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
134 unsigned char mac[MD5_DIGEST_LENGTH];
135 # if defined(STITCHED_CALL)
136 /* digest has to "fall behind" */
137 if (md5_off > rc4_off)
138 rc4_off += 2 * MD5_CBLOCK;
140 rc4_off += MD5_CBLOCK;
142 if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
143 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
144 RC4(&key->ks, rc4_off, in, out);
145 MD5_Update(&key->md, out, md5_off);
147 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
148 &key->md, out + md5_off, blocks);
149 blocks *= MD5_CBLOCK;
152 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
156 key->md.Nh += blocks >> 29;
162 /* decrypt HMAC at once */
163 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
164 if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
165 MD5_Update(&key->md, out + md5_off, plen - md5_off);
167 /* calculate HMAC and verify it */
168 MD5_Final(mac, &key->md);
170 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
171 MD5_Final(mac, &key->md);
173 if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
176 MD5_Update(&key->md, out + md5_off, len - md5_off);
180 key->payload_length = NO_PAYLOAD_LENGTH;
185 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
188 EVP_RC4_HMAC_MD5 *key = data(ctx);
191 case EVP_CTRL_AEAD_SET_MAC_KEY:
194 unsigned char hmac_key[64];
196 memset(hmac_key, 0, sizeof(hmac_key));
198 if (arg > (int)sizeof(hmac_key)) {
199 MD5_Init(&key->head);
200 MD5_Update(&key->head, ptr, arg);
201 MD5_Final(hmac_key, &key->head);
203 memcpy(hmac_key, ptr, arg);
206 for (i = 0; i < sizeof(hmac_key); i++)
207 hmac_key[i] ^= 0x36; /* ipad */
208 MD5_Init(&key->head);
209 MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
211 for (i = 0; i < sizeof(hmac_key); i++)
212 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
213 MD5_Init(&key->tail);
214 MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
216 OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
220 case EVP_CTRL_AEAD_TLS1_AAD:
222 unsigned char *p = ptr;
225 if (arg != EVP_AEAD_TLS1_AAD_LEN)
228 len = p[arg - 2] << 8 | p[arg - 1];
230 if (!EVP_CIPHER_CTX_encrypting(ctx)) {
231 len -= MD5_DIGEST_LENGTH;
232 p[arg - 2] = len >> 8;
235 key->payload_length = len;
237 MD5_Update(&key->md, p, arg);
239 return MD5_DIGEST_LENGTH;
246 static EVP_CIPHER r4_hmac_md5_cipher = {
247 # ifdef NID_rc4_hmac_md5
252 1, EVP_RC4_KEY_SIZE, 0,
253 EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
254 EVP_CIPH_FLAG_AEAD_CIPHER,
255 rc4_hmac_md5_init_key,
258 sizeof(EVP_RC4_HMAC_MD5),
265 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
267 return (&r4_hmac_md5_cipher);