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"
26 MD5_CTX head, tail, md;
27 size_t payload_length;
30 # define NO_PAYLOAD_LENGTH ((size_t)-1)
32 void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out,
33 MD5_CTX *ctx, const void *inp, size_t blocks);
35 # define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx))
37 static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
38 const unsigned char *inkey,
39 const unsigned char *iv, int enc)
41 EVP_RC4_HMAC_MD5 *key = data(ctx);
43 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
45 MD5_Init(&key->head); /* handy when benchmarking */
46 key->tail = key->head;
49 key->payload_length = NO_PAYLOAD_LENGTH;
54 # if defined(RC4_ASM) && defined(MD5_ASM) && ( \
55 defined(__x86_64) || defined(__x86_64__) || \
56 defined(_M_AMD64) || defined(_M_X64) )
57 # define STITCHED_CALL
60 # if !defined(STITCHED_CALL)
65 static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
66 const unsigned char *in, size_t len)
68 EVP_RC4_HMAC_MD5 *key = data(ctx);
69 # if defined(STITCHED_CALL)
70 size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
71 * rc4_md5-x86_64.pl */
72 md5_off = MD5_CBLOCK - key->md.num, blocks;
74 extern unsigned int OPENSSL_ia32cap_P[];
76 size_t plen = key->payload_length;
78 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
81 if (EVP_CIPHER_CTX_encrypting(ctx)) {
82 if (plen == NO_PAYLOAD_LENGTH)
84 # if defined(STITCHED_CALL)
85 /* cipher has to "fall behind" */
86 if (rc4_off > md5_off)
87 md5_off += MD5_CBLOCK;
89 if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
90 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
91 MD5_Update(&key->md, in, md5_off);
92 RC4(&key->ks, rc4_off, in, out);
94 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
95 &key->md, in + md5_off, blocks);
99 key->md.Nh += blocks >> 29;
100 key->md.Nl += blocks <<= 3;
101 if (key->md.Nl < (unsigned int)blocks)
108 MD5_Update(&key->md, in + md5_off, plen - md5_off);
110 if (plen != len) { /* "TLS" mode of operation */
112 memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
114 /* calculate HMAC and append it to payload */
115 MD5_Final(out + plen, &key->md);
117 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
118 MD5_Final(out + plen, &key->md);
119 /* encrypt HMAC at once */
120 RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
122 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
125 unsigned char mac[MD5_DIGEST_LENGTH];
126 # if defined(STITCHED_CALL)
127 /* digest has to "fall behind" */
128 if (md5_off > rc4_off)
129 rc4_off += 2 * MD5_CBLOCK;
131 rc4_off += MD5_CBLOCK;
133 if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
134 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
135 RC4(&key->ks, rc4_off, in, out);
136 MD5_Update(&key->md, out, md5_off);
138 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
139 &key->md, out + md5_off, blocks);
140 blocks *= MD5_CBLOCK;
143 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
147 key->md.Nh += blocks >> 29;
153 /* decrypt HMAC at once */
154 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
155 if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
156 MD5_Update(&key->md, out + md5_off, plen - md5_off);
158 /* calculate HMAC and verify it */
159 MD5_Final(mac, &key->md);
161 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
162 MD5_Final(mac, &key->md);
164 if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
167 MD5_Update(&key->md, out + md5_off, len - md5_off);
171 key->payload_length = NO_PAYLOAD_LENGTH;
176 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
179 EVP_RC4_HMAC_MD5 *key = data(ctx);
182 case EVP_CTRL_AEAD_SET_MAC_KEY:
185 unsigned char hmac_key[64];
187 memset(hmac_key, 0, sizeof(hmac_key));
189 if (arg > (int)sizeof(hmac_key)) {
190 MD5_Init(&key->head);
191 MD5_Update(&key->head, ptr, arg);
192 MD5_Final(hmac_key, &key->head);
194 memcpy(hmac_key, ptr, arg);
197 for (i = 0; i < sizeof(hmac_key); i++)
198 hmac_key[i] ^= 0x36; /* ipad */
199 MD5_Init(&key->head);
200 MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
202 for (i = 0; i < sizeof(hmac_key); i++)
203 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
204 MD5_Init(&key->tail);
205 MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
207 OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
211 case EVP_CTRL_AEAD_TLS1_AAD:
213 unsigned char *p = ptr;
216 if (arg != EVP_AEAD_TLS1_AAD_LEN)
219 len = p[arg - 2] << 8 | p[arg - 1];
221 if (!EVP_CIPHER_CTX_encrypting(ctx)) {
222 len -= MD5_DIGEST_LENGTH;
223 p[arg - 2] = len >> 8;
226 key->payload_length = len;
228 MD5_Update(&key->md, p, arg);
230 return MD5_DIGEST_LENGTH;
237 static EVP_CIPHER r4_hmac_md5_cipher = {
238 # ifdef NID_rc4_hmac_md5
243 1, EVP_RC4_KEY_SIZE, 0,
244 EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
245 EVP_CIPH_FLAG_AEAD_CIPHER,
246 rc4_hmac_md5_init_key,
249 sizeof(EVP_RC4_HMAC_MD5),
256 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
258 return (&r4_hmac_md5_cipher);