2 * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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;
75 size_t plen = key->payload_length;
77 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
80 if (EVP_CIPHER_CTX_encrypting(ctx)) {
81 if (plen == NO_PAYLOAD_LENGTH)
83 # if defined(STITCHED_CALL)
84 /* cipher has to "fall behind" */
85 if (rc4_off > md5_off)
86 md5_off += MD5_CBLOCK;
88 if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
89 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
90 MD5_Update(&key->md, in, md5_off);
91 RC4(&key->ks, rc4_off, in, out);
93 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
94 &key->md, in + md5_off, blocks);
98 key->md.Nh += blocks >> 29;
99 key->md.Nl += blocks <<= 3;
100 if (key->md.Nl < (unsigned int)blocks)
107 MD5_Update(&key->md, in + md5_off, plen - md5_off);
109 if (plen != len) { /* "TLS" mode of operation */
111 memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
113 /* calculate HMAC and append it to payload */
114 MD5_Final(out + plen, &key->md);
116 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
117 MD5_Final(out + plen, &key->md);
118 /* encrypt HMAC at once */
119 RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
121 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
124 unsigned char mac[MD5_DIGEST_LENGTH];
125 # if defined(STITCHED_CALL)
126 /* digest has to "fall behind" */
127 if (md5_off > rc4_off)
128 rc4_off += 2 * MD5_CBLOCK;
130 rc4_off += MD5_CBLOCK;
132 if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
133 (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
134 RC4(&key->ks, rc4_off, in, out);
135 MD5_Update(&key->md, out, md5_off);
137 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
138 &key->md, out + md5_off, blocks);
139 blocks *= MD5_CBLOCK;
142 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
146 key->md.Nh += blocks >> 29;
152 /* decrypt HMAC at once */
153 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
154 if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
155 MD5_Update(&key->md, out + md5_off, plen - md5_off);
157 /* calculate HMAC and verify it */
158 MD5_Final(mac, &key->md);
160 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
161 MD5_Final(mac, &key->md);
163 if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
166 MD5_Update(&key->md, out + md5_off, len - md5_off);
170 key->payload_length = NO_PAYLOAD_LENGTH;
175 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
178 EVP_RC4_HMAC_MD5 *key = data(ctx);
181 case EVP_CTRL_AEAD_SET_MAC_KEY:
184 unsigned char hmac_key[64];
186 memset(hmac_key, 0, sizeof(hmac_key));
188 if (arg > (int)sizeof(hmac_key)) {
189 MD5_Init(&key->head);
190 MD5_Update(&key->head, ptr, arg);
191 MD5_Final(hmac_key, &key->head);
193 memcpy(hmac_key, ptr, arg);
196 for (i = 0; i < sizeof(hmac_key); i++)
197 hmac_key[i] ^= 0x36; /* ipad */
198 MD5_Init(&key->head);
199 MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
201 for (i = 0; i < sizeof(hmac_key); i++)
202 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
203 MD5_Init(&key->tail);
204 MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
206 OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
210 case EVP_CTRL_AEAD_TLS1_AAD:
212 unsigned char *p = ptr;
215 if (arg != EVP_AEAD_TLS1_AAD_LEN)
218 len = p[arg - 2] << 8 | p[arg - 1];
220 if (!EVP_CIPHER_CTX_encrypting(ctx)) {
221 if (len < MD5_DIGEST_LENGTH)
223 len -= MD5_DIGEST_LENGTH;
224 p[arg - 2] = len >> 8;
227 key->payload_length = len;
229 MD5_Update(&key->md, p, arg);
231 return MD5_DIGEST_LENGTH;
238 static EVP_CIPHER r4_hmac_md5_cipher = {
239 # ifdef NID_rc4_hmac_md5
244 1, EVP_RC4_KEY_SIZE, 0,
245 EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
246 EVP_CIPH_FLAG_AEAD_CIPHER,
247 rc4_hmac_md5_init_key,
250 sizeof(EVP_RC4_HMAC_MD5),
257 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
259 return &r4_hmac_md5_cipher;