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62867571 RS |
1 | /* |
2 | * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved. | |
c608171d | 3 | * |
4a8b0c55 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
62867571 RS |
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 | |
c608171d AP |
8 | */ |
9 | ||
f702256d | 10 | #include <internal/cryptlib.h> |
c608171d AP |
11 | #include <openssl/opensslconf.h> |
12 | ||
13 | #include <stdio.h> | |
14 | #include <string.h> | |
15 | ||
16 | #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5) | |
17 | ||
1e4a355d | 18 | # include <openssl/crypto.h> |
0f113f3e MC |
19 | # include <openssl/evp.h> |
20 | # include <openssl/objects.h> | |
21 | # include <openssl/rc4.h> | |
22 | # include <openssl/md5.h> | |
25f2138b | 23 | # include "crypto/evp.h" |
0f113f3e | 24 | |
0f113f3e MC |
25 | typedef struct { |
26 | RC4_KEY ks; | |
27 | MD5_CTX head, tail, md; | |
28 | size_t payload_length; | |
29 | } EVP_RC4_HMAC_MD5; | |
c608171d | 30 | |
0f113f3e | 31 | # define NO_PAYLOAD_LENGTH ((size_t)-1) |
6dd9b0fc | 32 | |
0f113f3e MC |
33 | void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out, |
34 | MD5_CTX *ctx, const void *inp, size_t blocks); | |
c608171d | 35 | |
44ab2dfd | 36 | # define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx)) |
c608171d AP |
37 | |
38 | static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, | |
0f113f3e MC |
39 | const unsigned char *inkey, |
40 | const unsigned char *iv, int enc) | |
41 | { | |
42 | EVP_RC4_HMAC_MD5 *key = data(ctx); | |
c608171d | 43 | |
0f113f3e | 44 | RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); |
c608171d | 45 | |
0f113f3e MC |
46 | MD5_Init(&key->head); /* handy when benchmarking */ |
47 | key->tail = key->head; | |
48 | key->md = key->head; | |
c608171d | 49 | |
0f113f3e | 50 | key->payload_length = NO_PAYLOAD_LENGTH; |
c608171d | 51 | |
0f113f3e MC |
52 | return 1; |
53 | } | |
c608171d | 54 | |
dd6b2706 | 55 | # if defined(RC4_ASM) && defined(MD5_ASM) && ( \ |
0f113f3e | 56 | defined(__x86_64) || defined(__x86_64__) || \ |
b1a07c38 | 57 | defined(_M_AMD64) || defined(_M_X64) ) |
0f113f3e MC |
58 | # define STITCHED_CALL |
59 | # endif | |
c608171d | 60 | |
0f113f3e MC |
61 | # if !defined(STITCHED_CALL) |
62 | # define rc4_off 0 | |
63 | # define md5_off 0 | |
64 | # endif | |
c608171d AP |
65 | |
66 | static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
0f113f3e MC |
67 | const unsigned char *in, size_t len) |
68 | { | |
69 | EVP_RC4_HMAC_MD5 *key = data(ctx); | |
70 | # if defined(STITCHED_CALL) | |
71 | size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from | |
72 | * rc4_md5-x86_64.pl */ | |
73 | md5_off = MD5_CBLOCK - key->md.num, blocks; | |
74 | unsigned int l; | |
0f113f3e MC |
75 | # endif |
76 | size_t plen = key->payload_length; | |
77 | ||
78 | if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) | |
79 | return 0; | |
80 | ||
936166af | 81 | if (EVP_CIPHER_CTX_encrypting(ctx)) { |
0f113f3e MC |
82 | if (plen == NO_PAYLOAD_LENGTH) |
83 | plen = len; | |
84 | # if defined(STITCHED_CALL) | |
85 | /* cipher has to "fall behind" */ | |
86 | if (rc4_off > md5_off) | |
87 | md5_off += MD5_CBLOCK; | |
88 | ||
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); | |
93 | ||
94 | rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, | |
95 | &key->md, in + md5_off, blocks); | |
96 | blocks *= MD5_CBLOCK; | |
97 | rc4_off += blocks; | |
98 | md5_off += blocks; | |
99 | key->md.Nh += blocks >> 29; | |
100 | key->md.Nl += blocks <<= 3; | |
101 | if (key->md.Nl < (unsigned int)blocks) | |
102 | key->md.Nh++; | |
103 | } else { | |
104 | rc4_off = 0; | |
105 | md5_off = 0; | |
106 | } | |
107 | # endif | |
108 | MD5_Update(&key->md, in + md5_off, plen - md5_off); | |
109 | ||
110 | if (plen != len) { /* "TLS" mode of operation */ | |
111 | if (in != out) | |
112 | memcpy(out + rc4_off, in + rc4_off, plen - rc4_off); | |
113 | ||
114 | /* calculate HMAC and append it to payload */ | |
115 | MD5_Final(out + plen, &key->md); | |
116 | key->md = key->tail; | |
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); | |
121 | } else { | |
122 | RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); | |
123 | } | |
124 | } else { | |
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; | |
130 | else | |
131 | rc4_off += MD5_CBLOCK; | |
132 | ||
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); | |
137 | ||
138 | rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, | |
139 | &key->md, out + md5_off, blocks); | |
140 | blocks *= MD5_CBLOCK; | |
141 | rc4_off += blocks; | |
142 | md5_off += blocks; | |
143 | l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; | |
144 | if (l < key->md.Nl) | |
145 | key->md.Nh++; | |
146 | key->md.Nl = l; | |
147 | key->md.Nh += blocks >> 29; | |
148 | } else { | |
149 | md5_off = 0; | |
150 | rc4_off = 0; | |
151 | } | |
152 | # endif | |
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); | |
157 | ||
158 | /* calculate HMAC and verify it */ | |
159 | MD5_Final(mac, &key->md); | |
160 | key->md = key->tail; | |
161 | MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); | |
162 | MD5_Final(mac, &key->md); | |
163 | ||
1e4a355d | 164 | if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) |
0f113f3e MC |
165 | return 0; |
166 | } else { | |
167 | MD5_Update(&key->md, out + md5_off, len - md5_off); | |
168 | } | |
169 | } | |
170 | ||
171 | key->payload_length = NO_PAYLOAD_LENGTH; | |
172 | ||
173 | return 1; | |
174 | } | |
175 | ||
176 | static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, | |
177 | void *ptr) | |
178 | { | |
179 | EVP_RC4_HMAC_MD5 *key = data(ctx); | |
180 | ||
181 | switch (type) { | |
182 | case EVP_CTRL_AEAD_SET_MAC_KEY: | |
183 | { | |
184 | unsigned int i; | |
185 | unsigned char hmac_key[64]; | |
186 | ||
187 | memset(hmac_key, 0, sizeof(hmac_key)); | |
188 | ||
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); | |
193 | } else { | |
194 | memcpy(hmac_key, ptr, arg); | |
195 | } | |
196 | ||
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)); | |
201 | ||
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)); | |
206 | ||
0def528b MC |
207 | OPENSSL_cleanse(hmac_key, sizeof(hmac_key)); |
208 | ||
0f113f3e MC |
209 | return 1; |
210 | } | |
211 | case EVP_CTRL_AEAD_TLS1_AAD: | |
212 | { | |
213 | unsigned char *p = ptr; | |
c8269881 MC |
214 | unsigned int len; |
215 | ||
216 | if (arg != EVP_AEAD_TLS1_AAD_LEN) | |
217 | return -1; | |
218 | ||
219 | len = p[arg - 2] << 8 | p[arg - 1]; | |
0f113f3e | 220 | |
936166af | 221 | if (!EVP_CIPHER_CTX_encrypting(ctx)) { |
8e204996 AP |
222 | if (len < MD5_DIGEST_LENGTH) |
223 | return -1; | |
0f113f3e MC |
224 | len -= MD5_DIGEST_LENGTH; |
225 | p[arg - 2] = len >> 8; | |
226 | p[arg - 1] = len; | |
227 | } | |
228 | key->payload_length = len; | |
229 | key->md = key->head; | |
230 | MD5_Update(&key->md, p, arg); | |
231 | ||
232 | return MD5_DIGEST_LENGTH; | |
233 | } | |
234 | default: | |
235 | return -1; | |
236 | } | |
237 | } | |
238 | ||
239 | static EVP_CIPHER r4_hmac_md5_cipher = { | |
240 | # ifdef NID_rc4_hmac_md5 | |
241 | NID_rc4_hmac_md5, | |
242 | # else | |
243 | NID_undef, | |
244 | # endif | |
245 | 1, EVP_RC4_KEY_SIZE, 0, | |
246 | EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH | | |
247 | EVP_CIPH_FLAG_AEAD_CIPHER, | |
248 | rc4_hmac_md5_init_key, | |
249 | rc4_hmac_md5_cipher, | |
250 | NULL, | |
251 | sizeof(EVP_RC4_HMAC_MD5), | |
252 | NULL, | |
253 | NULL, | |
254 | rc4_hmac_md5_ctrl, | |
255 | NULL | |
256 | }; | |
c608171d AP |
257 | |
258 | const EVP_CIPHER *EVP_rc4_hmac_md5(void) | |
0f113f3e | 259 | { |
26a7d938 | 260 | return &r4_hmac_md5_cipher; |
0f113f3e | 261 | } |
c608171d | 262 | #endif |