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. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 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 15 * distribution. 16 * 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/)" 21 * 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. 26 * 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. 30 * 31 * 6. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 35 * 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 * ==================================================================== 49 */ 50 51 #include <stdio.h> 52 #include <string.h> 53 54 #include <openssl/opensslconf.h> 55 56 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5) 57 58 #include <openssl/evp.h> 59 #include <openssl/objects.h> 60 #include <openssl/rc4.h> 61 #include <openssl/md5.h> 62 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 67 #endif 68 69 /* FIXME: surely this is available elsewhere? */ 70 #define EVP_RC4_KEY_SIZE 16 71 72 typedef struct { 73 RC4_KEY ks; 74 MD5_CTX head, tail, md; 75 size_t payload_length; 76 } EVP_RC4_HMAC_MD5; 77 78 #define NO_PAYLOAD_LENGTH ((size_t)-1) 79 80 void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out, 81 MD5_CTX *ctx, const void *inp, size_t blocks); 82 83 #define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data) 84 85 static int 86 rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey, 87 const unsigned char *iv, int enc) 88 { 89 EVP_RC4_HMAC_MD5 *key = data(ctx); 90 91 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); 92 93 MD5_Init(&key->head); /* handy when benchmarking */ 94 key->tail = key->head; 95 key->md = key->head; 96 97 key->payload_length = NO_PAYLOAD_LENGTH; 98 99 return 1; 100 } 101 102 #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 108 #endif 109 110 #if !defined(STITCHED_CALL) 111 #define rc4_off 0 112 #define md5_off 0 113 #endif 114 115 static int 116 rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 117 const unsigned char *in, size_t len) 118 { 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, 123 blocks; 124 unsigned int l; 125 extern unsigned int OPENSSL_ia32cap_P[]; 126 #endif 127 size_t plen = key->payload_length; 128 129 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) 130 return 0; 131 132 if (ctx->encrypt) { 133 if (plen == NO_PAYLOAD_LENGTH) 134 plen = len; 135 #if defined(STITCHED_CALL) 136 /* cipher has to "fall behind" */ 137 if (rc4_off > md5_off) 138 md5_off += MD5_CBLOCK; 139 140 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); 145 146 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 147 &key->md, in + md5_off, blocks); 148 blocks *= MD5_CBLOCK; 149 rc4_off += blocks; 150 md5_off += blocks; 151 key->md.Nh += blocks >> 29; 152 key->md.Nl += blocks <<= 3; 153 if (key->md.Nl < (unsigned int)blocks) 154 key->md.Nh++; 155 } else { 156 rc4_off = 0; 157 md5_off = 0; 158 } 159 #endif 160 MD5_Update(&key->md, in + md5_off, plen - md5_off); 161 162 if (plen!=len) { /* "TLS" mode of operation */ 163 if (in != out) 164 memcpy(out + rc4_off, in + rc4_off, 165 plen - rc4_off); 166 167 /* calculate HMAC and append it to payload */ 168 MD5_Final(out + plen, &key->md); 169 key->md = key->tail; 170 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH); 171 MD5_Final(out + plen, &key->md); 172 173 /* encrypt HMAC at once */ 174 RC4(&key->ks, len - rc4_off, out + rc4_off, 175 out + rc4_off); 176 } else { 177 RC4(&key->ks, len - rc4_off, in + rc4_off, 178 out + rc4_off); 179 } 180 } else { 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; 186 else 187 rc4_off += MD5_CBLOCK; 188 189 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); 193 194 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 195 &key->md, out + md5_off, blocks); 196 blocks *= MD5_CBLOCK; 197 rc4_off += blocks; 198 md5_off += blocks; 199 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; 200 if (l < key->md.Nl) 201 key->md.Nh++; 202 key->md.Nl = l; 203 key->md.Nh += blocks >> 29; 204 } else { 205 md5_off = 0; 206 rc4_off = 0; 207 } 208 #endif 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); 213 214 /* calculate HMAC and verify it */ 215 MD5_Final(mac, &key->md); 216 key->md = key->tail; 217 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); 218 MD5_Final(mac, &key->md); 219 220 if (memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) 221 return 0; 222 } else { 223 MD5_Update(&key->md, out + md5_off, len - md5_off); 224 } 225 } 226 227 key->payload_length = NO_PAYLOAD_LENGTH; 228 229 return 1; 230 } 231 232 static int 233 rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 234 { 235 EVP_RC4_HMAC_MD5 *key = data(ctx); 236 237 switch (type) { 238 case EVP_CTRL_AEAD_SET_MAC_KEY: 239 { 240 unsigned int i; 241 unsigned char hmac_key[64]; 242 243 memset (hmac_key, 0, sizeof(hmac_key)); 244 245 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); 249 } else { 250 memcpy(hmac_key, ptr, arg); 251 } 252 253 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)); 257 258 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)); 262 263 return 1; 264 } 265 case EVP_CTRL_AEAD_TLS1_AAD: 266 { 267 unsigned char *p = ptr; 268 unsigned int len = p[arg - 2] << 8 | p[arg - 1]; 269 270 if (!ctx->encrypt) { 271 len -= MD5_DIGEST_LENGTH; 272 p[arg - 2] = len >> 8; 273 p[arg - 1] = len; 274 } 275 key->payload_length = len; 276 key->md = key->head; 277 MD5_Update(&key->md, p, arg); 278 279 return MD5_DIGEST_LENGTH; 280 } 281 default: 282 return -1; 283 } 284 } 285 286 static EVP_CIPHER r4_hmac_md5_cipher = { 287 #ifdef NID_rc4_hmac_md5 288 NID_rc4_hmac_md5, 289 #else 290 NID_undef, 291 #endif 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, 295 rc4_hmac_md5_cipher, 296 NULL, 297 sizeof(EVP_RC4_HMAC_MD5), 298 NULL, 299 NULL, 300 rc4_hmac_md5_ctrl, 301 NULL 302 }; 303 304 const EVP_CIPHER * 305 EVP_rc4_hmac_md5(void) 306 { 307 return (&r4_hmac_md5_cipher); 308 } 309 #endif 310