1 /* $OpenBSD: e_rc4_hmac_md5.c,v 1.8 2017/01/31 13:17:21 inoguchi 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 /* FIXME: surely this is available elsewhere? */ 64 #define EVP_RC4_KEY_SIZE 16 65 66 typedef struct { 67 RC4_KEY ks; 68 MD5_CTX head, tail, md; 69 size_t payload_length; 70 } EVP_RC4_HMAC_MD5; 71 72 #define NO_PAYLOAD_LENGTH ((size_t)-1) 73 74 void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out, 75 MD5_CTX *ctx, const void *inp, size_t blocks); 76 77 #define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data) 78 79 static int 80 rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey, 81 const unsigned char *iv, int enc) 82 { 83 EVP_RC4_HMAC_MD5 *key = data(ctx); 84 85 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); 86 87 MD5_Init(&key->head); /* handy when benchmarking */ 88 key->tail = key->head; 89 key->md = key->head; 90 91 key->payload_length = NO_PAYLOAD_LENGTH; 92 93 return 1; 94 } 95 96 #if !defined(OPENSSL_NO_ASM) && defined(RC4_MD5_ASM) && ( \ 97 defined(__x86_64) || defined(__x86_64__) || \ 98 defined(_M_AMD64) || defined(_M_X64) || \ 99 defined(__INTEL__) ) && \ 100 !(defined(__APPLE__) && defined(__MACH__)) 101 #define STITCHED_CALL 102 #include "x86_arch.h" 103 #endif 104 105 #if !defined(STITCHED_CALL) 106 #define rc4_off 0 107 #define md5_off 0 108 #endif 109 110 static int 111 rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 112 const unsigned char *in, size_t len) 113 { 114 EVP_RC4_HMAC_MD5 *key = data(ctx); 115 #if defined(STITCHED_CALL) 116 size_t rc4_off = 32-1-(key->ks.x&(32-1)), /* 32 is $MOD from rc4_md5-x86_64.pl */ 117 md5_off = MD5_CBLOCK - key->md.num, 118 blocks; 119 unsigned int l; 120 #endif 121 size_t plen = key->payload_length; 122 123 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) 124 return 0; 125 126 if (ctx->encrypt) { 127 if (plen == NO_PAYLOAD_LENGTH) 128 plen = len; 129 #if defined(STITCHED_CALL) 130 /* cipher has to "fall behind" */ 131 if (rc4_off > md5_off) 132 md5_off += MD5_CBLOCK; 133 134 if (plen > md5_off && 135 (blocks = (plen - md5_off) / MD5_CBLOCK) && 136 (OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 0) { 137 MD5_Update(&key->md, in, md5_off); 138 RC4(&key->ks, rc4_off, in, out); 139 140 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 141 &key->md, in + md5_off, blocks); 142 blocks *= MD5_CBLOCK; 143 rc4_off += blocks; 144 md5_off += blocks; 145 key->md.Nh += blocks >> 29; 146 key->md.Nl += blocks <<= 3; 147 if (key->md.Nl < (unsigned int)blocks) 148 key->md.Nh++; 149 } else { 150 rc4_off = 0; 151 md5_off = 0; 152 } 153 #endif 154 MD5_Update(&key->md, in + md5_off, plen - md5_off); 155 156 if (plen!=len) { /* "TLS" mode of operation */ 157 if (in != out) 158 memcpy(out + rc4_off, in + rc4_off, 159 plen - rc4_off); 160 161 /* calculate HMAC and append it to payload */ 162 MD5_Final(out + plen, &key->md); 163 key->md = key->tail; 164 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH); 165 MD5_Final(out + plen, &key->md); 166 167 /* encrypt HMAC at once */ 168 RC4(&key->ks, len - rc4_off, out + rc4_off, 169 out + rc4_off); 170 } else { 171 RC4(&key->ks, len - rc4_off, in + rc4_off, 172 out + rc4_off); 173 } 174 } else { 175 unsigned char mac[MD5_DIGEST_LENGTH]; 176 #if defined(STITCHED_CALL) 177 /* digest has to "fall behind" */ 178 if (md5_off > rc4_off) 179 rc4_off += 2*MD5_CBLOCK; 180 else 181 rc4_off += MD5_CBLOCK; 182 183 if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) && 184 (OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 0) { 185 RC4(&key->ks, rc4_off, in, out); 186 MD5_Update(&key->md, out, md5_off); 187 188 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 189 &key->md, out + md5_off, blocks); 190 blocks *= MD5_CBLOCK; 191 rc4_off += blocks; 192 md5_off += blocks; 193 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; 194 if (l < key->md.Nl) 195 key->md.Nh++; 196 key->md.Nl = l; 197 key->md.Nh += blocks >> 29; 198 } else { 199 md5_off = 0; 200 rc4_off = 0; 201 } 202 #endif 203 /* decrypt HMAC at once */ 204 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); 205 if (plen!=NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */ 206 MD5_Update(&key->md, out + md5_off, plen - md5_off); 207 208 /* calculate HMAC and verify it */ 209 MD5_Final(mac, &key->md); 210 key->md = key->tail; 211 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); 212 MD5_Final(mac, &key->md); 213 214 if (memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) 215 return 0; 216 } else { 217 MD5_Update(&key->md, out + md5_off, len - md5_off); 218 } 219 } 220 221 key->payload_length = NO_PAYLOAD_LENGTH; 222 223 return 1; 224 } 225 226 static int 227 rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 228 { 229 EVP_RC4_HMAC_MD5 *key = data(ctx); 230 231 switch (type) { 232 case EVP_CTRL_AEAD_SET_MAC_KEY: 233 { 234 unsigned int i; 235 unsigned char hmac_key[64]; 236 237 memset (hmac_key, 0, sizeof(hmac_key)); 238 239 if (arg > (int)sizeof(hmac_key)) { 240 MD5_Init(&key->head); 241 MD5_Update(&key->head, ptr, arg); 242 MD5_Final(hmac_key, &key->head); 243 } else { 244 memcpy(hmac_key, ptr, arg); 245 } 246 247 for (i = 0; i < sizeof(hmac_key); i++) 248 hmac_key[i] ^= 0x36; /* ipad */ 249 MD5_Init(&key->head); 250 MD5_Update(&key->head, hmac_key, sizeof(hmac_key)); 251 252 for (i = 0; i < sizeof(hmac_key); i++) 253 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */ 254 MD5_Init(&key->tail); 255 MD5_Update(&key->tail, hmac_key, sizeof(hmac_key)); 256 257 return 1; 258 } 259 case EVP_CTRL_AEAD_TLS1_AAD: 260 { 261 unsigned char *p = ptr; 262 unsigned int len = p[arg - 2] << 8 | p[arg - 1]; 263 264 if (!ctx->encrypt) { 265 if (len < MD5_DIGEST_LENGTH) 266 return -1; 267 len -= MD5_DIGEST_LENGTH; 268 p[arg - 2] = len >> 8; 269 p[arg - 1] = len; 270 } 271 key->payload_length = len; 272 key->md = key->head; 273 MD5_Update(&key->md, p, arg); 274 275 return MD5_DIGEST_LENGTH; 276 } 277 default: 278 return -1; 279 } 280 } 281 282 static EVP_CIPHER r4_hmac_md5_cipher = { 283 #ifdef NID_rc4_hmac_md5 284 NID_rc4_hmac_md5, 285 #else 286 NID_undef, 287 #endif 288 1, EVP_RC4_KEY_SIZE, 0, 289 EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER, 290 rc4_hmac_md5_init_key, 291 rc4_hmac_md5_cipher, 292 NULL, 293 sizeof(EVP_RC4_HMAC_MD5), 294 NULL, 295 NULL, 296 rc4_hmac_md5_ctrl, 297 NULL 298 }; 299 300 const EVP_CIPHER * 301 EVP_rc4_hmac_md5(void) 302 { 303 return (&r4_hmac_md5_cipher); 304 } 305 #endif 306