1 /* $OpenBSD: e_rc4_hmac_md5.c,v 1.9 2021/12/12 21:30:13 tb 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 #include "evp_locl.h" 64 65 /* FIXME: surely this is available elsewhere? */ 66 #define EVP_RC4_KEY_SIZE 16 67 68 typedef struct { 69 RC4_KEY ks; 70 MD5_CTX head, tail, md; 71 size_t payload_length; 72 } EVP_RC4_HMAC_MD5; 73 74 #define NO_PAYLOAD_LENGTH ((size_t)-1) 75 76 void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out, 77 MD5_CTX *ctx, const void *inp, size_t blocks); 78 79 #define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data) 80 81 static int 82 rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey, 83 const unsigned char *iv, int enc) 84 { 85 EVP_RC4_HMAC_MD5 *key = data(ctx); 86 87 RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); 88 89 MD5_Init(&key->head); /* handy when benchmarking */ 90 key->tail = key->head; 91 key->md = key->head; 92 93 key->payload_length = NO_PAYLOAD_LENGTH; 94 95 return 1; 96 } 97 98 #if !defined(OPENSSL_NO_ASM) && defined(RC4_MD5_ASM) && ( \ 99 defined(__x86_64) || defined(__x86_64__) || \ 100 defined(_M_AMD64) || defined(_M_X64) || \ 101 defined(__INTEL__) ) && \ 102 !(defined(__APPLE__) && defined(__MACH__)) 103 #define STITCHED_CALL 104 #include "x86_arch.h" 105 #endif 106 107 #if !defined(STITCHED_CALL) 108 #define rc4_off 0 109 #define md5_off 0 110 #endif 111 112 static int 113 rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 114 const unsigned char *in, size_t len) 115 { 116 EVP_RC4_HMAC_MD5 *key = data(ctx); 117 #if defined(STITCHED_CALL) 118 size_t rc4_off = 32-1-(key->ks.x&(32-1)), /* 32 is $MOD from rc4_md5-x86_64.pl */ 119 md5_off = MD5_CBLOCK - key->md.num, 120 blocks; 121 unsigned int l; 122 #endif 123 size_t plen = key->payload_length; 124 125 if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) 126 return 0; 127 128 if (ctx->encrypt) { 129 if (plen == NO_PAYLOAD_LENGTH) 130 plen = len; 131 #if defined(STITCHED_CALL) 132 /* cipher has to "fall behind" */ 133 if (rc4_off > md5_off) 134 md5_off += MD5_CBLOCK; 135 136 if (plen > md5_off && 137 (blocks = (plen - md5_off) / MD5_CBLOCK) && 138 (OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 0) { 139 MD5_Update(&key->md, in, md5_off); 140 RC4(&key->ks, rc4_off, in, out); 141 142 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 143 &key->md, in + md5_off, blocks); 144 blocks *= MD5_CBLOCK; 145 rc4_off += blocks; 146 md5_off += blocks; 147 key->md.Nh += blocks >> 29; 148 key->md.Nl += blocks <<= 3; 149 if (key->md.Nl < (unsigned int)blocks) 150 key->md.Nh++; 151 } else { 152 rc4_off = 0; 153 md5_off = 0; 154 } 155 #endif 156 MD5_Update(&key->md, in + md5_off, plen - md5_off); 157 158 if (plen!=len) { /* "TLS" mode of operation */ 159 if (in != out) 160 memcpy(out + rc4_off, in + rc4_off, 161 plen - rc4_off); 162 163 /* calculate HMAC and append it to payload */ 164 MD5_Final(out + plen, &key->md); 165 key->md = key->tail; 166 MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH); 167 MD5_Final(out + plen, &key->md); 168 169 /* encrypt HMAC at once */ 170 RC4(&key->ks, len - rc4_off, out + rc4_off, 171 out + rc4_off); 172 } else { 173 RC4(&key->ks, len - rc4_off, in + rc4_off, 174 out + rc4_off); 175 } 176 } else { 177 unsigned char mac[MD5_DIGEST_LENGTH]; 178 #if defined(STITCHED_CALL) 179 /* digest has to "fall behind" */ 180 if (md5_off > rc4_off) 181 rc4_off += 2*MD5_CBLOCK; 182 else 183 rc4_off += MD5_CBLOCK; 184 185 if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) && 186 (OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 0) { 187 RC4(&key->ks, rc4_off, in, out); 188 MD5_Update(&key->md, out, md5_off); 189 190 rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 191 &key->md, out + md5_off, blocks); 192 blocks *= MD5_CBLOCK; 193 rc4_off += blocks; 194 md5_off += blocks; 195 l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; 196 if (l < key->md.Nl) 197 key->md.Nh++; 198 key->md.Nl = l; 199 key->md.Nh += blocks >> 29; 200 } else { 201 md5_off = 0; 202 rc4_off = 0; 203 } 204 #endif 205 /* decrypt HMAC at once */ 206 RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); 207 if (plen!=NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */ 208 MD5_Update(&key->md, out + md5_off, plen - md5_off); 209 210 /* calculate HMAC and verify it */ 211 MD5_Final(mac, &key->md); 212 key->md = key->tail; 213 MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); 214 MD5_Final(mac, &key->md); 215 216 if (memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) 217 return 0; 218 } else { 219 MD5_Update(&key->md, out + md5_off, len - md5_off); 220 } 221 } 222 223 key->payload_length = NO_PAYLOAD_LENGTH; 224 225 return 1; 226 } 227 228 static int 229 rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 230 { 231 EVP_RC4_HMAC_MD5 *key = data(ctx); 232 233 switch (type) { 234 case EVP_CTRL_AEAD_SET_MAC_KEY: 235 { 236 unsigned int i; 237 unsigned char hmac_key[64]; 238 239 memset (hmac_key, 0, sizeof(hmac_key)); 240 241 if (arg > (int)sizeof(hmac_key)) { 242 MD5_Init(&key->head); 243 MD5_Update(&key->head, ptr, arg); 244 MD5_Final(hmac_key, &key->head); 245 } else { 246 memcpy(hmac_key, ptr, arg); 247 } 248 249 for (i = 0; i < sizeof(hmac_key); i++) 250 hmac_key[i] ^= 0x36; /* ipad */ 251 MD5_Init(&key->head); 252 MD5_Update(&key->head, hmac_key, sizeof(hmac_key)); 253 254 for (i = 0; i < sizeof(hmac_key); i++) 255 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */ 256 MD5_Init(&key->tail); 257 MD5_Update(&key->tail, hmac_key, sizeof(hmac_key)); 258 259 return 1; 260 } 261 case EVP_CTRL_AEAD_TLS1_AAD: 262 { 263 unsigned char *p = ptr; 264 unsigned int len = p[arg - 2] << 8 | p[arg - 1]; 265 266 if (!ctx->encrypt) { 267 if (len < MD5_DIGEST_LENGTH) 268 return -1; 269 len -= MD5_DIGEST_LENGTH; 270 p[arg - 2] = len >> 8; 271 p[arg - 1] = len; 272 } 273 key->payload_length = len; 274 key->md = key->head; 275 MD5_Update(&key->md, p, arg); 276 277 return MD5_DIGEST_LENGTH; 278 } 279 default: 280 return -1; 281 } 282 } 283 284 static EVP_CIPHER r4_hmac_md5_cipher = { 285 #ifdef NID_rc4_hmac_md5 286 NID_rc4_hmac_md5, 287 #else 288 NID_undef, 289 #endif 290 1, EVP_RC4_KEY_SIZE, 0, 291 EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER, 292 rc4_hmac_md5_init_key, 293 rc4_hmac_md5_cipher, 294 NULL, 295 sizeof(EVP_RC4_HMAC_MD5), 296 NULL, 297 NULL, 298 rc4_hmac_md5_ctrl, 299 NULL 300 }; 301 302 const EVP_CIPHER * 303 EVP_rc4_hmac_md5(void) 304 { 305 return (&r4_hmac_md5_cipher); 306 } 307 #endif 308