lib/libcrypto/evp/e_rc4_hmac_md5.c

   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