Cryptlib/OpenSSL/crypto/evp/e_rc4_hmac_md5.c

   1 /* ====================================================================
   2  * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    licensing@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  */
  49
  50 #include <openssl/opensslconf.h>
  51
  52 #include <stdio.h>
  53 #include <string.h>
  54
  55 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
  56
  57 # include <openssl/crypto.h>
  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 rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
  86                                  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(RC4_ASM) && defined(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 rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 116                                const unsigned char *in, size_t len)
 117 {
 118     EVP_RC4_HMAC_MD5 *key = data(ctx);
 119 # if defined(STITCHED_CALL)
 120     size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
 121                                                        * rc4_md5-x86_64.pl */
 122         md5_off = MD5_CBLOCK - key->md.num, blocks;
 123     unsigned int l;
 124     extern unsigned int OPENSSL_ia32cap_P[];
 125 # endif
 126     size_t plen = key->payload_length;
 127
 128     if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
 129         return 0;
 130
 131     if (ctx->encrypt) {
 132         if (plen == NO_PAYLOAD_LENGTH)
 133             plen = len;
 134 # if defined(STITCHED_CALL)
 135         /* cipher has to "fall behind" */
 136         if (rc4_off > md5_off)
 137             md5_off += MD5_CBLOCK;
 138
 139         if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
 140             (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
 141             MD5_Update(&key->md, in, md5_off);
 142             RC4(&key->ks, rc4_off, in, out);
 143
 144             rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
 145                         &key->md, in + md5_off, blocks);
 146             blocks *= MD5_CBLOCK;
 147             rc4_off += blocks;
 148             md5_off += blocks;
 149             key->md.Nh += blocks >> 29;
 150             key->md.Nl += blocks <<= 3;
 151             if (key->md.Nl < (unsigned int)blocks)
 152                 key->md.Nh++;
 153         } else {
 154             rc4_off = 0;
 155             md5_off = 0;
 156         }
 157 # endif
 158         MD5_Update(&key->md, in + md5_off, plen - md5_off);
 159
 160         if (plen != len) {      /* "TLS" mode of operation */
 161             if (in != out)
 162                 memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
 163
 164             /* calculate HMAC and append it to payload */
 165             MD5_Final(out + plen, &key->md);
 166             key->md = key->tail;
 167             MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
 168             MD5_Final(out + plen, &key->md);
 169             /* encrypt HMAC at once */
 170             RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
 171         } else {
 172             RC4(&key->ks, len - rc4_off, in + rc4_off, 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_ia32cap_P[0] & (1 << 20)) == 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 (CRYPTO_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 rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 227                              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             OPENSSL_cleanse(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;
 265
 266             if (arg != EVP_AEAD_TLS1_AAD_LEN)
 267                 return -1;
 268
 269             len = p[arg - 2] << 8 | p[arg - 1];
 270
 271             if (!ctx->encrypt) {
 272                 if (len < MD5_DIGEST_LENGTH)
 273                     return -1;
 274                 len -= MD5_DIGEST_LENGTH;
 275                 p[arg - 2] = len >> 8;
 276                 p[arg - 1] = len;
 277             }
 278             key->payload_length = len;
 279             key->md = key->head;
 280             MD5_Update(&key->md, p, arg);
 281
 282             return MD5_DIGEST_LENGTH;
 283         }
 284     default:
 285         return -1;
 286     }
 287 }
 288
 289 static EVP_CIPHER r4_hmac_md5_cipher = {
 290 # ifdef NID_rc4_hmac_md5
 291     NID_rc4_hmac_md5,
 292 # else
 293     NID_undef,
 294 # endif
 295     1, EVP_RC4_KEY_SIZE, 0,
 296     EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
 297         EVP_CIPH_FLAG_AEAD_CIPHER,
 298     rc4_hmac_md5_init_key,
 299     rc4_hmac_md5_cipher,
 300     NULL,
 301     sizeof(EVP_RC4_HMAC_MD5),
 302     NULL,
 303     NULL,
 304     rc4_hmac_md5_ctrl,
 305     NULL
 306 };
 307
 308 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
 309 {
 310     return (&r4_hmac_md5_cipher);
 311 }
 312 #endif