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/evp.h>
  58 #include <openssl/objects.h>
  59 #include <openssl/rc4.h>
  60 #include <openssl/md5.h>
  61
  62 #ifndef EVP_CIPH_FLAG_AEAD_CIPHER
  63 #define EVP_CIPH_FLAG_AEAD_CIPHER       0x200000
  64 #define EVP_CTRL_AEAD_TLS1_AAD          0x16
  65 #define EVP_CTRL_AEAD_SET_MAC_KEY       0x17
  66 #endif
  67
  68 /* FIXME: surely this is available elsewhere? */
  69 #define EVP_RC4_KEY_SIZE                16
  70
  71 typedef struct
  72     {
  73     RC4_KEY             ks;
  74     MD5_CTX             head,tail,md;
  75     size_t              payload_length;
  76     } EVP_RC4_HMAC_MD5;
  77
  78 void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out,
  79                 MD5_CTX *ctx,const void *inp,size_t blocks);
  80
  81 #define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data)
  82
  83 static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
  84                         const unsigned char *inkey,
  85                         const unsigned char *iv, int enc)
  86         {
  87         EVP_RC4_HMAC_MD5 *key = data(ctx);
  88
  89         RC4_set_key(&key->ks,EVP_CIPHER_CTX_key_length(ctx),
  90                     inkey);
  91
  92         MD5_Init(&key->head);   /* handy when benchmarking */
  93         key->tail = key->head;
  94         key->md   = key->head;
  95
  96         key->payload_length = 0;
  97
  98         return 1;
  99         }
 100
 101 #if     !defined(OPENSSL_NO_ASM) &&     ( \
 102         defined(__x86_64)       || defined(__x86_64__)  || \
 103         defined(_M_AMD64)       || defined(_M_X64)      || \
 104         defined(__INTEL__)              )
 105 #define STITCHED_CALL
 106 #endif
 107
 108 #if !defined(STITCHED_CALL)
 109 #define rc4_off 0
 110 #define md5_off 0
 111 #endif
 112
 113 static int 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 && len!=(plen+MD5_DIGEST_LENGTH)) return 0;
 126
 127         if (ctx->encrypt) {
 128                 if (plen==0) plen = len;
 129 #if defined(STITCHED_CALL)
 130                 /* cipher has to "fall behind" */
 131                 if (rc4_off>md5_off) md5_off+=MD5_CBLOCK;
 132
 133                 if (plen>md5_off && (blocks=(plen-md5_off)/MD5_CBLOCK)) {
 134                         MD5_Update(&key->md,in,md5_off);
 135                         RC4(&key->ks,rc4_off,in,out);
 136
 137                         rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off,
 138                                 &key->md,in+md5_off,blocks);
 139                         blocks *= MD5_CBLOCK;
 140                         rc4_off += blocks;
 141                         md5_off += blocks;
 142                         key->md.Nh += blocks>>29;
 143                         key->md.Nl += blocks<<=3;
 144                         if (key->md.Nl<(unsigned int)blocks) key->md.Nh++;
 145                 } else {
 146                         rc4_off = 0;
 147                         md5_off = 0;
 148                 }
 149 #endif
 150                 MD5_Update(&key->md,in+md5_off,plen-md5_off);
 151
 152                 if (plen!=len) {        /* "TLS" mode of operation */
 153                         if (in!=out)
 154                                 memcpy(out+rc4_off,in+rc4_off,plen-rc4_off);
 155
 156                         /* calculate HMAC and append it to payload */
 157                         MD5_Final(out+plen,&key->md);
 158                         key->md = key->tail;
 159                         MD5_Update(&key->md,out+plen,MD5_DIGEST_LENGTH);
 160                         MD5_Final(out+plen,&key->md);
 161                         /* encrypt HMAC at once */
 162                         RC4(&key->ks,len-rc4_off,out+rc4_off,out+rc4_off);
 163                 } else {
 164                         RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
 165                 }
 166         } else {
 167                 unsigned char mac[MD5_DIGEST_LENGTH];
 168 #if defined(STITCHED_CALL)
 169                 /* digest has to "fall behind" */
 170                 if (md5_off>rc4_off)    rc4_off += 2*MD5_CBLOCK;
 171                 else                    rc4_off += MD5_CBLOCK;
 172
 173                 if (len>rc4_off && (blocks=(len-rc4_off)/MD5_CBLOCK)) {
 174                         RC4(&key->ks,rc4_off,in,out);
 175                         MD5_Update(&key->md,out,md5_off);
 176
 177                         rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off,
 178                                 &key->md,out+md5_off,blocks);
 179                         blocks *= MD5_CBLOCK;
 180                         rc4_off += blocks;
 181                         md5_off += blocks;
 182                         l = (key->md.Nl+(blocks<<3))&0xffffffffU;
 183                         if (l<key->md.Nl) key->md.Nh++;
 184                         key->md.Nl  = l;
 185                         key->md.Nh += blocks>>29;
 186                 } else {
 187                         md5_off=0;
 188                         rc4_off=0;
 189                 }
 190 #endif
 191                 /* decrypt HMAC at once */
 192                 RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
 193                 if (plen) {     /* "TLS" mode of operation */
 194                         MD5_Update(&key->md,out+md5_off,plen-md5_off);
 195
 196                         /* calculate HMAC and verify it */
 197                         MD5_Final(mac,&key->md);
 198                         key->md = key->tail;
 199                         MD5_Update(&key->md,mac,MD5_DIGEST_LENGTH);
 200                         MD5_Final(mac,&key->md);
 201
 202                         if (memcmp(out+plen,mac,MD5_DIGEST_LENGTH))
 203                                 return 0;
 204                 } else {
 205                         MD5_Update(&key->md,out+md5_off,len-md5_off);
 206                 }
 207         }
 208
 209         key->payload_length = 0;
 210
 211         return 1;
 212         }
 213
 214 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 215         {
 216         EVP_RC4_HMAC_MD5 *key = data(ctx);
 217
 218         switch (type)
 219                 {
 220         case EVP_CTRL_AEAD_SET_MAC_KEY:
 221                 {
 222                 unsigned int  i;
 223                 unsigned char hmac_key[64];
 224
 225                 memset (hmac_key,0,sizeof(hmac_key));
 226
 227                 if (arg > sizeof(hmac_key)) {
 228                         MD5_Init(&key->head);
 229                         MD5_Update(&key->head,ptr,arg);
 230                         MD5_Final(hmac_key,&key->head);
 231                 } else {
 232                         memcpy(hmac_key,ptr,arg);
 233                 }
 234
 235                 for (i=0;i<sizeof(hmac_key);i++)
 236                         hmac_key[i] ^= 0x36;            /* ipad */
 237                 MD5_Init(&key->head);
 238                 MD5_Update(&key->head,hmac_key,sizeof(hmac_key));
 239
 240                 for (i=0;i<sizeof(hmac_key);i++)
 241                         hmac_key[i] ^= 0x36^0x5c;       /* opad */
 242                 MD5_Init(&key->tail);
 243                 MD5_Update(&key->tail,hmac_key,sizeof(hmac_key));
 244
 245                 return 1;
 246                 }
 247         case EVP_CTRL_AEAD_TLS1_AAD:
 248                 {
 249                 unsigned char *p=ptr;
 250                 unsigned int   len=p[arg-2]<<8|p[arg-1];
 251
 252                 if (!ctx->encrypt)
 253                         {
 254                         len -= MD5_DIGEST_LENGTH;
 255                         p[arg-2] = len>>8;
 256                         p[arg-1] = len;
 257                         }
 258                 key->payload_length=len;
 259                 key->md = key->head;
 260                 MD5_Update(&key->md,p,arg);
 261
 262                 return MD5_DIGEST_LENGTH;
 263                 }
 264         default:
 265                 return -1;
 266                 }
 267         }
 268
 269 static EVP_CIPHER r4_hmac_md5_cipher=
 270         {
 271 #ifdef NID_rc4_hmac_md5
 272         NID_rc4_hmac_md5,
 273 #else
 274         NID_undef,
 275 #endif
 276         1,EVP_RC4_KEY_SIZE,0,
 277         EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER,
 278         rc4_hmac_md5_init_key,
 279         rc4_hmac_md5_cipher,
 280         NULL,
 281         sizeof(EVP_RC4_HMAC_MD5),
 282         NULL,
 283         NULL,
 284         rc4_hmac_md5_ctrl,
 285         NULL
 286         };
 287
 288 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
 289         {
 290         return(&r4_hmac_md5_cipher);
 291         }
 292 #endif