| 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 | !(defined(__APPLE__) && defined(__MACH__)) |
| 106 | #define STITCHED_CALL |
| 107 | #endif |
| 108 | |
| 109 | #if !defined(STITCHED_CALL) |
| 110 | #define rc4_off 0 |
| 111 | #define md5_off 0 |
| 112 | #endif |
| 113 | |
| 114 | static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 115 | const unsigned char *in, size_t len) |
| 116 | { |
| 117 | EVP_RC4_HMAC_MD5 *key = data(ctx); |
| 118 | #if defined(STITCHED_CALL) |
| 119 | size_t rc4_off = 32-1-(key->ks.x&(32-1)), /* 32 is $MOD from rc4_md5-x86_64.pl */ |
| 120 | md5_off = MD5_CBLOCK-key->md.num, |
| 121 | blocks; |
| 122 | unsigned int l; |
| 123 | #endif |
| 124 | size_t plen = key->payload_length; |
| 125 | |
| 126 | if (plen && len!=(plen+MD5_DIGEST_LENGTH)) return 0; |
| 127 | |
| 128 | if (ctx->encrypt) { |
| 129 | if (plen==0) plen = len; |
| 130 | #if defined(STITCHED_CALL) |
| 131 | /* cipher has to "fall behind" */ |
| 132 | if (rc4_off>md5_off) md5_off+=MD5_CBLOCK; |
| 133 | |
| 134 | if (plen>md5_off && (blocks=(plen-md5_off)/MD5_CBLOCK)) { |
| 135 | MD5_Update(&key->md,in,md5_off); |
| 136 | RC4(&key->ks,rc4_off,in,out); |
| 137 | |
| 138 | rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off, |
| 139 | &key->md,in+md5_off,blocks); |
| 140 | blocks *= MD5_CBLOCK; |
| 141 | rc4_off += blocks; |
| 142 | md5_off += blocks; |
| 143 | key->md.Nh += blocks>>29; |
| 144 | key->md.Nl += blocks<<=3; |
| 145 | if (key->md.Nl<(unsigned int)blocks) key->md.Nh++; |
| 146 | } else { |
| 147 | rc4_off = 0; |
| 148 | md5_off = 0; |
| 149 | } |
| 150 | #endif |
| 151 | MD5_Update(&key->md,in+md5_off,plen-md5_off); |
| 152 | |
| 153 | if (plen!=len) { /* "TLS" mode of operation */ |
| 154 | if (in!=out) |
| 155 | memcpy(out+rc4_off,in+rc4_off,plen-rc4_off); |
| 156 | |
| 157 | /* calculate HMAC and append it to payload */ |
| 158 | MD5_Final(out+plen,&key->md); |
| 159 | key->md = key->tail; |
| 160 | MD5_Update(&key->md,out+plen,MD5_DIGEST_LENGTH); |
| 161 | MD5_Final(out+plen,&key->md); |
| 162 | /* encrypt HMAC at once */ |
| 163 | RC4(&key->ks,len-rc4_off,out+rc4_off,out+rc4_off); |
| 164 | } else { |
| 165 | RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off); |
| 166 | } |
| 167 | } else { |
| 168 | unsigned char mac[MD5_DIGEST_LENGTH]; |
| 169 | #if defined(STITCHED_CALL) |
| 170 | /* digest has to "fall behind" */ |
| 171 | if (md5_off>rc4_off) rc4_off += 2*MD5_CBLOCK; |
| 172 | else rc4_off += MD5_CBLOCK; |
| 173 | |
| 174 | if (len>rc4_off && (blocks=(len-rc4_off)/MD5_CBLOCK)) { |
| 175 | RC4(&key->ks,rc4_off,in,out); |
| 176 | MD5_Update(&key->md,out,md5_off); |
| 177 | |
| 178 | rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off, |
| 179 | &key->md,out+md5_off,blocks); |
| 180 | blocks *= MD5_CBLOCK; |
| 181 | rc4_off += blocks; |
| 182 | md5_off += blocks; |
| 183 | l = (key->md.Nl+(blocks<<3))&0xffffffffU; |
| 184 | if (l<key->md.Nl) key->md.Nh++; |
| 185 | key->md.Nl = l; |
| 186 | key->md.Nh += blocks>>29; |
| 187 | } else { |
| 188 | md5_off=0; |
| 189 | rc4_off=0; |
| 190 | } |
| 191 | #endif |
| 192 | /* decrypt HMAC at once */ |
| 193 | RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off); |
| 194 | if (plen) { /* "TLS" mode of operation */ |
| 195 | MD5_Update(&key->md,out+md5_off,plen-md5_off); |
| 196 | |
| 197 | /* calculate HMAC and verify it */ |
| 198 | MD5_Final(mac,&key->md); |
| 199 | key->md = key->tail; |
| 200 | MD5_Update(&key->md,mac,MD5_DIGEST_LENGTH); |
| 201 | MD5_Final(mac,&key->md); |
| 202 | |
| 203 | if (memcmp(out+plen,mac,MD5_DIGEST_LENGTH)) |
| 204 | return 0; |
| 205 | } else { |
| 206 | MD5_Update(&key->md,out+md5_off,len-md5_off); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | key->payload_length = 0; |
| 211 | |
| 212 | return 1; |
| 213 | } |
| 214 | |
| 215 | static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) |
| 216 | { |
| 217 | EVP_RC4_HMAC_MD5 *key = data(ctx); |
| 218 | |
| 219 | switch (type) |
| 220 | { |
| 221 | case EVP_CTRL_AEAD_SET_MAC_KEY: |
| 222 | { |
| 223 | unsigned int i; |
| 224 | unsigned char hmac_key[64]; |
| 225 | |
| 226 | memset (hmac_key,0,sizeof(hmac_key)); |
| 227 | |
| 228 | if (arg > (int)sizeof(hmac_key)) { |
| 229 | MD5_Init(&key->head); |
| 230 | MD5_Update(&key->head,ptr,arg); |
| 231 | MD5_Final(hmac_key,&key->head); |
| 232 | } else { |
| 233 | memcpy(hmac_key,ptr,arg); |
| 234 | } |
| 235 | |
| 236 | for (i=0;i<sizeof(hmac_key);i++) |
| 237 | hmac_key[i] ^= 0x36; /* ipad */ |
| 238 | MD5_Init(&key->head); |
| 239 | MD5_Update(&key->head,hmac_key,sizeof(hmac_key)); |
| 240 | |
| 241 | for (i=0;i<sizeof(hmac_key);i++) |
| 242 | hmac_key[i] ^= 0x36^0x5c; /* opad */ |
| 243 | MD5_Init(&key->tail); |
| 244 | MD5_Update(&key->tail,hmac_key,sizeof(hmac_key)); |
| 245 | |
| 246 | return 1; |
| 247 | } |
| 248 | case EVP_CTRL_AEAD_TLS1_AAD: |
| 249 | { |
| 250 | unsigned char *p=ptr; |
| 251 | unsigned int len=p[arg-2]<<8|p[arg-1]; |
| 252 | |
| 253 | if (!ctx->encrypt) |
| 254 | { |
| 255 | len -= MD5_DIGEST_LENGTH; |
| 256 | p[arg-2] = len>>8; |
| 257 | p[arg-1] = len; |
| 258 | } |
| 259 | key->payload_length=len; |
| 260 | key->md = key->head; |
| 261 | MD5_Update(&key->md,p,arg); |
| 262 | |
| 263 | return MD5_DIGEST_LENGTH; |
| 264 | } |
| 265 | default: |
| 266 | return -1; |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | static EVP_CIPHER r4_hmac_md5_cipher= |
| 271 | { |
| 272 | #ifdef NID_rc4_hmac_md5 |
| 273 | NID_rc4_hmac_md5, |
| 274 | #else |
| 275 | NID_undef, |
| 276 | #endif |
| 277 | 1,EVP_RC4_KEY_SIZE,0, |
| 278 | EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER, |
| 279 | rc4_hmac_md5_init_key, |
| 280 | rc4_hmac_md5_cipher, |
| 281 | NULL, |
| 282 | sizeof(EVP_RC4_HMAC_MD5), |
| 283 | NULL, |
| 284 | NULL, |
| 285 | rc4_hmac_md5_ctrl, |
| 286 | NULL |
| 287 | }; |
| 288 | |
| 289 | const EVP_CIPHER *EVP_rc4_hmac_md5(void) |
| 290 | { |
| 291 | return(&r4_hmac_md5_cipher); |
| 292 | } |
| 293 | #endif |