1238384Sjkim/* ==================================================================== 2238384Sjkim * Copyright (c) 2011 The OpenSSL Project. All rights reserved. 3238384Sjkim * 4238384Sjkim * Redistribution and use in source and binary forms, with or without 5238384Sjkim * modification, are permitted provided that the following conditions 6238384Sjkim * are met: 7238384Sjkim * 8238384Sjkim * 1. Redistributions of source code must retain the above copyright 9238384Sjkim * notice, this list of conditions and the following disclaimer. 10238384Sjkim * 11238384Sjkim * 2. Redistributions in binary form must reproduce the above copyright 12238384Sjkim * notice, this list of conditions and the following disclaimer in 13238384Sjkim * the documentation and/or other materials provided with the 14238384Sjkim * distribution. 15238384Sjkim * 16238384Sjkim * 3. All advertising materials mentioning features or use of this 17238384Sjkim * software must display the following acknowledgment: 18238384Sjkim * "This product includes software developed by the OpenSSL Project 19238384Sjkim * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 20238384Sjkim * 21238384Sjkim * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 22238384Sjkim * endorse or promote products derived from this software without 23238384Sjkim * prior written permission. For written permission, please contact 24238384Sjkim * licensing@OpenSSL.org. 25238384Sjkim * 26238384Sjkim * 5. Products derived from this software may not be called "OpenSSL" 27238384Sjkim * nor may "OpenSSL" appear in their names without prior written 28238384Sjkim * permission of the OpenSSL Project. 29238384Sjkim * 30238384Sjkim * 6. Redistributions of any form whatsoever must retain the following 31238384Sjkim * acknowledgment: 32238384Sjkim * "This product includes software developed by the OpenSSL Project 33238384Sjkim * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 34238384Sjkim * 35238384Sjkim * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 36238384Sjkim * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 37238384Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 38238384Sjkim * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 39238384Sjkim * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40238384Sjkim * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 41238384Sjkim * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 42238384Sjkim * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43238384Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 44238384Sjkim * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 45238384Sjkim * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 46238384Sjkim * OF THE POSSIBILITY OF SUCH DAMAGE. 47238384Sjkim * ==================================================================== 48238384Sjkim */ 49238384Sjkim 50238384Sjkim#include <openssl/opensslconf.h> 51238384Sjkim 52238384Sjkim#include <stdio.h> 53238384Sjkim#include <string.h> 54238384Sjkim 55238384Sjkim#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5) 56238384Sjkim 57284283Sjkim# include <openssl/crypto.h> 58280297Sjkim# include <openssl/evp.h> 59280297Sjkim# include <openssl/objects.h> 60280297Sjkim# include <openssl/rc4.h> 61280297Sjkim# include <openssl/md5.h> 62238384Sjkim 63280297Sjkim# ifndef EVP_CIPH_FLAG_AEAD_CIPHER 64280297Sjkim# define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000 65280297Sjkim# define EVP_CTRL_AEAD_TLS1_AAD 0x16 66280297Sjkim# define EVP_CTRL_AEAD_SET_MAC_KEY 0x17 67280297Sjkim# endif 68238384Sjkim 69238384Sjkim/* FIXME: surely this is available elsewhere? */ 70280297Sjkim# define EVP_RC4_KEY_SIZE 16 71238384Sjkim 72280297Sjkimtypedef struct { 73280297Sjkim RC4_KEY ks; 74280297Sjkim MD5_CTX head, tail, md; 75280297Sjkim size_t payload_length; 76280297Sjkim} EVP_RC4_HMAC_MD5; 77238384Sjkim 78280297Sjkim# define NO_PAYLOAD_LENGTH ((size_t)-1) 79238384Sjkim 80280297Sjkimvoid rc4_md5_enc(RC4_KEY *key, const void *in0, void *out, 81280297Sjkim MD5_CTX *ctx, const void *inp, size_t blocks); 82238384Sjkim 83280297Sjkim# define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data) 84238384Sjkim 85238384Sjkimstatic int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, 86280297Sjkim const unsigned char *inkey, 87280297Sjkim const unsigned char *iv, int enc) 88280297Sjkim{ 89280297Sjkim EVP_RC4_HMAC_MD5 *key = data(ctx); 90238384Sjkim 91280297Sjkim RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); 92238384Sjkim 93280297Sjkim MD5_Init(&key->head); /* handy when benchmarking */ 94280297Sjkim key->tail = key->head; 95280297Sjkim key->md = key->head; 96238384Sjkim 97280297Sjkim key->payload_length = NO_PAYLOAD_LENGTH; 98238384Sjkim 99280297Sjkim return 1; 100280297Sjkim} 101238384Sjkim 102306195Sjkim# if defined(RC4_ASM) && defined(MD5_ASM) && ( \ 103280297Sjkim defined(__x86_64) || defined(__x86_64__) || \ 104280297Sjkim defined(_M_AMD64) || defined(_M_X64) || \ 105280297Sjkim defined(__INTEL__) ) && \ 106280297Sjkim !(defined(__APPLE__) && defined(__MACH__)) 107280297Sjkim# define STITCHED_CALL 108280297Sjkim# endif 109238384Sjkim 110280297Sjkim# if !defined(STITCHED_CALL) 111280297Sjkim# define rc4_off 0 112280297Sjkim# define md5_off 0 113280297Sjkim# endif 114238384Sjkim 115238384Sjkimstatic int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 116280297Sjkim const unsigned char *in, size_t len) 117280297Sjkim{ 118280297Sjkim EVP_RC4_HMAC_MD5 *key = data(ctx); 119280297Sjkim# if defined(STITCHED_CALL) 120280297Sjkim size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from 121280297Sjkim * rc4_md5-x86_64.pl */ 122280297Sjkim md5_off = MD5_CBLOCK - key->md.num, blocks; 123280297Sjkim unsigned int l; 124280297Sjkim extern unsigned int OPENSSL_ia32cap_P[]; 125280297Sjkim# endif 126280297Sjkim size_t plen = key->payload_length; 127238384Sjkim 128280297Sjkim if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) 129280297Sjkim return 0; 130238384Sjkim 131280297Sjkim if (ctx->encrypt) { 132280297Sjkim if (plen == NO_PAYLOAD_LENGTH) 133280297Sjkim plen = len; 134280297Sjkim# if defined(STITCHED_CALL) 135280297Sjkim /* cipher has to "fall behind" */ 136280297Sjkim if (rc4_off > md5_off) 137280297Sjkim md5_off += MD5_CBLOCK; 138238384Sjkim 139280297Sjkim if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) && 140280297Sjkim (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { 141280297Sjkim MD5_Update(&key->md, in, md5_off); 142280297Sjkim RC4(&key->ks, rc4_off, in, out); 143238384Sjkim 144280297Sjkim rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 145280297Sjkim &key->md, in + md5_off, blocks); 146280297Sjkim blocks *= MD5_CBLOCK; 147280297Sjkim rc4_off += blocks; 148280297Sjkim md5_off += blocks; 149280297Sjkim key->md.Nh += blocks >> 29; 150280297Sjkim key->md.Nl += blocks <<= 3; 151280297Sjkim if (key->md.Nl < (unsigned int)blocks) 152280297Sjkim key->md.Nh++; 153280297Sjkim } else { 154280297Sjkim rc4_off = 0; 155280297Sjkim md5_off = 0; 156280297Sjkim } 157280297Sjkim# endif 158280297Sjkim MD5_Update(&key->md, in + md5_off, plen - md5_off); 159238384Sjkim 160280297Sjkim if (plen != len) { /* "TLS" mode of operation */ 161280297Sjkim if (in != out) 162280297Sjkim memcpy(out + rc4_off, in + rc4_off, plen - rc4_off); 163238384Sjkim 164280297Sjkim /* calculate HMAC and append it to payload */ 165280297Sjkim MD5_Final(out + plen, &key->md); 166280297Sjkim key->md = key->tail; 167280297Sjkim MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH); 168280297Sjkim MD5_Final(out + plen, &key->md); 169280297Sjkim /* encrypt HMAC at once */ 170280297Sjkim RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off); 171280297Sjkim } else { 172280297Sjkim RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); 173280297Sjkim } 174280297Sjkim } else { 175280297Sjkim unsigned char mac[MD5_DIGEST_LENGTH]; 176280297Sjkim# if defined(STITCHED_CALL) 177280297Sjkim /* digest has to "fall behind" */ 178280297Sjkim if (md5_off > rc4_off) 179280297Sjkim rc4_off += 2 * MD5_CBLOCK; 180280297Sjkim else 181280297Sjkim rc4_off += MD5_CBLOCK; 182238384Sjkim 183280297Sjkim if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) && 184280297Sjkim (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { 185280297Sjkim RC4(&key->ks, rc4_off, in, out); 186280297Sjkim MD5_Update(&key->md, out, md5_off); 187238384Sjkim 188280297Sjkim rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, 189280297Sjkim &key->md, out + md5_off, blocks); 190280297Sjkim blocks *= MD5_CBLOCK; 191280297Sjkim rc4_off += blocks; 192280297Sjkim md5_off += blocks; 193280297Sjkim l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; 194280297Sjkim if (l < key->md.Nl) 195280297Sjkim key->md.Nh++; 196280297Sjkim key->md.Nl = l; 197280297Sjkim key->md.Nh += blocks >> 29; 198280297Sjkim } else { 199280297Sjkim md5_off = 0; 200280297Sjkim rc4_off = 0; 201280297Sjkim } 202280297Sjkim# endif 203280297Sjkim /* decrypt HMAC at once */ 204280297Sjkim RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); 205280297Sjkim if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */ 206280297Sjkim MD5_Update(&key->md, out + md5_off, plen - md5_off); 207238384Sjkim 208280297Sjkim /* calculate HMAC and verify it */ 209280297Sjkim MD5_Final(mac, &key->md); 210280297Sjkim key->md = key->tail; 211280297Sjkim MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); 212280297Sjkim MD5_Final(mac, &key->md); 213238384Sjkim 214284283Sjkim if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) 215280297Sjkim return 0; 216280297Sjkim } else { 217280297Sjkim MD5_Update(&key->md, out + md5_off, len - md5_off); 218280297Sjkim } 219280297Sjkim } 220238384Sjkim 221280297Sjkim key->payload_length = NO_PAYLOAD_LENGTH; 222238384Sjkim 223280297Sjkim return 1; 224280297Sjkim} 225238384Sjkim 226280297Sjkimstatic int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 227280297Sjkim void *ptr) 228280297Sjkim{ 229280297Sjkim EVP_RC4_HMAC_MD5 *key = data(ctx); 230238384Sjkim 231280297Sjkim switch (type) { 232280297Sjkim case EVP_CTRL_AEAD_SET_MAC_KEY: 233280297Sjkim { 234280297Sjkim unsigned int i; 235280297Sjkim unsigned char hmac_key[64]; 236238384Sjkim 237280297Sjkim memset(hmac_key, 0, sizeof(hmac_key)); 238238384Sjkim 239280297Sjkim if (arg > (int)sizeof(hmac_key)) { 240280297Sjkim MD5_Init(&key->head); 241280297Sjkim MD5_Update(&key->head, ptr, arg); 242280297Sjkim MD5_Final(hmac_key, &key->head); 243280297Sjkim } else { 244280297Sjkim memcpy(hmac_key, ptr, arg); 245280297Sjkim } 246238384Sjkim 247280297Sjkim for (i = 0; i < sizeof(hmac_key); i++) 248280297Sjkim hmac_key[i] ^= 0x36; /* ipad */ 249280297Sjkim MD5_Init(&key->head); 250280297Sjkim MD5_Update(&key->head, hmac_key, sizeof(hmac_key)); 251238384Sjkim 252280297Sjkim for (i = 0; i < sizeof(hmac_key); i++) 253280297Sjkim hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */ 254280297Sjkim MD5_Init(&key->tail); 255280297Sjkim MD5_Update(&key->tail, hmac_key, sizeof(hmac_key)); 256238384Sjkim 257306195Sjkim OPENSSL_cleanse(hmac_key, sizeof(hmac_key)); 258306195Sjkim 259280297Sjkim return 1; 260280297Sjkim } 261280297Sjkim case EVP_CTRL_AEAD_TLS1_AAD: 262280297Sjkim { 263280297Sjkim unsigned char *p = ptr; 264284283Sjkim unsigned int len; 265238384Sjkim 266284283Sjkim if (arg != EVP_AEAD_TLS1_AAD_LEN) 267284283Sjkim return -1; 268284283Sjkim 269284283Sjkim len = p[arg - 2] << 8 | p[arg - 1]; 270284283Sjkim 271280297Sjkim if (!ctx->encrypt) { 272312826Sjkim if (len < MD5_DIGEST_LENGTH) 273312826Sjkim return -1; 274280297Sjkim len -= MD5_DIGEST_LENGTH; 275280297Sjkim p[arg - 2] = len >> 8; 276280297Sjkim p[arg - 1] = len; 277280297Sjkim } 278280297Sjkim key->payload_length = len; 279280297Sjkim key->md = key->head; 280280297Sjkim MD5_Update(&key->md, p, arg); 281238384Sjkim 282280297Sjkim return MD5_DIGEST_LENGTH; 283280297Sjkim } 284280297Sjkim default: 285280297Sjkim return -1; 286280297Sjkim } 287280297Sjkim} 288238384Sjkim 289280297Sjkimstatic EVP_CIPHER r4_hmac_md5_cipher = { 290280297Sjkim# ifdef NID_rc4_hmac_md5 291280297Sjkim NID_rc4_hmac_md5, 292280297Sjkim# else 293280297Sjkim NID_undef, 294280297Sjkim# endif 295280297Sjkim 1, EVP_RC4_KEY_SIZE, 0, 296280297Sjkim EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH | 297280297Sjkim EVP_CIPH_FLAG_AEAD_CIPHER, 298280297Sjkim rc4_hmac_md5_init_key, 299280297Sjkim rc4_hmac_md5_cipher, 300280297Sjkim NULL, 301280297Sjkim sizeof(EVP_RC4_HMAC_MD5), 302280297Sjkim NULL, 303280297Sjkim NULL, 304280297Sjkim rc4_hmac_md5_ctrl, 305280297Sjkim NULL 306280297Sjkim}; 307238384Sjkim 308238384Sjkimconst EVP_CIPHER *EVP_rc4_hmac_md5(void) 309280297Sjkim{ 310280297Sjkim return (&r4_hmac_md5_cipher); 311280297Sjkim} 312238384Sjkim#endif 313