crypto/md5/md5_locl.h

   1 /* crypto/md5/md5_locl.h */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <openssl/md5.h>
  62
  63 #ifndef MD5_LONG_LOG2
  64 #define MD5_LONG_LOG2 2 /* default to 32 bits */
  65 #endif
  66
  67 #ifdef MD5_ASM
  68 # if defined(__i386) || defined(WIN32)
  69 #  define md5_block_host_order md5_block_asm_host_order
  70 # elif defined(__sparc) && defined(ULTRASPARC)
  71    void md5_block_asm_data_order_aligned (MD5_CTX *c, const MD5_LONG *p,int num);
  72 #  define HASH_BLOCK_DATA_ORDER_ALIGNED md5_block_asm_data_order_aligned
  73 # endif
  74 #endif
  75
  76 void md5_block_host_order (MD5_CTX *c, const void *p,int num);
  77 void md5_block_data_order (MD5_CTX *c, const void *p,int num);
  78
  79 #if defined(__i386)
  80 /*
  81  * *_block_host_order is expected to handle aligned data while
  82  * *_block_data_order - unaligned. As algorithm and host (x86)
  83  * are in this case of the same "endianess" these two are
  84  * otherwise indistinguishable. But normally you don't want to
  85  * call the same function because unaligned access in places
  86  * where alignment is expected is usually a "Bad Thing". Indeed,
  87  * on RISCs you get punished with BUS ERROR signal or *severe*
  88  * performance degradation. Intel CPUs are in turn perfectly
  89  * capable of loading unaligned data without such drastic side
  90  * effect. Yes, they say it's slower than aligned load, but no
  91  * exception is generated and therefore performance degradation
  92  * is *incomparable* with RISCs. What we should weight here is
  93  * costs of unaligned access against costs of aligning data.
  94  * According to my measurements allowing unaligned access results
  95  * in ~9% performance improvement on Pentium II operating at
  96  * 266MHz. I won't be surprised if the difference will be higher
  97  * on faster systems:-)
  98  *
  99  *                              <appro@fy.chalmers.se>
 100  */
 101 #define md5_block_data_order md5_block_host_order
 102 #endif
 103
 104 #define DATA_ORDER_IS_LITTLE_ENDIAN
 105
 106 #define HASH_LONG               MD5_LONG
 107 #define HASH_LONG_LOG2          MD5_LONG_LOG2
 108 #define HASH_CTX                MD5_CTX
 109 #define HASH_CBLOCK             MD5_CBLOCK
 110 #define HASH_LBLOCK             MD5_LBLOCK
 111 #define HASH_UPDATE             MD5_Update
 112 #define HASH_TRANSFORM          MD5_Transform
 113 #define HASH_FINAL              MD5_Final
 114 #define HASH_BLOCK_HOST_ORDER   md5_block_host_order
 115 #if !defined(L_ENDIAN) || defined(md5_block_data_order)
 116 #define HASH_BLOCK_DATA_ORDER   md5_block_data_order
 117 /*
 118  * Little-endians (Intel and Alpha) feel better without this.
 119  * It looks like memcpy does better job than generic
 120  * md5_block_data_order on copying-n-aligning input data.
 121  * But franlky speaking I didn't expect such result on Alpha.
 122  * On the other hand I've got this with egcs-1.0.2 and if
 123  * program is compiled with another (better?) compiler it
 124  * might turn out other way around.
 125  *
 126  *                              <appro@fy.chalmers.se>
 127  */
 128 #endif
 129
 130 #include "../md32_common.h"
 131
 132 /*
 133 #define F(x,y,z)        (((x) & (y))  |  ((~(x)) & (z)))
 134 #define G(x,y,z)        (((x) & (z))  |  ((y) & (~(z))))
 135 */
 136
 137 /* As pointed out by Wei Dai <weidai@eskimo.com>, the above can be
 138  * simplified to the code below.  Wei attributes these optimisations
 139  * to Peter Gutmann's SHS code, and he attributes it to Rich Schroeppel.
 140  */
 141 #define F(b,c,d)        ((((c) ^ (d)) & (b)) ^ (d))
 142 #define G(b,c,d)        ((((b) ^ (c)) & (d)) ^ (c))
 143 #define H(b,c,d)        ((b) ^ (c) ^ (d))
 144 #define I(b,c,d)        (((~(d)) | (b)) ^ (c))
 145
 146 #define R0(a,b,c,d,k,s,t) { \
 147         a+=((k)+(t)+F((b),(c),(d))); \
 148         a=ROTATE(a,s); \
 149         a+=b; };\
 150
 151 #define R1(a,b,c,d,k,s,t) { \
 152         a+=((k)+(t)+G((b),(c),(d))); \
 153         a=ROTATE(a,s); \
 154         a+=b; };
 155
 156 #define R2(a,b,c,d,k,s,t) { \
 157         a+=((k)+(t)+H((b),(c),(d))); \
 158         a=ROTATE(a,s); \
 159         a+=b; };
 160
 161 #define R3(a,b,c,d,k,s,t) { \
 162         a+=((k)+(t)+I((b),(c),(d))); \
 163         a=ROTATE(a,s); \
 164         a+=b; };