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 /* On sparc, this actually slows things down :-( */
  60 #if defined(sun)
  61 #undef B_ENDIAN
  62 #endif
  63
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include "md5.h"
  67
  68 #define ULONG   unsigned long
  69 #define UCHAR   unsigned char
  70 #define UINT    unsigned int
  71
  72 #if defined(NOCONST)
  73 #define const
  74 #endif
  75
  76 #undef c2l
  77 #define c2l(c,l)        (l = ((unsigned long)(*((c)++)))     , \
  78                          l|=(((unsigned long)(*((c)++)))<< 8), \
  79                          l|=(((unsigned long)(*((c)++)))<<16), \
  80                          l|=(((unsigned long)(*((c)++)))<<24))
  81
  82 #undef p_c2l
  83 #define p_c2l(c,l,n)    { \
  84                         switch (n) { \
  85                         case 0: l =((unsigned long)(*((c)++))); \
  86                         case 1: l|=((unsigned long)(*((c)++)))<< 8; \
  87                         case 2: l|=((unsigned long)(*((c)++)))<<16; \
  88                         case 3: l|=((unsigned long)(*((c)++)))<<24; \
  89                                 } \
  90                         }
  91
  92 /* NOTE the pointer is not incremented at the end of this */
  93 #undef c2l_p
  94 #define c2l_p(c,l,n)    { \
  95                         l=0; \
  96                         (c)+=n; \
  97                         switch (n) { \
  98                         case 3: l =((unsigned long)(*(--(c))))<<16; \
  99                         case 2: l|=((unsigned long)(*(--(c))))<< 8; \
 100                         case 1: l|=((unsigned long)(*(--(c))))    ; \
 101                                 } \
 102                         }
 103
 104 #undef p_c2l_p
 105 #define p_c2l_p(c,l,sc,len) { \
 106                         switch (sc) \
 107                                 { \
 108                         case 0: l =((unsigned long)(*((c)++))); \
 109                                 if (--len == 0) break; \
 110                         case 1: l|=((unsigned long)(*((c)++)))<< 8; \
 111                                 if (--len == 0) break; \
 112                         case 2: l|=((unsigned long)(*((c)++)))<<16; \
 113                                 } \
 114                         }
 115
 116 #undef l2c
 117 #define l2c(l,c)        (*((c)++)=(unsigned char)(((l)    )&0xff), \
 118                          *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
 119                          *((c)++)=(unsigned char)(((l)>>16)&0xff), \
 120                          *((c)++)=(unsigned char)(((l)>>24)&0xff))
 121
 122 /* NOTE - c is not incremented as per l2c */
 123 #undef l2cn
 124 #define l2cn(l1,l2,c,n) { \
 125                         c+=n; \
 126                         switch (n) { \
 127                         case 8: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
 128                         case 7: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
 129                         case 6: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
 130                         case 5: *(--(c))=(unsigned char)(((l2)    )&0xff); \
 131                         case 4: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
 132                         case 3: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
 133                         case 2: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
 134                         case 1: *(--(c))=(unsigned char)(((l1)    )&0xff); \
 135                                 } \
 136                         }
 137
 138 /* A nice byte order reversal from Wei Dai <weidai@eskimo.com> */
 139 #if defined(WIN32)
 140 /* 5 instructions with rotate instruction, else 9 */
 141 #define Endian_Reverse32(a) \
 142         { \
 143         unsigned long l=(a); \
 144         (a)=((ROTATE(l,8)&0x00FF00FF)|(ROTATE(l,24)&0xFF00FF00)); \
 145         }
 146 #else
 147 /* 6 instructions with rotate instruction, else 8 */
 148 #define Endian_Reverse32(a) \
 149         { \
 150         unsigned long l=(a); \
 151         l=(((l&0xFF00FF00)>>8L)|((l&0x00FF00FF)<<8L)); \
 152         (a)=ROTATE(l,16L); \
 153         }
 154 #endif
 155 /*
 156 #define F(x,y,z)        (((x) & (y))  |  ((~(x)) & (z)))
 157 #define G(x,y,z)        (((x) & (z))  |  ((y) & (~(z))))
 158 */
 159
 160 /* As pointed out by Wei Dai <weidai@eskimo.com>, the above can be
 161  * simplified to the code below.  Wei attributes these optimisations
 162  * to Peter Gutmann's SHS code, and he attributes it to Rich Schroeppel.
 163  */
 164 #define F(b,c,d)        ((((c) ^ (d)) & (b)) ^ (d))
 165 #define G(b,c,d)        ((((b) ^ (c)) & (d)) ^ (c))
 166 #define H(b,c,d)        ((b) ^ (c) ^ (d))
 167 #define I(b,c,d)        (((~(d)) | (b)) ^ (c))
 168
 169 #undef ROTATE
 170 #if defined(WIN32)
 171 #define ROTATE(a,n)     _lrotl(a,n)
 172 #else
 173 #define ROTATE(a,n)     (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
 174 #endif
 175
 176
 177 #define R0(a,b,c,d,k,s,t) { \
 178         a+=((k)+(t)+F((b),(c),(d))); \
 179         a=ROTATE(a,s); \
 180         a+=b; };\
 181
 182 #define R1(a,b,c,d,k,s,t) { \
 183         a+=((k)+(t)+G((b),(c),(d))); \
 184         a=ROTATE(a,s); \
 185         a+=b; };
 186
 187 #define R2(a,b,c,d,k,s,t) { \
 188         a+=((k)+(t)+H((b),(c),(d))); \
 189         a=ROTATE(a,s); \
 190         a+=b; };
 191
 192 #define R3(a,b,c,d,k,s,t) { \
 193         a+=((k)+(t)+I((b),(c),(d))); \
 194         a=ROTATE(a,s); \
 195         a+=b; };