arch/all-pc/boot/grub2-aros/grub-core/lib/libgcrypt-grub/cipher/md4.c

   1 /* This file was automatically imported with
   2    import_gcry.py. Please don't modify it */
   3 #include <grub/dl.h>
   4 GRUB_MOD_LICENSE ("GPLv3+");
   5 /* md4.c - MD4 Message-Digest Algorithm
   6  * Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   7  *
   8  * This file is part of Libgcrypt.
   9  *
  10  * Libgcrypt is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as
  12  * published by the Free Software Foundation; either version 2.1 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * Libgcrypt is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  23  *
  24  * Based on md5.c in libgcrypt, but rewritten to compute md4 checksums
  25  * using a public domain md4 implementation with the following comments:
  26  *
  27  * Modified by Wei Dai from Andrew M. Kuchling's md4.c
  28  * The original code and all modifications are in the public domain.
  29  *
  30  * This is the original introductory comment:
  31  *
  32  *  md4.c : MD4 hash algorithm.
  33  *
  34  * Part of the Python Cryptography Toolkit, version 1.1
  35  *
  36  * Distribute and use freely; there are no restrictions on further
  37  * dissemination and usage except those imposed by the laws of your
  38  * country of residence.
  39  *
  40  */
  41
  42 /* MD4 test suite:
  43  * MD4 ("") = 31d6cfe0d16ae931b73c59d7e0c089c0
  44  * MD4 ("a") = bde52cb31de33e46245e05fbdbd6fb24
  45  * MD4 ("abc") = a448017aaf21d8525fc10ae87aa6729d
  46  * MD4 ("message digest") = d9130a8164549fe818874806e1c7014b
  47  * MD4 ("abcdefghijklmnopqrstuvwxyz") = d79e1c308aa5bbcdeea8ed63df412da9
  48  * MD4 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
  49  * 043f8582f241db351ce627e153e7f0e4
  50  * MD4 ("123456789012345678901234567890123456789012345678901234567890123456
  51  * 78901234567890") = e33b4ddc9c38f2199c3e7b164fcc0536
  52  */
  53
  54
  55 #include "g10lib.h"
  56 #include "memory.h"
  57 #include "cipher.h"
  58
  59 #include "bithelp.h"
  60
  61
  62 typedef struct {
  63     u32 A,B,C,D;          /* chaining variables */
  64     u32  nblocks;
  65     byte buf[64];
  66     int  count;
  67 } MD4_CONTEXT;
  68
  69
  70 static void
  71 md4_init( void *context )
  72 {
  73   MD4_CONTEXT *ctx = context;
  74
  75   ctx->A = 0x67452301;
  76   ctx->B = 0xefcdab89;
  77   ctx->C = 0x98badcfe;
  78   ctx->D = 0x10325476;
  79
  80   ctx->nblocks = 0;
  81   ctx->count = 0;
  82 }
  83
  84 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
  85 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
  86 #define H(x, y, z) ((x) ^ (y) ^ (z))
  87
  88
  89 /****************
  90  * transform 64 bytes
  91  */
  92 static void
  93 transform ( MD4_CONTEXT *ctx, const unsigned char *data )
  94 {
  95   u32 in[16];
  96   register u32 A = ctx->A;
  97   register u32 B = ctx->B;
  98   register u32 C = ctx->C;
  99   register u32 D = ctx->D;
 100
 101 #ifdef WORDS_BIGENDIAN
 102   {
 103     int i;
 104     byte *p2;
 105     const byte *p1;
 106     for(i=0, p1=data, p2=(byte*)in; i < 16; i++, p2 += 4 )
 107       {
 108         p2[3] = *p1++;
 109         p2[2] = *p1++;
 110         p2[1] = *p1++;
 111         p2[0] = *p1++;
 112       }
 113   }
 114 #else
 115   memcpy (in, data, 64);
 116 #endif
 117
 118   /* Round 1.  */
 119 #define function(a,b,c,d,k,s) a=rol(a+F(b,c,d)+in[k],s);
 120   function(A,B,C,D, 0, 3);
 121   function(D,A,B,C, 1, 7);
 122   function(C,D,A,B, 2,11);
 123   function(B,C,D,A, 3,19);
 124   function(A,B,C,D, 4, 3);
 125   function(D,A,B,C, 5, 7);
 126   function(C,D,A,B, 6,11);
 127   function(B,C,D,A, 7,19);
 128   function(A,B,C,D, 8, 3);
 129   function(D,A,B,C, 9, 7);
 130   function(C,D,A,B,10,11);
 131   function(B,C,D,A,11,19);
 132   function(A,B,C,D,12, 3);
 133   function(D,A,B,C,13, 7);
 134   function(C,D,A,B,14,11);
 135   function(B,C,D,A,15,19);
 136
 137 #undef function
 138
 139   /* Round 2.  */
 140 #define function(a,b,c,d,k,s) a=rol(a+G(b,c,d)+in[k]+0x5a827999,s);
 141
 142   function(A,B,C,D, 0, 3);
 143   function(D,A,B,C, 4, 5);
 144   function(C,D,A,B, 8, 9);
 145   function(B,C,D,A,12,13);
 146   function(A,B,C,D, 1, 3);
 147   function(D,A,B,C, 5, 5);
 148   function(C,D,A,B, 9, 9);
 149   function(B,C,D,A,13,13);
 150   function(A,B,C,D, 2, 3);
 151   function(D,A,B,C, 6, 5);
 152   function(C,D,A,B,10, 9);
 153   function(B,C,D,A,14,13);
 154   function(A,B,C,D, 3, 3);
 155   function(D,A,B,C, 7, 5);
 156   function(C,D,A,B,11, 9);
 157   function(B,C,D,A,15,13);
 158
 159 #undef function
 160
 161   /* Round 3.  */
 162 #define function(a,b,c,d,k,s) a=rol(a+H(b,c,d)+in[k]+0x6ed9eba1,s);
 163
 164   function(A,B,C,D, 0, 3);
 165   function(D,A,B,C, 8, 9);
 166   function(C,D,A,B, 4,11);
 167   function(B,C,D,A,12,15);
 168   function(A,B,C,D, 2, 3);
 169   function(D,A,B,C,10, 9);
 170   function(C,D,A,B, 6,11);
 171   function(B,C,D,A,14,15);
 172   function(A,B,C,D, 1, 3);
 173   function(D,A,B,C, 9, 9);
 174   function(C,D,A,B, 5,11);
 175   function(B,C,D,A,13,15);
 176   function(A,B,C,D, 3, 3);
 177   function(D,A,B,C,11, 9);
 178   function(C,D,A,B, 7,11);
 179   function(B,C,D,A,15,15);
 180
 181
 182   /* Put checksum in context given as argument.  */
 183   ctx->A += A;
 184   ctx->B += B;
 185   ctx->C += C;
 186   ctx->D += D;
 187 }
 188
 189
 190
 191 /* The routine updates the message-digest context to
 192  * account for the presence of each of the characters inBuf[0..inLen-1]
 193  * in the message whose digest is being computed.
 194  */
 195 static void
 196 md4_write ( void *context, const void *inbuf_arg, size_t inlen)
 197 {
 198   const unsigned char *inbuf = inbuf_arg;
 199   MD4_CONTEXT *hd = context;
 200
 201   if( hd->count == 64 ) /* flush the buffer */
 202     {
 203       transform( hd, hd->buf );
 204       _gcry_burn_stack (80+6*sizeof(void*));
 205       hd->count = 0;
 206       hd->nblocks++;
 207     }
 208   if( !inbuf )
 209     return;
 210
 211   if( hd->count )
 212     {
 213       for( ; inlen && hd->count < 64; inlen-- )
 214         hd->buf[hd->count++] = *inbuf++;
 215       md4_write( hd, NULL, 0 );
 216       if( !inlen )
 217         return;
 218     }
 219   _gcry_burn_stack (80+6*sizeof(void*));
 220
 221   while( inlen >= 64 )
 222     {
 223       transform( hd, inbuf );
 224       hd->count = 0;
 225       hd->nblocks++;
 226       inlen -= 64;
 227       inbuf += 64;
 228     }
 229   for( ; inlen && hd->count < 64; inlen-- )
 230     hd->buf[hd->count++] = *inbuf++;
 231 }
 232
 233
 234
 235 /* The routine final terminates the message-digest computation and
 236  * ends with the desired message digest in mdContext->digest[0...15].
 237  * The handle is prepared for a new MD4 cycle.
 238  * Returns 16 bytes representing the digest.
 239  */
 240
 241 static void
 242 md4_final( void *context )
 243 {
 244   MD4_CONTEXT *hd = context;
 245   u32 t, msb, lsb;
 246   byte *p;
 247
 248   md4_write(hd, NULL, 0); /* flush */;
 249
 250   t = hd->nblocks;
 251   /* multiply by 64 to make a byte count */
 252   lsb = t << 6;
 253   msb = t >> 26;
 254   /* add the count */
 255   t = lsb;
 256   if( (lsb += hd->count) < t )
 257     msb++;
 258   /* multiply by 8 to make a bit count */
 259   t = lsb;
 260   lsb <<= 3;
 261   msb <<= 3;
 262   msb |= t >> 29;
 263
 264   if( hd->count < 56 )  /* enough room */
 265     {
 266       hd->buf[hd->count++] = 0x80; /* pad */
 267       while( hd->count < 56 )
 268         hd->buf[hd->count++] = 0;  /* pad */
 269     }
 270   else /* need one extra block */
 271     {
 272       hd->buf[hd->count++] = 0x80; /* pad character */
 273       while( hd->count < 64 )
 274         hd->buf[hd->count++] = 0;
 275       md4_write(hd, NULL, 0);  /* flush */;
 276       memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
 277     }
 278   /* append the 64 bit count */
 279   hd->buf[56] = lsb        ;
 280   hd->buf[57] = lsb >>  8;
 281   hd->buf[58] = lsb >> 16;
 282   hd->buf[59] = lsb >> 24;
 283   hd->buf[60] = msb        ;
 284   hd->buf[61] = msb >>  8;
 285   hd->buf[62] = msb >> 16;
 286   hd->buf[63] = msb >> 24;
 287   transform( hd, hd->buf );
 288   _gcry_burn_stack (80+6*sizeof(void*));
 289
 290   p = hd->buf;
 291 #ifdef WORDS_BIGENDIAN
 292 #define X(a) do { *p++ = hd->a      ; *p++ = hd->a >> 8;      \
 293                   *p++ = hd->a >> 16; *p++ = hd->a >> 24; } while(0)
 294 #else /* little endian */
 295 #define X(a) do { *(u32*)p = (*hd).a ; p += 4; } while(0)
 296 #endif
 297   X(A);
 298   X(B);
 299   X(C);
 300   X(D);
 301 #undef X
 302
 303 }
 304
 305 static byte *
 306 md4_read (void *context)
 307 {
 308   MD4_CONTEXT *hd = context;
 309   return hd->buf;
 310 }
 311
 312 static byte asn[18] = /* Object ID is 1.2.840.113549.2.4 */
 313   { 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
 314     0x86, 0xf7, 0x0d, 0x02, 0x04, 0x05, 0x00, 0x04, 0x10 };
 315
 316 static gcry_md_oid_spec_t oid_spec_md4[] =
 317   {
 318     /* iso.member-body.us.rsadsi.digestAlgorithm.md4 */
 319     { "1.2.840.113549.2.4" },
 320     { NULL },
 321   };
 322
 323 gcry_md_spec_t _gcry_digest_spec_md4 =
 324   {
 325     "MD4", asn, DIM (asn), oid_spec_md4,16,
 326     md4_init, md4_write, md4_final, md4_read,
 327     sizeof (MD4_CONTEXT)
 328     ,
 329 #ifdef GRUB_UTIL
 330     .modname = "gcry_md4",
 331 #endif
 332     .blocksize = 64
 333   };
 334
 335
 336
 337 GRUB_MOD_INIT(gcry_md4)
 338 {
 339   grub_md_register (&_gcry_digest_spec_md4);
 340 }
 341
 342 GRUB_MOD_FINI(gcry_md4)
 343 {
 344   grub_md_unregister (&_gcry_digest_spec_md4);
 345 }