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+/* md4.c - MD4 Message-Digest Algorithm
+ * Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Based on md5.c in libgcrypt, but rewritten to compute md4 checksums
+ * using a public domain md4 implementation with the following comments:
+ *
+ * Modified by Wei Dai from Andrew M. Kuchling's md4.c
+ * The original code and all modifications are in the public domain.
+ *
+ * This is the original introductory comment:
+ *
+ * md4.c : MD4 hash algorithm.
+ *
+ * Part of the Python Cryptography Toolkit, version 1.1
+ *
+ * Distribute and use freely; there are no restrictions on further
+ * dissemination and usage except those imposed by the laws of your
+ * country of residence.
+ *
+ */
+
+/* MD4 test suite:
+ * MD4 ("") = 31d6cfe0d16ae931b73c59d7e0c089c0
+ * MD4 ("a") = bde52cb31de33e46245e05fbdbd6fb24
+ * MD4 ("abc") = a448017aaf21d8525fc10ae87aa6729d
+ * MD4 ("message digest") = d9130a8164549fe818874806e1c7014b
+ * MD4 ("abcdefghijklmnopqrstuvwxyz") = d79e1c308aa5bbcdeea8ed63df412da9
+ * MD4 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
+ * 043f8582f241db351ce627e153e7f0e4
+ * MD4 ("123456789012345678901234567890123456789012345678901234567890123456
+ * 78901234567890") = e33b4ddc9c38f2199c3e7b164fcc0536
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include "g10lib.h"
+#include "memory.h"
+#include "cipher.h"
+
+#include "bithelp.h"
+
+
+typedef struct {
+ u32 A,B,C,D; /* chaining variables */
+ u32 nblocks;
+ byte buf[64];
+ int count;
+} MD4_CONTEXT;
+
+
+static void
+md4_init( void *context )
+{
+ MD4_CONTEXT *ctx = context;
+
+ ctx->A = 0x67452301;
+ ctx->B = 0xefcdab89;
+ ctx->C = 0x98badcfe;
+ ctx->D = 0x10325476;
+
+ ctx->nblocks = 0;
+ ctx->count = 0;
+}
+
+#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
+#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
+#define H(x, y, z) ((x) ^ (y) ^ (z))
+
+
+/****************
+ * transform 64 bytes
+ */
+static void
+transform( MD4_CONTEXT *ctx, byte *data )
+{
+ u32 in[16];
+ register u32 A = ctx->A;
+ register u32 B = ctx->B;
+ register u32 C = ctx->C;
+ register u32 D = ctx->D;
+
+#ifdef WORDS_BIGENDIAN
+ {
+ int i;
+ byte *p2, *p1;
+ for(i=0, p1=data, p2=(byte*)in; i < 16; i++, p2 += 4 )
+ {
+ p2[3] = *p1++;
+ p2[2] = *p1++;
+ p2[1] = *p1++;
+ p2[0] = *p1++;
+ }
+ }
+#else
+ memcpy (in, data, 64);
+#endif
+
+ /* Round 1. */
+#define function(a,b,c,d,k,s) a=rol(a+F(b,c,d)+in[k],s);
+ function(A,B,C,D, 0, 3);
+ function(D,A,B,C, 1, 7);
+ function(C,D,A,B, 2,11);
+ function(B,C,D,A, 3,19);
+ function(A,B,C,D, 4, 3);
+ function(D,A,B,C, 5, 7);
+ function(C,D,A,B, 6,11);
+ function(B,C,D,A, 7,19);
+ function(A,B,C,D, 8, 3);
+ function(D,A,B,C, 9, 7);
+ function(C,D,A,B,10,11);
+ function(B,C,D,A,11,19);
+ function(A,B,C,D,12, 3);
+ function(D,A,B,C,13, 7);
+ function(C,D,A,B,14,11);
+ function(B,C,D,A,15,19);
+
+#undef function
+
+ /* Round 2. */
+#define function(a,b,c,d,k,s) a=rol(a+G(b,c,d)+in[k]+0x5a827999,s);
+
+ function(A,B,C,D, 0, 3);
+ function(D,A,B,C, 4, 5);
+ function(C,D,A,B, 8, 9);
+ function(B,C,D,A,12,13);
+ function(A,B,C,D, 1, 3);
+ function(D,A,B,C, 5, 5);
+ function(C,D,A,B, 9, 9);
+ function(B,C,D,A,13,13);
+ function(A,B,C,D, 2, 3);
+ function(D,A,B,C, 6, 5);
+ function(C,D,A,B,10, 9);
+ function(B,C,D,A,14,13);
+ function(A,B,C,D, 3, 3);
+ function(D,A,B,C, 7, 5);
+ function(C,D,A,B,11, 9);
+ function(B,C,D,A,15,13);
+
+#undef function
+
+ /* Round 3. */
+#define function(a,b,c,d,k,s) a=rol(a+H(b,c,d)+in[k]+0x6ed9eba1,s);
+
+ function(A,B,C,D, 0, 3);
+ function(D,A,B,C, 8, 9);
+ function(C,D,A,B, 4,11);
+ function(B,C,D,A,12,15);
+ function(A,B,C,D, 2, 3);
+ function(D,A,B,C,10, 9);
+ function(C,D,A,B, 6,11);
+ function(B,C,D,A,14,15);
+ function(A,B,C,D, 1, 3);
+ function(D,A,B,C, 9, 9);
+ function(C,D,A,B, 5,11);
+ function(B,C,D,A,13,15);
+ function(A,B,C,D, 3, 3);
+ function(D,A,B,C,11, 9);
+ function(C,D,A,B, 7,11);
+ function(B,C,D,A,15,15);
+
+
+ /* Put checksum in context given as argument. */
+ ctx->A += A;
+ ctx->B += B;
+ ctx->C += C;
+ ctx->D += D;
+}
+
+
+
+/* The routine updates the message-digest context to
+ * account for the presence of each of the characters inBuf[0..inLen-1]
+ * in the message whose digest is being computed.
+ */
+static void
+md4_write( void *context, byte *inbuf, size_t inlen)
+{
+ MD4_CONTEXT *hd = context;
+
+ if( hd->count == 64 ) /* flush the buffer */
+ {
+ transform( hd, hd->buf );
+ _gcry_burn_stack (80+6*sizeof(void*));
+ hd->count = 0;
+ hd->nblocks++;
+ }
+ if( !inbuf )
+ return;
+
+ if( hd->count )
+ {
+ for( ; inlen && hd->count < 64; inlen-- )
+ hd->buf[hd->count++] = *inbuf++;
+ md4_write( hd, NULL, 0 );
+ if( !inlen )
+ return;
+ }
+ _gcry_burn_stack (80+6*sizeof(void*));
+
+ while( inlen >= 64 )
+ {
+ transform( hd, inbuf );
+ hd->count = 0;
+ hd->nblocks++;
+ inlen -= 64;
+ inbuf += 64;
+ }
+ for( ; inlen && hd->count < 64; inlen-- )
+ hd->buf[hd->count++] = *inbuf++;
+}
+
+
+
+/* The routine final terminates the message-digest computation and
+ * ends with the desired message digest in mdContext->digest[0...15].
+ * The handle is prepared for a new MD4 cycle.
+ * Returns 16 bytes representing the digest.
+ */
+
+static void
+md4_final( void *context )
+{
+ MD4_CONTEXT *hd = context;
+ u32 t, msb, lsb;
+ byte *p;
+
+ md4_write(hd, NULL, 0); /* flush */;
+
+ t = hd->nblocks;
+ /* multiply by 64 to make a byte count */
+ lsb = t << 6;
+ msb = t >> 26;
+ /* add the count */
+ t = lsb;
+ if( (lsb += hd->count) < t )
+ msb++;
+ /* multiply by 8 to make a bit count */
+ t = lsb;
+ lsb <<= 3;
+ msb <<= 3;
+ msb |= t >> 29;
+
+ if( hd->count < 56 ) /* enough room */
+ {
+ hd->buf[hd->count++] = 0x80; /* pad */
+ while( hd->count < 56 )
+ hd->buf[hd->count++] = 0; /* pad */
+ }
+ else /* need one extra block */
+ {
+ hd->buf[hd->count++] = 0x80; /* pad character */
+ while( hd->count < 64 )
+ hd->buf[hd->count++] = 0;
+ md4_write(hd, NULL, 0); /* flush */;
+ memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
+ }
+ /* append the 64 bit count */
+ hd->buf[56] = lsb ;
+ hd->buf[57] = lsb >> 8;
+ hd->buf[58] = lsb >> 16;
+ hd->buf[59] = lsb >> 24;
+ hd->buf[60] = msb ;
+ hd->buf[61] = msb >> 8;
+ hd->buf[62] = msb >> 16;
+ hd->buf[63] = msb >> 24;
+ transform( hd, hd->buf );
+ _gcry_burn_stack (80+6*sizeof(void*));
+
+ p = hd->buf;
+#ifdef WORDS_BIGENDIAN
+#define X(a) do { *p++ = hd->a ; *p++ = hd->a >> 8; \
+ *p++ = hd->a >> 16; *p++ = hd->a >> 24; } while(0)
+#else /* little endian */
+#define X(a) do { *(u32*)p = (*hd).a ; p += 4; } while(0)
+#endif
+ X(A);
+ X(B);
+ X(C);
+ X(D);
+#undef X
+
+}
+
+static byte *
+md4_read (void *context)
+{
+ MD4_CONTEXT *hd = context;
+ return hd->buf;
+}
+
+static byte asn[18] = /* Object ID is 1.2.840.113549.2.4 */
+ { 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
+ 0x86, 0xf7, 0x0d, 0x02, 0x04, 0x05, 0x00, 0x04, 0x10 };
+
+static gcry_md_oid_spec_t oid_spec_md4[] =
+ {
+ /* iso.member-body.us.rsadsi.digestAlgorithm.md4 */
+ { "1.2.840.113549.2.4" },
+ { NULL },
+ };
+
+gcry_md_spec_t _gcry_digest_spec_md4 =
+ {
+ "MD4", asn, DIM (asn), oid_spec_md4,16,
+ md4_init, md4_write, md4_final, md4_read,
+ sizeof (MD4_CONTEXT)
+ };
+