Switch from MD5 to SHA-1 for network digests.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 2530

1 files changed, 319 insertions, 0 deletions

diff --git a/src/sha1.c b/src/sha1.c
new file mode 100644
index 00000000..06ab40ad
--- /dev/null
+++ b/src/sha1.c
@@ -0,0 +1,319 @@
+/* sha1.c - SHA1 hash function
+ *	Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * Please see below for more legal information!
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+/*  Test vectors:
+ *
+ *  "abc"
+ *  A999 3E36 4706 816A BA3E  2571 7850 C26C 9CD0 D89D
+ *
+ *  "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
+ *  8498 3E44 1C3B D26E BAAE  4AA1 F951 29E5 E546 70F1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "i_swap.h"
+#include "sha1.h"
+
+void SHA1_Init(sha1_context_t *hd)
+{
+    hd->h0 = 0x67452301;
+    hd->h1 = 0xefcdab89;
+    hd->h2 = 0x98badcfe;
+    hd->h3 = 0x10325476;
+    hd->h4 = 0xc3d2e1f0;
+    hd->nblocks = 0;
+    hd->count = 0;
+}
+
+
+/****************
+ * Transform the message X which consists of 16 32-bit-words
+ */
+static void Transform(sha1_context_t *hd, byte *data)
+{
+    uint32_t a,b,c,d,e,tm;
+    uint32_t x[16];
+
+    /* get values from the chaining vars */
+    a = hd->h0;
+    b = hd->h1;
+    c = hd->h2;
+    d = hd->h3;
+    e = hd->h4;
+
+#ifdef SYS_BIG_ENDIAN
+    memcpy(x, data, 64);
+#else
+    {
+        int i;
+        byte *p2;
+        for(i=0, p2=(byte*)x; i < 16; i++, p2 += 4 )
+        {
+            p2[3] = *data++;
+            p2[2] = *data++;
+            p2[1] = *data++;
+            p2[0] = *data++;
+        }
+    }
+#endif
+
+
+#define K1  0x5A827999L
+#define K2  0x6ED9EBA1L
+#define K3  0x8F1BBCDCL
+#define K4  0xCA62C1D6L
+#define F1(x,y,z)   ( z ^ ( x & ( y ^ z ) ) )
+#define F2(x,y,z)   ( x ^ y ^ z )
+#define F3(x,y,z)   ( ( x & y ) | ( z & ( x | y ) ) )
+#define F4(x,y,z)   ( x ^ y ^ z )
+
+#define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
+
+#define M(i) ( tm =   x[i&0x0f] ^ x[(i-14)&0x0f] \
+		    ^ x[(i-8)&0x0f] ^ x[(i-3)&0x0f] \
+	       , (x[i&0x0f] = rol(tm,1)) )
+
+#define R(a,b,c,d,e,f,k,m)  do { e += rol( a, 5 )     \
+				      + f( b, c, d )  \
+				      + k	      \
+				      + m;	      \
+				 b = rol( b, 30 );    \
+			       } while(0)
+    R( a, b, c, d, e, F1, K1, x[ 0] );
+    R( e, a, b, c, d, F1, K1, x[ 1] );
+    R( d, e, a, b, c, F1, K1, x[ 2] );
+    R( c, d, e, a, b, F1, K1, x[ 3] );
+    R( b, c, d, e, a, F1, K1, x[ 4] );
+    R( a, b, c, d, e, F1, K1, x[ 5] );
+    R( e, a, b, c, d, F1, K1, x[ 6] );
+    R( d, e, a, b, c, F1, K1, x[ 7] );
+    R( c, d, e, a, b, F1, K1, x[ 8] );
+    R( b, c, d, e, a, F1, K1, x[ 9] );
+    R( a, b, c, d, e, F1, K1, x[10] );
+    R( e, a, b, c, d, F1, K1, x[11] );
+    R( d, e, a, b, c, F1, K1, x[12] );
+    R( c, d, e, a, b, F1, K1, x[13] );
+    R( b, c, d, e, a, F1, K1, x[14] );
+    R( a, b, c, d, e, F1, K1, x[15] );
+    R( e, a, b, c, d, F1, K1, M(16) );
+    R( d, e, a, b, c, F1, K1, M(17) );
+    R( c, d, e, a, b, F1, K1, M(18) );
+    R( b, c, d, e, a, F1, K1, M(19) );
+    R( a, b, c, d, e, F2, K2, M(20) );
+    R( e, a, b, c, d, F2, K2, M(21) );
+    R( d, e, a, b, c, F2, K2, M(22) );
+    R( c, d, e, a, b, F2, K2, M(23) );
+    R( b, c, d, e, a, F2, K2, M(24) );
+    R( a, b, c, d, e, F2, K2, M(25) );
+    R( e, a, b, c, d, F2, K2, M(26) );
+    R( d, e, a, b, c, F2, K2, M(27) );
+    R( c, d, e, a, b, F2, K2, M(28) );
+    R( b, c, d, e, a, F2, K2, M(29) );
+    R( a, b, c, d, e, F2, K2, M(30) );
+    R( e, a, b, c, d, F2, K2, M(31) );
+    R( d, e, a, b, c, F2, K2, M(32) );
+    R( c, d, e, a, b, F2, K2, M(33) );
+    R( b, c, d, e, a, F2, K2, M(34) );
+    R( a, b, c, d, e, F2, K2, M(35) );
+    R( e, a, b, c, d, F2, K2, M(36) );
+    R( d, e, a, b, c, F2, K2, M(37) );
+    R( c, d, e, a, b, F2, K2, M(38) );
+    R( b, c, d, e, a, F2, K2, M(39) );
+    R( a, b, c, d, e, F3, K3, M(40) );
+    R( e, a, b, c, d, F3, K3, M(41) );
+    R( d, e, a, b, c, F3, K3, M(42) );
+    R( c, d, e, a, b, F3, K3, M(43) );
+    R( b, c, d, e, a, F3, K3, M(44) );
+    R( a, b, c, d, e, F3, K3, M(45) );
+    R( e, a, b, c, d, F3, K3, M(46) );
+    R( d, e, a, b, c, F3, K3, M(47) );
+    R( c, d, e, a, b, F3, K3, M(48) );
+    R( b, c, d, e, a, F3, K3, M(49) );
+    R( a, b, c, d, e, F3, K3, M(50) );
+    R( e, a, b, c, d, F3, K3, M(51) );
+    R( d, e, a, b, c, F3, K3, M(52) );
+    R( c, d, e, a, b, F3, K3, M(53) );
+    R( b, c, d, e, a, F3, K3, M(54) );
+    R( a, b, c, d, e, F3, K3, M(55) );
+    R( e, a, b, c, d, F3, K3, M(56) );
+    R( d, e, a, b, c, F3, K3, M(57) );
+    R( c, d, e, a, b, F3, K3, M(58) );
+    R( b, c, d, e, a, F3, K3, M(59) );
+    R( a, b, c, d, e, F4, K4, M(60) );
+    R( e, a, b, c, d, F4, K4, M(61) );
+    R( d, e, a, b, c, F4, K4, M(62) );
+    R( c, d, e, a, b, F4, K4, M(63) );
+    R( b, c, d, e, a, F4, K4, M(64) );
+    R( a, b, c, d, e, F4, K4, M(65) );
+    R( e, a, b, c, d, F4, K4, M(66) );
+    R( d, e, a, b, c, F4, K4, M(67) );
+    R( c, d, e, a, b, F4, K4, M(68) );
+    R( b, c, d, e, a, F4, K4, M(69) );
+    R( a, b, c, d, e, F4, K4, M(70) );
+    R( e, a, b, c, d, F4, K4, M(71) );
+    R( d, e, a, b, c, F4, K4, M(72) );
+    R( c, d, e, a, b, F4, K4, M(73) );
+    R( b, c, d, e, a, F4, K4, M(74) );
+    R( a, b, c, d, e, F4, K4, M(75) );
+    R( e, a, b, c, d, F4, K4, M(76) );
+    R( d, e, a, b, c, F4, K4, M(77) );
+    R( c, d, e, a, b, F4, K4, M(78) );
+    R( b, c, d, e, a, F4, K4, M(79) );
+
+    /* update chainig vars */
+    hd->h0 += a;
+    hd->h1 += b;
+    hd->h2 += c;
+    hd->h3 += d;
+    hd->h4 += e;
+}
+
+
+/* Update the message digest with the contents
+ * of INBUF with length INLEN.
+ */
+void SHA1_Update(sha1_context_t *hd, byte *inbuf, size_t inlen)
+{
+    if (hd->count == 64)
+    {
+        /* flush the buffer */
+	Transform(hd, hd->buf);
+	hd->count = 0;
+	hd->nblocks++;
+    }
+    if (!inbuf)
+	return;
+    if (hd->count)
+    {
+	for (; inlen && hd->count < 64; inlen--)
+	    hd->buf[hd->count++] = *inbuf++;
+	SHA1_Update(hd, NULL, 0);
+	if (!inlen)
+	    return;
+    }
+
+    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 computation and
+ * returns the digest.
+ * The handle is prepared for a new cycle, but adding bytes to the
+ * handle will the destroy the returned buffer.
+ * Returns: 20 bytes representing the digest.
+ */
+
+void SHA1_Final(sha1_digest_t digest, sha1_context_t *hd)
+{
+    uint32_t t, msb, lsb;
+    byte *p;
+
+    SHA1_Update(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;
+	SHA1_Update(hd, NULL, 0);  /* flush */;
+	memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
+    }
+    /* append the 64 bit count */
+    hd->buf[56] = msb >> 24;
+    hd->buf[57] = msb >> 16;
+    hd->buf[58] = msb >>  8;
+    hd->buf[59] = msb	   ;
+    hd->buf[60] = lsb >> 24;
+    hd->buf[61] = lsb >> 16;
+    hd->buf[62] = lsb >>  8;
+    hd->buf[63] = lsb	   ;
+    Transform(hd, hd->buf);
+
+    p = hd->buf;
+#ifdef SYS_BIG_ENDIAN
+#define X(a) do { *(uint32_t*)p = hd->h##a ; p += 4; } while(0)
+#else /* little endian */
+#define X(a) do { *p++ = hd->h##a >> 24; *p++ = hd->h##a >> 16;	 \
+		      *p++ = hd->h##a >> 8; *p++ = hd->h##a; } while(0)
+#endif
+    X(0);
+    X(1);
+    X(2);
+    X(3);
+    X(4);
+#undef X
+
+    memcpy(digest, hd->buf, sizeof(sha1_digest_t));
+}
+
+void SHA1_UpdateInt32(sha1_context_t *context, unsigned int val)
+{
+    byte buf[4];
+
+    buf[0] = (val >> 24) & 0xff;
+    buf[1] = (val >> 16) & 0xff;
+    buf[2] = (val >> 8) & 0xff;
+    buf[3] = val & 0xff;
+
+    SHA1_Update(context, buf, 4);
+}
+
+void SHA1_UpdateString(sha1_context_t *context, char *str)
+{
+    SHA1_Update(context, (byte *) str, strlen(str) + 1);
+}
+