a

libsec/md5block.c

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+#include "os.h"
+#include <libsec.h>
+
+/*
+ *  rfc1321 requires that I include this.  The code is new.  The constants
+ *  all come from the rfc (hence the copyright).  We trade a table for the
+ *  macros in rfc.  The total size is a lot less. -- presotto
+ *
+ *	Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+ *	rights reserved.
+ *
+ *	License to copy and use this software is granted provided that it
+ *	is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+ *	Algorithm" in all material mentioning or referencing this software
+ *	or this function.
+ *
+ *	License is also granted to make and use derivative works provided
+ *	that such works are identified as "derived from the RSA Data
+ *	Security, Inc. MD5 Message-Digest Algorithm" in all material
+ *	mentioning or referencing the derived work.
+ *
+ *	RSA Data Security, Inc. makes no representations concerning either
+ *	the merchantability of this software or the suitability of this
+ *	software forany particular purpose. It is provided "as is"
+ *	without express or implied warranty of any kind.
+ *	These notices must be retained in any copies of any part of this
+ *	documentation and/or software.
+ */
+
+/*
+ *	Rotate ammounts used in the algorithm
+ */
+enum
+{
+	S11=	7,
+	S12=	12,
+	S13=	17,
+	S14=	22,
+
+	S21=	5,
+	S22=	9,
+	S23=	14,
+	S24=	20,
+
+	S31=	4,
+	S32=	11,
+	S33=	16,
+	S34=	23,
+
+	S41=	6,
+	S42=	10,
+	S43=	15,
+	S44=	21,
+};
+
+static u32int md5tab[] =
+{
+	/* round 1 */
+/*[0]*/	0xd76aa478,	
+	0xe8c7b756,	
+	0x242070db,	
+	0xc1bdceee,	
+	0xf57c0faf,	
+	0x4787c62a,	
+	0xa8304613,	
+	0xfd469501,	
+	0x698098d8,	
+	0x8b44f7af,	
+	0xffff5bb1,	
+	0x895cd7be,	
+	0x6b901122,	
+	0xfd987193,	
+	0xa679438e,	
+	0x49b40821,
+
+	/* round 2 */
+/*[16]*/0xf61e2562,	
+	0xc040b340,	
+	0x265e5a51,	
+	0xe9b6c7aa,	
+	0xd62f105d,	
+	 0x2441453,	
+	0xd8a1e681,	
+	0xe7d3fbc8,	
+	0x21e1cde6,	
+	0xc33707d6,	
+	0xf4d50d87,	
+	0x455a14ed,	
+	0xa9e3e905,	
+	0xfcefa3f8,	
+	0x676f02d9,	
+	0x8d2a4c8a,
+
+	/* round 3 */
+/*[32]*/0xfffa3942,	
+	0x8771f681,	
+	0x6d9d6122,	
+	0xfde5380c,	
+	0xa4beea44,	
+	0x4bdecfa9,	
+	0xf6bb4b60,	
+	0xbebfbc70,	
+	0x289b7ec6,	
+	0xeaa127fa,	
+	0xd4ef3085,	
+	 0x4881d05,	
+	0xd9d4d039,	
+	0xe6db99e5,	
+	0x1fa27cf8,	
+	0xc4ac5665,	
+
+	/* round 4 */
+/*[48]*/0xf4292244,	
+	0x432aff97,	
+	0xab9423a7,	
+	0xfc93a039,	
+	0x655b59c3,	
+	0x8f0ccc92,	
+	0xffeff47d,	
+	0x85845dd1,	
+	0x6fa87e4f,	
+	0xfe2ce6e0,	
+	0xa3014314,	
+	0x4e0811a1,	
+	0xf7537e82,	
+	0xbd3af235,	
+	0x2ad7d2bb,	
+	0xeb86d391,	
+};
+
+static void decode(u32int*, uchar*, ulong);
+extern void _md5block(uchar *p, ulong len, u32int *s);
+
+void
+_md5block(uchar *p, ulong len, u32int *s)
+{
+	u32int a, b, c, d, sh;
+	u32int *t;
+	uchar *end;
+	u32int x[16];
+
+	for(end = p+len; p < end; p += 64){
+		a = s[0];
+		b = s[1];
+		c = s[2];
+		d = s[3];
+
+		decode(x, p, 64);
+	
+		t = md5tab;
+		sh = 0;
+		for(; sh != 16; t += 4){
+			a += ((c ^ d) & b) ^ d;
+			a += x[sh] + t[0];
+			a = (a << S11) | (a >> (32 - S11));
+			a += b;
+
+			d += ((b ^ c) & a) ^ c;
+			d += x[sh + 1] + t[1];
+			d = (d << S12) | (d >> (32 - S12));
+			d += a;
+
+			c += ((a ^ b) & d) ^ b;
+			c += x[sh + 2] + t[2];
+			c = (c << S13) | (c >> (32 - S13));
+			c += d;
+
+			b += ((d ^ a) & c) ^ a;
+			b += x[sh + 3] + t[3];
+			b = (b << S14) | (b >> (32 - S14));
+			b += c;
+
+			sh += 4;
+		}
+		sh = 1;
+		for(; sh != 1+20*4; t += 4){
+			a += ((b ^ c) & d) ^ c;
+			a += x[sh & 0xf] + t[0];
+			a = (a << S21) | (a >> (32 - S21));
+			a += b;
+
+			d += ((a ^ b) & c) ^ b;
+			d += x[(sh + 5) & 0xf] + t[1];
+			d = (d << S22) | (d >> (32 - S22));
+			d += a;
+
+			c += ((d ^ a) & b) ^ a;
+			c += x[(sh + 10) & 0xf] + t[2];
+			c = (c << S23) | (c >> (32 - S23));
+			c += d;
+
+			b += ((c ^ d) & a) ^ d;
+			b += x[(sh + 15) & 0xf] + t[3];
+			b = (b << S24) | (b >> (32 - S24));
+			b += c;
+
+			sh += 20;
+		}
+		sh = 5;
+		for(; sh != 5+12*4; t += 4){
+			a += b ^ c ^ d;
+			a += x[sh & 0xf] + t[0];
+			a = (a << S31) | (a >> (32 - S31));
+			a += b;
+
+			d += a ^ b ^ c;
+			d += x[(sh + 3) & 0xf] + t[1];
+			d = (d << S32) | (d >> (32 - S32));
+			d += a;
+
+			c += d ^ a ^ b;
+			c += x[(sh + 6) & 0xf] + t[2];
+			c = (c << S33) | (c >> (32 - S33));
+			c += d;
+
+			b += c ^ d ^ a;
+			b += x[(sh + 9) & 0xf] + t[3];
+			b = (b << S34) | (b >> (32 - S34));
+			b += c;
+
+			sh += 12;
+		}
+		sh = 0;
+		for(; sh != 28*4; t += 4){
+			a += c ^ (b | ~d);
+			a += x[sh & 0xf] + t[0];
+			a = (a << S41) | (a >> (32 - S41));
+			a += b;
+
+			d += b ^ (a | ~c);
+			d += x[(sh + 7) & 0xf] + t[1];
+			d = (d << S42) | (d >> (32 - S42));
+			d += a;
+
+			c += a ^ (d | ~b);
+			c += x[(sh + 14) & 0xf] + t[2];
+			c = (c << S43) | (c >> (32 - S43));
+			c += d;
+
+			b += d ^ (c | ~a);
+			b += x[(sh + 21) & 0xf] + t[3];
+			b = (b << S44) | (b >> (32 - S44));
+			b += c;
+
+			sh += 28;
+		}
+
+		s[0] += a;
+		s[1] += b;
+		s[2] += c;
+		s[3] += d;
+	}
+}
+
+/*
+ *	decodes input (uchar) into output (u32int). Assumes len is
+ *	a multiple of 4.
+ */
+static void
+decode(u32int *output, uchar *input, ulong len)
+{
+	uchar *e;
+
+	for(e = input+len; input < e; input += 4)
+		*output++ = input[0] | (input[1] << 8) |
+			(input[2] << 16) | (input[3] << 24);
+}