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+//
+// File : kvi_md5.cpp
+// Creation date : Wed Sep 4 22:16:45 2002 GMT by Szymon Stefanek
+//
+// This file is part of the KVirc irc client distribution
+// Copyright (C) 2002 Szymon Stefanek (pragma at kvirc dot net)
+//
+// This program 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 2
+// of the License, or (at your opinion) any later version.
+//
+// This program 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, write to the Free Software Foundation,
+// Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+
+#define __KVILIB__
+
+
+
+/*
+ ######################################################################
+
+ MD5Sum - MD5 Message Digest Algorithm.
+
+ This code implements the MD5 message-digest algorithm. The algorithm is
+ due to Ron Rivest. This code was written by Colin Plumb in 1993, no
+ copyright is claimed. This code is in the public domain; do with it what
+ you wish.
+
+ Equivalent code is available from RSA Data Security, Inc. This code has
+ been tested against that, and is equivalent, except that you don't need to
+ include two pages of legalese with every copy.
+
+ To compute the message digest of a chunk of bytes, instantiate the class,
+ and repeatedly call one of the Add() members. When finished the Result
+ method will return the Hash and finalize the value.
+
+ Changed so as no longer to depend on Colin Plumb's `usual.h' header
+ definitions; now uses stuff from dpkg's config.h.
+ - Ian Jackson <[email protected]>.
+
+ Changed into a C++ interface and made work with APT's config.h.
+ - Jason Gunthorpe <[email protected]>
+
+ Interface adapted to the KVIrc irc client
+ - Szymon Stefanek <pragma at kvirc dot net>
+
+ The classes use arrays of char that are a specific size. We cast those
+ arrays to uint8_t's and go from there. This allows us to advoid using
+ the uncommon inttypes.h in a public header or internally newing memory.
+ In theory if C9x becomes nicely accepted
+
+ ##################################################################### */
+
+#include "kvi_md5.h"
+#include "kvi_settings.h"
+#include "kvi_bswap.h"
+#include "kvi_memmove.h"
+
+/* Swap n 32 bit longs in given buffer */
+#ifdef BIG_ENDIAN_MACHINE_BYTE_ORDER
+ static void byteSwap(kvi_u32_t *buf,unsigned int words)
+ {
+// kvi_u8_t *p = (kvi_u8_t *)buf;
+// do
+// {
+// *buf++ = (kvi_u32_t)((unsigned)p[3] << 8 | p[2]) << 16 | ((unsigned)p[1] << 8 | p[0]);
+// p += 4;
+// } while (--words);
+ do {
+ *buf = kvi_swap32(*buf);
+ buf++;
+ } while(--words);
+ }
+#else
+ #define byteSwap(buf,words)
+#endif
+
+/* The core of the MD5 algorithm, this alters an existing MD5 hash to
+ reflect the addition of 16 longwords of new data. Add blocks
+ the data and converts bytes into longwords for this routine. */
+
+// The four core functions - F1 is optimized somewhat
+// #define F1(x, y, z) (x & y | ~x & z)
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+// This is the central step in the MD5 algorithm.
+#define MD5STEP(f,w,x,y,z,in,s) \
+ (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
+
+static void MD5Transform(kvi_u32_t buf[4],const kvi_u32_t in[16])
+{
+ register kvi_u32_t a, b, c, d;
+
+ a = buf[0];
+ b = buf[1];
+ c = buf[2];
+ d = buf[3];
+
+ MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+ MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+ MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+ MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+ MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+ MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+ MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+ MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+ MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+ MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+ MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+ MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+ MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+ MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+ MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+ MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+ MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+ MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+ MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+ MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+ MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+ MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+ MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+ MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+ MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+ MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+ MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+ MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+ MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+ MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+ MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+ MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+ MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+ MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+ MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+ MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+ MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+ MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+ MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+ MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+ MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+ MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+ MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+ MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+ MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+ MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+ MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+ MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+ MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+ MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+ MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+ MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+ MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+ MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+ MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+ MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+ MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+ MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+ MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+ MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+ MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+ MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+ MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+ MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+ buf[0] += a;
+ buf[1] += b;
+ buf[2] += c;
+ buf[3] += d;
+}
+
+KviMd5::KviMd5()
+{
+ kvi_u32_t *buf = (kvi_u32_t *)m_pBuf;
+ kvi_u32_t *bytes = (kvi_u32_t *)m_pBytes;
+
+ buf[0] = 0x67452301;
+ buf[1] = 0xefcdab89;
+ buf[2] = 0x98badcfe;
+ buf[3] = 0x10325476;
+
+ bytes[0] = 0;
+ bytes[1] = 0;
+
+ m_bDone = false;
+}
+
+KviMd5::~KviMd5()
+{
+}
+
+bool KviMd5::add(const unsigned char *data,unsigned long len)
+{
+ if(m_bDone)return false;
+
+ kvi_u32_t *buf = (kvi_u32_t *)m_pBuf;
+ kvi_u32_t *bytes = (kvi_u32_t *)m_pBytes;
+ kvi_u32_t *in = (kvi_u32_t *)m_pIn;
+
+ // Update byte count and carry (this could be done with a long long?)
+ kvi_u32_t t = bytes[0];
+
+ if ((bytes[0] = t + len) < t)bytes[1]++;
+
+ // Space available (at least 1)
+ t = 64 - (t & 0x3f);
+ if (t > len)
+ {
+ kvi_fastmove((unsigned char *)in + 64 - t,data,len);
+ return true;
+ }
+
+ // First chunk is an odd size
+ kvi_fastmove((unsigned char *)in + 64 - t,data,t);
+ byteSwap(in, 16);
+
+ MD5Transform(buf,in);
+ data += t;
+ len -= t;
+
+ // Process data in 64-byte chunks
+ while (len >= 64)
+ {
+ kvi_fastmove(in,data,64);
+ byteSwap(in,16);
+ MD5Transform(buf,in);
+ data += 64;
+ len -= 64;
+ }
+
+ // Handle any remaining bytes of data.
+ kvi_memmove(in,data,len);
+
+ return true;
+}
+
+
+// ---------------------------------------------------------------------
+/* Because this must add in the last bytes of the series it prevents anyone
+ from calling add after. */
+
+KviStr KviMd5::result()
+{
+ kvi_u32_t *buf = (kvi_u32_t *)m_pBuf;
+ kvi_u32_t *bytes = (kvi_u32_t *)m_pBytes;
+ kvi_u32_t *in = (kvi_u32_t *)m_pIn;
+
+ if(!m_bDone)
+ {
+ // Number of bytes in In
+ int count = bytes[0] & 0x3f;
+ unsigned char *p = (unsigned char *)in + count;
+
+ // Set the first char of padding to 0x80. There is always room.
+ *p++ = 0x80;
+
+ // Bytes of padding needed to make 56 bytes (-8..55)
+ count = 56 - 1 - count;
+
+ // Padding forces an extra block
+ if (count < 0)
+ {
+ kvi_memset(p,0,count + 8);
+ byteSwap(in, 16);
+ MD5Transform(buf,in);
+ p = (unsigned char *)in;
+ count = 56;
+ }
+
+ kvi_memset(p, 0, count);
+ byteSwap(in, 14);
+
+ // Append length in bits and transform
+ in[14] = bytes[0] << 3;
+ in[15] = bytes[1] << 3 | bytes[0] >> 29;
+ MD5Transform(buf,in);
+ byteSwap(buf,4);
+ m_bDone = true;
+ }
+
+ // m_pBuf now contains the md5 sum
+ KviStr ret;
+ ret.bufferToHex((char *)m_pBuf,16);
+
+ return ret;
+}
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