md5.cpp
上传用户:yhdzpy8989
上传日期:2007-06-13
资源大小:13604k
文件大小:11k
- /*
- * ===========================================================================
- * PRODUCTION $Log: md5.cpp,v $
- * PRODUCTION Revision 1000.1 2004/06/01 19:40:16 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.6
- * PRODUCTION
- * ===========================================================================
- */
- /* $Id: md5.cpp,v 1000.1 2004/06/01 19:40:16 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software/database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software/database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Author: Aaron Ucko (C++ interface); original author unknown
- *
- * File Description:
- * CMD5 - class for computing Message Digest version 5 checksums.
- *
- */
- #include <ncbi_pch.hpp>
- #include <util/md5.hpp>
- #include <util/util_exception.hpp>
- BEGIN_NCBI_SCOPE
- // Note: this code is harmless on little-endian machines.
- inline
- static void s_ByteReverse(unsigned char* buf, size_t longs)
- {
- Uint4 t;
- do {
- t = (Uint4) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
- ((unsigned) buf[1] << 8 | buf[0]);
- *(reinterpret_cast<Uint4*>(buf)) = t;
- buf += 4;
- } while (--longs);
- }
- // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
- // initialization constants.
- CMD5::CMD5(void)
- : m_Bits(0), m_Finalized(false)
- {
- m_Buf[0] = 0x67452301;
- m_Buf[1] = 0xefcdab89;
- m_Buf[2] = 0x98badcfe;
- m_Buf[3] = 0x10325476;
- }
- // Update state to reflect the concatenation of another buffer full of bytes.
- void CMD5::Update(const char* buf, size_t length)
- {
- if ( m_Finalized ) {
- NCBI_THROW(CUtilException, eWrongCommand,
- "attempt to update a finalized MD5 instance");
- }
- // Number of leftover bytes in m_In
- unsigned int tmp = (unsigned int)((m_Bits >> 3) % sizeof(m_In));
-
- // Update bit count
- m_Bits += length << 3;
- // Handle any leading odd-sized chunks
- if ( tmp ) {
- unsigned char* p = m_In + tmp;
- tmp = kBlockSize - tmp;
- if (length < tmp) {
- memcpy(p, buf, length);
- return;
- }
- memcpy(p, buf, tmp);
- #ifdef WORDS_BIGENDIAN
- s_ByteReverse(m_In, 16);
- #endif
- Transform();
- buf += tmp;
- length -= tmp;
- }
- // Process remaining data in kBlockSize-byte chunks
- while (length >= kBlockSize) {
- memcpy(m_In, buf, kBlockSize);
- #ifdef WORDS_BIGENDIAN
- s_ByteReverse(m_In, 16);
- #endif
- Transform();
- buf += kBlockSize;
- length -= kBlockSize;
- }
- // Handle any remaining bytes of data
- memcpy(m_In, buf, length);
- }
- // Final wrapup - pad to kBlockSize-byte boundary with the bit pattern
- // 1 0* (64-bit count of bits processed, MSB-first).
- void CMD5::Finalize(unsigned char digest[16])
- {
- if ( m_Finalized ) {
- memcpy(digest, m_Buf, 16);
- return;
- }
- // Compute number of bytes mod kBlockSize
- int count = (int)((m_Bits >> 3) % kBlockSize);
- // Set the first char of padding to 0x80. This is safe since there is
- // always at least one byte free.
- unsigned char *p = m_In + count;
- *p++ = 0x80;
- // Bytes of padding needed to make kBlockSize bytes
- count = kBlockSize - 1 - count;
- // Pad out to 56 mod kBlockSize
- if (count < 8) {
- // Two lots of padding: Pad the first block to kBlockSize bytes
- memset(p, 0, count);
- #ifdef WORDS_BIGENDIAN
- s_ByteReverse(m_In, 16);
- #endif
- Transform();
- // Now fill the next block with 56 bytes
- memset(m_In, 0, kBlockSize - 8);
- } else {
- // Pad block to 56 bytes
- memset(p, 0, count - 8);
- #ifdef WORDS_BIGENDIAN
- s_ByteReverse(m_In, 14);
- #endif
- }
- // Append length in bits and transform
- reinterpret_cast<Uint4*>(m_In)[14] = static_cast<Uint4>(m_Bits);
- reinterpret_cast<Uint4*>(m_In)[15] = static_cast<Uint4>(m_Bits >> 32);
- Transform();
- #ifdef WORDS_BIGENDIAN
- s_ByteReverse(reinterpret_cast<unsigned char*>(m_Buf), 4);
- #endif
- memcpy(digest, m_Buf, 16);
- memset(m_In, 0, kBlockSize); // may be sensitive
- }
- string CMD5::GetHexSum(unsigned char digest[16])
- {
- CNcbiOstrstream oss;
- for (size_t i = 0; i < 16; ++i) {
- oss << hex << setw(2) << setfill('0') << (int)digest[i];
- }
- return CNcbiOstrstreamToString(oss);
- }
- // 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, data, s)
- ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
- // The core of the MD5 algorithm, this alters an existing MD5 hash to
- // reflect the addition of 16 longwords of new data. MD5Update blocks
- // the data and converts bytes into longwords for this routine.
- void CMD5::Transform(void)
- {
- Uint4 a, b, c, d;
- Uint4* inw = reinterpret_cast<Uint4*>(m_In);
- a = m_Buf[0];
- b = m_Buf[1];
- c = m_Buf[2];
- d = m_Buf[3];
- MD5STEP(F1, a, b, c, d, inw[0] + 0xd76aa478, 7);
- MD5STEP(F1, d, a, b, c, inw[1] + 0xe8c7b756, 12);
- MD5STEP(F1, c, d, a, b, inw[2] + 0x242070db, 17);
- MD5STEP(F1, b, c, d, a, inw[3] + 0xc1bdceee, 22);
- MD5STEP(F1, a, b, c, d, inw[4] + 0xf57c0faf, 7);
- MD5STEP(F1, d, a, b, c, inw[5] + 0x4787c62a, 12);
- MD5STEP(F1, c, d, a, b, inw[6] + 0xa8304613, 17);
- MD5STEP(F1, b, c, d, a, inw[7] + 0xfd469501, 22);
- MD5STEP(F1, a, b, c, d, inw[8] + 0x698098d8, 7);
- MD5STEP(F1, d, a, b, c, inw[9] + 0x8b44f7af, 12);
- MD5STEP(F1, c, d, a, b, inw[10] + 0xffff5bb1, 17);
- MD5STEP(F1, b, c, d, a, inw[11] + 0x895cd7be, 22);
- MD5STEP(F1, a, b, c, d, inw[12] + 0x6b901122, 7);
- MD5STEP(F1, d, a, b, c, inw[13] + 0xfd987193, 12);
- MD5STEP(F1, c, d, a, b, inw[14] + 0xa679438e, 17);
- MD5STEP(F1, b, c, d, a, inw[15] + 0x49b40821, 22);
- MD5STEP(F2, a, b, c, d, inw[1] + 0xf61e2562, 5);
- MD5STEP(F2, d, a, b, c, inw[6] + 0xc040b340, 9);
- MD5STEP(F2, c, d, a, b, inw[11] + 0x265e5a51, 14);
- MD5STEP(F2, b, c, d, a, inw[0] + 0xe9b6c7aa, 20);
- MD5STEP(F2, a, b, c, d, inw[5] + 0xd62f105d, 5);
- MD5STEP(F2, d, a, b, c, inw[10] + 0x02441453, 9);
- MD5STEP(F2, c, d, a, b, inw[15] + 0xd8a1e681, 14);
- MD5STEP(F2, b, c, d, a, inw[4] + 0xe7d3fbc8, 20);
- MD5STEP(F2, a, b, c, d, inw[9] + 0x21e1cde6, 5);
- MD5STEP(F2, d, a, b, c, inw[14] + 0xc33707d6, 9);
- MD5STEP(F2, c, d, a, b, inw[3] + 0xf4d50d87, 14);
- MD5STEP(F2, b, c, d, a, inw[8] + 0x455a14ed, 20);
- MD5STEP(F2, a, b, c, d, inw[13] + 0xa9e3e905, 5);
- MD5STEP(F2, d, a, b, c, inw[2] + 0xfcefa3f8, 9);
- MD5STEP(F2, c, d, a, b, inw[7] + 0x676f02d9, 14);
- MD5STEP(F2, b, c, d, a, inw[12] + 0x8d2a4c8a, 20);
- MD5STEP(F3, a, b, c, d, inw[5] + 0xfffa3942, 4);
- MD5STEP(F3, d, a, b, c, inw[8] + 0x8771f681, 11);
- MD5STEP(F3, c, d, a, b, inw[11] + 0x6d9d6122, 16);
- MD5STEP(F3, b, c, d, a, inw[14] + 0xfde5380c, 23);
- MD5STEP(F3, a, b, c, d, inw[1] + 0xa4beea44, 4);
- MD5STEP(F3, d, a, b, c, inw[4] + 0x4bdecfa9, 11);
- MD5STEP(F3, c, d, a, b, inw[7] + 0xf6bb4b60, 16);
- MD5STEP(F3, b, c, d, a, inw[10] + 0xbebfbc70, 23);
- MD5STEP(F3, a, b, c, d, inw[13] + 0x289b7ec6, 4);
- MD5STEP(F3, d, a, b, c, inw[0] + 0xeaa127fa, 11);
- MD5STEP(F3, c, d, a, b, inw[3] + 0xd4ef3085, 16);
- MD5STEP(F3, b, c, d, a, inw[6] + 0x04881d05, 23);
- MD5STEP(F3, a, b, c, d, inw[9] + 0xd9d4d039, 4);
- MD5STEP(F3, d, a, b, c, inw[12] + 0xe6db99e5, 11);
- MD5STEP(F3, c, d, a, b, inw[15] + 0x1fa27cf8, 16);
- MD5STEP(F3, b, c, d, a, inw[2] + 0xc4ac5665, 23);
- MD5STEP(F4, a, b, c, d, inw[0] + 0xf4292244, 6);
- MD5STEP(F4, d, a, b, c, inw[7] + 0x432aff97, 10);
- MD5STEP(F4, c, d, a, b, inw[14] + 0xab9423a7, 15);
- MD5STEP(F4, b, c, d, a, inw[5] + 0xfc93a039, 21);
- MD5STEP(F4, a, b, c, d, inw[12] + 0x655b59c3, 6);
- MD5STEP(F4, d, a, b, c, inw[3] + 0x8f0ccc92, 10);
- MD5STEP(F4, c, d, a, b, inw[10] + 0xffeff47d, 15);
- MD5STEP(F4, b, c, d, a, inw[1] + 0x85845dd1, 21);
- MD5STEP(F4, a, b, c, d, inw[8] + 0x6fa87e4f, 6);
- MD5STEP(F4, d, a, b, c, inw[15] + 0xfe2ce6e0, 10);
- MD5STEP(F4, c, d, a, b, inw[6] + 0xa3014314, 15);
- MD5STEP(F4, b, c, d, a, inw[13] + 0x4e0811a1, 21);
- MD5STEP(F4, a, b, c, d, inw[4] + 0xf7537e82, 6);
- MD5STEP(F4, d, a, b, c, inw[11] + 0xbd3af235, 10);
- MD5STEP(F4, c, d, a, b, inw[2] + 0x2ad7d2bb, 15);
- MD5STEP(F4, b, c, d, a, inw[9] + 0xeb86d391, 21);
- m_Buf[0] += a;
- m_Buf[1] += b;
- m_Buf[2] += c;
- m_Buf[3] += d;
- }
- END_NCBI_SCOPE
- /*
- * ===========================================================================
- * $Log: md5.cpp,v $
- * Revision 1000.1 2004/06/01 19:40:16 gouriano
- * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.6
- *
- * Revision 1.6 2004/05/17 21:06:02 gorelenk
- * Added include of PCH ncbi_pch.hpp
- *
- * Revision 1.5 2003/10/01 21:15:15 ivanov
- * Get rid of compilation warnings; some formal code rearrangement
- *
- * Revision 1.4 2003/07/30 12:42:22 ucko
- * Properly initialize m_Finalized to false in the default constructor.
- *
- * Revision 1.3 2003/07/29 23:58:43 ucko
- * Fix log for last revision, sigh.
- *
- * Revision 1.2 2003/07/29 23:57:33 ucko
- * CMD5::GetHexSum: go up to 16 rather than sizeof(digest), as the latter
- * is really just sizeof(unsigned char*) in this context.
- *
- * Revision 1.1 2003/07/29 21:29:26 ucko
- * Add MD5 support (cribbed from the C Toolkit)
- *
- * ===========================================================================
- */