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add cleaned up MD5 C++ implementation for general use
This commit is contained in:
Paul Davis
parent
9658096de3
commit
deb6c227e7
2 changed files with 405 additions and 0 deletions
341
libs/pbd/md5.cc
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341
libs/pbd/md5.cc
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/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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* rights reserved.
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*
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* License to copy and use this software is granted provided that it
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* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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* Algorithm" in all material mentioning or referencing this software
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* or this function.
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*
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* License is also granted to make and use derivative works provided
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* that such works are identified as "derived from the RSA Data
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* Security, Inc. MD5 Message-Digest Algorithm" in all material
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* mentioning or referencing the derived work.
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*
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* RSA Data Security, Inc. makes no representations concerning either
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* the merchantability of this software or the suitability of this
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* software for any particular purpose. It is provided "as is"
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* without express or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this
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* documentation and/or software.
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*/
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#include <stdio.h>
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#include "pbd/md5.h"
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// Constants for MD5Transform routine.
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static const int S11 = 7;
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static const int S12 = 12;
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static const int S13 = 17;
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static const int S14 = 22;
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static const int S21 = 5;
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static const int S22 = 9;
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static const int S23 = 14;
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static const int S24 = 20;
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static const int S31 = 4;
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static const int S32 = 11;
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static const int S33 = 16;
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static const int S34 = 23;
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static const int S41 = 6;
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static const int S42 = 10;
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static const int S43 = 15;
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static const int S44 = 21;
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static unsigned char PADDING[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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// F, G, H and I are basic MD5 functions.
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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// ROTATE_LEFT rotates x left n bits.
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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// Rotation is separate from addition to prevent recomputation.
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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MD5::MD5 ()
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{
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Init ();
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}
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void
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MD5::Init ()
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{
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context.count[0] = context.count[1] = 0;
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// Load magic initialization constants.
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context.state[0] = 0x67452301;
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context.state[1] = 0xefcdab89;
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context.state[2] = 0x98badcfe;
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context.state[3] = 0x10325476;
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}
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/** MD5 block update operation. Continues an MD5 message-digest
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* operation, processing another message block, and updating the
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* context.
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*/
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void
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MD5::Update(uint8_t const *input, size_t inputLen)
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{
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unsigned int i, index, partLen;
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// Compute number of bytes mod 64
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index = (unsigned int)((context.count[0] >> 3) & 0x3F);
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// Update number of bits
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if ((context.count[0] += ((uint32_t)inputLen << 3))
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< ((uint32_t)inputLen << 3))
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context.count[1]++;
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context.count[1] += ((uint32_t)inputLen >> 29);
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partLen = 64 - index;
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// Transform as many times as possible.
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if (inputLen >= partLen) {
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memcpy((void*)&context.buffer[index], (void const *)input, partLen);
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Transform (context.state, context.buffer);
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for (i = partLen; i + 63 < inputLen; i += 64) {
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Transform (context.state, (uint8_t const *) &input[i]);
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}
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index = 0;
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}
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else
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i = 0;
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/* Buffer remaining input */
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memcpy ((void*)&context.buffer[index], (void const *)&input[i], inputLen-i);
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}
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// MD5 finalization. Ends an MD5 message-digest operation, writing the
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// the message digest and zeroizing the context.
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// Writes to digestRaw
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void
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MD5::Final()
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{
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uint8_t bits[8];
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size_t index, padLen;
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// Save number of bits
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Encode (bits, context.count, 8);
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// Pad out to 56 mod 64.
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index = (size_t)((context.count[0] >> 3) & 0x3f);
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padLen = (index < 56) ? (56 - index) : (120 - index);
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Update (PADDING, padLen);
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// Append length (before padding)
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Update (bits, 8);
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// Store state in digest
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Encode (digestRaw, context.state, 16);
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// Zeroize sensitive information.
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memset((void*)&context, 0, sizeof (context));
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writeToString();
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}
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/// Buffer must be 32+1 (nul) = 33 chars long at least
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void
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MD5::writeToString()
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{
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int pos;
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for (pos = 0; pos < 16; pos++) {
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sprintf (digestChars+(pos*2), "%02x", digestRaw[pos]);
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}
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}
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/// Load a file from disk and digest it
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// Digests a file and returns the result.
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char*
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MD5::digestFile (char *filename)
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{
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Init();
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FILE *file;
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int len;
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unsigned char buffer[1024];
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if ((file = fopen (filename, "rb")) == NULL) {
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printf ("%s can't be opened\n", filename);
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} else {
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while ((len = fread (buffer, 1, 1024, file))) {
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Update (buffer, len);
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}
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Final();
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fclose (file);
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}
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return digestChars;
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}
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/// Digests a byte-array already in memory
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char*
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MD5::digestMemory (uint8_t const * memchunk, size_t len)
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{
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Init ();
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Update (memchunk, len);
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Final ();
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return digestChars;
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}
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// Digests a string and prints the result.
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char*
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MD5::digestString (char const * string)
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{
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Init ();
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Update ((uint8_t const *) string, strlen (string));
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Final();
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return digestChars;
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}
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void
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MD5::Transform (uint32_t state[4], uint8_t const * block)
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{
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uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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Decode (x, block, 64);
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/* Round 1 */
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FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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// Zeroize sensitive information.
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memset((void*)x, 0, sizeof (x));
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}
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/* Encodes input (uint32_t) into output (unsigned char). Assumes len is
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* a multiple of 4.
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*/
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void
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MD5::Encode (uint8_t *output, uint32_t const * input, size_t len)
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{
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size_t i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (unsigned char)(input[i] & 0xff);
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output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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}
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}
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/** Decodes input (unsigned char) into output (uint32_t). Assumes len is
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* a multiple of 4.
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*/
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void
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MD5::Decode (uint32_t *output, uint8_t const * input, size_t len)
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{
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size_t i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
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(((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
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}
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64
libs/pbd/pbd/md5.h
Normal file
64
libs/pbd/pbd/md5.h
Normal file
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@ -0,0 +1,64 @@
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/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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* rights reserved.
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*
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* License to copy and use this software is granted provided that it
|
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* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
|
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* Algorithm" in all material mentioning or referencing this software
|
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* or this function.
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*
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* License is also granted to make and use derivative works provided
|
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* that such works are identified as "derived from the RSA Data
|
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* Security, Inc. MD5 Message-Digest Algorithm" in all material
|
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* mentioning or referencing the derived work.
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*
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* RSA Data Security, Inc. makes no representations concerning either
|
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* the merchantability of this software or the suitability of this
|
||||
* software for any particular purpose. It is provided "as is"
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* without express or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this
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* documentation and/or software.
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*/
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#ifndef __libpbd_md5_h__
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#define __libpbd_md5_h__
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#include <string.h>
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#include <stdint.h>
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class MD5
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{
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public:
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MD5();
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// an MD5 digest is a 16-byte number (32 hex digits)
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uint8_t digestRaw[16] ;
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// This version of the digest is actually
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// a "printf'd" version of the digest.
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char digestChars[33] ;
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void writeToString ();
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char* digestFile (char *filename);
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char* digestMemory (uint8_t const * memchunk, size_t len);
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char* digestString (char const *string);
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private:
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struct context_t {
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uint32_t state[4]; /* state (ABCD) */
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uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */
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uint8_t buffer[64]; /* input buffer */
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};
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context_t context;
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void Init ();
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void Transform (uint32_t state[4], uint8_t const * block);
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void Encode (uint8_t *output, uint32_t const *input, size_t len);
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void Decode (uint32_t *output, uint8_t const * input, size_t len);
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void Update (uint8_t const *input, size_t inputLen);
|
||||
void Final ();
|
||||
|
||||
};
|
||||
|
||||
#endif /* __libpbd_md5_h__ */
|
||||
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Add table
Add a link
Reference in a new issue