base
This commit is contained in:
biosvos
@@ -0,0 +1,433 @@
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#include "md5.h"
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#include <assert.h>
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#include <strings.h>
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#include <iostream>
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//
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//
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// This MD5 module has taken from RSA group homepage..
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// All of copryright and responsbility are belong to SRA. not me ! :)
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// Sean Kim ( kwkim@netpia.com )
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//
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//
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MD5::MD5(){
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init();
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}
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void MD5::update (unsigned char *input, uint4 input_length) {
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uint4 input_index, buffer_index;
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uint4 buffer_space; // how much space is left in buffer
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if (finalized){ // so we can't update!
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cerr << "MD5::update: Can't update a finalized digest!" << endl;
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return;
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}
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// Compute number of bytes mod 64
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buffer_index = (unsigned int)((count[0] >> 3) & 0x3F);
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// Update number of bits
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if ( (count[0] += ((uint4) input_length << 3))<((uint4) input_length << 3) )
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count[1]++;
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count[1] += ((uint4)input_length >> 29);
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buffer_space = 64 - buffer_index; // how much space is left in buffer
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// Transform as many times as possible.
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if (input_length >= buffer_space) { // ie. we have enough to fill the buffer
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// fill the rest of the buffer and transform
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memcpy (buffer + buffer_index, input, buffer_space);
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transform (buffer);
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// now, transform each 64-byte piece of the input, bypassing the buffer
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for (input_index = buffer_space; input_index + 63 < input_length;
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input_index += 64)
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transform (input+input_index);
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buffer_index = 0; // so we can buffer remaining
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}
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else
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input_index=0; // so we can buffer the whole input
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// and here we do the buffering:
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memcpy(buffer+buffer_index, input+input_index, input_length-input_index);
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}
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// MD5 update for files.
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// Like above, except that it works on files (and uses above as a primitive.)
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void MD5::update(FILE *file){
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char szbuffer[1024];
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int len = 0;
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while ((len=fread(szbuffer, 1, 1024, file)))
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{
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update((unsigned char *)szbuffer, len);
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}
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fclose (file);
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}
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// MD5 update for istreams.
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// Like update for files; see above.
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void MD5::update(istream& stream){
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char szbuffer[1024];
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int len;
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while (stream.good()){
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stream.read(szbuffer, 1024); // note that return value of read is unusable.
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len=stream.gcount();
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update((unsigned char *)szbuffer, len);
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}
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}
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// MD5 update for ifstreams.
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// Like update for files; see above.
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void MD5::update(ifstream& stream){
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char szbuffer[1024];
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int len;
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while (stream.good()){
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stream.read(szbuffer, 1024); // note that return value of read is unusable.
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len=stream.gcount();
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update((unsigned char *)szbuffer, len);
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}
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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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void MD5::finalize (){
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unsigned char bits[8];
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unsigned int index, padLen;
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static uint1 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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if (finalized){
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cerr << "MD5::finalize: Already finalized this digest!" << endl;
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return;
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}
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// Save number of bits
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encode (bits, count, 8);
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// Pad out to 56 mod 64.
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index = (uint4) ((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 (digest, state, 16);
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// Zeroize sensitive information
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memset (buffer, 0, sizeof(*buffer));
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finalized=1;
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}
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MD5::MD5(FILE *file){
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init(); // must be called be all constructors
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update(file);
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finalize ();
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}
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MD5::MD5(istream& stream){
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init(); // must called by all constructors
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update (stream);
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finalize();
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}
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MD5::MD5(ifstream& stream){
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init(); // must called by all constructors
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update (stream);
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finalize();
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}
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unsigned char *MD5::raw_digest(){
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uint1 *s = new uint1[16];
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if (!finalized){
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cerr << "MD5::raw_digest: Can't get digest if you haven't "<<
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"finalized the digest!" <<endl;
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return ( (unsigned char*) "");
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}
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memcpy(s, digest, 16);
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return s;
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}
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char *MD5::hex_digest(){
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int i;
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char *s= new char[33];
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if (!finalized){
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cerr << "MD5::hex_digest: Can't get digest if you haven't "<<
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"finalized the digest!" <<endl;
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return "";
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}
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for (i=0; i<16; i++)
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sprintf(s+i*2, "%02x", digest[i]);
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s[32]='\0';
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return s;
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}
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ostream& operator<<(ostream &stream, MD5 context){
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stream << context.hex_digest();
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return stream;
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}
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void MD5::init(){
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finalized=0; // we just started!
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count[0] = 0;
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count[1] = 0;
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state[0] = 0x67452301;
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state[1] = 0xefcdab89;
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state[2] = 0x98badcfe;
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state[3] = 0x10325476;
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}
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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void MD5::transform (uint1 block[64]){
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uint4 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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assert(!finalized); // not just a user error, since the method is private
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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 ( (uint1 *) x, 0, sizeof(x));
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}
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void MD5::encode (uint1 *output, uint4 *input, uint4 len) {
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (uint1) (input[i] & 0xff);
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output[j+1] = (uint1) ((input[i] >> 8) & 0xff);
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output[j+2] = (uint1) ((input[i] >> 16) & 0xff);
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output[j+3] = (uint1) ((input[i] >> 24) & 0xff);
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}
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}
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void MD5::decode (uint4 *output, uint1 *input, uint4 len){
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) |
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(((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24);
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}
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void MD5::memcpy (uint1 *output, uint1 *input, uint4 len){
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unsigned int i;
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for (i = 0; i < len; i++)
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output[i] = input[i];
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}
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void MD5::memset (uint1 *output, uint1 value, uint4 len){
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unsigned int i;
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for (i = 0; i < len; i++)
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output[i] = value;
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}
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inline unsigned int MD5::rotate_left (uint4 x, uint4 n){
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return (x << n) | (x >> (32-n)) ;
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}
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inline unsigned int MD5::F (uint4 x, uint4 y, uint4 z){
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return (x & y) | (~x & z);
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}
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inline unsigned int MD5::G (uint4 x, uint4 y, uint4 z){
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return (x & z) | (y & ~z);
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}
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inline unsigned int MD5::H (uint4 x, uint4 y, uint4 z){
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return x ^ y ^ z;
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}
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inline unsigned int MD5::I (uint4 x, uint4 y, uint4 z){
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return y ^ (x | ~z);
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}
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inline void MD5::FF(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,
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uint4 s, uint4 ac){
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a += F(b, c, d) + x + ac;
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a = rotate_left (a, s) +b;
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}
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inline void MD5::GG(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,
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uint4 s, uint4 ac){
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a += G(b, c, d) + x + ac;
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a = rotate_left (a, s) +b;
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}
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inline void MD5::HH(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,
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uint4 s, uint4 ac){
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a += H(b, c, d) + x + ac;
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a = rotate_left (a, s) +b;
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}
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inline void MD5::II(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,
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uint4 s, uint4 ac){
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a += I(b, c, d) + x + ac;
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a = rotate_left (a, s) +b;
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}
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