Passwords - password entry at main menu, stored and checked by server

src/sha1.cpp

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+/* sha1.cpp
+
+Copyright (c) 2005 Michael D. Leonhard
+
+http://tamale.net/
+
+This file is licensed under the terms described in the
+accompanying LICENSE file.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "sha1.h"
+
+// print out memory in hexadecimal
+void SHA1::hexPrinter( unsigned char* c, int l )
+{
+	assert( c );
+	assert( l > 0 );
+	while( l > 0 )
+	{
+		printf( " %02x", *c );
+		l--;
+		c++;
+	}
+}
+
+// circular left bit rotation.  MSB wraps around to LSB
+Uint32 SHA1::lrot( Uint32 x, int bits )
+{
+	return (x<<bits) | (x>>(32 - bits));
+};
+
+// Save a 32-bit unsigned integer to memory, in big-endian order
+void SHA1::storeBigEndianUint32( unsigned char* byte, Uint32 num )
+{
+	assert( byte );
+	byte[0] = (unsigned char)(num>>24);
+	byte[1] = (unsigned char)(num>>16);
+	byte[2] = (unsigned char)(num>>8);
+	byte[3] = (unsigned char)num;
+}
+
+
+// Constructor *******************************************************
+SHA1::SHA1()
+{
+	// make sure that the data type is the right size
+	assert( sizeof( Uint32 ) * 5 == 20 );
+	
+	// initialize
+	H0 = 0x67452301;
+	H1 = 0xefcdab89;
+	H2 = 0x98badcfe;
+	H3 = 0x10325476;
+	H4 = 0xc3d2e1f0;
+	unprocessedBytes = 0;
+	size = 0;
+}
+
+// Destructor ********************************************************
+SHA1::~SHA1()
+{
+	// erase data
+	H0 = H1 = H2 = H3 = H4 = 0;
+	for( int c = 0; c < 64; c++ ) bytes[c] = 0;
+	unprocessedBytes = size = 0;
+}
+
+// process ***********************************************************
+void SHA1::process()
+{
+	assert( unprocessedBytes == 64 );
+	//printf( "process: " ); hexPrinter( bytes, 64 ); printf( "\n" );
+	int t;
+	Uint32 a, b, c, d, e, K, f, W[80];
+	// starting values
+	a = H0;
+	b = H1;
+	c = H2;
+	d = H3;
+	e = H4;
+	// copy and expand the message block
+	for( t = 0; t < 16; t++ ) W[t] = (bytes[t*4] << 24)
+									+(bytes[t*4 + 1] << 16)
+									+(bytes[t*4 + 2] << 8)
+									+ bytes[t*4 + 3];
+	for(; t< 80; t++ ) W[t] = lrot( W[t-3]^W[t-8]^W[t-14]^W[t-16], 1 );
+	
+	/* main loop */
+	Uint32 temp;
+	for( t = 0; t < 80; t++ )
+	{
+		if( t < 20 ) {
+			K = 0x5a827999;
+			f = (b & c) | ((b ^ 0xFFFFFFFF) & d);//TODO: try using ~
+		} else if( t < 40 ) {
+			K = 0x6ed9eba1;
+			f = b ^ c ^ d;
+		} else if( t < 60 ) {
+			K = 0x8f1bbcdc;
+			f = (b & c) | (b & d) | (c & d);
+		} else {
+			K = 0xca62c1d6;
+			f = b ^ c ^ d;
+		}
+		temp = lrot(a,5) + f + e + W[t] + K;
+		e = d;
+		d = c;
+		c = lrot(b,30);
+		b = a;
+		a = temp;
+		//printf( "t=%d %08x %08x %08x %08x %08x\n",t,a,b,c,d,e );
+	}
+	/* add variables */
+	H0 += a;
+	H1 += b;
+	H2 += c;
+	H3 += d;
+	H4 += e;
+	//printf( "Current: %08x %08x %08x %08x %08x\n",H0,H1,H2,H3,H4 );
+	/* all bytes have been processed */
+	unprocessedBytes = 0;
+}
+
+// addBytes **********************************************************
+void SHA1::addBytes( const char* data, int num )
+{
+	assert( data );
+	assert( num > 0 );
+	// add these bytes to the running total
+	size += num;
+	// repeat until all data is processed
+	while( num > 0 )
+	{
+		// number of bytes required to complete block
+		int needed = 64 - unprocessedBytes;
+		assert( needed > 0 );
+		// number of bytes to copy (use smaller of two)
+		int toCopy = (num < needed) ? num : needed;
+		// Copy the bytes
+		memcpy( bytes + unprocessedBytes, data, toCopy );
+		// Bytes have been copied
+		num -= toCopy;
+		data += toCopy;
+		unprocessedBytes += toCopy;
+		
+		// there is a full block
+		if( unprocessedBytes == 64 ) process();
+	}
+}
+
+// digest ************************************************************
+unsigned char* SHA1::getDigest()
+{
+	// save the message size
+	Uint32 totalBitsL = size << 3;
+	Uint32 totalBitsH = size >> 29;
+	// add 0x80 to the message
+	addBytes( "\x80", 1 );
+	
+	unsigned char footer[64] = {
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+	// block has no room for 8-byte filesize, so finish it
+	if( unprocessedBytes > 56 )
+		addBytes( (char*)footer, 64 - unprocessedBytes);
+	assert( unprocessedBytes <= 56 );
+	// how many zeros do we need
+	int neededZeros = 56 - unprocessedBytes;
+	// store file size (in bits) in big-endian format
+	storeBigEndianUint32( footer + neededZeros    , totalBitsH );
+	storeBigEndianUint32( footer + neededZeros + 4, totalBitsL );
+	// finish the final block
+	addBytes( (char*)footer, neededZeros + 8 );
+	// allocate memory for the digest bytes
+	unsigned char* digest = (unsigned char*)malloc( 20 );
+	// copy the digest bytes
+	storeBigEndianUint32( digest, H0 );
+	storeBigEndianUint32( digest + 4, H1 );
+	storeBigEndianUint32( digest + 8, H2 );
+	storeBigEndianUint32( digest + 12, H3 );
+	storeBigEndianUint32( digest + 16, H4 );
+	// return the digest
+	return digest;
+}