// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c// The original code and all modifications are in the public domain.// This is the original introductory comment:/* *  md2.c : MD2 hash algorithm. * * Part of the Python Cryptography Toolkit, version 1.1 * * Distribute and use freely; there are no restrictions on further  * dissemination and usage except those imposed by the laws of your  * country of residence. * */#include "pch.h"#include "md2.h"NAMESPACE_BEGIN(CryptoPP)MD2::MD2()	: m_X(48), m_C(16), m_buf(16){	Init();}void MD2::Init(){	memset(m_X, 0, 48);	memset(m_C, 0, 16);	memset(m_buf, 0, 16);	m_count = 0;}void MD2::Update(const byte *buf, unsigned int len){	static const byte S[256] = {		41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,		19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,		76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,		138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,		245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,		148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,		39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,		181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,		150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,		112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,		96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,		85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,		234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,		129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,		8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,		203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,		166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,		31, 26, 219, 153, 141, 51, 159, 17, 131, 20	};	while (len)     {		word32 L = (16-m_count) < len ? (16-m_count) : len;		memcpy(m_buf+m_count, buf, L);		m_count+=L;		buf+=L;		len-=L;		if (m_count==16) 		{			byte t;			int i,j;						m_count=0;			memcpy(m_X+16, m_buf, 16);			t=m_C[15];			for(i=0; i<16; i++)			{				m_X[32+i]=m_X[16+i]^m_X[i];				t=m_C[i]^=S[m_buf[i]^t];			}						t=0;			for(i=0; i<18; i++)			{				for(j=0; j<48; j++)					t=m_X[j]^=S[t];				t=(t+i) & 0xFF;			}		}    }}void MD2::TruncatedFinal(byte *hash, unsigned int size){	ThrowIfInvalidTruncatedSize(size);	byte padding[16];	word32 padlen;	unsigned int i;	padlen= 16-m_count;	for(i=0; i<padlen; i++) padding[i]=(byte)padlen;	Update(padding, padlen);	Update(m_C, 16);	memcpy(hash, m_X, size);	Init();}NAMESPACE_END