1// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c 2// The original code and all modifications are in the public domain. 3 4// This is the original introductory comment: 5 6/* 7 * md2.c : MD2 hash algorithm. 8 * 9 * Part of the Python Cryptography Toolkit, version 1.1 10 * 11 * Distribute and use freely; there are no restrictions on further 12 * dissemination and usage except those imposed by the laws of your 13 * country of residence. 14 * 15 */ 16 17#include "pch.h" 18#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1 19#include "md2.h" 20 21NAMESPACE_BEGIN(CryptoPP) 22namespace Weak1 { 23 24MD2::MD2() 25 : m_X(48), m_C(16), m_buf(16) 26{ 27 Init(); 28} 29 30void MD2::Init() 31{ 32 memset(m_X, 0, 48); 33 memset(m_C, 0, 16); 34 memset(m_buf, 0, 16); 35 m_count = 0; 36} 37 38void MD2::Update(const byte *buf, size_t len) 39{ 40 static const byte S[256] = { 41 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 42 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 43 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 44 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 45 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 46 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 47 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 48 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 49 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 50 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 51 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 52 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 53 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 54 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 55 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, 56 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, 57 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, 58 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 59 }; 60 61 while (len) 62 { 63 unsigned int L = UnsignedMin(16U-m_count, len); 64 memcpy(m_buf+m_count, buf, L); 65 m_count+=L; 66 buf+=L; 67 len-=L; 68 if (m_count==16) 69 { 70 byte t; 71 int i,j; 72 73 m_count=0; 74 memcpy(m_X+16, m_buf, 16); 75 t=m_C[15]; 76 for(i=0; i<16; i++) 77 { 78 m_X[32+i]=m_X[16+i]^m_X[i]; 79 t=m_C[i]^=S[m_buf[i]^t]; 80 } 81 82 t=0; 83 for(i=0; i<18; i++) 84 { 85 for(j=0; j<48; j+=8) 86 { 87 t=m_X[j+0]^=S[t]; 88 t=m_X[j+1]^=S[t]; 89 t=m_X[j+2]^=S[t]; 90 t=m_X[j+3]^=S[t]; 91 t=m_X[j+4]^=S[t]; 92 t=m_X[j+5]^=S[t]; 93 t=m_X[j+6]^=S[t]; 94 t=m_X[j+7]^=S[t]; 95 } 96 t=(t+i) & 0xFF; 97 } 98 } 99 } 100} 101 102void MD2::TruncatedFinal(byte *hash, size_t size) 103{ 104 ThrowIfInvalidTruncatedSize(size); 105 106 byte padding[16]; 107 word32 padlen; 108 unsigned int i; 109 110 padlen= 16-m_count; 111 for(i=0; i<padlen; i++) padding[i]=(byte)padlen; 112 Update(padding, padlen); 113 Update(m_C, 16); 114 memcpy(hash, m_X, size); 115 116 Init(); 117} 118 119} 120NAMESPACE_END 121