100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
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// blowfish.cpp - written and placed in the public domain by Wei Dai
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#include "pch.h"
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#include "blowfish.h"
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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void Blowfish::Base::UncheckedSetKey(const byte *key_string, unsigned int keylength, const NameValuePairs &)
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{
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AssertValidKeyLength(keylength);
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unsigned i, j=0, k;
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word32 data, dspace[2] = {0, 0};
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memcpy(pbox, p_init, sizeof(p_init));
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memcpy(sbox, s_init, sizeof(s_init));
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// Xor key string into encryption key vector
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for (i=0 ; i<ROUNDS+2 ; ++i)
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{
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data = 0 ;
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for (k=0 ; k<4 ; ++k )
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data = (data << 8) | key_string[j++ % keylength];
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pbox[i] ^= data;
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}
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crypt_block(dspace, pbox);
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for (i=0; i<ROUNDS; i+=2)
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crypt_block(pbox+i, pbox+i+2);
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crypt_block(pbox+ROUNDS, sbox);
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for (i=0; i<4*256-2; i+=2)
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crypt_block(sbox+i, sbox+i+2);
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if (!IsForwardTransformation())
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for (i=0; i<(ROUNDS+2)/2; i++)
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std::swap(pbox[i], pbox[ROUNDS+1-i]);
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}
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// this version is only used to make pbox and sbox
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void Blowfish::Base::crypt_block(const word32 in[2], word32 out[2]) const
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{
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word32 left = in[0];
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word32 right = in[1];
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const word32 *const s=sbox;
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const word32 *p=pbox;
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left ^= p[0];
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for (unsigned i=0; i<ROUNDS/2; i++)
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{
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right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
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^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
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^ p[2*i+1];
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left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
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^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
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^ p[2*i+2];
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}
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right ^= p[ROUNDS+1];
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out[0] = right;
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out[1] = left;
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}
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void Blowfish::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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typedef BlockGetAndPut<word32, BigEndian> Block;
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word32 left, right;
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Block::Get(inBlock)(left)(right);
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const word32 *const s=sbox;
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const word32 *p=pbox;
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left ^= p[0];
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for (unsigned i=0; i<ROUNDS/2; i++)
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{
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right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
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^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
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^ p[2*i+1];
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left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
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^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
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^ p[2*i+2];
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}
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right ^= p[ROUNDS+1];
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Block::Put(xorBlock, outBlock)(right)(left);
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}
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NAMESPACE_END
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