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-rw-r--r--CryptoPP/blowfish.cpp99
1 files changed, 99 insertions, 0 deletions
diff --git a/CryptoPP/blowfish.cpp b/CryptoPP/blowfish.cpp
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+++ b/CryptoPP/blowfish.cpp
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+// blowfish.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "blowfish.h"
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void Blowfish::Base::UncheckedSetKey(const byte *key_string, unsigned int keylength, const NameValuePairs &)
+{
+ AssertValidKeyLength(keylength);
+
+ unsigned i, j=0, k;
+ word32 data, dspace[2] = {0, 0};
+
+ memcpy(pbox, p_init, sizeof(p_init));
+ memcpy(sbox, s_init, sizeof(s_init));
+
+ // Xor key string into encryption key vector
+ for (i=0 ; i<ROUNDS+2 ; ++i)
+ {
+ data = 0 ;
+ for (k=0 ; k<4 ; ++k )
+ data = (data << 8) | key_string[j++ % keylength];
+ pbox[i] ^= data;
+ }
+
+ crypt_block(dspace, pbox);
+
+ for (i=0; i<ROUNDS; i+=2)
+ crypt_block(pbox+i, pbox+i+2);
+
+ crypt_block(pbox+ROUNDS, sbox);
+
+ for (i=0; i<4*256-2; i+=2)
+ crypt_block(sbox+i, sbox+i+2);
+
+ if (!IsForwardTransformation())
+ for (i=0; i<(ROUNDS+2)/2; i++)
+ std::swap(pbox[i], pbox[ROUNDS+1-i]);
+}
+
+// this version is only used to make pbox and sbox
+void Blowfish::Base::crypt_block(const word32 in[2], word32 out[2]) const
+{
+ word32 left = in[0];
+ word32 right = in[1];
+
+ const word32 *const s=sbox;
+ const word32 *p=pbox;
+
+ left ^= p[0];
+
+ for (unsigned i=0; i<ROUNDS/2; i++)
+ {
+ right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
+ ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
+ ^ p[2*i+1];
+
+ left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
+ ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
+ ^ p[2*i+2];
+ }
+
+ right ^= p[ROUNDS+1];
+
+ out[0] = right;
+ out[1] = left;
+}
+
+void Blowfish::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ typedef BlockGetAndPut<word32, BigEndian> Block;
+
+ word32 left, right;
+ Block::Get(inBlock)(left)(right);
+
+ const word32 *const s=sbox;
+ const word32 *p=pbox;
+
+ left ^= p[0];
+
+ for (unsigned i=0; i<ROUNDS/2; i++)
+ {
+ right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
+ ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
+ ^ p[2*i+1];
+
+ left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
+ ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
+ ^ p[2*i+2];
+ }
+
+ right ^= p[ROUNDS+1];
+
+ Block::Put(xorBlock, outBlock)(right)(left);
+}
+
+NAMESPACE_END