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cryptopp-cmake/blowfish.cpp at master · 0Knowledge/cryptopp-cmake · GitHub
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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
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