blowfish::core Namespace Reference

Low-level utilities - for advanced users only. More...


Functions
uint32	F (Pad const &pad, uint32 u)
	The base scrambling function of Blowfish, using the S boxes.
Block	encipherBlock (Pad const &pad, Block const &block)
Block	decipherBlock (Pad const &pad, Block const &block)
	Standard sixteen round deciphering of block using pad.
Variables
Pad const	defaultPiPad
	default pad based on the decimals of pi

Detailed Description

Low-level utilities - for advanced users only.

Function Documentation

Block blowfish::core::decipherBlock	(	Pad const &	pad,
		Block const &	block
	)

Standard sixteen round deciphering of block using pad.

swapped L and R !

Definition at line 406 of file blowfish.cpp.

00407 {
00408     uint32 L = block.L;
00409     uint32 R = block.R;
00410     L ^= pad.P[17];
00411     R ^= F(pad,L)^pad.P[16]; L ^= F(pad,R)^pad.P[15];
00412     R ^= F(pad,L)^pad.P[14]; L ^= F(pad,R)^pad.P[13];
00413     R ^= F(pad,L)^pad.P[12]; L ^= F(pad,R)^pad.P[11];
00414     R ^= F(pad,L)^pad.P[10]; L ^= F(pad,R)^pad.P[9];
00415     R ^= F(pad,L)^pad.P[8];  L ^= F(pad,R)^pad.P[7];
00416     R ^= F(pad,L)^pad.P[6];  L ^= F(pad,R)^pad.P[5];
00417     R ^= F(pad,L)^pad.P[4];  L ^= F(pad,R)^pad.P[3];
00418     R ^= F(pad,L)^pad.P[2];  L ^= F(pad,R)^pad.P[1];
00419     R ^= pad.P[0];
00420    return Block( R, L ); //! swapped L and R !
00421 }

Block blowfish::core::encipherBlock	(	Pad const &	pad,
		Block const &	block
	)

Standard sixteen round enciphering of block using pad. Initial and final x-oring of the data ( = whitening ) helps prevent some attacks.

swapping L and R one more time... !

Definition at line 387 of file blowfish.cpp.

00388 {
00389     uint32 L = block.L;
00390     uint32 R = block.R;
00391     L ^= pad.P[0];
00392     R ^= F(pad,L)^pad.P[1];  L ^= F(pad,R)^pad.P[2];
00393     R ^= F(pad,L)^pad.P[3];  L ^= F(pad,R)^pad.P[4];
00394     R ^= F(pad,L)^pad.P[5];  L ^= F(pad,R)^pad.P[6];
00395     R ^= F(pad,L)^pad.P[7];  L ^= F(pad,R)^pad.P[8];
00396     R ^= F(pad,L)^pad.P[9];  L ^= F(pad,R)^pad.P[10];
00397     R ^= F(pad,L)^pad.P[11]; L ^= F(pad,R)^pad.P[12];
00398     R ^= F(pad,L)^pad.P[13]; L ^= F(pad,R)^pad.P[14];
00399     R ^= F(pad,L)^pad.P[15]; L ^= F(pad,R)^pad.P[16];
00400     R ^= pad.P[17];
00401    return Block( R, L ); //! swapping L and R one more time... !
00402 }

uint32 blowfish::core::F	(	Pad const &	pad,
		uint32	u
	)			`[inline]`

The base scrambling function of Blowfish, using the S boxes.

Definition at line 373 of file blowfish.cpp.

00374 {
00375    uint8 const a = uint8(u>>24);
00376    uint8 const b = uint8(u>>16);
00377    uint8 const c = uint8(u>> 8);
00378    uint8 const d = uint8(u    );
00379 
00380    return (  ( pad.S[0][a] + pad.S[1][b] )  ^  pad.S[2][c]  )  +  pad.S[3][d];
00381 }

Variable Documentation

Pad const blowfish::core::defaultPiPad

default pad based on the decimals of pi

The standard initial pad used for Blowfish. This pad is made out of the decimals of PI (calculated in binary). The pad will be scrambled based on the provided password.

Definition at line 27 of file blowfish.cpp.

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Documentation

blowfish::core Namespace Reference

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation