include/beecrypt/blowfish.h File Reference

Blowfish block cipher. More...

#include "beecrypt/beecrypt.h"
#include "beecrypt/blowfishopt.h"

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Data Structures
struct	blowfishParam
	Holds all the parameters necessary for the Blowfish cipher. More...
Defines
#define	BLOWFISHROUNDS   16
#define	BLOWFISHPSIZE   (BLOWFISHROUNDS+2)
Functions
int	blowfishSetup (blowfishParam *, const byte *, size_t, cipherOperation)
	The function performs the cipher's key expansion.
int	blowfishSetIV (blowfishParam *, const byte *iv)
	This function sets the Initialization Vector.
int	blowfishSetCTR (blowfishParam *, const byte *nivz, size_t counter)
int	blowfishEncrypt (blowfishParam *, uint32_t *, const uint32_t *)
	This function performs the Blowfish encryption; it encrypts one block of 64 bits.
int	blowfishDecrypt (blowfishParam *, uint32_t *, const uint32_t *)
	This function performs the Blowfish decryption; it Rderypts one block of 64 bits.
uint32_t *	blowfishFeedback (blowfishParam *)
Variables
const blockCipher	blowfish
	Holds the full API description of the Blowfish algorithm.

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Detailed Description

Blowfish block cipher.

For more information on this blockcipher, see: "Applied Cryptography", second edition Bruce Schneier Wiley & Sons

Also see http://www.counterpane.com/blowfish.html

Author:

Bob Deblier <bob.deblier@telenet.be>

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Define Documentation

#define BLOWFISHPSIZE   (BLOWFISHROUNDS+2)

#define BLOWFISHROUNDS   16

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Function Documentation

blowfishDecrypt	(	blowfishParam *	bp,
		uint32_t *	dst,
		const uint32_t *	src
	)

This function performs the Blowfish decryption; it Rderypts one block of 64 bits.

Parameters:

	bp	The cipher's parameter block.
	dst	The cleartext; should be aligned on 32-bit boundary.
	src	The ciphertext; should be aligned on 32-bit boundary.

Return values:

0

on success.

blowfishEncrypt	(	blowfishParam *	bp,
		uint32_t *	dst,
		const uint32_t *	src
	)

This function performs the Blowfish encryption; it encrypts one block of 64 bits.

Parameters:

	bp	The cipher's parameter block.
	dst	The ciphertext; should be aligned on 32-bit boundary.
	src	The cleartext; should be aligned on 32-bit boundary.

Return values:

0

on success.

uint32_t* blowfishFeedback

(

blowfishParam *

)

int blowfishSetCTR	(	blowfishParam *	,
		const byte *	nivz,
		size_t	counter
	)

int blowfishSetIV	(	blowfishParam *	bp,
		const byte *	iv
	)

This function sets the Initialization Vector.

Note:

This function is only useful in block chaining or feedback modes.

Parameters:

	bp	The cipher's parameter block.
	iv	The initialization vector; may be null.

Return values:

0

on success.

int blowfishSetup	(	blowfishParam *	bp,
		const byte *	key,
		size_t	keybits,
		cipherOperation	op
	)

The function performs the cipher's key expansion.

Parameters:

	bp	The cipher's parameter block.
	key	The key value.
	keybits	The number of bits in the key; legal values are: 32 to 448, in multiples of 8.
	op	ENCRYPT or DECRYPT.

Return values:

	0	on success.
	-1	on failure.

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Variable Documentation

blowfish

Holds the full API description of the Blowfish algorithm.