aes.h File Reference

AES block cipher, as specified by NIST FIPS 197. More...

#include "beecrypt/beecrypt.h"
#include "beecrypt/aesopt.h"

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Data Structures
struct	aesParam
	Holds all the parameters necessary for the AES cipher. More...

Functions
int	aesSetup (aesParam *ap, const byte *key, size_t keybits, cipherOperation op)
	This function performs the cipher's key expansion.
int	aesSetIV (aesParam *ap, const byte *iv)
	This function sets the Initialization Vector.
int	aesSetCTR (aesParam *ap, const byte *nivz, size_t counter)
	This function sets the CTR mode counter.
int	aesEncrypt (aesParam *ap, uint32_t *dst, const uint32_t *src)
	This function performs the raw AES encryption; it encrypts one block of 128 bits.
int	aesDecrypt (aesParam *ap, uint32_t *dst, const uint32_t *src)
	This function performs the raw AES decryption; it decrypts one block of 128 bits.
uint32_t *	aesFeedback (aesParam *ap)

Variables
const blockCipher	aes
	Holds the full API description of the AES algorithm.

Detailed Description

AES block cipher, as specified by NIST FIPS 197.

Author

Bob Deblier bob.d.nosp@m.ebli.nosp@m.er@te.nosp@m.lene.nosp@m.t.be

Function Documentation

aesDecrypt()

int aesDecrypt	(	aesParam *	ap,
		uint32_t *	dst,
		const uint32_t *	src )

This function performs the raw AES decryption; it decrypts one block of 128 bits.

Parameters

ap	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.

References BEECRYPTAPI.

aesEncrypt()

int aesEncrypt	(	aesParam *	ap,
		uint32_t *	dst,
		const uint32_t *	src )

This function performs the raw AES encryption; it encrypts one block of 128 bits.

Parameters

ap	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.

References BEECRYPTAPI.

aesFeedback()

uint32_t * aesFeedback

(

aesParam *

ap

)

aesSetCTR()

int aesSetCTR	(	aesParam *	ap,
		const byte *	nivz,
		size_t	counter )

This function sets the CTR mode counter.

Note

This function is only useful in CTR modes.

Parameters

ap	The cipher's parameter block.
nivz	The concatenation of Nonce, IV, and padding Zeroes.
counter	The counter.

Return values

0	on success.

References BEECRYPTAPI.

aesSetIV()

int aesSetIV	(	aesParam *	ap,
		const byte *	iv )

This function sets the Initialization Vector.

Note

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

Parameters

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

Return values

0	on success.

References BEECRYPTAPI.

aesSetup()

int aesSetup	(	aesParam *	ap,
		const byte *	key,
		size_t	keybits,
		cipherOperation	op )

This function performs the cipher's key expansion.

Parameters

ap	The cipher's parameter block.
key	The key value.
keybits	The number of bits in the key; legal values are: 128, 192 and 256.
op	ENCRYPT or DECRYPT.

Return values

0	on success.
-1	on failure.

References BEECRYPTAPI.

Variable Documentation

aes

const blockCipher aes

extern

Holds the full API description of the AES algorithm.