gift-cofb.h File Reference

GIFT-COFB authenticated encryption algorithm. More...

#include "aead-common.h"

Go to the source code of this file.

Macros
#define	GIFT_COFB_KEY_SIZE   16
	Size of the key for GIFT-COFB.
#define	GIFT_COFB_TAG_SIZE   16
	Size of the authentication tag for all GIFT-COFB family members.
#define	GIFT_COFB_NONCE_SIZE   16
	Size of the nonce for GIFT-COFB.

Functions
int	gift_cofb_aead_encrypt (unsigned char *c, unsigned long long *clen, const unsigned char *m, unsigned long long mlen, const unsigned char *ad, unsigned long long adlen, const unsigned char *nsec, const unsigned char *npub, const unsigned char *k)
	Encrypts and authenticates a packet with GIFT-COFB. More...
int	gift_cofb_aead_decrypt (unsigned char *m, unsigned long long *mlen, unsigned char *nsec, const unsigned char *c, unsigned long long clen, const unsigned char *ad, unsigned long long adlen, const unsigned char *npub, const unsigned char *k)
	Decrypts and authenticates a packet with GIFT-COFB-0. More...

Variables
aead_cipher_t const	gift_cofb_cipher
	Meta-information block for the GIFT-COFB cipher.

Detailed Description

GIFT-COFB authenticated encryption algorithm.

GIFT-COFB is an authenticated encryption algorithm that combines the COFB (COmbined FeedBack) block cipher mode with the GIFT-128 block cipher. The algorithm has a 128-bit key, a 128-bit nonce, and a 128-bit authentication tag.

References: https://www.isical.ac.in/~lightweight/COFB/

Function Documentation

int gift_cofb_aead_decrypt	(	unsigned char *	m,
		unsigned long long *	mlen,
		unsigned char *	nsec,
		const unsigned char *	c,
		unsigned long long	clen,
		const unsigned char *	ad,
		unsigned long long	adlen,
		const unsigned char *	npub,
		const unsigned char *	k
	)

Decrypts and authenticates a packet with GIFT-COFB-0.

Parameters

m	Buffer to receive the plaintext message on output.
mlen	Receives the length of the plaintext message on output.
nsec	Secret nonce - not used by this algorithm.
c	Buffer that contains the ciphertext and authentication tag to decrypt.
clen	Length of the input data in bytes, which includes the ciphertext and the 16 byte authentication tag.
ad	Buffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlen	Length of the associated data in bytes.
npub	Points to the public nonce for the packet which must be 16 bytes in length.
k	Points to the 16 bytes of the key to use to decrypt the packet.

Returns

0 on success, -1 if the authentication tag was incorrect, or some other negative number if there was an error in the parameters.

See Also

gift_cofb_aead_encrypt()

int gift_cofb_aead_encrypt	(	unsigned char *	c,
		unsigned long long *	clen,
		const unsigned char *	m,
		unsigned long long	mlen,
		const unsigned char *	ad,
		unsigned long long	adlen,
		const unsigned char *	nsec,
		const unsigned char *	npub,
		const unsigned char *	k
	)

Encrypts and authenticates a packet with GIFT-COFB.

Parameters

c	Buffer to receive the output.
clen	On exit, set to the length of the output which includes the ciphertext and the 16 byte authentication tag.
m	Buffer that contains the plaintext message to encrypt.
mlen	Length of the plaintext message in bytes.
ad	Buffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlen	Length of the associated data in bytes.
nsec	Secret nonce - not used by this algorithm.
npub	Points to the public nonce for the packet which must be 16 bytes in length.
k	Points to the 16 bytes of the key to use to encrypt the packet.

Returns

0 on success, or a negative value if there was an error in the parameters.

See Also

gift_cofb_aead_decrypt()