Lightweight Cryptography Primitives
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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
mBuffer to receive the plaintext message on output.
mlenReceives the length of the plaintext message on output.
nsecSecret nonce - not used by this algorithm.
cBuffer that contains the ciphertext and authentication tag to decrypt.
clenLength of the input data in bytes, which includes the ciphertext and the 16 byte authentication tag.
adBuffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlenLength of the associated data in bytes.
npubPoints to the public nonce for the packet which must be 16 bytes in length.
kPoints 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
cBuffer to receive the output.
clenOn exit, set to the length of the output which includes the ciphertext and the 16 byte authentication tag.
mBuffer that contains the plaintext message to encrypt.
mlenLength of the plaintext message in bytes.
adBuffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlenLength of the associated data in bytes.
nsecSecret nonce - not used by this algorithm.
npubPoints to the public nonce for the packet which must be 16 bytes in length.
kPoints 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()