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grain128.h File Reference

Grain-128AEAD authenticated encryption algorithm. More...

#include "aead-common.h"

Go to the source code of this file.

Macros

#define GRAIN128_KEY_SIZE   16
 Size of the key for Grain-128AEAD.
 
#define GRAIN128_TAG_SIZE   8
 Size of the authentication tag for Grain-128AEAD.
 
#define GRAIN128_NONCE_SIZE   12
 Size of the nonce for Grain-128AEAD.
 

Functions

int grain128_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 Grain-128AEAD. More...
 
int grain128_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 Grain-128AEAD. More...
 

Variables

aead_cipher_t const grain128_aead_cipher
 Meta-information block for the Grain-128AEAD cipher.
 

Detailed Description

Grain-128AEAD authenticated encryption algorithm.

Grain-128AEAD is an authenticated encryption algorithm based around a combination of a 128-bit linear feedback shift register (LFSR) and a 128-bit non-linear feedback shift register (NFSR). It is a member of the Grain family of stream ciphers.

References: https://grain-128aead.github.io/

Function Documentation

int grain128_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 Grain-128AEAD.

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 8 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 12 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
grain128_aead_encrypt()
int grain128_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 Grain-128AEAD.

Parameters
cBuffer to receive the output.
clenOn exit, set to the length of the output which includes the ciphertext and the 8 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 12 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
grain128_aead_decrypt()