Lightweight Cryptography Primitives
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internal-chachapoly.h File Reference

ChaChaPoly implementation for performance comparisons. More...

#include "aead-metadata.h"

Go to the source code of this file.

Macros

#define CHACHAPOLY_KEY_SIZE   32
 Size of the key for ChaChaPoly.
 
#define CHACHAPOLY_NONCE_SIZE   8
 Size of the nonce for ChaChaPoly.
 
#define CHACHAPOLY_TAG_SIZE   16
 Size of the authentication tag for ChaChaPoly.
 

Functions

int internal_chachapoly_aead_encrypt (unsigned char *c, size_t *clen, const unsigned char *m, size_t mlen, const unsigned char *ad, size_t adlen, const unsigned char *npub, const unsigned char *k)
 Encrypts and authenticates a packet with ChaChaPoly. More...
 
int internal_chachapoly_aead_decrypt (unsigned char *m, size_t *mlen, const unsigned char *c, size_t clen, const unsigned char *ad, size_t adlen, const unsigned char *npub, const unsigned char *k)
 Decrypts and authenticates a packet with ChaChaPoly. More...
 

Variables

aead_cipher_t const internal_chachapoly_cipher
 Meta-information block for the ChaChaPoly cipher.
 

Detailed Description

ChaChaPoly implementation for performance comparisons.

ChaChaPoly is not one of the NIST lightweight submissions. We use it as a baseline to evaluate the performance of other ciphers. For example, a performance result of "1.2 ChaChaPolys" means that the algorithm is 1.2 times faster than ChaChaPoly on the same input data on the same hardware.

This ChaChaPoly implementation is based on the one from the Arduino Cryptography Library.

Function Documentation

int internal_chachapoly_aead_decrypt ( unsigned char *  m,
size_t *  mlen,
const unsigned char *  c,
size_t  clen,
const unsigned char *  ad,
size_t  adlen,
const unsigned char *  npub,
const unsigned char *  k 
)

Decrypts and authenticates a packet with ChaChaPoly.

Parameters
mBuffer to receive the plaintext message on output.
mlenReceives the length of the plaintext message on output.
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
chachapoly_aead_encrypt()
int internal_chachapoly_aead_encrypt ( unsigned char *  c,
size_t *  clen,
const unsigned char *  m,
size_t  mlen,
const unsigned char *  ad,
size_t  adlen,
const unsigned char *  npub,
const unsigned char *  k 
)

Encrypts and authenticates a packet with ChaChaPoly.

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.
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
chachapoly_aead_decrypt()