internal-chachapoly.h File Reference

ChaChaPoly implementation for performance comparisons. More...

#include "aead-common.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, 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 ChaChaPoly. More...
int	internal_chachapoly_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 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,
		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 ChaChaPoly.

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

chachapoly_aead_encrypt()

int internal_chachapoly_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 ChaChaPoly.

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

chachapoly_aead_decrypt()