djn.cpp File Reference

A library implementing the Damgaard Jurik Nielsen cryptosystem with s=1 (Same properties as Paillier, but more efficient). based on:
libdjn - A library implementing the Paillier cryptosystem. (http://hms.isi.jhu.edu/acsc/libdjn/) More...

#include "djn.h"

Include dependency graph for djn.cpp:

Macros
#define	DEBUG   0
#define	CHECKSIZE   0

Functions
void	djn_complete_pubkey (unsigned int modulusbits, djn_pubkey_t **pub, mpz_t n, mpz_t h)
void	djn_keygen (unsigned int modulusbits, djn_pubkey_t **pub, djn_prvkey_t **prv)
void	djn_encrypt (mpz_t res, djn_pubkey_t *pub, mpz_t plaintext, gmp_randstate_t rnd)
void	djn_encrypt_crt (mpz_t res, djn_pubkey_t *pub, djn_prvkey_t *prv, mpz_t plaintext, gmp_randstate_t rnd)
void	djn_encrypt_fb (mpz_t res, djn_pubkey_t *pub, mpz_t plaintext, gmp_randstate_t rnd)
void	djn_decrypt (mpz_t res, djn_pubkey_t *pub, djn_prvkey_t *prv, mpz_t ciphertext)
void	djn_decrypt_plain (mpz_t res, djn_pubkey_t *pub, djn_prvkey_t *prv, mpz_t ciphertext)
void	djn_freepubkey (djn_pubkey_t *pub)
void	djn_freeprvkey (djn_prvkey_t *prv)
void	djn_pow_mod_n_crt (mpz_t res, const mpz_t base, const mpz_t exp, const djn_pubkey_t *pub, const djn_prvkey_t *prv)
void	djn_pow_mod_n_squared_crt (mpz_t res, const mpz_t base, const mpz_t exp, const djn_pubkey_t *pub, const djn_prvkey_t *prv)

Detailed Description

A library implementing the Damgaard Jurik Nielsen cryptosystem with s=1 (Same properties as Paillier, but more efficient). based on:
libdjn - A library implementing the Paillier cryptosystem. (http://hms.isi.jhu.edu/acsc/libdjn/)

Author

Daniel Demmler

Copyright

Copyright (C) 2015 EC SPRIDE - danie.nosp@m.l.de.nosp@m.mmler.nosp@m.@ec-.nosp@m.sprid.nosp@m.e.de

Function Documentation

void djn_complete_pubkey	(	unsigned int	modulusbits,
		djn_pubkey_t **	pub,
		mpz_t	n,
		mpz_t	h
	)

create full public key given only n and h (e.g., after a key exchange)

void djn_decrypt	(	mpz_t	res,
		djn_pubkey_t *	pub,
		djn_prvkey_t *	prv,
		mpz_t	ciphertext
	)

decrypt, using CRT, assumes res to be initialized

void djn_decrypt_plain	(	mpz_t	res,
		djn_pubkey_t *	pub,
		djn_prvkey_t *	prv,
		mpz_t	ciphertext
	)

plain decrypt version without crt (= much slower), assumes res to be initialized

void djn_encrypt	(	mpz_t	res,
		djn_pubkey_t *	pub,
		mpz_t	plaintext,
		gmp_randstate_t	rnd
	)

encrypt plaintext to res

void djn_encrypt_crt	(	mpz_t	res,
		djn_pubkey_t *	pub,
		djn_prvkey_t *	prv,
		mpz_t	plaintext,
		gmp_randstate_t	rnd
	)

encrypt plaintext using crt if private key is known

void djn_encrypt_fb	(	mpz_t	res,
		djn_pubkey_t *	pub,
		mpz_t	plaintext,
		gmp_randstate_t	rnd
	)

mpz_t version of encrypt_crt