tc_ecc_dsa.c File Reference

#include "tc_constants.h"
#include "tc_ecc.h"
#include "tc_ecc_dsa.h"

Functions
static void	bits2int (tc_uECC_word_t *native, const uint8_t *bits, unsigned bits_size, tc_uECC_Curve curve)
int	tc_uECC_sign_with_k (const uint8_t *private_key, const uint8_t *message_hash, unsigned hash_size, tc_uECC_word_t *k, uint8_t *signature, tc_uECC_Curve curve)
int	tc_uECC_sign (const uint8_t *private_key, const uint8_t *message_hash, unsigned hash_size, uint8_t *signature, tc_uECC_Curve curve)
	Generate an ECDSA signature for a given hash value. More...
static bitcount_t	smax (bitcount_t a, bitcount_t b)
int	tc_uECC_verify (const uint8_t *public_key, const uint8_t *message_hash, unsigned hash_size, const uint8_t *signature, tc_uECC_Curve curve)

Variables
static tc_uECC_RNG_Function	g_rng_function = 0

Function Documentation

bits2int()

static void bits2int ( tc_uECC_word_t *  native, const uint8_t *  bits, unsigned  bits_size, tc_uECC_Curve  curve  )

static

smax()

static bitcount_t smax ( bitcount_t  a, bitcount_t  b  )

static

tc_uECC_sign()

int tc_uECC_sign	(	const uint8_t *	p_private_key,
		const uint8_t *	p_message_hash,
		unsigned	p_hash_size,
		uint8_t *	p_signature,
		tc_uECC_Curve	curve
	)

Generate an ECDSA signature for a given hash value.

Returns

returns TC_CRYPTO_SUCCESS (1) if the signature generated successfully returns TC_CRYPTO_FAIL (0) if an error occurred.

Parameters

p_private_key	IN – Your private key.
p_message_hash	IN – The hash of the message to sign.
p_hash_size	IN – The size of p_message_hash in bytes.
p_signature	OUT – Will be filled in with the signature value. Must be at least 2 * curve size long (for secp256r1, signature must be 64 bytes long).

Warning

A cryptographically-secure PRNG function must be set (using tc_uECC_set_rng()) before calling tc_uECC_sign().

Note

Usage: Compute a hash of the data you wish to sign (SHA-2 is recommended) and pass it in to this function along with your private key.

side-channel countermeasure: algorithm strengthened against timing attack.

tc_uECC_sign_with_k()

int tc_uECC_sign_with_k	(	const uint8_t *	private_key,
		const uint8_t *	message_hash,
		unsigned	hash_size,
		tc_uECC_word_t *	k,
		uint8_t *	signature,
		tc_uECC_Curve	curve
	)

tc_uECC_verify()

int tc_uECC_verify	(	const uint8_t *	public_key,
		const uint8_t *	message_hash,
		unsigned	hash_size,
		const uint8_t *	signature,
		tc_uECC_Curve	curve
	)

Variable Documentation

g_rng_function

tc_uECC_RNG_Function g_rng_function = 0

static