#include "include/secp256k1_ecdh.h"
#include "ecmult_const_impl.h"

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Functions
static int	ecdh_hash_function_sha256 (unsigned char output, const unsigned char x32, const unsigned char y32, void data)

int	secp256k1_ecdh (const secp256k1_context ctx, unsigned char output, const secp256k1_pubkey point, const unsigned char scalar, secp256k1_ecdh_hash_function hashfp, void *data)
	Compute an EC Diffie-Hellman secret in constant time.

Variables
const secp256k1_ecdh_hash_function	secp256k1_ecdh_hash_function_sha256 = ecdh_hash_function_sha256
	An implementation of SHA256 hash function that applies to compressed public key.

const secp256k1_ecdh_hash_function	secp256k1_ecdh_hash_function_default = ecdh_hash_function_sha256
	A default ECDH hash function (currently equal to secp256k1_ecdh_hash_function_sha256).

Function Documentation

◆ ecdh_hash_function_sha256()

static int ecdh_hash_function_sha256	(	unsigned char *	output,
		const unsigned char *	x32,
		const unsigned char *	y32,
		void *	data
	)

static

Definition at line 13 of file main_impl.h.

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◆ secp256k1_ecdh()

int secp256k1_ecdh	(	const secp256k1_context *	ctx,
		unsigned char *	output,
		const secp256k1_pubkey *	pubkey,
		const unsigned char *	seckey,
		secp256k1_ecdh_hash_function	hashfp,
		void *	data
	)

Compute an EC Diffie-Hellman secret in constant time.

Returns: 1: exponentiation was successful 0: scalar was invalid (zero or overflow) or hashfp returned 0 Args: ctx: pointer to a context object (cannot be NULL) Out: output: pointer to an array to be filled by hashfp In: pubkey: a pointer to a secp256k1_pubkey containing an initialized public key seckey: a 32-byte scalar with which to multiply the point hashfp: pointer to a hash function. If NULL, secp256k1_ecdh_hash_function_sha256 is used (in which case, 32 bytes will be written to output) data: arbitrary data pointer that is passed through to hashfp

Definition at line 29 of file main_impl.h.

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Variable Documentation

◆ secp256k1_ecdh_hash_function_default

const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_default = ecdh_hash_function_sha256

A default ECDH hash function (currently equal to secp256k1_ecdh_hash_function_sha256).

Populates the output parameter with 32 bytes.

Definition at line 27 of file main_impl.h.

◆ secp256k1_ecdh_hash_function_sha256

const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_sha256 = ecdh_hash_function_sha256

An implementation of SHA256 hash function that applies to compressed public key.