com.exonum.binding.common.crypto

Interface CryptoFunction

All Known Implementing Classes:

Ed25519CryptoFunction

public interface CryptoFunction

A crypto function that provides several signature system crypto methods. All method arguments can't be null otherwise NullPointerException will be thrown.

Method Summary

Modifier and Type	Method and Description
KeyPair	generateKeyPair() Generates a private key and a corresponding public key using a random seed.
KeyPair	generateKeyPair(byte[] seed) Generates a private key and a corresponding public key using a seed byte array.
byte[]	signMessage(byte[] message, PrivateKey privateKey) Given a privateKey, computes and returns a signature for the supplied message.
boolean	verify(byte[] message, byte[] signature, PublicKey publicKey) Given a publicKey, verifies that signature is a valid signature for the supplied message.

Method Detail

generateKeyPair

KeyPair generateKeyPair(byte[] seed)

Generates a private key and a corresponding public key using a seed byte array.

Throws:

java.lang.IllegalArgumentException - if the specified seed is not valid

generateKeyPair

KeyPair generateKeyPair()

Generates a private key and a corresponding public key using a random seed.

signMessage

byte[] signMessage(byte[] message,
                   PrivateKey privateKey)

Given a privateKey, computes and returns a signature for the supplied message.

Returns:

signature as a byte array

Throws:

java.lang.IllegalArgumentException - if the private key is not valid for this cryptographic function

verify

boolean verify(byte[] message,
               byte[] signature,
               PublicKey publicKey)

Given a publicKey, verifies that signature is a valid signature for the supplied message.

Returns:

true if signature is valid, false otherwise