com.exonum.binding.crypto

Interface CryptoFunction

All Known Implementing Classes:

Ed25519CryptoFunction

public interface CryptoFunction

A crypto function that provides several signature system crypto methods.

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