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Utils for compressing public key.

Import necessary classes from the Web3j and kaia libraries(web3j-ext)

For convert from compressed public key to an AccountPublicKey with {x, y} format, use AccountKeyPublicUtils.decompressKey

For compressing AccountKeyPublic to compressed public key string, uses AccountKeyPublicUtils.toCompressedPublicKey

PublicKeyUtilsExample.java

package org.web3j.example.utils;

import org.web3j.crypto.transaction.account.AccountKeyPublic;

import org.web3j.utils.AccountKeyPublicUtils;

public class PublicKeyUtilsExample {

public static void main(String[] args) {

System.out.println("From compressed public key to AccountKeyPublic");

System.out.println(AccountKeyPublicUtils.decompressKey("03dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd"));

System.out.println("From x,y to compressed public key");

AccountKeyPublic publicKey= AccountKeyPublic.create("0xdc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd","0xaf06ca34ae8714cf3dae06bacdb78c7c2d4054bd38961d40853cd5f15955da79");

System.out.println(AccountKeyPublicUtils.toCompressedPublicKey(publicKey.getPublicKey()));

}

}

output

❯ java PublicKeyUtilsExample.java

From compressed public key to AccountKeyPublic

AccountKeyPublic x : 0xdc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd / y : 0xaf06ca34ae8714cf3dae06bacdb78c7c2d4054bd38961d40853cd5f15955da79

From x,y to compressed public key

03dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd