Generate Public Key From Private Key Ecdsa Encryption Java

Posted : admin On 17.12.2020

Oct 04, 2019 ECDSA with secp256k1 in Java: generate ECC keys, sign, verify - ECDSA-secp256k1-example.java. Sep 11, 2012 This site uses cookies for analytics, personalized content and ads. Chrome 4.0 mac download. By continuing to browse this site, you agree to this use.

Generate Private And Public Key
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ECDSA with secp256k1 in Java: generate ECC keys, sign, verify

ECDSA-secp256k1-example.java

importorg.bouncycastle.util.encoders.Hex;

importorg.web3j.crypto.*;

importjava.math.BigInteger;

publicclassECCExample {

publicstaticStringcompressPubKey(BigIntegerpubKey) {

String pubKeyYPrefix = pubKey.testBit(0) ?'03':'02';

String pubKeyHex = pubKey.toString(16);

String pubKeyX = pubKeyHex.substring(0, 64);

return pubKeyYPrefix + pubKeyX;

}

publicstaticvoidmain(String[] args) throwsException {

//BigInteger privKey = Keys.createEcKeyPair().getPrivateKey();

BigInteger privKey =newBigInteger('97ddae0f3a25b92268175400149d65d6887b9cefaf28ea2c078e05cdc15a3c0a', 16);

BigInteger pubKey =Sign.publicKeyFromPrivate(privKey);

ECKeyPair keyPair =newECKeyPair(privKey, pubKey);

System.out.println('Private key: '+ privKey.toString(16));

System.out.println('Public key: '+ pubKey.toString(16));

System.out.println('Public key (compressed): '+ compressPubKey(pubKey));

String msg ='Message for signing';

byte[] msgHash =Hash.sha3(msg.getBytes());

Sign.SignatureData signature =Sign.signMessage(msgHash, keyPair, false);

System.out.println('Msg: '+ msg);

System.out.println('Msg hash: '+Hex.toHexString(msgHash));

System.out.printf('Signature: [v = %d, r = %s, s = %s]n',

signature.getV() -27,

Hex.toHexString(signature.getR()),

Hex.toHexString(signature.getS()));

System.out.println();

BigInteger pubKeyRecovered =Sign.signedMessageToKey(msg.getBytes(), signature);

System.out.println('Recovered public key: '+ pubKeyRecovered.toString(16));

boolean validSig = pubKey.equals(pubKeyRecovered);

System.out.println('Signature valid? '+ validSig);

}

pom.xml

<?xml version='1.0' encoding='UTF-8'?>

<projectxmlns='http://maven.apache.org/POM/4.0.0'

xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'

xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd'>

<groupId>bc-examples</groupId>

<artifactId>bc-examples</artifactId>

<version>1.0-SNAPSHOT</version>

<artifactId>crypto</artifactId>

</dependency>

</dependencies>

</project>

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