- Java Generate Ecc Key Pair Key
- Generate Ec Key Pair Java
- Generate Ecc Key Pair
- Generate Ecc Key Pair Java
- Java Generate Ecc Key Pair Key
Apr 30, 2015 The following code is the ALgorithm of ECC Sample Code in JavaCard API Specification. Generate ECC key pair and store in the global variable 'eccKey' private void GenEccKeyPair(APDU apdu, short len). The offset from 128 to 255 positions stored ECC public key, including 128 to 129 store the public key length, 130 to 255 store the private.
ECDSA with secp256k1 in Java: generate ECC keys, sign, verify
ECDSA-secp256k1-example.java
Java Generate Ecc Key Pair Key
| 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'> |
| <modelVersion>4.0.0</modelVersion> |
| <groupId>bc-examples</groupId> |
| <artifactId>bc-examples</artifactId> |
| <version>1.0-SNAPSHOT</version> |
| <dependencies> |
| <dependency> |
| <groupId>org.web3j</groupId> |
| <artifactId>crypto</artifactId> |
| <version>3.3.1</version> |
| </dependency> |
| </dependencies> |
| </project> |
commented Apr 5, 2018
The expected output is as follows: |
Generate Ec Key Pair Java
commented Sep 16, 2018
java.security package contains ECDSA classes for generating the key pair, signing and verifying signatures. |
Generate Ecc Key Pair
Generate Ecc Key Pair Java
Java Generate Ecc Key Pair Key
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment