Generate Ecc Key Pair Android
Oct 04, 2019 ECDSA with secp256k1 in Java: generate ECC keys, sign, verify - ECDSA-secp256k1-example.java. How to generate RSA and EC keys with OpenSSL. desktop clock free download mac How to generate keys in PEM format using the OpenSSL command line tools? The JOSE standard recommends a minimum RSA key size of 2048 bits. /quickbook-pro-2017-serial-key-generator-setup.html. To generate a 2048-bit RSA private + public key pair for use in RSxxx and PSxxx signatures.
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| Demonstrates how to generate an ECC key and save both public and private parts.
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© 2000-2020 Chilkat Software, Inc. All Rights Reserved.
| 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); |
| } |
| } |
| <?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: |
commented Sep 16, 2018
java.security package contains ECDSA classes for generating the key pair, signing and verifying signatures. |