数字签名算法ECDSA

import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.asn1.eac.ECDSAPublicKey;

import java.security.*;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
* Created by pengchao on 2017/10/19.
*/
public class ImoocECDSA {
private static String src ="imooc security ecdsa";
public static void  main(String[] args) {
jdkDSA();
}
public static void  jdkDSA(){
try {
//初始化密钥
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
keyPairGenerator.initialize(256);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
ECPublicKey ecPublicKey = (ECPublicKey) keyPair.getPublic();
ECPrivateKey ecPrivateKey = (ECPrivateKey) keyPair.getPrivate();

//2.执行签名
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());
KeyFactory keyFactory = KeyFactory.getInstance("EC");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Signature signature = Signature.getInstance("SHA1withECDSA");
signature.initSign(privateKey);
signature.update(src.getBytes());
byte[] bytes = signature.sign();
System.out.println("jdk ecdsa sign:" + Hex.encodeHexString(bytes));

//3.验证签名
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(ecPublicKey.getEncoded());
keyFactory = KeyFactory.getInstance("EC");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
signature = Signature.getInstance("SHA1withECDSA");
signature.initVerify(publicKey);
signature.update(src.getBytes());
boolean bool = signature.verify(bytes);
System.out.println("jdk ecdsa verify :" + bool);
} catch (Exception e) {
e.printStackTrace();
}

}
}