求ECDSA的Java代碼

方案1

package ECDSA;

import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin;

import java.security.*;

import java.security.interfaces.ECPrivateKey;

import java.security.interfaces.ECPublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

public class Ecdsa {

private static String src = "hello berber" ;

public static void main(String []args){

jdkECDSA();

}

public static void jdkECDSA(){

// 1.初始化密鑰

try{

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");

keyPairGenerator.initialize(256);

KeyPair keyPair = keyPairGenerator.generateKeyPair() ;

ECPublicKey ecPublicKey = (ECPublicKey)keyPair.getPublic() ;

ECPrivateKey ecPrivateKey = (ECPrivateKey)keyPair.getPrivate() ;

// 執行簽名

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 []arr = signature.sign();

System.out.println("jdk ecdsa sign :"+ HexBin.encode(arr));

// 驗證簽名

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(arr);

System.out.println("jdk ecdsa verify:"+bool);

}catch(Exception e){

}

}

}

Java數字簽名——ECDSA算法

方案2

public class MyTest {

/**

* @param args

*/

public static void main(String[] args) {

new MyTest().getSign();

}

void getSign() {

// Get the instance of the Key Generator with "EC" algorithm

try {

KeyPairGenerator g = KeyPairGenerator.getInstance("EC");

ECGenParameterSpec kpgparams = new ECGenParameterSpec("secp256r1");

g.initialize(kpgparams);

KeyPair pair = g.generateKeyPair();

// Instance of signature class with SHA256withECDSA algorithm

Signature ecdsaSign = Signature.getInstance("SHA256withECDSA");

ecdsaSign.initSign(pair.getPrivate());

System.out.println("Private Keys is::" + pair.getPrivate());

System.out.println("Public Keys is::" + pair.getPublic());

String msg = "text ecdsa with sha256";//getSHA256(msg)

ecdsaSign.update((msg + pair.getPrivate().toString())

.getBytes("UTF-8"));

byte[] signature = ecdsaSign.sign();

System.out.println("Signature is::"

+ new BigInteger(1, signature).toString(16));

// Validation

ecdsaSign.initVerify(pair.getPublic());

ecdsaSign.update(signature);

if (ecdsaSign.verify(signature))

System.out.println("valid");

else

System.out.println("invalid!!!!");

} catch (Exception e) {

// TODO: handle exception

e.printStackTrace();

}

}}

java – 使用secp256r1曲線和SHA256算法生

怎麽驗證生成的Ecdsa簽名是正確的呢，可以看下這篇文章:RSA,ECC,Ecdsa,國密SM2的簽名，驗簽，加密