ecdsa算法 Java使用_java – 使用secp256r1曲线和SHA256算法生成ECDSA签名 – BouncyCastle...

我正在尝试使用带有secp256r1曲线(P256)的ECDSA和用于消息散列的SHA256算法生成签名.我也在使用Bouncy Castle图书馆.

代码如下,

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();

}

}

}

这里使用KeyPair生成密钥对,但根据我的要求,我将使用静态privateKey和公钥.此外,签名验证始终返回false.

需要帮助,我如何拥有静态私钥和验证部分.