Java密码术创建签名 Java Cryptography加密数据 Java密码术加密数据 Java密码术创建签名 import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.Signature; import java.util.Scanner; public class CreatingDigitalSignature { public static void main(String args[]) throws Exception { //Accepting text from user Scanner sc = new Scanner(System.in); System.out.println("Enter some text"); String msg = sc.nextLine(); //Creating KeyPair generator object KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DSA"); //Initializing the key pair generator keyPairGen.initialize(2048); //Generate the pair of keys KeyPair pair = keyPairGen.generateKeyPair(); //Getting the private key from the key pair PrivateKey privKey = pair.getPrivate(); //Creating a Signature object Signature sign = Signature.getInstance("SHA256withDSA"); //Initialize the signature sign.initSign(privKey); byte[] bytes = "msg".getBytes(); //Adding data to the signature sign.update(bytes); //Calculating the signature byte[] signature = sign.sign(); //Printing the signature System.out.println("Digital signature for given text: "+new String(signature, "UTF8")); } } Java Cryptography加密数据 Java密码术加密数据