Java数字签名——DSA算法
RSA数字加密算法参考:http://www.cnblogs.com/LexMoon/p/javaRSA.html
DSS: 数字签名标准
DSA: 数字签名算法
DSA仅仅包含数字签名
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密钥长度均为512~1024(64的整数倍),默认长度为1024
实现方JDK:
SHA1withDSA
实现方BD:
SHA224withDSA
SHA256withDSA
SHA384withDSA
SHA512withDSA
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1 package DSA;2
3 import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin;
4
5 import java.security.*;
6 import java.security.interfaces.DSAPrivateKey;
7 import java.security.interfaces.DSAPublicKey;
8 import java.security.spec.PKCS8EncodedKeySpec;
9 import java.security.spec.X509EncodedKeySpec;
10
11 public class Dsa {
12 public static String src = "hello berber" ;
13 public static void main(String[] args) {
14 jdkDSA();
15 }
16 public static void jdkDSA(){
17 try{
18 // 初始化:
19 KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DSA") ;
20 keyPairGenerator.initialize(512);
21 KeyPair keyPair = keyPairGenerator.generateKeyPair();
22
23 DSAPublicKey dsaPublicKey = (DSAPublicKey)keyPair.getPublic() ;
24 DSAPrivateKey dsaPrivateKey = (DSAPrivateKey)keyPair.getPrivate() ;
25 // 签名:
26 PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());
27 KeyFactory keyFactory = KeyFactory.getInstance("DSA");
28 PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
29 Signature signature = Signature.getInstance("SHA1withDSA");
30 signature.initSign(privateKey);
31 signature.update(src.getBytes());
32 byte arr[] = signature.sign() ;
33 System.out.println("jdk dsa sign:"+ HexBin.encode(arr));
34 // 验证签名
35 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(dsaPublicKey.getEncoded()) ;
36 keyFactory = KeyFactory.getInstance("DSA");
37 PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec) ;
38 signature = Signature.getInstance("SHA1withDSA");
39 signature.initVerify(publicKey);
40 signature.update(src.getBytes());
41 boolean bool = signature.verify(arr) ;
42 System.out.println("jdk dsa verify:"+bool);
43 }catch (Exception e){
44
45 }
46 }
47 }
结果:
过程:
构建密钥对:
发送方: 1.构建密钥对
2.公布密钥
发送数据 :
发送方: 1.使用私钥对数据签名
2.发送签名,数据
3.使用公钥,签名验证数据
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