JDK自带方法实现RSA数字签名

  1 package jdbc.pro.lin;  2   3 import java.security.InvalidKeyException;  4 import java.security.NoSuchAlgorithmException;  5 import java.security.PrivateKey;  6 import java.security.PublicKey;  7 import java.security.Signature;  8 import java.security.SignatureException;  9 import java.util.Map; 10  11 import jdbc.pro.lin.MyRSA; 12  13 /** 14  * RSA数字签名，借用MyRSA中的算法，不再重复 15  * 数字签名遵循"私钥签名，公钥验签"原则，因为私钥是个人身份认证 16  * @author Kinsley 17  * 18  */ 19 public class MySignature { 20      21     /** 数字签名算法。JDK只提供了MD2withRSA, MD5withRSA, SHA1withRSA，其他的算法需要第三方包才能支持 */ 22     public static final String SIGNATURE_ALGORITHM = "SHA1withRSA"; 23      24     public static final String PLAIN_TEXT = "MANUTD is the greatest club in the world"; 25     public static void main(String[] args) 26     { 27         //建立两套公私钥对 28         Map keyMap1 = MyRSA.generateKeyBytes(); 29         PublicKey publicKey1 = MyRSA.restorePublicKey(keyMap1.get(MyRSA.PUBLIC_KEY)); 30         PrivateKey privateKey1 = MyRSA.restorePrivateKey(keyMap1.get(MyRSA.PRIVATE_KEY)); 31          32         Map keyMap2 = MyRSA.generateKeyBytes(); 33         PublicKey publicKey2 =MyRSA.restorePublicKey(keyMap2.get(MyRSA.PUBLIC_KEY)); 34         PrivateKey privateKey2 =MyRSA.restorePrivateKey(keyMap2.get(MyRSA.PRIVATE_KEY)); 35          36         /** 假设现在A签名后向B发送消息 37          * A用B的公钥进行加密 38          * 用自己A的私钥进行签名 39          */ 40         byte[] encodedText = MyRSA.RSAEncode(publicKey2, PLAIN_TEXT.getBytes()); 41         byte[] signature = sign(privateKey1, PLAIN_TEXT.getBytes()); 42          43         /** 44          * 现在B收到了A的消息，进行两步操作 45          * 用B的私钥解密得到明文 46          * 将明文和A的公钥进行验签操作 47          */ 48          49         byte[] decodedText = MyRSA.RSADecode(privateKey2, encodedText).getBytes(); 50         System.out.println("Decoded Text: " + new String(decodedText)); 51          52         System.out.println("Signature is " + verify(publicKey1, signature, decodedText)); 53     } 54      55     /** 56      * 签名，三步走 57      * 1. 实例化，传入算法 58      * 2. 初始化，传入私钥 59      * 3. 签名 60      * @param key 61      * @param plainText 62      * @return 63      */ 64     public static byte[] sign(PrivateKey privateKey, byte[] plainText) 65     { 66         try { 67             //实例化 68             Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM); 69              70             //初始化，传入私钥 71             signature.initSign(privateKey); 72              73             //更新 74             signature.update(plainText); 75              76             //签名 77             return signature.sign(); 78              79         } catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException e) { 80             // TODO Auto-generated catch block 81             e.printStackTrace(); 82         } 83          84         return null; 85     } 86      87     /** 88      * 验签，三步走 89      * 1. 实例化，传入算法 90      * 2. 初始化，传入公钥 91      * 3. 验签 92      * @param publicKey 93      * @param signatureVerify 94      * @param plainText 95      * @return 96      */ 97     public static boolean verify(PublicKey publicKey, byte[] signatureVerify, byte[] plainText ) 98     { 99         try {100             //实例化101             Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);102             103             //初始化104             signature.initVerify(publicKey);105             106             //更新107             signature.update(plainText);108             109             //验签110             return signature.verify(signatureVerify);111         } catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException e) {112             // TODO Auto-generated catch block113             e.printStackTrace();114         }115         116         return false;117     }118 }