Java 签名（SHA1WithRSA、SHA256WithRSA、SHA256withECDSA）

 1  public static String MakeSign(String Data) {
 2 
 3     try {
 4       byte[] data = Data.getBytes();
 5       byte[] keyBytes = base64String2Byte(PrivateKey);
 6 
 7       PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
 8 
 9       KeyFactory keyFactory = KeyFactory.getInstance("RSA");
10 
11       PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
12 　　　　
13       Signature signature = Signature.getInstance("SHA256withRSA");//这个根据需求填充SHA1WithRSA或SHA256WithRSA
14       signature.initSign(priKey);
15       signature.update(data);
16 
17       return byte2Base64String(signature.sign());
18     } catch (Exception e) {
19       return "";
20     }
21   }

1 // base64字符串转字节数组
2   public static byte[] base64String2Byte(String base64Str) {
3     return Base64.decodeBase64(base64Str);
4   }

 1     public static boolean VeriSign(String Data_ori, String Singnature) {
 2     　　try {
 3       　　byte[] signed = base64String2Byte(Singnature);
 4       
 5       　　X509EncodedKeySpec keySpec = new X509EncodedKeySpec(base64String2Byte(PublicKey));
 6       　　KeyFactory keyFactory = null;
 7       　　keyFactory = KeyFactory.getInstance("RSA");
 8       　　PublicKey publicKey = keyFactory.generatePublic(keySpec);
 9 
10       　　Signature signature2 = Signature.getInstance("Sha256WithRSA");//这个根据需求填充SHA1WithRSA或SHA256WithRSA
11       　　signature2.initVerify(publicKey);
12       　　signature2.update(Data_ori.getBytes("UTF-8"));
13       　　boolean verify = signature2.verify(signed);
14       　　return verify;
15     　　} catch (Exception e) {
16       　　return false;
17     　　}
18   }

 1  public static boolean verifySign(String _data, String _key, String _sign) {
 2 
 3         try {
 4             java.security.spec.X509EncodedKeySpec bobPubKeySpec = new java.security.spec.X509EncodedKeySpec(
 5                     new BASE64Decoder().decodeBuffer(_key));
 6             KeyFactory keyf = KeyFactory.getInstance("EC"); //ECC 可根据需求更改
 7             PublicKey publicKey = keyf.generatePublic(bobPubKeySpec);
 8 
 9             byte[] data = hexStringToBytes(_data);
10             byte[] sig = hexStringToBytes(_sign);
11 
12             Signature signer = Signature.getInstance("SHA256withECDSA");
13             signer.initVerify(publicKey);
14             signer.update(data);
15             return (signer.verify(sig));
16         }
17         catch(Exception ex)
18         {
19             System.out.println(ex.getMessage());
20             return false;
21         }