java RSA 加签验签【转】

引用自: http://blog.csdn.net/wangqiuyun/article/details/42143957/

 

java RSA 加签验签

package com.testdemo.core.service.impl.alipay;import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;/*** RSA签名验签类 http://blog.csdn.net/wangqiuyun/article/details/42143957/*/
public class RSASignature {/*** 签名算法*/public static final String SIGN_ALGORITHMS = "SHA1WithRSA";/*** RSA签名* * @param content*            待签名数据* @param privateKey*            商户私钥* @param encode*            字符集编码* @return 签名值*/public static String sign(String content, String privateKey, String encode) {try {PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(new BASE64Decoder().decodeBuffer(privateKey));KeyFactory keyf = KeyFactory.getInstance("RSA");PrivateKey priKey = keyf.generatePrivate(priPKCS8);java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);signature.initSign(priKey);signature.update(content.getBytes(encode));byte[] signed = signature.sign();return new BASE64Encoder().encode(signed);} catch (Exception e) {e.printStackTrace();}return null;}public static String sign(String content, String privateKey) {try {PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(new BASE64Decoder().decodeBuffer(privateKey));KeyFactory keyf = KeyFactory.getInstance("RSA");PrivateKey priKey = keyf.generatePrivate(priPKCS8);java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);signature.initSign(priKey);signature.update(content.getBytes());byte[] signed = signature.sign();return new BASE64Encoder().encode(signed);} catch (Exception e) {e.printStackTrace();}return null;}/*** RSA验签名检查* * @param content*            待签名数据* @param sign*            签名值* @param publicKey*            分配给开发商公钥* @param encode*            字符集编码* @return 布尔值*/public static boolean doCheck(String content, String sign, String publicKey, String encode) {try {KeyFactory keyFactory = KeyFactory.getInstance("RSA");byte[] encodedKey = new BASE64Decoder().decodeBuffer(publicKey);PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);signature.initVerify(pubKey);signature.update(content.getBytes(encode));boolean bverify = signature.verify(new BASE64Decoder().decodeBuffer(sign));return bverify;} catch (Exception e) {e.printStackTrace();}return false;}public static boolean doCheck(String content, String sign, String publicKey) {try {KeyFactory keyFactory = KeyFactory.getInstance("RSA");byte[] encodedKey = new BASE64Decoder().decodeBuffer(publicKey);PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);signature.initVerify(pubKey);signature.update(content.getBytes());boolean bverify = signature.verify(new BASE64Decoder().decodeBuffer(sign));return bverify;} catch (Exception e) {e.printStackTrace();}return false;}}