关于JAVA中RSA加签解签，私钥加密公钥解密和公钥加密私钥解密代码详解

在项目中遇到的问题百度了许久总结出来的私钥加密公钥解密和公钥加密私钥解密。

一般为了安全采用的是私钥加密，公钥解密（公钥可以用Base64转换后公开）

package com.paic.ebank.creditcard.common.util;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Arrays;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;

/**
* <p>
* 封装同RSA非对称加密算法有关的方法，可用于数字签名，RSA加密解密
* </p>
*
* @Copyright:WDSsoft
*/

public class RSATool {

public RSATool() {
}

/**使用私钥加密数据
* 用一个已打包成byte[]形式的私钥加密数据，即数字签名
*
* @param keyInByte
*            打包成byte[]的私钥
* @param source
*            要签名的数据，一般应是数字摘要
* @return 签名 byte[]
*/
public static byte[] sign(byte[] keyInByte, byte[] source) {
try {
   PKCS8EncodedKeySpec priv_spec = new PKCS8EncodedKeySpec(keyInByte);
   KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
   PrivateKey privKey = mykeyFactory.generatePrivate(priv_spec);
   Signature sig = Signature.getInstance("SHA1withRSA");
   sig.initSign(privKey);
   sig.update(source);
   return sig.sign();
} catch (Exception e) {
   return null;
}
}

/**
* 验证数字签名
*
* @param keyInByte
*            打包成byte[]形式的公钥
* @param source
*            原文的数字摘要
* @param sign
*            签名（对原文的数字摘要的签名）
* @return 是否证实 boolean
*/
public static boolean verify(byte[] keyInByte, byte[] source, byte[] sign) {
try {
   KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
   Signature sig = Signature.getInstance("SHA1withRSA");
   X509EncodedKeySpec pub_spec = new X509EncodedKeySpec(keyInByte);
   PublicKey pubKey = mykeyFactory.generatePublic(pub_spec);
   sig.initVerify(pubKey);
   sig.update(source);
   return sig.verify(sign);
} catch (Exception e) {
   return false;
}
}

/**
* 建立新的密钥对，返回打包的byte[]形式私钥和公钥
*
* @return 包含打包成byte[]形式的私钥和公钥的object[],其中，object[0]为私钥byte[],object[1]为公钥byte[]
*/
public static Object[] giveRSAKeyPairInByte() {
KeyPair newKeyPair = creatmyKey();
if (newKeyPair == null)
   return null;
Object[] re = new Object[2];
if (newKeyPair != null) {
   PrivateKey priv = newKeyPair.getPrivate();
   byte[] b_priv = priv.getEncoded();
   PublicKey pub = newKeyPair.getPublic();
   byte[] b_pub = pub.getEncoded();
   re[0] = b_priv;
   re[1] = b_pub;
   return re;
}
return null;
}

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/**
* 新建密钥对
*
* @return KeyPair对象
*/
public static KeyPair creatmyKey() {
KeyPair myPair;
long mySeed;
mySeed = System.currentTimeMillis();
try {
   KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
   SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
   random.setSeed(mySeed);
   keyGen.initialize(1024, random);
   myPair = keyGen.generateKeyPair();
} catch (Exception e1) {
   return null;
}
return myPair;
}

/**
* 使用RSA公钥加密数据
*
* @param pubKeyInByte
*            打包的byte[]形式公钥
* @param data
*            要加密的数据
* @return 加密数据
*/
public static byte[] encryptByRSA(byte[] pubKeyInByte, byte[] data) {
try {
   KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
   X509EncodedKeySpec pub_spec = new X509EncodedKeySpec(pubKeyInByte);
   PublicKey pubKey = mykeyFactory.generatePublic(pub_spec);
   Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
   cipher.init(Cipher.ENCRYPT_MODE, pubKey);
   return cipher.doFinal(data);
} catch (Exception e) {
   return null;
}
}

/**
* 用RSA私钥解密
*
* @param privKeyInByte
*            私钥打包成byte[]形式
* @param data
*            要解密的数据
* @return 解密数据
*/
public static byte[] decryptByRSA(byte[] privKeyInByte, byte[] data) {
try {
   PKCS8EncodedKeySpec priv_spec = new PKCS8EncodedKeySpec(
     privKeyInByte);
   KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
   PrivateKey privKey = mykeyFactory.generatePrivate(priv_spec);
   Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
   cipher.init(Cipher.DECRYPT_MODE, privKey);
   return cipher.doFinal(data);
} catch (Exception e) {
   return null;
}

}

/**
* 使用RSA私钥加密数据
*
* @param pubKeyInByte
*            打包的byte[]形式私钥
* @param data
*            要加密的数据
* @return 加密数据
*/
public static byte[] encryptByRSA1(byte[] privKeyInByte, byte[] data) {
try {
    PKCS8EncodedKeySpec priv_spec = new PKCS8EncodedKeySpec(
      privKeyInByte);
    KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
    PrivateKey privKey = mykeyFactory.generatePrivate(priv_spec);
    Cipher cipher = Cipher.getInstance(mykeyFactory.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, privKey);
    return cipher.doFinal(data);
   } catch (Exception e) {
    return null;
   }

}

/**
* 用RSA公钥解密
*
* @param privKeyInByte
*            公钥打包成byte[]形式
* @param data
*            要解密的数据
* @return 解密数据
*/
public static byte[] decryptByRSA1(byte[] pubKeyInByte, byte[] data) {
try {
   KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
   X509EncodedKeySpec pub_spec = new X509EncodedKeySpec(pubKeyInByte);
   PublicKey pubKey = mykeyFactory.generatePublic(pub_spec);
   Cipher cipher = Cipher.getInstance(mykeyFactory.getAlgorithm());
   cipher.init(Cipher.DECRYPT_MODE, pubKey);
   return cipher.doFinal(data);
} catch (Exception e) {
   return null;
}
}

/**
* 计算字符串的SHA数字摘要，以byte[]形式返回
*/
public static byte[] MdigestSHA(String source) {
//byte[] nullreturn = { 0 };
try {
MessageDigest thisMD = MessageDigest.getInstance("SHA");
byte[] digest = thisMD.digest(source.getBytes("UTF-8"));
return digest;
} catch (Exception e) {
return null;
}
}
/**
   *测试
   *
   */
public static void main(String[] args) {
   try {
    //私钥加密公钥解密
    //生成私钥-公钥对
    Object[] v = giveRSAKeyPairInByte();
    //获得摘要
    byte[] source =MdigestSHA("假设这是要加密的客户数据");
    //使用私钥对摘要进行加密获得密文即数字签名
    byte[] sign = sign((byte[]) v[0], source);
    //使用公钥对密文进行解密,解密后与摘要进行匹配
    boolean yes = verify((byte[]) v[1], source, sign);
    if (yes)
     System.out.println("匹配成功合法的签名!");

   //公钥加密私钥解密
    //获得摘要
    byte[] sourcepub_pri = ("13265986584||316494646546486498||01||public").getBytes("UTF-8");

    //使用公钥对摘要进行加密获得密文
    byte[] signpub_pri =encryptByRSA((byte[]) v[1] ,sourcepub_pri);
    //System.out.println("公钥加密密文："+new String(Base64.encodeBase64(signpub_pri)));

    //使用私钥对密文进行解密返回解密后的数据
    byte[] newSourcepub_pri=decryptByRSA((byte[]) v[0],signpub_pri);

    System.out.println("私钥解密："+new String(newSourcepub_pri,"UTF-8"));
    //对比源数据与解密后的数据
    if(Arrays.equals(sourcepub_pri, newSourcepub_pri))
     System.out.println("匹配成功合法的私钥!");



    //私钥加密公钥解密
    //获得摘要
    //byte[] sourcepri_pub = MdigestSHA("假设这是要加密的客户数据");
    byte[] sourcepri_pub = ("13265986584||316494646546486498||01||private").getBytes("UTF-8");

    //使用私钥对摘要进行加密获得密文
    byte[] signpri_pub =encryptByRSA1((byte[]) v[0] ,sourcepri_pub);

//   System.out.println("私钥加密密文："+new String(Base64.encodeBase64(sign11)));
    //使用公钥对密文进行解密返回解密后的数据
    byte[] newSourcepri_pub=decryptByRSA1((byte[]) v[1],signpri_pub);

    System.out.println("公钥解密："+new String(newSourcepri_pub,"UTF-8"));

    String PUBLICKEY="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCEGENnf3rdiO20isoLQqezw12FoWXII9FBw8nR1MWQ3X0CVzOsqY1hOmxD/YI9OB7WVIaVax5tj1l+wk6A0v85Z4OpGWqz4B5L3fCUlBwf/M6DXHlSN1OZttvQF3OeWvc6gvJHihR7pp18zc4KfCJx0Ry6IrGH/2SNOVE1AIgvRQIDAQAB";
    String PRIVATEKEY="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";

    byte[] signPrivate=Base64.decodeBase64(PRIVATEKEY.getBytes());
    byte[] signPublic=Base64.decodeBase64(PUBLICKEY.getBytes());

    String publicpwd ="N/b4nYbbLFVq0yTAIOpNNydtNQUCQxQy0B7bD6kzxLMW2guYxXtWOC/9Z5dpWecx/y7d5CezUJ6cf/8++msiNie4DcKBaFDFPh5rPbjeEB+DRfhjcdR2BsVGXWLsq3dLYLgZObQXG6Tb9rXakuH34Y+6KIIwCjiODH2QAU+PSiM=";
    String privatepwd ="MTMyNjU5ODY1ODR8fDMxNjQ5NDY0NjU0NjQ4NjQ5OHx8MDF8fHByaXZhdGU=";
    //使用私钥对密文进行解密返回解密后的数据
    byte[] newSource111=decryptByRSA(signPrivate,Base64.decodeBase64(publicpwd.getBytes()));
    System.out.println("私钥解密1："+new String(newSource111,"UTF-8"));







   } catch (Exception e) {
    e.printStackTrace();
   }

}

运行结果：

匹配成功合法的签名!
私钥解密：13265986584||316494646546486498||01||public
匹配成功合法的私钥!
公钥解密：13265986584||316494646546486498||01||private
私钥解密1：13265986584||316494646546486498||01||3156464564

关于JAVA中RSA加签解签，私钥加密公钥解密和公钥加密私钥解密代码详解

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