|
pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.dzh</groupId>
<artifactId>encrypt-util</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>encrypt-util</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.55</version>
<!-- <scope>provided</scope> -->
</dependency>
</dependencies>
</project>
关于下面的代码的注意点：
此工具类能使用指定的字符串，每次生成相同的公钥和私钥且在linux和windows密钥也相同；相同的原文和密钥生成的密文相同。
如果需要每次生成不同的密钥或者生成不同的密文，代码要做修改。
下面的代码用到了我写的BASE64加密，参考《加密解密算法java实现（1）—BASE64》
java代码如下：
package com.dzh.rsa;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import com.dzh.base64.BASE64Util;
/**
* RSA加密解密
* 此工具类能使用指定的字符串，每次生成相同的公钥和私钥且在linux和windows密钥也相同；相同的原文和密钥生成的密文相同
*/
public class RSAUtil {
private static final String ALGORITHM_RSA = "RSA";
private static final String ALGORITHM_SHA1PRNG = "SHA1PRNG";
private static final int KEY_SIZE = 1024;
private static final String PUBLIC_KEY = "RSAPublicKey";
private static final String PRIVATE_KEY = "RSAPrivateKey";
private static final String TRANSFORMATION = "RSA/None/NoPadding";
/**
* 解密
* 用私钥解密，解密字符串，返回字符串
* @param data
* @param key
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String data, String key) throws Exception {
return new String(decryptByPrivateKey(BASE64Util.decodeToByte(data), key));
}
/**
* 加密
* 用公钥加密，加密字符串，返回用base64加密后的字符串
* @param data
* @param key
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, String key) throws Exception {
return encryptByBytePublicKey(data.getBytes(), key);
}
/**
* 加密
* 用公钥加密，加密byte数组，返回用base64加密后的字符串
* @param data
* @param key
* @return
* @throws Exception
*/
public static String encryptByBytePublicKey(byte[] data, String key) throws Exception {
return BASE64Util.encodeByte(encryptByPublicKey(data, key));
}
/**
* 解密
* 用私钥解密
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception {
byte[] keyBytes = BASE64Util.decodeToByte(key);//对私钥解密
/*取得私钥*/
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
/*对数据解密*/
Cipher cipher = Cipher.getInstance(TRANSFORMATION, new BouncyCastleProvider());//相同的原文、公钥能生成相同的密文。如果使用Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());//相同的原文、公钥生成的密文不同
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* 加密
* 用公钥加密
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String key) throws Exception {
byte[] keyBytes = BASE64Util.decodeToByte(key);//对公钥解密
/*取得公钥*/
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
/*对数据加密*/
Cipher cipher = Cipher.getInstance(TRANSFORMATION, new BouncyCastleProvider());//相同的原文、公钥能生成相同的密文。如果使用Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());//相同的原文、公钥生成的密文不同
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* 取得私钥
* @param keyMap
* @return
*/
public static String getPrivateKey(Map<String, Object> keyMap) {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return BASE64Util.encodeByte(key.getEncoded());
}
/**
* 取得公钥
* @param keyMap
* @return
*/
public static String getPublicKey(Map<String, Object> keyMap) {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return BASE64Util.encodeByte(key.getEncoded());
}
/**
* 初始化公钥和私钥
* @param seed
* @return
* @throws Exception
*/
public static Map<String, Object> initKey(String seed) throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(ALGORITHM_RSA);
SecureRandom random = SecureRandom.getInstance(ALGORITHM_SHA1PRNG);//如果使用SecureRandom random = new SecureRandom();//windows和linux默认不同，导致两个平台生成的公钥和私钥不同
random.setSeed(seed.getBytes());//使用种子则生成相同的公钥和私钥
keyPairGen.initialize(KEY_SIZE, random);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();//公钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();//私钥
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 使用示例
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
String source = "12dfefDKLJKLKL464d中文f465as43f1a3 f46e353D1F34&*^$E65F46EF43456abcd54as56f00ef";//原文
String seed = "abc123";//种子
System.out.println("原文：\n" + source);
Map<String, Object> keyMap = RSAUtil.initKey(seed);//初始化密钥
String publicKey = RSAUtil.getPublicKey(keyMap);//公钥
String privateKey = RSAUtil.getPrivateKey(keyMap);//私钥
System.out.println("公钥：\n" + publicKey);
System.out.println("私钥：\n" + privateKey);
String encodedStr = RSAUtil.encryptByPublicKey(source, publicKey);//加密
System.out.println("密文：\n" + encodedStr);
String decodedStr = RSAUtil.decryptByPrivateKey(encodedStr, privateKey);//解密
System.out.println("解密后的结果：\n" + decodedStr);
}
}
按照示例使用即可
| 
转播
