RSAUtil - RSA加解密工具类
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工具类
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
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 javax.crypto.Cipher;
import org.apache.commons.codec.binary.Base64;
public class RSAUtil {
/**
* 随机生成密钥对
*
* @throws NoSuchAlgorithmException
*/
public static KV<String, String> generateKeyPair() throws NoSuchAlgorithmException {
// KeyPairGenerator类用于生成公钥和私钥对,基于RSA算法生成对象
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
// 初始化密钥对生成器,密钥大小为96-1024位
keyPairGen.initialize(1024, new SecureRandom());
// 生成一个密钥对,保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥
String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
// 得到私钥字符串
String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
return new KV<String, String>(publicKeyString, privateKeyString);
}
/**
* RSA公钥加密
*
* @param str
* 加密字符串
* @param publicKey
* 公钥
* @return 密文
* @throws Exception
* 加密过程中的异常信息
*/
public static String encrypt(String str, String publicKey) throws Exception {
// base64编码的公钥
byte[] decoded = Base64.decodeBase64(publicKey);
RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
.generatePublic(new X509EncodedKeySpec(decoded));
// RSA加密
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
return outStr;
}
/**
* RSA私钥解密
*
* @param str
* 加密字符串
* @param privateKey
* 私钥
* @return 铭文
* @throws Exception
* 解密过程中的异常信息
*/
public static String decrypt(String str, String privateKey) throws Exception {
// 64位解码加密后的字符串
byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
// base64编码的私钥
byte[] decoded = Base64.decodeBase64(privateKey);
RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")
.generatePrivate(new PKCS8EncodedKeySpec(decoded));
// RSA解密
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, priKey);
String outStr = new String(cipher.doFinal(inputByte));
return outStr;
}
private static void testBase64() throws Exception {
String content = "{"name":"xiaoming","name":"xiaoming","name":"xiaoming","name":"xiaoming","name":"xiaoming","name":"xiaoming"}";
content = "7652344555";
byte[] bytes1 = Base64.encodeBase64(content.getBytes("UTF-8"));
String result = new String(bytes1,"UTF-8");
System.out.println(result);
}
public static void main(String[] args) throws Exception {
KV<String, String> kv = RSAUtil.generateKeyPair();
String content = "{"name":"xiaoming","name":"xiaoming","name":"xiaoming","name":"xiaoming","name":"xiaoming","name":"xiaoming"}";
content = "ABCDEFGHI";
String totext = RSAUtil.encrypt(content, kv.getKey());
System.out.println(totext);
String tedxtResult = RSAUtil.decrypt(totext, kv.getValue());
System.out.println(tedxtResult);
System.out.println("-------------------------------");
testBase64() ;
}
}
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