3DES加密,签名与验签
package com.rht.common.utils;
import org.apache.tomcat.util.codec.binary.Base64;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import java.security.*;
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;
public class EncryptUtil {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/**
* @author: zhoujiong
* @description: 获取公私钥
* @date: 2018/10/10 17:10
* @param: []
* @return: java.util.Map<java.lang.String,java.lang.String>
*/
public static Map<String, String> genKeyPair() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, String> keyMap = new HashMap<String, String>(2);
String prikey = Base64.encodeBase64String(privateKey.getEncoded());
String pubkey = Base64.encodeBase64String(publicKey.getEncoded());
keyMap.put(PUBLIC_KEY, pubkey);
keyMap.put(PRIVATE_KEY, prikey);
System.out.println("privateKey:"+prikey);
System.out.println("publicKey:"+pubkey);
return keyMap;
}
/**
* @author: zhoujiong
* @description: 签名
* @date: 2018/10/10 17:11
* @param: [data, privateKey]
* @return: java.lang.String
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64.decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64.encodeBase64String(signature.sign());
}
/**
* @author: zhoujiong
* @description: 验签
* @date: 2018/10/10 17:11
* @param: [data, publicKey, sign]
* @return: boolean
*/
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
byte[] keyBytes = Base64.decodeBase64(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64.decodeBase64(sign));
}
public static void main(String[] args) throws Exception {
Map<String,String> key = genKeyPair();
String data = "加密内容";
String signature = sign(data.getBytes("UTF-8"),key.get(PRIVATE_KEY));
boolean bool = verify(data.getBytes("UTF-8"),key.get(PUBLIC_KEY),signature);
System.out.println(bool);
//测试3DES加密
String DESdata = "我要3DES加密";
String deskey = ThreeDeskey.generateString(24);
System.out.println("3des加密key:"+deskey);
String encrydata = encryptThreeDESECB(DESdata,deskey);
System.out.println("加密字符串:"+encrydata);
String decryptdata = decryptThreeDESECB(encrydata,deskey);
System.out.println("解密后字符串:"+decryptdata);
}
/**
* @author: zhoujiong
* @description: 3DES加密
* @date: 2018/10/10 17:13
* @param: [src, key]
* @return: java.lang.String
*/
// 3DESECB加密,key必须是长度大于等于 3*8 = 24 位哈
public static String encryptThreeDESECB(final String src, final String key) throws Exception {
final DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));
final SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
final SecretKey securekey = keyFactory.generateSecret(dks);
final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, securekey);
final byte[] b = cipher.doFinal(src.getBytes());
final BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(b).replaceAll("\r", "").replaceAll("\n", "");
}
/**
* @author: zhoujiong
* @description: 3DES解密
* @date: 2018/10/10 17:14
* @param: [src, key]
* @return: java.lang.String
*/
// 3DESECB解密,key必须是长度大于等于 3*8 = 24 位哈
public static String decryptThreeDESECB(final String src, final String key) throws Exception {
// --通过base64,将字符串转成byte数组
final BASE64Decoder decoder = new BASE64Decoder();
final byte[] bytesrc = decoder.decodeBuffer(src);
// --解密的key
final DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));
final SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
final SecretKey securekey = keyFactory.generateSecret(dks);
// --Chipher对象解密
final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, securekey);
final byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}
}
密钥生成
package com.rht.common.utils;
import java.util.Random;
public class ThreeDeskey {
public static final String ALLCHAR = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
public static final String LETTERCHAR = "abcdefghijkllmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
public static final String NUMBERCHAR = "0123456789";
/**
* 返回一个定长的带因子的固定的随机字符串(只包含大小写字母、数字)
*
* @param length
* 随机字符串长度
* @return 随机字符串
*/
public static String generateStringByKey(int length, int channel) {
StringBuffer sb = new StringBuffer();
Random random = new Random(channel);
for (int i = 0; i < length; i++) {
sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
}
return sb.toString();
}
/**
* 返回一个定长的随机字符串(只包含大小写字母、数字)
*
* @param length
* 随机字符串长度
* @return 随机字符串
*/
public static String generateString(int length) {
StringBuffer sb = new StringBuffer();
Random random = new Random();
for (int i = 0; i < length; i++) {
sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
}
return sb.toString();
}
/**
* 返回一个定长的随机纯字母字符串(只包含大小写字母)
*
* @param length
* 随机字符串长度
* @return 随机字符串
*/
public static String generateMixString(int length) {
StringBuffer sb = new StringBuffer();
Random random = new Random();
for (int i = 0; i < length; i++) {
sb.append(ALLCHAR.charAt(random.nextInt(LETTERCHAR.length())));
}
return sb.toString();
}
/**
* 返回一个定长的随机纯大写字母字符串(只包含大小写字母)
*
* @param length
* 随机字符串长度
* @return 随机字符串
*/
public static String generateLowerString(int length) {
return generateMixString(length).toLowerCase();
}
/**
* 返回一个定长的随机纯小写字母字符串(只包含大小写字母)
*
* @param length
* 随机字符串长度
* @return 随机字符串
*/
public static String generateUpperString(int length) {
return generateMixString(length).toUpperCase();
}
/**
* 生成一个定长的纯0字符串
*
* @param length
* 字符串长度
* @return 纯0字符串
*/
public static String generateZeroString(int length) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
sb.append('0');
}
return sb.toString();
}
/**
* 根据数字生成一个定长的字符串,长度不够前面补0
*
* @param num
* 数字
* @param fixdlenth
* 字符串长度
* @return 定长的字符串
*/
public static String toFixdLengthString(long num, int fixdlenth) {
StringBuffer sb = new StringBuffer();
String strNum = String.valueOf(num);
if (fixdlenth - strNum.length() >= 0) {
sb.append(generateZeroString(fixdlenth - strNum.length()));
} else {
throw new RuntimeException("将数字" + num + "转化为长度为" + fixdlenth + "的字符串发生异常!");
}
sb.append(strNum);
return sb.toString();
}
/**
* 每次生成的len位数都不相同
*
* @param param
* @return 定长的数字
*/
public static int getNotSimple(int[] param, int len) {
Random rand = new Random();
for (int i = param.length; i > 1; i--) {
int index = rand.nextInt(i);
int tmp = param[index];
param[index] = param[i - 1];
param[i - 1] = tmp;
}
int result = 0;
for (int i = 0; i < len; i++) {
result = result * 10 + param[i];
}
return result;
}
public static void main(String[] args) {
int channel = 222222;// 测试因子比生产因子少1
System.out.println("返回一个定长的带因子的固定的随机字符串(只包含大小写字母、数字):" + generateStringByKey(32, channel));
System.out.println("返回一个定长的随机字符串(只包含大小写字母、数字):" + generateString(32));
System.out.println("返回一个定长的随机纯字母字符串(只包含大小写字母):" + generateMixString(10));
System.out.println("返回一个定长的随机纯大写字母字符串(只包含大小写字母):" + generateLowerString(10));
System.out.println("返回一个定长的随机纯小写字母字符串(只包含大小写字母):" + generateUpperString(10));
System.out.println("生成一个定长的纯0字符串:" + generateZeroString(10));
System.out.println("根据数字生成一个定长的字符串,长度不够前面补0:" + toFixdLengthString(123, 10));
int[] in = { 1, 2, 3, 4, 5, 6, 7 };
System.out.println("每次生成的len位数都不相同:" + getNotSimple(in, 3));
}
}