几种加密算法
分类:
IT文章
•
2023-11-25 15:17:55
Base64加密:
1.org.apache.commons.codec,加密后没有换行
package util;
import java.io.UnsupportedEncodingException;
import org.apache.commons.codec.binary.Base64;
/**
* @todo Apache的 commons-codec.jar得到的编码字符串是不带换行符的
* @author zhangyanan
* @date 2018年8月7日
*/
public class CommonsCodecEncodeDecode {
/**
* 加密str
*
* @param str
* @return
*/
public static String getBase64(String str) {
byte[] b = null;
String s = null;
try {
b = str.getBytes("utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if (b != null) {
s=Base64.encodeBase64String(b);
}
return s;
}
/**
* 解密s
*
* @param str
* @return
*/
public static String getFromBase64(String s) {
byte[] b = null;
String result = null;
if (s != null) {
try {
b = Base64.decodeBase64(s);
result = new String(b, "utf-8");
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
}
View Code
2.sun.misc.BASE64,不推荐使用,加密后有换行回车
package util;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* @todo BASE64加密解密类
* @author zhangyanan
* @date 2018年8月6日
*/
@SuppressWarnings("restriction")
public class EncodeAndDecode {
public static void main(String[] args) {
String base64 = getBase64("http:www.baidu.comasdfsdfcaewfsdcsdfqweafd输入1230.,。");
String fromBase64 = getFromBase64(base64);
System.out.println(base64);
System.out.println();
System.out.println(fromBase64);
}
/**
* 加密str
*
* @param str
* @return
*/
public static String getBase64(String str) {
byte[] b = null;
String s = null;
try {
b = str.getBytes("utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if (b != null) {
s = new BASE64Encoder().encode(b);
}
return s;
}
/**
* 解密s
*
* @param str
* @return
*/
public static String getFromBase64(String s) {
byte[] b = null;
String result = null;
if (s != null) {
BASE64Decoder decoder = new BASE64Decoder();
try {
b = decoder.decodeBuffer(s);
result = new String(b, "utf-8");
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
public static boolean GenerateImage(String base64str, String savepath) { // 对字节数组字符串进行Base64解码并生成图片
if (base64str == null) // 图像数据为空
return false;
// System.out.println("开始解码");
BASE64Decoder decoder = new BASE64Decoder();
try {
// Base64解码
byte[] b = decoder.decodeBuffer(base64str);
// System.out.println("解码完成");
for (int i = 0; i < b.length; ++i) {
if (b[i] < 0) {// 调整异常数据
b[i] += 256;
}
}
// System.out.println("开始生成图片");
// 生成jpeg图片
OutputStream out = new FileOutputStream(savepath);
out.write(b);
out.flush();
out.close();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
}
View Code
3.javax.xml.bind.DatatypeConverter 推荐使用 简洁速度快,没有换行,java1.6开始内置
package util;
import javax.xml.bind.DatatypeConverter;
/**
* @todo
* @author zhangyanan
* @date 2018年8月7日
*/
public class DatatypeConverterTest {
public static void main(String[] args){
String s="www.bai注释";
String printBase64Binary = DatatypeConverter.printBase64Binary(s.getBytes());
System.out.println(printBase64Binary);
byte[] parseBase64Binary = DatatypeConverter.parseBase64Binary(printBase64Binary);
System.out.println(new String(parseBase64Binary));
System.out.println("----------");
}
}
View Code
4.java.util.Base64 推荐使用,速度最快、简洁,没有换行,但要java1.8环境(@参考博客)
import java.io.UnsupportedEncodingException;
import java.util.Base64;
/**
* @todo java8 java.util.Base64测试
* @author zhangyanan
* @date 2018年8月7日
*/
public class TestBase64 {
public static void main(String[] args) throws UnsupportedEncodingException {
// 编码
String asB64 = Base64.getEncoder().encodeToString("聊聊ss33!%".getBytes("utf-8"));
System.out.println(asB64);// 输出为: c29tZSBzdHJpbmc=
// 解码
byte[] asBytes = Base64.getDecoder().decode(asB64);
System.out.println(new String(asBytes, "utf-8"));// 输出为: some string
}
}
View Code
import java.security.*;
import javax.crypto.*;
/**
* DES加解密算法
*/
public class DES {
private static String strDefaultKey = "abcDEF123";
private Cipher encryptCipher = null;
private Cipher decryptCipher = null;
/**
* 默认构造方法,使用默认密钥
* @throws Exception
*/
public DES() throws Exception {
this(strDefaultKey);
}
/**
* 指定密钥构造方法
* @param strKey 指定的密钥
* @throws Exception
*/
public DES(String strKey) throws Exception {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Key key = getKey(strKey.getBytes());
encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
}
/**
* 加密字符串
* @param strIn 需加密的字符串
* @return 加密后的字符串
* @throws Exception
*/
public String encrypt(String strIn) throws Exception {
return byteArr2HexStr(encrypt(strIn.getBytes()));
}
/**
* 加密字节数组
* @param arrB 需加密的字节数组
* @return 加密后的字节数组
* @throws Exception
*/
public byte[] encrypt(byte[] arrB) throws Exception {
return encryptCipher.doFinal(arrB);
}
/**
* 解密字符串
* @param strIn 需解密的字符串
* @return 解密后的字符串
* @throws Exception
*/
public String decrypt(String strIn) throws Exception {
return new String(decrypt(hexStr2ByteArr(strIn)));
}
/**
* 解密字节数组
* @param arrB 需解密的字节数组
* @return 解密后的字节数组
* @throws Exception
*/
public byte[] decrypt(byte[] arrB) throws Exception {
return decryptCipher.doFinal(arrB);
}
/**
* 从指定字符串生成密钥,密钥所需的字节数组长度为8位
* 不足8位时后面补0,超出8位只取前8位
* @param arrBTmp 构成该字符串的字节数组
* @return 生成的密钥
* @throws java.lang.Exception
*/
private Key getKey(byte[] arrBTmp) throws Exception {
byte[] arrB = new byte[8];
for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
}
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
return key;
}
/**
* 将byte数组转换为表示16进制值的字符串,
* 如:byte[]{8,18}转换为:0813,
* 和public static byte[] hexStr2ByteArr(String strIn)
* 互为可逆的转换过程
* @param arrB 需要转换的byte数组
* @return 转换后的字符串
* @throws Exception 本方法不处理任何异常,所有异常全部抛出
*/
public static String byteArr2HexStr(byte[] arrB) throws Exception {
int iLen = arrB.length;
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
while (intTmp < 0) {
intTmp = intTmp + 256;
}
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
/**
* 将表示16进制值的字符串转换为byte数组,
* 和public static String byteArr2HexStr(byte[] arrB)
* 互为可逆的转换过程
* @param strIn 需要转换的字符串
* @return 转换后的byte数组
* @throws Exception 本方法不处理任何异常,所有异常全部抛出
*/
public static byte[] hexStr2ByteArr(String strIn) throws Exception {
byte[] arrB = strIn.getBytes();
int iLen = arrB.length;
byte[] arrOut = new byte[iLen / 2];
for (int i = 0; i < iLen; i = i + 2) {
String strTmp = new String(arrB, i, 2);
arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
}
return arrOut;
}
}