一些加密解密的代码示例-优快云博客

本文链接：https://blog.youkuaiyun.com/kenly_zhang/article/details/60673

博客涉及解密与加密相关内容，虽未给出具体内容，但从标签推测可能围绕加密解密操作展开，或许会涉及到如exception、string、byte等数据类型及import操作。

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package util;

import java.io.*;
import java.security.*;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;

/**
* CryptTool 封装了一些加密工具方法, 包括 3DES, MD5 等.
*
* @author BeanSoft
* @version 1.0
* 2004-05-12
*/
public class CryptTool {

public CryptTool() {
}

/**
* 生成3DES密钥.
*
* @param key_byte seed key
* @throws Exception
* @return javax.crypto.SecretKey Generated DES key
*/
public static javax.crypto.SecretKey genDESKey(byte[] key_byte) throws
Exception {
// javax.crypto.spec.DESKeySpec deskeyspec = new javax.crypto.spec.DESKeySpec(
// key_byte);
// javax.crypto.SecretKeyFactory skf = javax.crypto.SecretKeyFactory.
// getInstance("DES", "SunJCE");
// return (javax.crypto.SecretKey) skf.generateSecret(deskeyspec);
//KeyGenerator kg = KeyGenerator.getInstance("DESede");
SecretKey k = null;
k = new SecretKeySpec(key_byte,"DESede");
return k;
}

/**
* 3DES 解密(byte[]).
*
* @param key SecretKey
* @param crypt byte[]
* @throws Exception
* @return byte[]
*/
public static byte[] desDecrypt(javax.crypto.SecretKey key, byte[] crypt) throws
Exception {
javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance(
"DESede");
cipher.init(javax.crypto.Cipher.DECRYPT_MODE, key);
return cipher.doFinal(crypt);
}

/**
* 3DES 解密(String).
*
* @param key SecretKey
* @param crypt byte[]
* @throws Exception
* @return byte[]
*/
public static String desDecrypt(javax.crypto.SecretKey key, String crypt) throws
Exception {
return new String(desDecrypt(key, crypt.getBytes()));
}

/**
* 3DES加密(byte[]).
*
* @param key SecretKey
* @param src byte[]
* @throws Exception
* @return byte[]
*/
public static byte[] desEncrypt(javax.crypto.SecretKey key, byte[] src) throws
Exception {
javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance(
"DESede");
cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(src);
}

/**
* 3DES加密(String).
*
* @param key SecretKey
* @param src byte[]
* @throws Exception
* @return byte[]
*/
public static String desEncrypt(javax.crypto.SecretKey key, String src) throws
Exception {
return new String(desEncrypt(key, src.getBytes()));
}

/**
* MD5 摘要计算(byte[]).
*
* @param src byte[]
* @throws Exception
* @return byte[] 16 bit digest
*/
public static byte[] md5Digest(byte[] src) throws Exception {
java.security.MessageDigest alg = java.security.MessageDigest.getInstance(
"MD5"); // MD5 is 16 bit message digest

return alg.digest(src);
}

/**
* MD5 摘要计算(String).
*
* @param src String
* @throws Exception
* @return String
*/
public static String md5Digest(String src) throws Exception {
return new String(md5Digest(src.getBytes()));
}

/**
* BASE64 编码.
*
* @param src String inputed string
* @return String returned string
*/
public static String base64Encode(String src) {
sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

return encoder.encode(src.getBytes());
}

/**
* BASE64 编码(byte[]).
*
* @param src byte[] inputed string
* @return String returned string
*/
public static String base64Encode(byte[] src) {
sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

return encoder.encode(src);
}

/**
* BASE64 解码.
*
* @param src String inputed string
* @return String returned string
*/
public static String base64Decode(String src) {
sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();

try {
return new String(decoder.decodeBuffer(src));
}
catch (Exception ex) {
return null;
}

}

/**
* BASE64 解码(to byte[]).
*
* @param src String inputed string
* @return String returned string
*/
public static byte[] base64DecodeToBytes(String src) {
sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();

try {
return decoder.decodeBuffer(src);
}
catch (Exception ex) {
return null;
}

}

/**
* 对给定字符进行 URL 编码.
*
* @param src String
* @return String
*/
public static String urlEncode(String src) {
try {
src = java.net.URLEncoder.encode(src, "GB2312");

return src;
}
catch (Exception ex) {
ex.printStackTrace();
}

return src;
}

/**
* 对给定字符进行 URL 解码
* @param value 解码前的字符串
* @return 解码后的字符串
*/
public String urlDecode(String value) {
try {
return java.net.URLDecoder.decode(value, "GB2312");
}
catch (Exception ex) {
ex.printStackTrace();
}

return value;
}

/** Test crypt */
public static void main(String[] args) {
byte src_byte[] = "1234567812345678".getBytes();
System.out.println(src_byte.length);
byte key_byte[] = "123456781234567812345678".getBytes();// 3DES 24 bytes key

try {
// 生成DES密钥
javax.crypto.SecretKey deskey;
//生成DES密钥
// javax.crypto.KeyGenerator key = javax.crypto.KeyGenerator.getInstance(
// "DES");
// key.init(56);
// deskey = key.generateKey();

deskey = genDESKey(key_byte);
System.out.println("Generator DES KEY OK");

// DES加解密
byte[] encrypt, decrypt;
//加密
encrypt = desEncrypt(deskey, src_byte);
System.out.println("encrypt=" + new String(encrypt));
//解密
decrypt = desDecrypt(deskey, encrypt);
System.out.println("decrypt=" + new String(decrypt));

// String s = "12345678";
// //加密
// s = desEncrypt(deskey, s);
// System.out.println("encrypt=" + s);
// //解密
// s = desDecrypt(deskey, s);
// System.out.println("decrypt=" + s);

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

System.out.println("BASE64 Test:" + base64Decode(base64Encode("1234")));
}

}