作为我们这一行，最重要的就是保护数据。。。所以，在接受服务端的数据或者传送过去的时候，我们都要保护好·自己的数据，这样起步，谁也不伤害谁！嘿嘿。。。
然后自己这里呢，有一个的demo，这样是吧加密提取出来的，然后想要用，随时可以用就ok！
这是base64：
package com.android.utills;import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;public class Base64 {
private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray();/**
* data[]进行编码
*
* @param data
* @return
*/
public static String encode(byte[] data) {
int start = 0;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * 3 / 2);int end = len - 3;
int i = start;
int n = 0;while (i <= end) {
int d = ((((int) data[i]) & 0x0ff) << 16)
| ((((int) data[i + 1]) & 0x0ff) << 8)
| (((int) data[i + 2]) & 0x0ff);buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append(legalChars[d & 63]);i += 3;
if (n++ >= 14) {
n = 0;
buf.append(" ");
}
}if (i == start + len - 2) {
int d = ((((int) data[i]) & 0x0ff) << 16)
| ((((int) data[i + 1]) & 255) << 8);buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append("=");
} else if (i == start + len - 1) {
int d = (((int) data[i]) & 0x0ff) << 16;buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append("==");
}return buf.toString();
}private static int decode(char c) {
if (c >= ‘A‘ && c <= ‘Z‘)
return ((int) c) - 65;
else if (c >= ‘a‘ && c <= ‘z‘)
return ((int) c) - 97 + 26;
else if (c >= ‘0‘ && c <= ‘9‘)
return ((int) c) - 48 + 26 + 26;
else
switch (c) {
case ‘+‘:
return 62;
case ‘/‘:
return 63;
case ‘=‘:
return 0;
default:
throw new RuntimeException("unexpected code: " + c);
}
}/**
* Decodes the given Base64 encoded String to a new byte array. The byte
* array holding the decoded data is returned.
*/public static byte[] decode(String s) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
decode(s, bos);
} catch (IOException e) {
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try {
bos.close();
bos = null;
} catch (IOException ex) {
System.err.println("Error while decoding BASE64: " + ex.toString());
}
return decodedBytes;
}private static void decode(String s, OutputStream os) throws IOException {
int i = 0;int len = s.length();
while (true) {
while (i < len && s.charAt(i) <= ‘ ‘)
i++;if (i == len)
break;int tri = (decode(s.charAt(i)) << 18)
+ (decode(s.charAt(i + 1)) << 12)
+ (decode(s.charAt(i + 2)) << 6)
+ (decode(s.charAt(i + 3)));os.write((tri >> 16) & 255);
if (s.charAt(i + 2) == ‘=‘)
break;
os.write((tri >> 8) & 255);
if (s.charAt(i + 3) == ‘=‘)
break;
os.write(tri & 255);i += 4;
}
}}
这是DES：
package com.android.utills;import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;/**
* DES加密工具类
*/
public class DesUtil {private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
public static String encryptDES(String encryptString, String encryptKey)
throws Exception {
// IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
byte[] encryptedData = cipher.doFinal(encryptString.getBytes());return Base64.encode(encryptedData);
}public static String decryptDES(String decryptString, String decryptKey)
throws Exception {
byte[] byteMi = new Base64().decode(decryptString);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
// IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
byte decryptedData[] = cipher.doFinal(byteMi);return new String(decryptedData);
}
/*
* private static final String ENCRYPT_TYPE = "DES"; private static String
* defaultKey = "";// 字符串默认键值 private Cipher encryptCipher = null;// 加密工具
* private Cipher decryptCipher = null;// 解密工具
*
* public DesUtil() throws Exception { this(defaultKey); }
*//**
* 指定密钥构造方法
*
* @param strKey
* 指定的密钥
* @throws Exception
*/
/*
* public DesUtil(String strKey) throws Exception { Security.addProvider(new
* com.sun.crypto.provider.SunJCE()); Key key = getKey(strKey.getBytes());
* encryptCipher = Cipher.getInstance(ENCRYPT_TYPE);
* encryptCipher.init(Cipher.ENCRYPT_MODE, key); decryptCipher =
* Cipher.getInstance(ENCRYPT_TYPE); decryptCipher.init(Cipher.DECRYPT_MODE,
* key); }
*//**
* 加密字节数组
*
* @param arr
* 需加密的字节数组
* @return 加密后的字节数组
* @throws Exception
*/
/*
* private byte[] encryptStr(byte[] arr) throws Exception { return
* encryptCipher.doFinal(arr); }
*//**
* 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
* StrConvertUtil.byteArrToHexStr(encryptStr(strIn.getBytes())); }
*//**
* 解密字节数组
*
* @param arr
* 需解密的字节数组
* @return 解密后的字节数组
* @throws Exception
*/
/*
* private byte[] decryptStr(byte[] arr) throws Exception { return
* decryptCipher.doFinal(arr); }
*//**
* 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(decryptStr(StrConvertUtil.hexStrToByteArr(strIn))); }
*//**
* 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
*/
/*
* private Key getKey(byte[] arrBTmp) { byte[] arrB = new byte[8];//
* 创建一个空的8位字节数组（默认值为0） // 将原始字节数组转换为8位 for (int i = 0; i < arrBTmp.length &&
* i < arrB.length; i++) { arrB[i] = arrBTmp[i]; } Key key = new
* javax.crypto.spec.SecretKeySpec(arrB, ENCRYPT_TYPE);// 生成密钥 return key; }
*/
}
这是MD5：
package com.android.utills;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;/**
* MD5加密工具类
*
*/
public class Md5Util {/**
* 根据输入的字符串生成固定的32位MD5码
*
* @param str
* 输入的字符串
* @return MD5码
*/
public final static String getMd5(String str) {
MessageDigest mdInst = null;
try {
mdInst = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
mdInst.update(str.getBytes());// 使用指定的字节更新摘要
byte[] md = mdInst.digest();// 获得密文
return StrConvertUtil.byteArrToHexStr(md);
}
}
这是转换：
package com.android.utills;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;/**
* MD5加密工具类
*
*/
public class Md5Util {/**
* 根据输入的字符串生成固定的32位MD5码
*
* @param str
* 输入的字符串
* @return MD5码
*/
public final static String getMd5(String str) {
MessageDigest mdInst = null;
try {
mdInst = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
mdInst.update(str.getBytes());// 使用指定的字节更新摘要
byte[] md = mdInst.digest();// 获得密文
return StrConvertUtil.byteArrToHexStr(md);
}
}
okay、。。
当然，这里还有提供详细加密的路径链接：
http://apprentice.blog.51cto.com/2214645/1381824
http://hi.baidu.com/cuihenrychl/item/751966f0c31e310acf9f32e4?qq-pf-to=pcqq.c2c