<转载>JAVA AES DES MD5 加密字符串

效果AES加密：
加密前：test3444
加密后：88E7373C834F8C1A505172F8BD33579A
解密后：test3444

 
效果DES加密：
 加密前：  要加密的字符串 test
 加密后： pCpv76PEwJR/7bab04sKNdpzNvL7uHYE5AIfLjpNh2E=
 解密后：  要加密的字符串 test

效果MD5加密：
 加密前：  1989-03-03
 加密后： CFCD208495D565EF66E7DFF9F98764DA

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AESTest
{
    /**
     * 加密
     * 
     * @param content 需要加密的内容
     * @param password  加密密码
     * @return
     */
    public static byte[] encrypt(String content, String password)
    {
        try
        {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        catch (NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        catch (InvalidKeyException e)
        {
            e.printStackTrace();
        }
        catch (UnsupportedEncodingException e)
        {
            e.printStackTrace();
        }
        catch (IllegalBlockSizeException e)
        {
            e.printStackTrace();
        }
        catch (BadPaddingException e)
        {
            e.printStackTrace();
        }
        return null;
    }

    /**解密
     * @param content  待解密内容
     * @param password 解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password)
    {
        try
        {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        catch (NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        catch (InvalidKeyException e)
        {
            e.printStackTrace();
        }
        catch (IllegalBlockSizeException e)
        {
            e.printStackTrace();
        }
        catch (BadPaddingException e)
        {
            e.printStackTrace();
        }
        return null;
    }

    /**将二进制转换成16进制
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[])
    {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++)
        {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1)
            {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**将16进制转换为二进制
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr)
    {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++)
        {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte)(high * 16 + low);
        }
        return result;
    }

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        String content = "test3444";
        String password = "11";
        // 加密
        System.out.println("加密前：" + content);
        byte[] encryptResult = encrypt(content, password);
        String encryptResultStr = parseByte2HexStr(encryptResult);
        System.out.println("加密后：" + encryptResultStr);
        // 解密
        byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);
        byte[] decryptResult = decrypt(decryptFrom, password);
        System.out.println("解密后：" + new String(decryptResult));
    }

}

 DES
 
import java.io.FileOutputStream;  
import java.io.InputStream;  
import java.io.OutputStream;  
import java.security.Key;  
import java.security.SecureRandom;  
   
import javax.crypto.Cipher;  
import javax.crypto.CipherInputStream;  
import javax.crypto.CipherOutputStream;  
import javax.crypto.KeyGenerator;  
   
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
   
public class DESUtil {  
   
    Key key ;  
   
    public DESUtil() {  
   
    }  
   
    public DESUtil(String str) {  
       setKey(str); // 生成密匙  
    }  
   
    public Key getKey() {  
       return key ;  
    }  
   
    public void setKey(Key key) {  
       this . key = key;  
    }  
   
    /** 
      * 根据参数生成 KEY 
      */  
    public void setKey(String strKey) {  
       try {  
           KeyGenerator _generator = KeyGenerator.getInstance ( "DES" );  
           _generator.init( new SecureRandom(strKey.getBytes()));  
           this . key = _generator.generateKey();  
           _generator = null ;  
       } catch (Exception e) {  
           throw new RuntimeException(  
                  "Error initializing SqlMap class. Cause: " + e);  
       }  
    }  
   
    /** 
      * 加密 String 明文输入 ,String 密文输出 
      */  
    public String encryptStr(String strMing) {  
       byte [] byteMi = null ;  
       byte [] byteMing = null ;  
       String strMi = "" ;  
       BASE64Encoder base64en = new BASE64Encoder();  
       try {  
           byteMing = strMing.getBytes( "UTF8" );  
           byteMi = this .encryptByte(byteMing);  
           strMi = base64en.encode(byteMi);  
       } catch (Exception e) {  
           throw new RuntimeException(  
                  "Error initializing SqlMap class. Cause: " + e);  
       } finally {  
           base64en = null ;  
           byteMing = null ;  
           byteMi = null ;  
       }  
       return strMi;  
    }  
   
    /** 
      * 解密 以 String 密文输入 ,String 明文输出 
      * 
      * @param strMi 
      * @return 
      */  
    public String decryptStr(String strMi) {  
       BASE64Decoder base64De = new BASE64Decoder();  
       byte [] byteMing = null ;  
       byte [] byteMi = null ;  
       String strMing = "" ;  
       try {  
           byteMi = base64De.decodeBuffer(strMi);  
           byteMing = this .decryptByte(byteMi);  
           strMing = new String(byteMing, "UTF8" );  
       } catch (Exception e) {  
           throw new RuntimeException(  
                  "Error initializing SqlMap class. Cause: " + e);  
       } finally {  
           base64De = null ;  
           byteMing = null ;  
           byteMi = null ;  
       }  
       return strMing;  
    }  
   
    /** 
      * 加密以 byte[] 明文输入 ,byte[] 密文输出 
      * 
      * @param byteS 
      * @return 
      */  
    private byte [] encryptByte( byte [] byteS) {  
       byte [] byteFina = null ;  
       Cipher cipher;  
       try {  
           cipher = Cipher.getInstance ( "DES" );  
           cipher.init(Cipher. ENCRYPT_MODE , key );  
           byteFina = cipher.doFinal(byteS);  
       } catch (Exception e) {  
           throw new RuntimeException(  
                  "Error initializing SqlMap class. Cause: " + e);  
       } finally {  
           cipher = null ;  
       }  
       return byteFina;  
    }  
   
    /** 
      * 解密以 byte[] 密文输入 , 以 byte[] 明文输出 
      * 
      * @param byteD 
      * @return 
      */  
    private byte [] decryptByte( byte [] byteD) {  
       Cipher cipher;  
       byte [] byteFina = null ;  
       try {  
           cipher = Cipher.getInstance ( "DES" );  
           cipher.init(Cipher. DECRYPT_MODE , key );  
           byteFina = cipher.doFinal(byteD);  
       } catch (Exception e) {  
           throw new RuntimeException(  
                  "Error initializing SqlMap class. Cause: " + e);  
       } finally {  
           cipher = null ;  
       }  
       return byteFina;  
    }  
   
    /** 
      * 文件 file 进行加密并保存目标文件 destFile 中 
      * 
      * @param file 
      *             要加密的文件 如 c:/test/srcFile.txt 
      * @param destFile 
      *             加密后存放的文件名 如 c:/ 加密后文件 .txt 
      */  
    public void encryptFile(String file, String destFile) throws Exception {  
       Cipher cipher = Cipher.getInstance ( "DES" );  
       // cipher.init(Cipher.ENCRYPT_MODE, getKey());  
       cipher.init(Cipher. ENCRYPT_MODE , this . key );  
       InputStream is = new FileInputStream(file);  
       OutputStream out = new FileOutputStream(destFile);  
       CipherInputStream cis = new CipherInputStream(is, cipher);  
       byte [] buffer = new byte [1024];  
       int r;  
       while ((r = cis.read(buffer)) > 0) {  
           out.write(buffer, 0, r);  
       }  
       cis.close();  
       is.close();  
       out.close();  
    }  
   
    /** 
      * 文件采用 DES 算法解密文件 
      * 
      * @param file 
      *             已加密的文件 如 c:/ 加密后文件 .txt * 
      * @param destFile 
      *             解密后存放的文件名 如 c:/ test/ 解密后文件 .txt 
      */  
    public void decryptFile(String file, String dest) throws Exception {  
       Cipher cipher = Cipher.getInstance ( "DES" );  
       cipher.init(Cipher. DECRYPT_MODE , this . key );  
       InputStream is = new FileInputStream(file);  
       OutputStream out = new FileOutputStream(dest);  
       CipherOutputStream cos = new CipherOutputStream(out, cipher);  
       byte [] buffer = new byte [1024];  
       int r;  
       while ((r = is.read(buffer)) >= 0) {  
           cos.write(buffer, 0, r);  
       }  
       cos.close();  
       out.close();  
       is.close();  
    }  
   
    public static void main(String[] args) throws Exception {  
       DESUtil des = new DESUtil( "" );  
       // DES 加密文件  
       // des.encryptFile("G:/test.doc", "G:/ 加密 test.doc");  
       // DES 解密文件  
       // des.decryptFile("G:/ 加密 test.doc", "G:/ 解密 test.doc");  
       String str1 = " 要加密的字符串 test" ;  
       // DES 加密字符串  
       String str2 = des.encryptStr(str1);  
       // DES 解密字符串  
       String deStr = des.decryptStr(str2);  
       System. out .println( " 加密前： " + str1);  
       System. out .println( " 加密后： " + str2);  
       System. out .println( " 解密后： " + deStr);  
    }  
}   






MD5：
public class PwdDigest {  
      
	
	
	public static void main(String[] args)
	{
		passwordDigest("0");
	}
    /** 
     * @param myinfo 
     * 为字符串加密 
     * @return 
     */  
    public static String passwordDigest(String myinfo) {  
        String newPwd = "1989-03-03";  
        try {  
            java.security.MessageDigest alga=java.security.MessageDigest.getInstance("MD5");  
//          java.security.MessageDigest alga = java.security.MessageDigest.getInstance("SHA-1");  
            alga.update(myinfo.getBytes());  
            byte[] digesta = alga.digest();  
            newPwd = byte2hex(digesta);  
            System.out.println(newPwd); 
        } catch (java.security.NoSuchAlgorithmException e) {  
            System.out.println("密码加密异常：非法摘要算法"+e);  
//            Loggers.error("密码加密异常：非法摘要算法"+e);  
        }  
        return newPwd;  
  
    }  
  
    public static String byte2hex(byte[] b) // 二行制转字符串  
    {  
        String hs = "";  
        String stmp = "";  
        for (int n = 0; n < b.length; n++) {  
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));  
            if (stmp.length() == 1){  
                hs = hs + "0" + stmp;  
            }else{  
                hs = hs + stmp;  
            }  
        }  
        return hs.toUpperCase();  
    }  
}