Base64.java

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;  
    }  
}

}

DES.java

package cn.crane.game.puzzle.utils.security;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class DES {
private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };

/\*\*  
 \* 加密  
 \*  
 \* @param encryptString  
 \* @param encryptKey  
 \* @return  
 \* @throws Exception  
 \*/  
public static String encryptDES(String encryptString, String encryptKey) {  
    // IvParameterSpec zeroIv = new IvParameterSpec(new byte\[8\]);  
    try {  
        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);  
    } catch (Exception e) {  
        e.printStackTrace();  
    }  
    return "";  
}

/\*\*  
 \* 解密  
 \*  
 \* @param decryptString  
 \* @param decryptKey  
 \* @return  
 \* @throws Exception  
 \*/  
public static String decryptDES(String decryptString, String decryptKey) {  
    try {  
        byte\[\] byteMi = 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);  
    } catch (Exception e) {  
        e.printStackTrace();  
    }  
    return "";

}  

}