android数据加密（二）AES加密

AES加密是可逆的 

/**
 * AES 加密解密类 
 *
 *
 *
 */
public class EncrypAES {

    // KeyGenerator 提供对称密钥生成器的功能，支持各种算法  
    private static KeyGenerator keygen;
    // SecretKey 负责保存对称密钥  
    private static SecretKey deskey;
    // Cipher负责完成加密或解密工作  
    private static Cipher c;
    // 该字节数组负责保存加密的结果  
    private static byte[] cipherByte;

    static {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        // 实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)  
        try {
            keygen = KeyGenerator.getInstance("AES");

        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block  
            e.printStackTrace();
        }
        // 生成密钥 

        keygen.init(new SecureRandom("这是密匙".getBytes()));
        deskey = keygen.generateKey();

        // 生成Cipher对象,指定其支持的DES算法  
        try {
            c = Cipher.getInstance("AES");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block  
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            // TODO Auto-generated catch block  
            e.printStackTrace();
        }
    }

//  public EncrypAES() throws NoSuchAlgorithmException, NoSuchPaddingException {  
//      Security.addProvider(new com.sun.crypto.provider.SunJCE());  
//      // 实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)  
//      keygen = KeyGenerator.getInstance("AES");  
//      // 生成密钥  
//      deskey = keygen.generateKey();  
//      // 生成Cipher对象,指定其支持的DES算法  
//      c = Cipher.getInstance("AES");  
//  } 

    /**
     * 对字符串加密 
     *
     * @param str
     * @return
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */

    public static String Encrytor(String str) throws InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException {
        // 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式  
        c.init(Cipher.ENCRYPT_MODE, deskey);
        byte[] src = str.getBytes();
        // 加密，结果保存进cipherByte  
        cipherByte = c.doFinal(src);
        return parseByte2HexStr(cipherByte);
    }

    /**
     * 对字符串解密 
     *
     * @param buff
     * @return
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */
    public static String Decryptor(String buff) throws InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException {
        // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式  
        c.init(Cipher.DECRYPT_MODE, deskey);
        cipherByte = c.doFinal(parseHexStr2Byte(buff));
        return new String(cipherByte);
    }

    /**
     * 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;
    }
} 

欢迎大家补充指正

/**
 * AES 加密解密类 
 *
 *
 *
 */
public class EncrypAES {

    // KeyGenerator 提供对称密钥生成器的功能，支持各种算法  
    private static KeyGenerator keygen;
    // SecretKey 负责保存对称密钥  
    private static SecretKey deskey;
    // Cipher负责完成加密或解密工作  
    private static Cipher c;
    // 该字节数组负责保存加密的结果  
    private static byte[] cipherByte;

    static {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        // 实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)  
        try {
            keygen = KeyGenerator.getInstance("AES");

        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block  
            e.printStackTrace();
        }
        // 生成密钥 

        keygen.init(new SecureRandom("这是密匙".getBytes()));
        deskey = keygen.generateKey();

        // 生成Cipher对象,指定其支持的DES算法  
        try {
            c = Cipher.getInstance("AES");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block  
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            // TODO Auto-generated catch block  
            e.printStackTrace();
        }
    }

//  public EncrypAES() throws NoSuchAlgorithmException, NoSuchPaddingException {  
//      Security.addProvider(new com.sun.crypto.provider.SunJCE());  
//      // 实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)  
//      keygen = KeyGenerator.getInstance("AES");  
//      // 生成密钥  
//      deskey = keygen.generateKey();  
//      // 生成Cipher对象,指定其支持的DES算法  
//      c = Cipher.getInstance("AES");  
//  } 

    /**
     * 对字符串加密 
     *
     * @param str
     * @return
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */

    public static String Encrytor(String str) throws InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException {
        // 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式  
        c.init(Cipher.ENCRYPT_MODE, deskey);
        byte[] src = str.getBytes();
        // 加密，结果保存进cipherByte  
        cipherByte = c.doFinal(src);
        return parseByte2HexStr(cipherByte);
    }

    /**
     * 对字符串解密 
     *
     * @param buff
     * @return
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */
    public static String Decryptor(String buff) throws InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException {
        // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式  
        c.init(Cipher.DECRYPT_MODE, deskey);
        cipherByte = c.doFinal(parseHexStr2Byte(buff));
        return new String(cipherByte);
    }

    /**
     * @param args
     * @throws NoSuchPaddingException
     * @throws NoSuchAlgorithmException
     * @throws BadPaddingException
     * @throws IllegalBlockSizeException
     * @throws InvalidKeyException
     */
    public static void main(String[] args) throws Exception {
        EncrypAES de1 = new EncrypAES();
        String msg ="lp;l;l;jmhj";
        String encontent = de1.Encrytor(msg);
        String decontent = de1.Decryptor(encontent);
        System.out.println("明文是:" + msg);
        System.out.println("加密后:" + new String(encontent));
        System.out.println("解密后:" + new String(decontent));
    }

    /**
     * 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;
    }
}  

原文链接：http://www.apkbus.com/blog-337311-60090.html