Android常用加密代码实现

[code]public class DESUtil {
    /**
     * 根据指定的密钥加密字符串
     * @param encryptString 需要加密的字符串
     * @param encryptKey 密钥
     * @return 加密后的字符串
     * @throws Exception
     */
    public static String encryptDES(String encryptString, String encryptKey)
            throws Exception {
        // 实例化IvParameterSpec对象，使用指定的初始化向量，初始化向量根据key生成
        IvParameterSpec zeroIv = new IvParameterSpec(encryptKey.getBytes("ASCII"));
        // 实例化SecretKeySpec类，根据字节数组来构造SecretKey
        SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
        // 创建密码器
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        // 用秘钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
        // 执行加密操作
        byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
        return Base64.encodeToString(encryptedData, Base64.DEFAULT);
    }
    /**
     * 根据指定的密钥对字符串解密
     * @param decrypString 需要解密的字符串
     * @param decryptKey 密钥
     * @return 解密后的字符串
     * @throws Exception
     */
    public static String decryptDES(String decrypString, String decryptKey)
            throws Exception {
        byte[] byteMi = Base64.decode(decrypString, Base64.DEFAULT);
        // 实例化IvParameterSpec对象，使用指定的初始化向量
        IvParameterSpec zeroIv = new IvParameterSpec(decryptKey.getBytes("ASCII"));
        // 实例化SecretKeySpec类，根据字节数组来构造SecretKey
        SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
        // 创建密码器
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        // 用秘钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
        // 执行解密操作
        byte[] decryptedData = cipher.doFinal(byteMi);
        return new String(decryptedData);
    }
}

[code]public class AESUtil {
    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;
    }
    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 (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }