android 字符串加解密算法

android 字符串加解密算法

/** *加密 **/
    private String encryptPassword(String clearText) {
        try {
            DESKeySpec keySpec = new DESKeySpec(
                    BuildConfig.PASSWORD_ENC_SECRET.getBytes("UTF-8"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(keySpec);

            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            String encrypedPwd = Base64.encodeToString(cipher.doFinal(clearText
                    .getBytes("UTF-8")), Base64.DEFAULT);
            return encrypedPwd;
        } catch (Exception e) {
        }
        return clearText;
    }

/** *解密 **/
    private String decryptPassword(String encryptedPwd) {
        try {
            DESKeySpec keySpec = new DESKeySpec(BuildConfig.PASSWORD_ENC_SECRET.getBytes("UTF-8"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(keySpec);

            byte[] encryptedWithoutB64 = Base64.decode(encryptedPwd, Base64.DEFAULT);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] plainTextPwdBytes = cipher.doFinal(encryptedWithoutB64);
            return new String(plainTextPwdBytes);
        } catch (Exception e) {
        }
        return encryptedPwd;
    }