如何使用密钥加密和解密android中的json字符串？

Question

我目前正在开发一个基于绘图的项目,我已将值存储为json格式并存储在文件中,但我想通过使用密钥加密json并使用相同的密钥解密json.

Answer 1

使用以下方法使用String resultString = JSON.stringify()和加密您的jsonresultString

public class EncryptUtils {
public static SecretKey generateKey(String mySecret) 
    throws NoSuchAlgorithmException, InvalidKeySpecException 
{ 
    return secret = new SecretKeySpec(mySecret.getBytes(), "AES"); 
}

public static byte[] encryptMsg(String message, SecretKey secret)
    throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidParameterSpecException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException 
{ 
   /* Encrypt the message. */
   Cipher cipher = null; 
   cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
   cipher.init(Cipher.ENCRYPT_MODE, secret); 
   byte[] cipherText = cipher.doFinal(message.getBytes("UTF-8")); 
   return cipherText; 
}

public static String decryptMsg(byte[] cipherText, SecretKey secret) 
    throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidParameterSpecException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException 
{
    /* Decrypt the message, given derived encContentValues and initialization vector. */
    Cipher cipher = null;
    cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, secret); 
    String decryptString = new String(cipher.doFinal(cipherText), "UTF-8");
    return decryptString; 
}
}

String mySecret="mySecretKeyString";
String secretKey = EncryptUtils.generateKey(mySecret);
String encryptedStr = EncryptUtils.encryptMsg(jsonResultString, secretKey));

String decryptedStr = EncryptUtils.decryptMsg(encryptedStr.getBytes("UTF-8"), secretKey));

最后,您可以使用以下方法获取JSON数据

try {

    JSONObject obj = new JSONObject(decryptedString);

    Log.d("My App", obj.toString());

} catch (Throwable t) {
    Log.e("My App", "Could not parse malformed JSON: \"" + json + "\"");
}