使用AES / ECB / PKCS5Padding加密時無法解密-輸入長度必須是16的倍數

Question

我有沒有問題的加密代碼。 我可以解密用另一種語言加密的文本，但是現在需要在Java中解密。

 private static final String AES = "AES";
    private static final String CBC_BLOCK = "CBC";
    private static final String ECB_BLOCK = "ECB";
    private static final String PADDING = "PKCS5Padding";
    private static final String AES_CBC_PCKS5_CIPHER_CONFIG = AES + "/" + CBC_BLOCK + "/" + PADDING;
    private static final String AES_ECB_PCKS5_CIPHER_CONFIG = AES + "/" + ECB_BLOCK + "/" + PADDING;

 public static String encryptInAesEcbPkcs5Padding(String salt, String message) {
        String encryptedMessage = "";
        SecretKeySpec key = null;
        try {
            if (message != null && !message.equals("")) {
                key = new SecretKeySpec(salt.getBytes(StandardCharsets.UTF_8), AES);
                Cipher cipher = Cipher.getInstance(AES_ECB_PCKS5_CIPHER_CONFIG);
                cipher.init(Cipher.ENCRYPT_MODE, key);
                encryptedMessage = convertMessageToBase64(cipher.doFinal(message.getBytes(StandardCharsets.UTF_8)));
            }
        } catch (NoSuchAlgorithmException e) {
            LOGGER.error(LogPreFix.ERROR + "No such algorithm [" + AES + "]", e);
        } catch (NoSuchPaddingException e) {
            LOGGER.error(LogPreFix.ERROR + "No such padding for algorithm [" + AES + "]", e);
        } catch (IllegalBlockSizeException e) {
            LOGGER.error(LogPreFix.ERROR + "Invalid block size for [" + AES + "/" + ECB_BLOCK + "]", e);
        } catch (BadPaddingException e) {
            LOGGER.error(LogPreFix.ERROR + "Invalid padding [" + PADDING + "]", e);
        } catch (InvalidKeyException e) {
            LOGGER.error("Invalid key [" + key + "]", e);
        }
        return encryptedMessage;
    }

嘗試使用此代碼解密。 我使用與加密完全相同的鹽，並將加密器創建的字符串作為“消息”傳遞

public static String decrypt(String message, String salt) throws InvalidAlgorithmParameterException {
        SecretKeySpec key = null;
        String string = null;
        try {
            if (message != null && !message.equals("")) {
                key = new SecretKeySpec(salt.getBytes(StandardCharsets.UTF_8), AES);
                Cipher cipher = Cipher.getInstance(AES_ECB_PCKS5_CIPHER_CONFIG);
                cipher.init(Cipher.DECRYPT_MODE, key);
                byte[] decrypted = cipher.doFinal(message.getBytes(StandardCharsets.UTF_8));
                string = new String(decrypted);
            }
        } catch (NoSuchAlgorithmException e) {
            LOGGER.error(LogPreFix.ERROR + "No such algorithm [" + AES + "]", e);
        } catch (NoSuchPaddingException e) {
            LOGGER.error(LogPreFix.ERROR + "No such padding for algorithm [" + AES + "]", e);
        } catch (IllegalBlockSizeException e) {
            LOGGER.error(LogPreFix.ERROR + "Invalid block size for [" + AES + "/" + ECB_BLOCK + "]", e);
        } catch (BadPaddingException e) {
            LOGGER.error(LogPreFix.ERROR + "Invalid padding [" + PADDING + "]", e);
        } catch (InvalidKeyException e) {
            LOGGER.error("Invalid key [" + key + "]", e);
        }
        return string;
    }

但是我收到此錯誤，我在做什么錯？ 好像它應該工作。 我嘗試用“ =”填充加密的文本，直到被16整除，但這會返回錯誤的填充錯誤。

javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:750)
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:676)
    at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:313)
    at javax.crypto.Cipher.doFinal(Cipher.java:2087)

Answer 1

首先進行Base64解碼，以反轉在原始加密過程中執行的Base64編碼。