問題描述

我是 Android 安全概念的新手.

I'm new to Android security concepts.

我一直在閱讀一些博客以了解我們可以使用公鑰加密數據并使用相應的私鑰對其進行解密.加密似乎沒有任何問題，但是當我嘗試解密它時，它會拋出:

I have been reading some blogs to get to know about we can encrypt data using Public key and can decrypt it using respective Private key. Encryption seems to be doesn't have any problem, but when I try to decrypt it, it throws:

javax.crypto.BadPaddingException: error:0407106B:rsa routines:RSA_padding_check_PKCS1_type_2:block type is not 02.

javax.crypto.BadPaddingException: error:0407106B:rsa routines:RSA_padding_check_PKCS1_type_2:block type is not 02.

我的代碼如下:

public String RSAEncrypt(final String plain, PublicKey publicKey ) throws NoSuchAlgorithmException, NoSuchPaddingException,
    InvalidKeyException, IllegalBlockSizeException, BadPaddingException {

    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    byte [] encryptedBytes = cipher.doFinal(plain.getBytes());
    String encrypted = bytesToString(encryptedBytes);
    System.out.println("EEncrypted?????" + encrypted );
    return encrypted;
}

public String RSADecrypt(String encryptedBytes,PrivateKey privateKey ) throws NoSuchAlgorithmException, NoSuchPaddingException,
    InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchProviderException {
    Cipher cipher1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher1.init(Cipher.DECRYPT_MODE, privateKey);
    byte [] decryptedBytes = cipher1.doFinal(stringToBytes(encryptedBytes));

    String decrypted = new String(decryptedBytes);
    System.out.println("DDecrypted?????" + decrypted);
    return decrypted;
    }

public  String bytesToString(byte[] b) {
    byte[] b2 = new byte[b.length + 1];
    b2[0] = 1;
    System.arraycopy(b, 0, b2, 1, b.length);
    return new BigInteger(b2).toString(36);
}

public  byte[] stringToBytes(String s) {
    byte[] b2 = new BigInteger(s, 36).toByteArray();
    return Arrays.copyOfRange(b2, 1, b2.length);
}

堆棧跟蹤如下:

07-28 11:27:35.119: I/System.out(22933): KEYSTORE : String to encrypt = > Hello
07-28 11:27:35.119: I/System.out(22933): KEYSTORE : [B@41bbf4d0
07-28 11:27:38.422: I/System.out(22933): KEYSTORE : String to Decrypt = > UJGAchuDhu3mqH5YPjmYqKBapJYMjJRk9g6HIy8bANooWorzwqgiEo+dOse6Nfq7i0yzw/Wt7TSdTNiYROxehkZvEx/mW5+Niw1CgZ2y9b/ijTeNTF+7aGPrqfDXJ38hUFdTPc6oNl2FVOIafncGOSK9po1JOAYeK0JiA2KrACfPLPjsLQSRzseThyYGxttRM7qbx/N0VTmlTeuNpLFld8Gtw3fHR8UoLGkH/OTFYPLZBVNE8t/oCCy8FpcCu9SGXxF8vh1R4rq15bfyyh9sBU9RuVtoLM0wDSbKixHhNOwwx2Z/A+SHDaQD9C+x3p1AnS9FYZm0Y07E+VYQWqzOpw
07-28 11:27:38.562: W/System.err(22933): javax.crypto.BadPaddingException: error:0407106B:rsa routines:RSA_padding_check_PKCS1_type_2:block type is not 02
07-28 11:27:41.515: D/WifiNative-wlan0(773): doString: SIGNAL_POLL
07-28 11:27:41.515: W/WifiHW(773): QCOM Debug wifi_send_command "IFNAME=wlan0 SIGNAL_POLL"
07-28 11:27:41.525: D/wpa_supplicant(16189): nl80211: survey data missing!
07-2
07-28 11:27:56.612: W/WifiHW(773): QCOM Debug wifi_send_command "IFNAME=wlan0 SIGNAL_POLL"
07-28 11:27:56.612: D/wpa_supplicant(16189): nl80211: survey data missing!
07-28 11:27:56.622: I/wpa_supplicant(16189): environment dirty rate=0 [0][0][0]
07-28 11:27:56.622: D/WifiStateMachine(773): fetchRssiAndLinkSpeedNative RSSI = -62 abnormalRssiCnt = 0 newLinkSpeed = 58
07-28 11:27:56.622: D/WifiStateMachine(773): fetchRssiAndLinkSpeedNative mLinkspeedCount = 2, mLinkspeedSum: 116

我不確定哪里出錯了.

推薦答案

當填充(填充太小的加密塊的字節)不匹配指定格式(例如例如 PKCS1、OAEP、...).這可能有幾個原因:

A BadPaddingException occurs when the padding (bytes to fill up a too small encryption block) doesn't match a specified format (for example PKCS1, OAEP, ...). This can have a few causes:

1. 您正在使用不同的 RSA 模式進行加密和解密.
2. 你從加密中得到的數據(字節[])與你傳遞給解密的數據不同.
3. (您使用的密鑰對不正確.)

由于您使用 getInstance("RSA") 初始化 RSA 進行加密，使用 getInstance("RSA/ECB/PKCS1Padding") 進行解密，因此可能ECB/PKCS1Padding 不是 Android 上的默認設置(即使它應該在 Desktop-Java 上).

Since you are initializing RSA with getInstance("RSA") for encryption and getInstance("RSA/ECB/PKCS1Padding") for decryption, it could be possible that ECB/PKCS1Padding is not the default on Android (even though it should be on Desktop-Java).

所以在 RSAEncrypt() 中試試這個:

So try this in RSAEncrypt():

cipher.getInstance("RSA/ECB/PKCS1Padding");

如果這不起作用，請確保將加密中從 cipher.doFinal() 獲得的完全相同的 byte[] 傳遞給 cipher.doFinal()在解密中.

If this does not work, make sure that you pass the exact same byte[] you get from cipher.doFinal() in encryption to cipher.doFinal() in decryption.

(順便說一句，你的代碼在我的 Desktop Java7 上運行.)

這篇關于BadPaddingException 在 Android 中解密加密數據的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！