BadPaddingException在Android中解密加密的数据 [英] BadPaddingException decrypting the encrypted data in Android

问题描述

您好我是新的Android安全概念，
阅读一些博客了解我们可以使用公钥加密数据，并可以使用相应的私钥解密，加密似乎没有任何问题，但是当我尝试解密它，它抛出 javax.crypto.BadPaddingException：错误：0407106B：rsa例程：RSA_padding_check_PKCS1_type_2：块类型不是02. 帮助我解决这个问题，我的代码如下，

Hi I'm new to android security concepts, Reading some blogs in 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. Could please some one help me out in solving this problem, My code is as follows,

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);
}

堆栈跟踪如下：

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

我不知道在哪里出错，请帮助我。
感谢。

I'm not sure where am going wrong, please help me out. Thanks .

推荐答案

发生Badpadding异常填充（填充太小的加密块的字节）不匹配指定的格式（例如PKCS1，OAEP，...）。这可能有几个原因：

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模式进行加密和解密。


2. 您从加密获得的数据（字节[]）与传递给解密的数据不同。


3. （您使用的KeyPair不正确。）

RSA的 getInstance（RSA）用于加密， getInstance（RSA / ECB / PKCS1Padding）可能的情况是，ECB / PKCS1Padding 不是Android上的默认值（即使它应该在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).

这在 RSAEncrypt（）：

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

如果这不起作用，请确保传递完全相同的字节[]， code> cipher.doFinal（）加密到 cipher.doFinal（）解密。

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.

（您的代码在我的桌面Java7 btw上工作。）

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