Question

我在Android应用程序中加密数据并对其进行编码以发送到php webservice。
然后我解码它并使用$ rsa-＆gt; decrypt（base64_decode（$ data））解密它;
$ rsa-＆gt; decrypt返回false。为什么会这样？

这是android

中的代码

//get private key 
String privateKeyString = "MIICWwIBAAKBgQDVIJ8H3Oszc5fWdgpwymWksF1WxkXJHIfdS6Ta1bHeqwEzPIkN f3iVk14LfaoSZpRb9Yvi/jvkXxIzJbHq6aKfnQOC6tKIiixvVvpCfxr1eV4urDdz H9RNy9bqGdXzTQdgQi+KRx0Dcy9RNsl7ZGLAGrUFRnPI4GTdH+7wm4QogQIDAQAB AoGAcUcKX7KC7HDm5h0NRY+94H/AzItLsi3Q5MT81Tc5d+EqHSJysdLrs4yFMtRS 3b7Z4dqrxDVefe4uDTNe0j3lqboKz8oKwAU+paKx3wubHb7aeQnfzwM9mPQJHgEO zBjlvbL4oEa/gklu3VohZAc1daqpPajdWuOQQp4S+jUllrECQQDrITlSjvkxt8ud /vYIcEXHew3iW4nzaAH3z4PRAGZofRpk/OusGZ6cdZoYMTZcdxYTCCbZ5eeyGukW 5QCadie1AkEA6Atx8Z0F7WhLI2lGvCGy+vIOL0vBDZSma0cvLYLAXMx8duoWQ9J2 LwT7SsnRXMeq/8wlNHL7mFEf+YFZBKKlHQJAO78kfrr/zUdjwREBWaGVyZuWKpeS FTyvi1W6rAgK/bAUXeb6x69241DqyAzxQEuuW0WuAZ5u4o39/qhQH++4JQJAAepe RW1TaDNNM3yh/dmVXabz4QYSEOeiPA55YDnNFrcFbAHgryyklxzGakaiOM7ZJYVs 5TLxyr8YsXmU34nsLQJALzC8CaFXJcnU0+6+KoKX7iq1aP3X4LgP4Gianix6pfRo aV8UHnfFLRSgPdn1ZYmKtJfnsJXJYoE+o9xEErb5EQ==";

// converts the String to a PublicKey instance
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey key = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(Base64.decode(privateKeyString.toString(), Base64.DEFAULT)));

// encrypts the message
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encrpytedText = cipher.doFinal(Base64.encode(phoneUid.getBytes("CP1252"), Base64.DEFAULT));
data = new String(encrpytedText, "CP1252");

这是php中的代码

include('Crypt/RSA.php');
$rsa = new Crypt_RSA();
//Set the encryption mode
$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);

//check for required fields
if (isset($_POST['data']) {
$data= $_POST['data'];
$key =  '-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDVIJ8H3Oszc5fWdgpwymWksF1W xkXJHIfdS6Ta1bHeqwEzPIkNf3iVk14LfaoSZpRb9Yvi/jvkXxIzJbHq6aKfnQOC 6tKIiixvVvpCfxr1eV4urDdzH9RNy9bqGdXzTQdgQi+KRx0Dcy9RNsl7ZGLAGrUF RnPI4GTdH+7wm4QogQIDAQAB
-----END PUBLIC KEY-----';

$rsa->loadKey($key );
$decrypted = $rsa->decrypt(base64_decode($data));

Answer 1

我解决了我的问题。这是对那些对我做类似事情的人的参考。希望这会有助于其他人。

在android（RSA使用私钥加密）

String encoded = null;
byte[] encrypted = null;
String plaintext = "...";

try {
    String privKeyPEM = "...";
    byte[] decoded = Base64.decode(privKeyPEM, Base64.DEFAULT);
    PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(decoded);
    KeyFactory kf = KeyFactory.getInstance("RSA");
    PrivateKey privKey = kf.generatePrivate(spec);

    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher.init(Cipher.ENCRYPT_MODE, privKey);

    encrypted = cipher.doFinal(plaintext.getBytes());
    encoded = Base64.encodeToString(encrypted, Base64.DEFAULT);
}
catch (Exception e) {
    e.printStackTrace();
}

在PHP中（使用公钥解密）（使用phpseclib）

$publickey = '...';    
$rsa = new Crypt_RSA();
$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);

//decode and decrypt
$decoded =  base64_decode($encrypted);
$rsa->loadKey($publickey);
$decrypted = $rsa->decrypt($decoded);

Answer 2

您是否将正确的参数传递给cipher.doFinal？

引用javadoc entry：

doFinal(byte[] inBuff, short inOffset, short inLength, byte[] outBuff, short outOffset)

此外，在加密后加密密文时，您看起来像是对加密前的明文进行base64编码吗？

在Android中加密，使用phpseclib在PHP中解密

2 个答案: