我需要一些幫助來解決我的問題。RSA Android加密/ RSA PHP解密
問題: 我想用來自Android平臺的公共RSA密鑰加密數字(A),然後用私鑰在PHP服務器上解密它。 在每個平臺上,我可以對數據進行加密和解密(效果很好),但是當PHP腳本試圖解密從ANDROID加密的數據時,它不起作用!
問題是不是從HTTP傳輸,因爲我嘗試直接解密從ANDROID發電加密(編碼爲Base64),它不是在所有的工作......
Findhere後,我的PHP代碼解密數據:
class MyEncryption
{
public $privkey = '';
public $pubkey = '';
public function __construct(){
}
public function initialize() {
$fp=fopen("./encryption/asasap_public.pub","r");
$temp=fread($fp,8192);
fclose($fp);
$this->pubkey = openssl_pkey_get_public($temp);
$fp=fopen("./encryption/asasap.pem","r");
$temp=fread($fp,8192);
fclose($fp);
$this->privkey = openssl_get_privatekey($temp,'');
}
public function encrypt($data)
{
if (openssl_public_encrypt($data, $encrypted, $this->pubkey))
$data = base64_encode($encrypted);
else
throw new Exception('Unable to encrypt data. Perhaps it is bigger than the key size?');
return $data;
}
public function decrypt($data)
{
if (openssl_private_decrypt(base64_decode($data), $decrypted, $this->privkey))
$data = $decrypted;
else
$data = '';
return $data;
}
public function hex2bin($hexdata) {
$bindata = '';
for ($i = 0; $i < strlen($hexdata); $i += 2) {
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}
}
我用這個類喜歡這裏:
$enc = new MyEncryption();
$enc->initialize();
$data_1 = 'K27booXr0zZK4BQlI45MIPJJjPPkpCCPELGvoK/wKYUwShIWE6szlZtrmV83C5eBIrT/3lxWTH3+IOA+5mefurVUvXmQIV7fXEHNHLphyM6L9gQsMAGZMCroPjWKvJM59OMS/d5dwwhiRgzVarxXSKpxBYhEYWJTu7nRJ+bZKjumeoqnCSpmntIiV+tRYgkYflOU6j2QlesjO5tzj/TL6n7vHSO/O1qafJkzHcv8Kn2hTy+IH7QXm7z5vtjXOucHkvBm1xWORXdifh+ChyVvP16dSEmCaCAH6KqtA4viX/HwRFEi4mIWaYSIQk74NdcnQOpFcTgEu2nDwtHaBMqahw==';
$data_2 = $enc->decrypt($data_1);
這裏_1是從Android上的加密數據(A = 5)與RSA公鑰(注初始化:解密在Android上運行良好),但在PHP解密後,我得到空字符串...
------------------------- -----------------更新-------
請在這裏找到Android的部分代碼之後:
public byte[] encryptRSA(final InputStream publicKeyFile, String in) throws IOException, NoSuchAlgorithmException,
InvalidKeySpecException, InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException,
BadPaddingException {
byte[] encodedKey = new byte[5000];
publicKeyFile.read(encodedKey);
X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(encodedKey);
KeyFactory kf = KeyFactory.getInstance("RSA");
PublicKey pkPublic = kf.generatePublic(publicKeySpec);
// Encrypt
Cipher pkCipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
pkCipher.init(Cipher.ENCRYPT_MODE, pkPublic);
return pkCipher.doFinal(in.getBytes());
}
加密數據之後,我將字節[]轉換爲Base64(Base64.encodeToString(輸入,Base64.DEFAULT))。
對於證書,我使用RSA 2048位轉換爲Android的DER格式。
------------------------------------------ SOLUTION --- ----
錯誤是下面幾行:
byte[] encodedKey = new byte[5000];
publicKeyFile.read(encodedKey);
我們必須閱讀exactely公鑰:
byte[] encodedKey = new byte[/*lenght of file*/];
publicKeyFile.read(encodedKey);
那麼Android代碼呢? –