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[英]how to decrypt an encrypted text using RSACryptoServiceProvider?
[英]How to decrypt an encrypted data in c# by using RSACryptoServiceProvider() in ubuntu?
我正在使用c#中的RSACryptoServiceProvider()
類加密我的數據。 我想解密用c#加密的ubuntu中的數據。 您能建議我解密時需要遵循哪種機制。 以下功能用於加密:
public static void Encrypt(String PublicKey, String plainText, out String cipherText)
{
try
{
int dwKeySize = 1024;
// TODO: Add Proper Exception Handlers
RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider(dwKeySize);
rsaCryptoServiceProvider.FromXmlString(PublicKey);
int keySize = dwKeySize / 8;
byte[] bytes = Encoding.UTF32.GetBytes(plainText);
// The hash function in use by the .NET RSACryptoServiceProvider here is SHA1
// int maxLength = ( keySize ) - 2 - ( 2 * SHA1.Create().ComputeHash( rawBytes ).Length );
int maxLength = keySize - 42;
int dataLength = bytes.Length;
int iterations = dataLength / maxLength;
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i <= iterations; i++)
{
byte[] tempBytes = new byte[(dataLength - maxLength * i > maxLength) ? maxLength : dataLength - maxLength * i];
Buffer.BlockCopy(bytes, maxLength * i, tempBytes, 0, tempBytes.Length);
byte[] encryptedBytes = rsaCryptoServiceProvider.Encrypt(tempBytes, true);
// Be aware the RSACryptoServiceProvider reverses the order
// of encrypted bytes after encryption and before decryption.
// If you do not require compatibility with Microsoft Cryptographic API
// (CAPI) and/or other vendors.
// Comment out the next line and the corresponding one in the
// DecryptString function.
Array.Reverse(encryptedBytes);
// Why convert to base 64?
// Because it is the largest power-of-two base printable using only ASCII characters
stringBuilder.Append(Convert.ToBase64String(encryptedBytes));
}
cipherText = stringBuilder.ToString();
}
catch (Exception e)
{
cipherText = "ERROR_STRING";
Console.WriteLine("Exception in RSA Encrypt: " + e.Message);
//throw new Exception("Exception occured while RSA Encryption" + e.Message);
}
}
不要那樣使用RSA。 這並不是要那樣使用,而且它太慢了。
正確的方法是使用對稱算法(例如AES)並加密與RSA一起使用的密鑰。 看到我的舊博客條目中的C#代碼就是這樣做的。
您需要相同的機制,但相反。 先嘗試,稍后再問。
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