public static string RSAEncryptLong(string XmlPublicKey, string PlainText)
{
byte[] publicInfoByte = Convert.FromBase64String(XmlPublicKey);
AsymmetricKeyParameter publicKey = PublicKeyFactory.CreateKey(publicInfoByte);
var decryptEngine = new OaepEncoding(new RsaEngine());
decryptEngine.Init(true, publicKey);
byte[] bytesToDecrypt = Encoding.Default.GetBytes(PlainText);
int MaxPlainTextLength = Common.GetOEAPFixedMaxPlainTextLength(decryptEngine.GetOutputBlockSize());
byte[] decrypted = null;
int Times = (bytesToDecrypt.Length - 1) / MaxPlainTextLength + 1;
List <byte> encryptedCache = new List <byte>();
int Counter = 0;
while (Counter < Times)
{
int RemainLength = bytesToDecrypt.Length - MaxPlainTextLength * Counter;
int Length = MaxPlainTextLength > RemainLength ? RemainLength : MaxPlainTextLength;
byte[] decryptedPatch = decryptEngine.ProcessBlock(bytesToDecrypt, MaxPlainTextLength * Counter, Length);
encryptedCache.AddRange(decryptedPatch);
Counter++;
}
decrypted = encryptedCache.ToArray();
return(Convert.ToBase64String(decrypted));
}