public static void EncryptMessage(Internal.ByteArray message, int payloadStart, int blockSize)
{
blockSize = Math.Min(blockSize, message.Length - payloadStart);
message.Position = payloadStart + blockSize;
int length = (int)(Math.Floor((blockSize + RSABlockSize - 1D) / RSABlockSize) * RSABlockSize);
if (length > blockSize)
{
var tmp = new byte[length - blockSize];
s_Random.NextBytes(tmp);
message.WriteBytes(tmp);
blockSize = length;
}
message.Position = payloadStart;
var bytes = ProcessBlock(message.Buffer, payloadStart, RSABlockSize);
message.WriteBytes(bytes, 0, bytes.Length);
}
public int Encrypt(Internal.ByteArray message, int offset = 0, int length = int.MaxValue)
{
length = Math.Min(length, message.Length - offset);
message.Position = offset + length;
int encryptedLength = (int)(Math.Floor((length + BlockSize - 1) / (double)BlockSize) * BlockSize);
if (encryptedLength > length)
{
byte[] tmp = new byte[encryptedLength - length];
_random.NextBytes(tmp);
message.WriteBytes(tmp);
length = encryptedLength;
}
int i = offset;
while (i < offset + length)
{
message.Position = i;
uint v0 = message.ReadUnsignedInt();
uint v1 = message.ReadUnsignedInt();
uint delta = 0x61C88647;
uint sum = 0;
for (int r = 0; r < 32; r++)
{
v0 += (v1 << 4 ^ v1 >> 5) + v1 ^ sum + _key[sum & 3];
sum -= delta;
v1 += (v0 << 4 ^ v0 >> 5) + v0 ^ sum + _key[sum >> 11 & 3];
}
message.Position -= BlockSize;
message.WriteUnsignedInt(v0);
message.WriteUnsignedInt(v1);
i += BlockSize;
}
return(length);
}
