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public modPow ( |
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public void MakeAESKey(string keyExchangeBytes)
{
BigInteger A = new BigInteger(keyExchangeBytes);
byte[] R = A.modPow(privateKey, Module).getBytes();
aesKey = new byte[16];
Array.Copy(R, aesKey, 16);
for (int i = 0; i < 16; i++)
{
byte tmp = (byte)(aesKey[i] >> 4);
byte tmp2 = (byte)(aesKey[i] & 0xF);
if (tmp > 9)
tmp = (byte)(tmp - 9);
if (tmp2 > 9)
tmp2 = (byte)(tmp2 - 9);
aesKey[i] = (byte)( tmp << 4 | tmp2);
}
}
/// <summary>
/// Extracts secret information from the key exchange data.
/// </summary>
/// <param name="keyEx">The key exchange data within which the shared key is hidden.</param>
/// <returns>The shared key derived from the key exchange data.</returns>
public override byte[] DecryptKeyExchange(byte[] keyEx)
{
BigInteger pvr = new BigInteger(keyEx);
BigInteger z = pvr.modPow(m_X, m_P);
byte[] ret = z.getBytes();
z.Clear();
return ret;
}