/// <summary>
/// Compute RC4HMAC.
/// </summary>
/// <param name="key">The key to do RC4HMAC.</param>
/// <param name="macContent">The content to do HMAC.</param>
/// <param name="data">The data to be computed.</param>
/// <param name="isExport">True for EncryptionType.RC4_HMAC_EXP, false for EncryptionType.RC4_HMAC.</param>
/// <returns>The computed result.</returns>
public static byte[] RC4HMAC(byte[] key, byte[] macContent, byte[] data, bool isExport)
{
byte[] Kseq = null;
if (isExport) // EncryptionType.RC4_HMAC_EXP
{
// Kseq = HMAC(Kss, "fortybits", (int32)0);
Kseq = KerberosUtility.HMAC(key, KerberosConstValue.FORTY_BITS, 0);
// memset(Kseq+7, 0xab, 9)
for (int i = 0; i < 9; ++i)
{
Kseq[i + 7] = 0xab;
}
}
else // EncryptionType.RC4_HMAC
{
Kseq = KerberosUtility.HMAC(key, 0);
}
Kseq = HMAC(Kseq, macContent);
return(KerberosUtility.RC4(Kseq, data));
}
