private static byte [] HMACSHA1HashForData(byte [] buf, byte [] modifier, int start, int length)
{
ExtendedHMACSHA1 hmac = ExtendedHMACSHA1.GetHMACSHA1(); // Pick up an ExtendedHMACSHA1 off the pool
HMACBuffer [] hbufs;
if (modifier != null)
{
hbufs = new HMACBuffer[2];
hbufs[1].buffer = modifier;
hbufs[1].start = 0;
hbufs[1].length = modifier.Length;
}
else
{
hbufs = new HMACBuffer[1];
}
hbufs[0].buffer = buf;
hbufs[0].start = start;
hbufs[0].length = length;
byte [] ret = hmac.ComputeHash(hbufs);
ExtendedHMACSHA1.ReturnHMACSHA1(hmac);
return(ret);
}
internal static void ReturnHMACSHA1(ExtendedHMACSHA1 hmac)
{
if (sha1s == null)
{
return;
}
lock (sha1s) {
if (sha1s.Count > 100)
{
return;
}
else
{
sha1s.Push(hmac);
}
}
}
private static void ConfigureEncryptionObject(MachineKeyConfig config)
{
s_validationKey = config.ValidationKey;
byte [] dKey = config.DecryptionKey;
ExtendedHMACSHA1.SetValidationKey(s_validationKey);
config.DestroyKeys();
if (config.AutogenKey)
{
try {
s_oDes = new TripleDESCryptoServiceProvider();
s_oDes.Key = dKey;
}
catch (Exception) {
if (config.ValidationMode == MachineKeyValidationMode.TripleDES)
{
throw;
}
s_oDes = new DESCryptoServiceProvider();
byte [] bArray = new byte[8];
Buffer.BlockCopy(dKey, 0, bArray, 0, 8);
s_oDes.Key = bArray;
}
}
else
{
s_oDes = (dKey.Length == 8) ?
(SymmetricAlgorithm) new DESCryptoServiceProvider() :
(SymmetricAlgorithm) new TripleDESCryptoServiceProvider();
s_oDes.Key = dKey;
}
s_oDes.IV = new byte[8];
s_oEncryptorStack = new Stack();
s_oDecryptorStack = new Stack();
DestroyByteArray(dKey);
}