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 /*public*/ byte[] ComputeHash(HMACBuffer[] buffers)
{
for (int i = 0; i < buffers.Length; i++)
{
HMACBuffer hb = buffers[i];
HashCore(hb.buffer, hb.start, hb.length);
}
byte[] ret = (byte [])HashFinal().Clone();
Initialize();
return(ret);
}
