public static byte[] SymmetricSign(byte[] key, ArraySegment <byte> data, SecurityPolicy policy)
{
using (MemoryStream memoryStream = new MemoryStream(data.Array, data.Offset, data.Count))
{
return(UASecurity.HMACForSecurityPolicy(key, policy).ComputeHash(memoryStream));
}
}
public static byte[] PSHA(byte[] secret, byte[] seed, int length, SecurityPolicy policy)
{
HMAC hmac = UASecurity.HMACForSecurityPolicy(secret, policy);
int val1 = UASecurity.SignatureSizeForSecurityPolicy(policy);
byte[] hash1 = hmac.ComputeHash(seed);
byte[] buffer = new byte[val1 + seed.Length];
Array.Copy(hash1, buffer, hash1.Length);
Array.Copy(seed, 0, buffer, hash1.Length, seed.Length);
byte[] numArray = new byte[length];
int destinationIndex = 0;
while (destinationIndex < length)
{
byte[] hash2 = hmac.ComputeHash(buffer);
int length1 = Math.Min(val1, length - destinationIndex);
Array.Copy(hash2, 0, numArray, destinationIndex, length1);
destinationIndex += length1;
hash1 = hmac.ComputeHash(hash1);
Array.Copy(hash1, buffer, hash1.Length);
}
return(numArray);
}
