private static void Blake2Tests()
{
const string input = "ABCD";
byte[] bytes = Encoding.UTF8.GetBytes(input);
using ProtectedMemory protectedMemory = ProtectedMemory.Allocate(bytes.Length);
protectedMemory.Write(bytes, 0);
Blake2bProtectedCryptoProvider blake2 = new Blake2bProtectedCryptoProvider();
Console.WriteLine(blake2.ComputeHash(protectedMemory));
}
public string Decrypt(ProtectedMemory key, string message)
{
Blake2bProtectedCryptoProvider blake2b = new Blake2bProtectedCryptoProvider();
using ProtectedMemory paddedKey = blake2b.ComputeHashProtected(key, 64);
ExtractHeader(message, paddedKey, out byte[] iv, out byte[] buffer);
using (ProtectedMemory aesKey = DeriveAesKey(paddedKey))
{
AesState aesState = new AesState(aesKey, iv);
aesState.AesCbcDecryptBuffer(ref buffer);
}
int contentLength = Pkcs7Padding.GetContentLength(buffer, 16);
return(Encoding.UTF8.GetString(buffer, 0, contentLength));
}
private unsafe ProtectedMemory DeriveAesKey(ProtectedMemory key)
{
using ProtectedMemory protectedBuffer = ProtectedMemory.Allocate(64);
key.CopyTo(0, protectedBuffer, 0, 64);
using (ProtectedMemoryAccess bufferAccess = new ProtectedMemoryAccess(protectedBuffer))
{
ulong *buffer = (ulong *)bufferAccess.Handle;
for (int i = 0; i < 64 / sizeof(ulong); i++)
{
buffer[i] ^= 0x36;
}
}
Blake2bProtectedCryptoProvider blake2b = new Blake2bProtectedCryptoProvider();
return(blake2b.ComputeHashProtected(protectedBuffer, 32));
}
public ProtectedMemory DecryptProtected(ProtectedMemory key, string message)
{
Blake2bProtectedCryptoProvider blake2b = new Blake2bProtectedCryptoProvider();
using ProtectedMemory paddedKey = blake2b.ComputeHashProtected(key, 64);
ExtractHeader(message, paddedKey, out byte[] iv, out byte[] messageBytes);
using ProtectedMemory protectedBuffer = ProtectedMemory.Allocate(messageBytes.Length);
protectedBuffer.Write(messageBytes, 0, messageBytes.Length);
using (ProtectedMemory aesKey = DeriveAesKey(paddedKey))
{
AesState aesState = new AesState(aesKey, iv);
aesState.AesCbcDecryptBuffer(protectedBuffer);
}
int contentLength = Pkcs7Padding.GetContentLength(protectedBuffer, 16);
ProtectedMemory result = ProtectedMemory.Allocate(contentLength);
protectedBuffer.CopyTo(0, result, 0, contentLength);
return(result);
}
private static void Blake2PerfTest()
{
byte[] bytes = Encoding.UTF8.GetBytes("Lorem ipsum dolor sit amet, consectetur adipiscing elit.");
using ProtectedMemory protectedMemory = ProtectedMemory.Allocate(bytes.Length);
protectedMemory.Write(bytes, 0);
Blake2bProtectedCryptoProvider blake2 = new Blake2bProtectedCryptoProvider();
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
for (int i = 0; i < 1000000; i++)
{
_ = blake2.ComputeHash(protectedMemory);
}
stopwatch.Stop();
Console.WriteLine("1000000 hashes done in " + stopwatch.Elapsed.ToString());
double t = stopwatch.ElapsedMilliseconds / 1000000d;
Console.WriteLine(" * " + t.ToString() + " ms per digest.");
Console.WriteLine(" * " + (1000d / t).ToString() + " hashes per second.");
}