public void Reset()
{
SecurityAssert.SAssert(state != HMACState.Uninitialised);
var iPadKey = XorKey(key, 0x36);
digest.Reset();
digest.Update(iPadKey, 0, iPadKey.Length);
state = HMACState.InnerHashing;
}
public void Reset()
{
SecurityAssert.Assert(_state != HMACState.Uninitialised);
var iPadKey = XorKey(_key, 0x36);
_digest.Reset();
_digest.Update(iPadKey);
_state = HMACState.InnerHashing;
}
public HMAC(IDigest digest, byte[] key)
{
SecurityAssert.NotNull(digest);
SecurityAssert.NotNull(key);
_digest = digest;
_key = new byte[digest.BlockSize / 8];
_state = HMACState.Uninitialised;
ProcessInputKey(key);
_state = HMACState.ProcessedKey;
Reset();
}
public HMAC(IDigest digest, byte[] key)
{
SecurityAssert.NotNull(digest);
SecurityAssert.NotNull(key);
this.digest = digest;
this.key = new byte[digest.BlockSize / 8];
ProcessInputKey(key);
state = HMACState.ProcessedKey;
Reset();
}
public byte[] Digest()
{
SecurityAssert.SAssert(state == HMACState.InnerHashing);
state = HMACState.HashingDone;
var innerHash = digest.Digest();
var oPadKey = XorKey(key, 0x5c);
digest.Reset();
digest.Update(oPadKey, 0, oPadKey.Length);
digest.Update(innerHash, 0, innerHash.Length);
return digest.Digest();
}
public void Digest(Span <byte> output)
{
SecurityAssert.Assert(_state == HMACState.InnerHashing);
_state = HMACState.HashingDone;
var innerHash = _digest.DigestBuffer();
var oPadKey = XorKey(_key, 0x5c);
_digest.Reset();
_digest.Update(oPadKey);
_digest.Update(innerHash);
_digest.Digest(output);
}
private void ProcessInputKey(byte[] bytes)
{
var blockLength = _digest.BlockSize / 8;
if (bytes.Length > blockLength)
{
_state = HMACState.Uninitialised;
_digest.Reset();
_digest.Update(bytes);
_digest.Digest(_key.AsSpan());
}
else
{
Array.Copy(bytes, _key, bytes.Length);
}
}
private void ProcessInputKey(byte[] bytes)
{
var blockLength = digest.BlockSize / 8;
if (bytes.Length > blockLength)
{
state = HMACState.Uninitialised;
digest.Reset();
digest.Update(bytes, 0, bytes.Length);
var keyHash = digest.Digest();
Array.Copy(keyHash, key, keyHash.Length);
}
else
{
Array.Copy(bytes, key, bytes.Length);
}
}
