private static byte[] Sign(Smb2CryptoInfo cryptoInfo, Smb2SinglePacket original, Smb2Role role)
{
if (Smb2Utility.IsSmb2Family(cryptoInfo.Dialect))
{
// [MS-SMB2] 3.1.4.1
// 3. If Connection.Dialect is "2.002" or "2.100", the sender MUST compute a 32-byte hash using HMAC-SHA256 over the entire message,
HMACSHA256 hmacSha = new HMACSHA256(cryptoInfo.SigningKey);
return(hmacSha.ComputeHash(original.ToBytes()));
}
else if (cryptoInfo.SigningId == SigningAlgorithm.AES_GMAC)
{
// [MS-SMB2] 3.1.4.1
// 1. If Connection.Dialect belongs to the SMB 3.x dialect family and Connection.SigningAlgorithmId is AES-GMAC,
// compute a 16-byte hash using the AES-GMAC over the entire message using nonce as specified
var nonce = Smb2Utility.ComputeNonce(original, role);
var(_, tag) = AesGmac.ComputeHash(cryptoInfo.SigningKey, nonce, original.ToBytes());
return(tag);
}
else
{
// [MS-SMB2] 3.1.4.1
// 2. If Connection.Dialect belongs to the SMB 3.x dialect family, the sender MUST compute a 16-byte hash using AES-128-CMAC over the entire message
return(AesCmac128.ComputeHash(cryptoInfo.SigningKey, original.ToBytes()));
}
}
private static byte[] Sign(Smb2CryptoInfo cryptoInfo, byte[] original)
{
if (Smb2Utility.IsSmb2Family(cryptoInfo.Dialect))
{
// [MS-SMB2] 3.1.4.1
// 3. If Connection.Dialect is "2.002" or "2.100", the sender MUST compute a 32-byte hash using HMAC-SHA256 over the entire message,
HMACSHA256 hmacSha = new HMACSHA256(cryptoInfo.SigningKey);
return(hmacSha.ComputeHash(original));
}
else
{
// [MS-SMB2] 3.1.4.1
// 2. If Connection.Dialect belongs to the SMB 3.x dialect family, the sender MUST compute a 16-byte hash using AES-128-CMAC over the entire message
return(AesCmac128.ComputeHash(cryptoInfo.SigningKey, original));
}
}
public static void SignByteArray(Smb2CryptoInfo cryptoInfo, byte[] original, out byte[] nonce, out byte[] signature, Smb2Role role, Smb2Command smb2Command, UInt64 messageId = 1)
{
if (Smb2Utility.IsSmb2Family(cryptoInfo.Dialect))
{
// [MS-SMB2] 3.1.4.1
// 3. If Connection.Dialect is "2.02" or "2.1", the sender MUST compute a 32-byte hash using HMAC-SHA256 over the entire message,
HMACSHA256 hmacSha = new HMACSHA256(cryptoInfo.SigningKey);
signature = hmacSha.ComputeHash(original);
nonce = Array.Empty <byte>();
}
else if (Smb2Utility.IsSmb3xFamily(cryptoInfo.Dialect))
{
if (cryptoInfo.SigningId == SigningAlgorithm.AES_GMAC)
{
// [MS-SMB2] 3.1.4.1
// 1. If Connection.Dialect belongs to the SMB 3.x dialect family and Connection.SigningAlgorithmId is AES-GMAC,
// compute a 16-byte hash using the AES-GMAC over the entire message using nonce as specified
nonce = Smb2Utility.ComputeNonce(messageId, role, smb2Command);
var(_, tag) = AesGmac.ComputeHash(cryptoInfo.SigningKey, nonce, original);
signature = tag;
}
else
{
// [MS-SMB2] 3.1.4.1
// 2. If Connection.Dialect belongs to the SMB 3.x dialect family, the sender MUST compute a 16-byte hash using AES-128-CMAC over the entire message
signature = AesCmac128.ComputeHash(cryptoInfo.SigningKey, original);
nonce = Array.Empty <byte>();
}
}
else
{
nonce = Array.Empty <byte>();
signature = Array.Empty <byte>();
}
}
