Ejemplo n.º 1
0
        public static byte[] GenerateClientDecryptionKey(byte[] sessionKey, SMB2Dialect dialect, byte[] preauthIntegrityHashValue)
        {
            if (dialect == SMB2Dialect.SMB311 && preauthIntegrityHashValue == null)
            {
                throw new ArgumentNullException(nameof(preauthIntegrityHashValue));
            }

            string labelString = (dialect == SMB2Dialect.SMB311) ? "SMBS2CCipherKey" : "SMB2AESCCM";

            byte[] label   = GetNullTerminatedAnsiString(labelString);
            byte[] context = (dialect == SMB2Dialect.SMB311) ? preauthIntegrityHashValue : GetNullTerminatedAnsiString("ServerOut");

            using HMACSHA256 hmac = new HMACSHA256(sessionKey);
            return(SP800_1008.DeriveKey(hmac, label, context, 128));
        }
Ejemplo n.º 2
0
        public static byte[] GenerateSigningKey(byte[] sessionKey, SMB2Dialect dialect, byte[]?preauthIntegrityHashValue)
        {
            if (dialect == SMB2Dialect.SMB202 || dialect == SMB2Dialect.SMB210)
            {
                return(sessionKey);
            }

            if (dialect == SMB2Dialect.SMB311 && preauthIntegrityHashValue == null)
            {
                throw new ArgumentNullException(nameof(preauthIntegrityHashValue));
            }

            string labelString = (dialect == SMB2Dialect.SMB311) ? "SMBSigningKey" : "SMB2AESCMAC";

            byte[] label   = GetNullTerminatedAnsiString(labelString);
            byte[] context = (dialect == SMB2Dialect.SMB311) ? preauthIntegrityHashValue ! : GetNullTerminatedAnsiString("SmbSign");

            using HMACSHA256 hmac = new HMACSHA256(sessionKey);
            return(SP800_1008.DeriveKey(hmac, label, context, 128));
        }