void buildMessage()

in httpclient5/src/main/java/org/apache/hc/client5/http/impl/auth/NTLMEngineImpl.java [1619:1753]
67 lines of code
8 McCabe index (conditional complexity)

        void buildMessage() {
            final int ntRespLen = ntResp.length;
            final int lmRespLen = lmResp.length;

            final int domainLen = domainBytes != null ? domainBytes.length : 0;
            final int hostLen = hostBytes != null ? hostBytes.length : 0;
            final int userLen = userBytes.length;
            final int sessionKeyLen;
            if (sessionKey != null) {
                sessionKeyLen = sessionKey.length;
            } else {
                sessionKeyLen = 0;
            }

            // Calculate the layout within the packet
            final int lmRespOffset = 72 + // allocate space for the version
                ( computeMic ? 16 : 0 ); // and MIC
            final int ntRespOffset = lmRespOffset + lmRespLen;
            final int domainOffset = ntRespOffset + ntRespLen;
            final int userOffset = domainOffset + domainLen;
            final int hostOffset = userOffset + userLen;
            final int sessionKeyOffset = hostOffset + hostLen;
            final int finalLength = sessionKeyOffset + sessionKeyLen;

            // Start the response. Length includes signature and type
            prepareResponse(finalLength, 3);

            // LM Resp Length (twice)
            addUShort(lmRespLen);
            addUShort(lmRespLen);

            // LM Resp Offset
            addULong(lmRespOffset);

            // NT Resp Length (twice)
            addUShort(ntRespLen);
            addUShort(ntRespLen);

            // NT Resp Offset
            addULong(ntRespOffset);

            // Domain length (twice)
            addUShort(domainLen);
            addUShort(domainLen);

            // Domain offset.
            addULong(domainOffset);

            // User Length (twice)
            addUShort(userLen);
            addUShort(userLen);

            // User offset
            addULong(userOffset);

            // Host length (twice)
            addUShort(hostLen);
            addUShort(hostLen);

            // Host offset
            addULong(hostOffset);

            // Session key length (twice)
            addUShort(sessionKeyLen);
            addUShort(sessionKeyLen);

            // Session key offset
            addULong(sessionKeyOffset);

            // Flags.
            addULong(
                    /*
                    //FLAG_WORKSTATION_PRESENT |
                    //FLAG_DOMAIN_PRESENT |

                    // Required flags
                    (type2Flags & FLAG_REQUEST_LAN_MANAGER_KEY) |
                    (type2Flags & FLAG_REQUEST_NTLMv1) |
                    (type2Flags & FLAG_REQUEST_NTLM2_SESSION) |

                    // Protocol version request
                    FLAG_REQUEST_VERSION |

                    // Recommended privacy settings
                    (type2Flags & FLAG_REQUEST_ALWAYS_SIGN) |
                    (type2Flags & FLAG_REQUEST_SEAL) |
                    (type2Flags & FLAG_REQUEST_SIGN) |

                    // These must be set according to documentation, based on use of SEAL above
                    (type2Flags & FLAG_REQUEST_128BIT_KEY_EXCH) |
                    (type2Flags & FLAG_REQUEST_56BIT_ENCRYPTION) |
                    (type2Flags & FLAG_REQUEST_EXPLICIT_KEY_EXCH) |

                    (type2Flags & FLAG_TARGETINFO_PRESENT) |
                    (type2Flags & FLAG_REQUEST_UNICODE_ENCODING) |
                    (type2Flags & FLAG_REQUEST_TARGET)
                        */
                type2Flags
            );

            // Version
            addUShort(0x0105);
            // Build
            addULong(2600);
            // NTLM revision
            addUShort(0x0f00);

            int micPosition = -1;
            if ( computeMic ) {
                micPosition = currentOutputPosition;
                currentOutputPosition += 16;
            }

            // Add the actual data
            addBytes(lmResp);
            addBytes(ntResp);
            addBytes(domainBytes);
            addBytes(userBytes);
            addBytes(hostBytes);
            if (sessionKey != null) {
                addBytes(sessionKey);
            }

            // Write the mic back into its slot in the message

            if (computeMic) {
                // Computation of message integrity code (MIC) as specified in [MS-NLMP] section 3.2.5.1.2.
                final HMACMD5 hmacMD5 = new HMACMD5( exportedSessionKey );
                hmacMD5.update( type1Message );
                hmacMD5.update( type2Message );
                hmacMD5.update( messageContents );
                final byte[] mic = hmacMD5.getOutput();
                System.arraycopy( mic, 0, messageContents, micPosition, mic.length );
            }
        }