public static void ResignExecutable(MachObjectFile file, string bundleIdentifier, List <X509Certificate> certificateChain, AsymmetricKeyEntry privateKey, byte[] infoFileBytes, byte[] codeResourcesBytes, EntitlementsFile entitlements)
        {
            X509Certificate signingCertificate = certificateChain[certificateChain.Count - 1];
            string          certificateCN      = CertificateHelper.GetCertificateCommonName(signingCertificate);
            string          teamID             = CertificateHelper.GetCertificateOrganizationalUnit(signingCertificate);

            SegmentCommand linkEditSegment = SegmentCommandHelper.FindLinkEditSegment(file.LoadCommands);

            if (linkEditSegment == null)
            {
                throw new InvalidDataException("LinkEdit segment was not found");
            }

            if (file.LoadCommands[file.LoadCommands.Count - 1].CommandType != LoadCommandType.CodeSignature)
            {
                throw new NotImplementedException("The last LoadCommand entry is not CodeSignature");
            }

            CodeSignatureCommand command = (CodeSignatureCommand)file.LoadCommands[file.LoadCommands.Count - 1];
            int codeLength = (int)command.DataOffset;
            CodeDirectoryBlob codeDirectory         = CreateCodeDirectoryBlob(codeLength, bundleIdentifier, teamID, HashType.SHA1);
            AttributeTable    signedAttributesTable = null;

#if ALT_CODE_DIRECTORY_SHA256
            CodeDirectoryBlob alternativeCodeDirectory1 = CreateCodeDirectoryBlob(codeLength, bundleIdentifier, teamID, HashType.SHA256);
            signedAttributesTable = GenerateSignedAttributesTable(codeDirectory.GetBytes(), alternativeCodeDirectory1.GetBytes());
#endif
            CodeRequirementsBlob codeRequirements = CreateCodeRequirementsBlob(bundleIdentifier, certificateCN);
            EntitlementsBlob     entitlementsBlob = CreateEntitlementsBlob(entitlements);
            CmsSignatureBlob     cmsSignature     = new CmsSignatureBlob();
            // We create a dummy signature to determine the length required
            cmsSignature.Data = CMSHelper.GenerateSignature(certificateChain, privateKey, codeDirectory.GetBytes(), signedAttributesTable);

            CodeSignatureSuperBlob codeSignature = new CodeSignatureSuperBlob();
            codeSignature.Entries.Add(CodeSignatureEntryType.CodeDirectory, codeDirectory);
            codeSignature.Entries.Add(CodeSignatureEntryType.Requirements, codeRequirements);
            codeSignature.Entries.Add(CodeSignatureEntryType.Entitlements, entitlementsBlob);
#if ALT_CODE_DIRECTORY_SHA256
            codeSignature.Entries.Add(CodeSignatureEntryType.AlternateCodeDirectory1, alternativeCodeDirectory1);
#endif
            codeSignature.Entries.Add(CodeSignatureEntryType.CmsSignature, cmsSignature);

            command.DataSize = (uint)codeSignature.Length;
            uint finalFileSize = command.DataOffset + command.DataSize;
            SegmentCommandHelper.SetEndOffset(linkEditSegment, finalFileSize);

            byte[] codeToHash = ByteReader.ReadBytes(file.GetBytes(), 0, codeLength);
            UpdateSpecialHashes(codeDirectory, codeToHash, infoFileBytes, codeRequirements, codeResourcesBytes, entitlementsBlob);
#if ALT_CODE_DIRECTORY_SHA256
            UpdateSpecialHashes(alternativeCodeDirectory1, codeToHash, infoFileBytes, codeRequirements, codeResourcesBytes, entitlementsBlob);
            signedAttributesTable = GenerateSignedAttributesTable(codeDirectory.GetBytes(), alternativeCodeDirectory1.GetBytes());
#endif
            cmsSignature.Data = CMSHelper.GenerateSignature(certificateChain, privateKey, codeDirectory.GetBytes(), signedAttributesTable);

            // Store updated code signature:
            byte[] codeSignatureBytes = codeSignature.GetBytes();
            Array.Resize <byte>(ref file.Data, (codeLength - file.DataOffset) + (int)command.DataSize);
            ByteWriter.WriteBytes(file.Data, (int)command.DataOffset - file.DataOffset, codeSignatureBytes);
        }
        public static bool ValidateExecutableSignature(MachObjectFile file, X509Certificate certificate)
        {
            byte[] codeSignatureBytes = file.GetCodeSignatureBytes();
            if (CodeSignatureSuperBlob.IsCodeSignatureSuperBlob(codeSignatureBytes, 0))
            {
                CodeSignatureSuperBlob codeSignature = new CodeSignatureSuperBlob(codeSignatureBytes, 0);

                CodeDirectoryBlob codeDirectory = codeSignature.GetEntry(CodeSignatureEntryType.CodeDirectory) as CodeDirectoryBlob;
                CmsSignatureBlob  cmsSignature  = codeSignature.GetEntry(CodeSignatureEntryType.CmsSignature) as CmsSignatureBlob;
                if (codeDirectory == null || cmsSignature == null)
                {
                    return(false);
                }

                return(CMSHelper.ValidateSignature(codeDirectory.GetBytes(), cmsSignature.Data, certificate));
            }

            return(false);
        }