protected override void GenerateEncryptedUploadPartRequest()

in src/Internal/SetupEncryptionHandlerV1.cs [130:157]
23 lines of code
4 McCabe index (conditional complexity)

        protected override void GenerateEncryptedUploadPartRequest(UploadPartRequest request)
        {
            string uploadID = request.UploadId;

            UploadPartEncryptionContext contextForEncryption = this.EncryptionClient.CurrentMultiPartUploadKeys[uploadID];
            byte[] envelopeKey = contextForEncryption.EnvelopeKey;
            byte[] IV = contextForEncryption.NextIV;

            EncryptionInstructions instructions = new EncryptionInstructions(EncryptionMaterials.MaterialsDescription, envelopeKey, IV);

            if (!request.IsLastPart)
            {
                if (contextForEncryption.IsFinalPart)
                    throw new AmazonClientException("Last part has already been processed, cannot upload this as the last part");

                if (request.PartNumber < contextForEncryption.PartNumber)
                    throw new AmazonClientException($"Upload Parts must be in correct sequence. Request part number {request.PartNumber} must be >= to {contextForEncryption.PartNumber}");

                request.InputStream = EncryptionUtils.EncryptUploadPartRequestUsingInstructions(request.InputStream, instructions);
                contextForEncryption.PartNumber = request.PartNumber;
            }
            else
            {
                request.InputStream = EncryptionUtils.EncryptRequestUsingInstruction(request.InputStream, instructions);
                contextForEncryption.IsFinalPart = true;
            }
            ((Amazon.Runtime.Internal.IAmazonWebServiceRequest)request).RequestState.Add(Constants.S3CryptoStreamRequestState, request.InputStream);
        }