protected bool KMSEnvelopeKeyIsPresent()

in src/Internal/SetupDecryptionHandler.cs [240:269]
26 lines of code
5 McCabe index (conditional complexity)

        protected bool KMSEnvelopeKeyIsPresent(IExecutionContext executionContext,
            out byte[] encryptedKMSEnvelopeKey, out Dictionary<string, string> encryptionContext)
        {
            var response = executionContext.ResponseContext.Response;
            var getObjectResponse = response as GetObjectResponse;
            encryptedKMSEnvelopeKey = null;
            encryptionContext = null;

            if (getObjectResponse != null)
            {
                var metadata = getObjectResponse.Metadata;
                EncryptionUtils.EnsureSupportedAlgorithms(metadata);

                var base64EncodedEncryptedKmsEnvelopeKey = metadata[EncryptionUtils.XAmzKeyV2];
                if (base64EncodedEncryptedKmsEnvelopeKey != null)
                {
                    var wrapAlgorithm = metadata[EncryptionUtils.XAmzWrapAlg];
                    if (!(EncryptionUtils.XAmzWrapAlgKmsContextValue.Equals(wrapAlgorithm) || EncryptionUtils.XAmzWrapAlgKmsValue.Equals(wrapAlgorithm)))
                    {
                        return false;
                    }

                    encryptedKMSEnvelopeKey = Convert.FromBase64String(base64EncodedEncryptedKmsEnvelopeKey);
                    encryptionContext = EncryptionUtils.GetMaterialDescriptionFromMetaData(metadata);

                    return true;
                }
            }
            return false;
        }