// key, if not present.
		kmsCtx := kms.Context{}
		for k, v := range cryptoCtx {
			kmsCtx[k] = v
		}
		if _, ok := kmsCtx[bucket]; !ok {
			kmsCtx[bucket] = path.Join(bucket, object)
		}
		newKey, err := GlobalKMS.GenerateKey(ctx, &kms.GenerateKeyRequest{
			Name:           newKeyID,
			AssociatedData: kmsCtx,
		})
		if err != nil {
			return err
		}

	case crypto.S3KMS:
		w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionKMS)
		w.Header().Set(xhttp.AmzServerSideEncryptionKmsID, objInfo.KMSKeyID())
		if kmsCtx, ok := objInfo.UserDefined[crypto.MetaContext]; ok {
			w.Header().Set(xhttp.AmzServerSideEncryptionKmsContext, kmsCtx)
		}
	case crypto.SSEC:
		// Validate the SSE-C Key set in the header.

			reader io.Reader
			keyID  string
			key    []byte
			kmsCtx kms.Context
		)
		kind, _ := crypto.IsRequested(formValues)
		switch kind {
		case crypto.SSEC:
			key, err = ParseSSECustomerHeader(formValues)
			if err != nil {
				writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
				return
			}
		case crypto.S3KMS:
			keyID, kmsCtx, err = crypto.S3KMS.ParseHTTP(formValues)
			if err != nil {

	case crypto.S3KMS:
		m[xhttp.AmzServerSideEncryption] = xhttp.AmzEncryptionKMS
		m[xhttp.AmzServerSideEncryptionKmsID] = kmsKeyIDFromMetadata(metadata)
		if kmsCtx, ok := metadata[crypto.MetaContext]; ok {
			m[xhttp.AmzServerSideEncryptionKmsContext] = kmsCtx
		}
	case crypto.SSEC:
		m[xhttp.AmzServerSideEncryptionCustomerAlgorithm] = xhttp.AmzEncryptionAES

	}

	var toRemove []string

		case crypto.S3KMS:
			w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionKMS)
			w.Header().Set(xhttp.AmzServerSideEncryptionKmsID, mi.KMSKeyID())
			if kmsCtx, ok := mi.UserDefined[crypto.MetaContext]; ok {
				w.Header().Set(xhttp.AmzServerSideEncryptionKmsContext, kmsCtx)
			}
			if len(etag) >= 32 && strings.Count(etag, "-") != 1 {
				etag = etag[len(etag)-32:]
			}
		case crypto.S3: