key's handle isn't an ECDSA/ECDH public/private key

Error message

key's handle isn't an ECDSA/ECDH public/private key

What it means

Error "key's handle isn't an ECDSA/ECDH public/private key" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/webcrypto/jwk.go:205

		if err != nil {
			return nil, fmt.Errorf("failed to convert ECDH key to ECDSA key: %w", err)
		}

		x = ecdsaKey.X
		y = ecdsaKey.Y
		d = ecdsaKey.D
		curveParams = ecdsaKey.Params()
	case *ecdh.PublicKey:
		ecdsaKey, err := convertPublicECDHtoECDSA(k)
		if err != nil {
			return nil, fmt.Errorf("failed to convert ECDH key to ECDSA key: %w", err)
		}

		x = ecdsaKey.X
		y = ecdsaKey.Y
		curveParams = ecdsaKey.Params()
	default:
		return nil, errors.New("key's handle isn't an ECDSA/ECDH public/private key")
	}

	exported.Set("crv", curveParams.Name)
	curveBits := curveParams.BitSize

	exported.Set("x", base64URLEncode(x.Bytes()))
	exported.Set("y", base64URLEncode(y.Bytes()))

	if d != nil {
		exported.Set("d", encodeCurveBigInt(d, curveBits))
	}

	return exported, nil
}

func importECDSAJWK(_ EllipticCurveKind, jsonKeyData []byte) (any, CryptoKeyType, error) {
	var jwkKey ecJWK
	if err := json.Unmarshal(jsonKeyData, &jwkKey); err != nil {

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/webcrypto/jwk.go:205 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/d58e891bae318b31. Report an issue: GitHub.