func (key *JWKS) DecodePublicKey() (crypto.PublicKey, error) {
	switch key.Kty {
	case "RSA":
		if key.N == "" || key.E == "" {
			return nil, errMalformedJWKRSAKey
		}

		// decode exponent
		ebuf, err := base64.RawURLEncoding.DecodeString(key.E)
		if err != nil {
			return nil, errMalformedJWKRSAKey
		}

		nbuf, err := base64.RawURLEncoding.DecodeString(key.N)
		if err != nil {

	if err != nil {
		c.Fatalf("export %d: Unable to export IAM: %v", caseNum, err)
	}
	defer contentReader.Close()

	expContent, err := io.ReadAll(contentReader)
	if err != nil {
		c.Fatalf("export %d: Unable to read exported content: %v", caseNum, err)
	}

	return expContent
}

type dummyCloser struct {
	io.Reader
}

func (d dummyCloser) Close() error { return nil }

	// Convert as if by ES6 number to string conversion.
	// This matches most other JSON generators.
	// See golang.org/issue/6384 and golang.org/issue/14135.
	// Like fmt %g, but the exponent cutoffs are different
	// and exponents themselves are not padded to two digits.
	abs := math.Abs(f)
	fmt := byte('f')
	if abs != 0 {
		if abs < 1e-6 || abs >= 1e21 {
			fmt = 'e'
		}
	}