func getPublicKeyInfo()

in certViewer/cmd/web/certificates.go [340:393]

• 42 lines of code
• 8 McCabe index (conditional complexity)

func getPublicKeyInfo(cert *x509.Certificate) (SubjectPublicKeyInfo, error) {
	pubInfo := SubjectPublicKeyInfo{
		Alg: PublicKeyAlgorithm[cert.PublicKeyAlgorithm],
	}

	switch pub := cert.PublicKey.(type) {
	case *rsa.PublicKey:
		pubInfo.Size = float64(pub.N.BitLen())
		pubInfo.Exponent = float64(pub.E)

	case *dsa.PublicKey:
		pubInfo.Size = float64(pub.Y.BitLen())
		textInt, err := pub.G.MarshalText()

		if err == nil {
			pubInfo.G = string(textInt)
		} else {
			return pubInfo, err
		}

		textInt, err = pub.P.MarshalText()

		if err == nil {
			pubInfo.P = string(textInt)
		} else {
			return pubInfo, err
		}

		textInt, err = pub.Q.MarshalText()

		if err == nil {
			pubInfo.Q = string(textInt)
		} else {
			return pubInfo, err
		}

		textInt, err = pub.Y.MarshalText()

		if err == nil {
			pubInfo.Y = string(textInt)
		} else {
			return pubInfo, err
		}

	case *ecdsa.PublicKey:
		pubInfo.Size = float64(pub.Curve.Params().BitSize)
		pubInfo.Curve = pub.Curve.Params().Name
		pubInfo.Y = pub.Y.String()
		pubInfo.X = pub.X.String()
	}

	return pubInfo, nil

}