Golang RSA key pair string and PEM generator

keypair.go

package utils

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/base64"
	"encoding/pem"
)

type KeyPair struct {
	public  []byte
	private []byte
}

func (keyPair *KeyPair) GetPublic() string {
	return base64.StdEncoding.EncodeToString(keyPair.public)
}

func (keyPair *KeyPair) GetPrivate() string {
	return base64.StdEncoding.EncodeToString(keyPair.private)
}

func (keyPair *KeyPair) GetPublicPEM() string {
	return string(pem.EncodeToMemory(
		&pem.Block{
			Type:  "RSA PUBLIC KEY",
			Bytes: keyPair.public,
		},
	))
}

func (keyPair *KeyPair) GetPrivatePEM() string {
	return string(pem.EncodeToMemory(
		&pem.Block{
			Type:  "RSA PRIVATE KEY",
			Bytes: keyPair.private,
		},
	))
}

func GenerateKeyPair() (*KeyPair, error) {
	key, err := rsa.GenerateKey(rand.Reader, 4096)

	if err != nil {
		return nil, err
	}

	return &KeyPair{
		private: x509.MarshalPKCS1PrivateKey(key),
		public:  x509.MarshalPKCS1PublicKey(key.Public().(*rsa.PublicKey)),
	}, nil
}