Here is a code sample that demonstrates encoding and decoding of keys in Go. It helps to know that you need to connect couple of steps. Crypto algorithm is the fist step, in this case ECDSA key. Then you need standard encoding, x509 is most commontly used standard. Finally you need a file format, PEM is again commonly used one. This is currently most commonly used combination, but feel free to substitute any other algoriths or encoding.
func encode(privateKey *ecdsa.PrivateKey, publicKey *ecdsa.PublicKey) (string, string) {
x509Encoded, _ := x509.MarshalECPrivateKey(privateKey)
pemEncoded := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded})
x509EncodedPub, _ := x509.MarshalPKIXPublicKey(publicKey)
pemEncodedPub := pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: x509EncodedPub})
return string(pemEncoded), string(pemEncodedPub)
}
func decode(pemEncoded string, pemEncodedPub string) (*ecdsa.PrivateKey, *ecdsa.PublicKey) {
block, _ := pem.Decode([]byte(pemEncoded))
x509Encoded := block.Bytes
privateKey, _ := x509.ParseECPrivateKey(x509Encoded)
blockPub, _ := pem.Decode([]byte(pemEncodedPub))
x509EncodedPub := blockPub.Bytes
genericPublicKey, _ := x509.ParsePKIXPublicKey(x509EncodedPub)
publicKey := genericPublicKey.(*ecdsa.PublicKey)
return privateKey, publicKey
}
func test() {
privateKey, _ := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
publicKey := &privateKey.PublicKey
encPriv, encPub := encode(privateKey, publicKey)
fmt.Println(encPriv)
fmt.Println(encPub)
priv2, pub2 := decode(encPriv, encPub)
if !reflect.DeepEqual(privateKey, priv2) {
fmt.Println("Private keys do not match.")
}
if !reflect.DeepEqual(publicKey, pub2) {
fmt.Println("Public keys do not match.")
}
}