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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package activitypub
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
)
const rsaBits = 2048
// GenerateKeyPair generates a public and private keypair for signing actions by users for activitypub purposes
func GenerateKeyPair() (string, string, error) {
priv, _ := rsa.GenerateKey(rand.Reader, rsaBits)
privPem, err := pemBlockForPriv(priv)
if err != nil {
return "", "", err
}
pubPem, err := pemBlockForPub(&priv.PublicKey)
if err != nil {
return "", "", err
}
return privPem, pubPem, nil
}
func pemBlockForPriv(priv *rsa.PrivateKey) (string, error) {
privBytes := pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(priv),
})
return string(privBytes), nil
}
func pemBlockForPub(pub *rsa.PublicKey) (string, error) {
pubASN1, err := x509.MarshalPKIXPublicKey(pub)
if err != nil {
return "", err
}
pubBytes := pem.EncodeToMemory(&pem.Block{
Type: "PUBLIC KEY",
Bytes: pubASN1,
})
return string(pubBytes), nil
}
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