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rsa.go
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rsa.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package v1
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
)
type RSAKeys struct {
Pub []byte
Priv []byte
}
func GenerateRSAKeys() (*RSAKeys, error) {
bitSize := 4096
key, err := rsa.GenerateKey(rand.Reader, bitSize)
if err != nil {
return nil, fmt.Errorf("couldn't generate RSA keys: %w", err)
}
privateKey, err := toPrivatePKCS1Key(key)
if err != nil {
return nil, fmt.Errorf("couldn't extract private RSA key: %w", err)
}
publicKey, err := toPublicPKCS1Key(key)
if err != nil {
return nil, fmt.Errorf("couldn't extract public RSA key: %w", err)
}
return &RSAKeys{
Pub: publicKey,
Priv: privateKey,
}, nil
}
func toPrivatePKCS1Key(key *rsa.PrivateKey) ([]byte, error) {
privateKey := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
privateKeyBuffer := bytes.NewBuffer([]byte{})
err := pem.Encode(privateKeyBuffer, privateKey)
if err != nil {
return nil, fmt.Errorf("couldn't encode private RSA key: %w", err)
}
return privateKeyBuffer.Bytes(), nil
}
func toPublicPKCS1Key(key *rsa.PrivateKey) ([]byte, error) {
pubBytes, err := x509.MarshalPKIXPublicKey(&key.PublicKey)
if err != nil {
return nil, fmt.Errorf("couldn't marshal public RSA key: %w", err)
}
publicKey := &pem.Block{
Type: "PUBLIC KEY",
Bytes: pubBytes,
}
publicKeyBuffer := bytes.NewBuffer([]byte{})
err = pem.Encode(publicKeyBuffer, publicKey)
if err != nil {
return nil, fmt.Errorf("couldn't encode public RSA key: %w", err)
}
return publicKeyBuffer.Bytes(), nil
}