/
pkcs.go
55 lines (47 loc) · 1.31 KB
/
pkcs.go
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package pkcs
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
)
func generatePublicKey(w io.Writer, key *rsa.PrivateKey) error {
pkixPublicKey, err := x509.MarshalPKIXPublicKey(&key.PublicKey)
if err != nil {
return fmt.Errorf("cannot marshal the private key to PKIX: %w", err)
}
if err := pem.Encode(w, &pem.Block{
Type: "PUBLIC KEY",
Bytes: pkixPublicKey,
}); err != nil {
return fmt.Errorf("cannot encode the public key: %w", err)
}
return nil
}
func generatePrivateKey(w io.Writer, key *rsa.PrivateKey) error {
if err := pem.Encode(w, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}); err != nil {
return fmt.Errorf("cannot encode the private key: %w", err)
}
return nil
}
func GenerateKeys() (string, string, *rsa.PrivateKey, error) {
key, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return "", "", nil, fmt.Errorf("cannot generate a key pair: %w", err)
}
priv := &bytes.Buffer{}
pub := &bytes.Buffer{}
if err := generatePrivateKey(priv, key); err != nil {
return "", "", nil, fmt.Errorf("cannot generate public key : %s", err)
}
if err := generatePublicKey(pub, key); err != nil {
return "", "", nil, fmt.Errorf("cannot generate public key : %s", err)
}
return priv.String(), pub.String(), key, nil
}