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keys.go
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keys.go
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package activitypub
import (
"crypto"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/writeas/openssl-go"
"log"
)
const keyBitSize = 2048
// GenerateKeys creates an RSA keypair and returns the public and private key,
// in that order.
func GenerateKeys() (pubPEM []byte, privPEM []byte) {
var err error
privPEM, err = openssl.Call(nil, "genrsa", fmt.Sprintf("%d", keyBitSize))
if err != nil {
log.Printf("Unable to generate private key: %v", err)
return nil, nil
}
pubPEM, err = openssl.Call(privPEM, "rsa", "-in", "/dev/stdin", "-pubout")
if err != nil {
log.Printf("Unable to get public key: %v", err)
return nil, nil
}
return
}
func parsePrivateKey(der []byte) (crypto.PrivateKey, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey:
return key, nil
default:
return nil, fmt.Errorf("found unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, nil
}
return nil, fmt.Errorf("failed to parse private key")
}
func parsePublicKey(der []byte) (crypto.PublicKey, error) {
if key, err := x509.ParsePKCS1PublicKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKIXPublicKey(der); err == nil {
switch key := key.(type) {
case *rsa.PublicKey:
return key, nil
default:
return nil, fmt.Errorf("found unknown public key type in PKIX wrapping")
}
}
return nil, fmt.Errorf("failed to parse public key")
}
// DecodePrivateKey encodes public and private key to PEM format, returning
// them in that order.
func DecodePrivateKey(k []byte) (crypto.PrivateKey, error) {
block, _ := pem.Decode(k)
if block == nil || (block.Type != "RSA PRIVATE KEY" && block.Type != "PRIVATE KEY") {
return nil, fmt.Errorf("failed to decode PEM block containing private key, type %s", block.Type)
}
return parsePrivateKey(block.Bytes)
}
// DecodePublicKey decodes public keys
func DecodePublicKey(k []byte) (crypto.PublicKey, error) {
block, _ := pem.Decode(k)
if block == nil || block.Type != "PUBLIC KEY" {
if block != nil {
return nil, fmt.Errorf("failed to decode PEM block containing public key. type: %v", block.Type)
} else {
return nil, fmt.Errorf("failed to decode PEM block containing public key.")
}
}
return parsePublicKey(block.Bytes)
}

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