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read_key.go
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read_key.go
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package jwt
import (
"crypto/rand"
"crypto/rsa"
"errors"
"os"
)
var (
ErrNoPrivKeyFile = errors.New("private key file unreadable")
ErrInvalidPrivKey = errors.New("RSA private key invalid")
ErrNoPubKeyFile = errors.New("public key file unreadable")
ErrInvalidPubKey = errors.New("RSA public key invalid")
)
func GetKey(key string) ([]byte, error) {
if _, err := os.Stat(key); err == nil {
return os.ReadFile(key)
}
return []byte(key), nil
}
func GetRSAPrivateKey(key string) (*rsa.PrivateKey, error) {
if key == "" {
return rsa.GenerateKey(rand.Reader, 4096)
}
prv, err := GetKey(key)
if err != nil {
return nil, ErrNoPrivKeyFile
}
prvKey, err := ParseRSAPrivateKeyFromPEM(prv)
if err != nil {
return nil, ErrInvalidPrivKey
}
return prvKey, nil
}
func GetRSAPublicKey(key string) (*rsa.PublicKey, error) {
pub, err := GetKey(key)
if err != nil {
return nil, ErrNoPubKeyFile
}
pubKey, err := ParseRSAPublicKeyFromPEM(pub)
if err != nil {
return nil, ErrInvalidPubKey
}
return pubKey, nil
}