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package jwt
import (
"crypto"
"crypto/ed25519"
"crypto/x509"
"encoding/pem"
"errors"
)
var (
ErrNotEdPrivateKey = errors.New("key is not a valid Ed25519 private key")
ErrNotEdPublicKey = errors.New("key is not a valid Ed25519 public key")
)
// ParseEdPrivateKeyFromPEM parses a PEM-encoded Edwards curve private key
func ParseEdPrivateKeyFromPEM(key []byte) (crypto.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
return nil, err
}
var pkey ed25519.PrivateKey
var ok bool
if pkey, ok = parsedKey.(ed25519.PrivateKey); !ok {
return nil, ErrNotEdPrivateKey
}
return pkey, nil
}
// ParseEdPublicKeyFromPEM parses a PEM-encoded Edwards curve public key
func ParseEdPublicKeyFromPEM(key []byte) (crypto.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
return nil, err
}
var pkey ed25519.PublicKey
var ok bool
if pkey, ok = parsedKey.(ed25519.PublicKey); !ok {
return nil, ErrNotEdPublicKey
}
return pkey, nil
}
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