niki/vendor/github.com/golang-jwt/jwt/v4/ed25519_utils.go

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

}