Source file src/github.com/MicahParks/keyfunc/eddsa.go

Documentation: github.com/MicahParks/keyfunc

     1  package keyfunc
     2  
     3  import (
     4  	"crypto/ed25519"
     5  	"fmt"
     6  )
     7  
     8  const (
     9  	// ktyEC is the key type (kty) in the JWT header for EdDSA.
    10  	ktyOKP = "OKP"
    11  )
    12  
    13  // EdDSA parses a jsonWebKey and turns it into a EdDSA public key.
    14  func (j *jsonWebKey) EdDSA() (publicKey ed25519.PublicKey, err error) {
    15  	if j.X == "" {
    16  		return nil, fmt.Errorf("%w: %s", ErrMissingAssets, ktyOKP)
    17  	}
    18  
    19  	// Decode the public key from Base64.
    20  	//
    21  	// According to RFC 8037, this is from Base64 URL bytes.
    22  	// https://datatracker.ietf.org/doc/html/rfc8037#appendix-A.2
    23  	publicBytes, err := base64urlTrailingPadding(j.X)
    24  	if err != nil {
    25  		return nil, err
    26  	}
    27  
    28  	return publicBytes, nil
    29  }
    30  

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