ed25519_utils.go

Documentation: github.com/golang-jwt/jwt/v5

     1  package jwt
     2  
     3  import (
     4  	"crypto"
     5  	"crypto/ed25519"
     6  	"crypto/x509"
     7  	"encoding/pem"
     8  	"errors"
     9  )
    10  
    11  var (
    12  	ErrNotEdPrivateKey = errors.New("key is not a valid Ed25519 private key")
    13  	ErrNotEdPublicKey  = errors.New("key is not a valid Ed25519 public key")
    14  )
    15  
    16  // ParseEdPrivateKeyFromPEM parses a PEM-encoded Edwards curve private key
    17  func ParseEdPrivateKeyFromPEM(key []byte) (crypto.PrivateKey, error) {
    18  	var err error
    19  
    20  	// Parse PEM block
    21  	var block *pem.Block
    22  	if block, _ = pem.Decode(key); block == nil {
    23  		return nil, ErrKeyMustBePEMEncoded
    24  	}
    25  
    26  	// Parse the key
    27  	var parsedKey interface{}
    28  	if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
    29  		return nil, err
    30  	}
    31  
    32  	var pkey ed25519.PrivateKey
    33  	var ok bool
    34  	if pkey, ok = parsedKey.(ed25519.PrivateKey); !ok {
    35  		return nil, ErrNotEdPrivateKey
    36  	}
    37  
    38  	return pkey, nil
    39  }
    40  
    41  // ParseEdPublicKeyFromPEM parses a PEM-encoded Edwards curve public key
    42  func ParseEdPublicKeyFromPEM(key []byte) (crypto.PublicKey, error) {
    43  	var err error
    44  
    45  	// Parse PEM block
    46  	var block *pem.Block
    47  	if block, _ = pem.Decode(key); block == nil {
    48  		return nil, ErrKeyMustBePEMEncoded
    49  	}
    50  
    51  	// Parse the key
    52  	var parsedKey interface{}
    53  	if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
    54  		return nil, err
    55  	}
    56  
    57  	var pkey ed25519.PublicKey
    58  	var ok bool
    59  	if pkey, ok = parsedKey.(ed25519.PublicKey); !ok {
    60  		return nil, ErrNotEdPublicKey
    61  	}
    62  
    63  	return pkey, nil
    64  }
    65
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