slackhq/nebula · error

ErrInvalidPEMX25519PublicKeyBanner

ErrInvalidPEMX25519PublicKeyBanner

Error message

bytes did not contain a proper X25519 public key banner

What it means

Sentinel error for an invalid X25519 public key PEM banner: the input decoded as PEM but its block type is not the expected X25519 public key banner, so unmarshalling a raw public key aborts. The bytes are a PEM block of the wrong kind (e.g. a certificate or private key banner passed where a public key was required).

Source

Thrown at cert/errors.go:29

	ErrExpired                    = errors.New("certificate is expired")
	ErrNotCA                      = errors.New("certificate is not a CA")
	ErrNotSelfSigned              = errors.New("certificate is not self-signed")
	ErrBlockListed                = errors.New("certificate is in the block list")
	ErrFingerprintMismatch        = errors.New("certificate fingerprint did not match")
	ErrSignatureMismatch          = errors.New("certificate signature did not match")
	ErrInvalidPublicKey           = errors.New("invalid public key")
	ErrInvalidPrivateKey          = errors.New("invalid private key")
	ErrPublicPrivateCurveMismatch = errors.New("public key does not match private key curve")
	ErrPublicPrivateKeyMismatch   = errors.New("public key and private key are not a pair")
	ErrPrivateKeyEncrypted        = errors.New("private key must be decrypted")
	ErrCaNotFound                 = errors.New("could not find ca for the certificate")
	ErrUnknownVersion             = errors.New("certificate version unrecognized")
	ErrCertPubkeyPresent          = errors.New("certificate has unexpected pubkey present")
	ErrCurveMismatch              = errors.New("certificate curve does not match CA")

	ErrInvalidPEMBlock                   = errors.New("input did not contain a valid PEM encoded block")
	ErrInvalidPEMCertificateBanner       = errors.New("bytes did not contain a proper certificate banner")
	ErrInvalidPEMX25519PublicKeyBanner   = errors.New("bytes did not contain a proper X25519 public key banner")
	ErrInvalidPEMX25519PrivateKeyBanner  = errors.New("bytes did not contain a proper X25519 private key banner")
	ErrInvalidPEMEd25519PublicKeyBanner  = errors.New("bytes did not contain a proper Ed25519 public key banner")
	ErrInvalidPEMEd25519PrivateKeyBanner = errors.New("bytes did not contain a proper Ed25519 private key banner")

	ErrNoPeerStaticKey = errors.New("no peer static key was present")
	ErrNoPayload       = errors.New("provided payload was empty")

	ErrMissingDetails  = errors.New("certificate did not contain details")
	ErrEmptySignature  = errors.New("empty signature")
	ErrEmptyRawDetails = errors.New("empty rawDetails not allowed")
)

type ErrInvalidCertificateProperties struct {
	str string
}

func NewErrInvalidCertificateProperties(format string, a ...any) error {
	return &ErrInvalidCertificateProperties{fmt.Sprintf(format, a...)}

View on GitHub (pinned to dd8f660c0a)

Solutions

1. Supply the correct public key PEM produced by nebula-cert keygen
2. Check that the pub file wasn't confused with a cert or key file

When it happens

Trigger: Thrown at cert/errors.go:29 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of slackhq/nebula@dd8f660c0a (2026-09-03). Data as JSON: /api/errors/88a2da4d7853304b. Report an issue: GitHub.