const golang.org/x/crypto/openpgp/packet.SigTypePrimaryKeyBinding

2 uses

	golang.org/x/crypto/openpgp/packet (current package)
		packet.go#L428: 	SigTypePrimaryKeyBinding               = 0x19
		signature.go#L382: 		if sigType := sig.EmbeddedSignature.SigType; sigType != SigTypePrimaryKeyBinding {