Function checkEvidenceKey

scripts/keymigrate/migrate.go:530–536

checkEvidenceKey reports whether a candidate key with one of the legacy evidence prefixes has the correct structure for a legacy evidence key. This check is needed because transaction hashes are stored without a prefix, so checking the one-byte prefix alone is not enough to distinguish them. Legacy

(key keyID)

// where the first element is the height and the second is the hash.  Thus, we
// check
func checkEvidenceKey(key keyID) bool {
	parts := bytes.SplitN(key[1:], []byte("/"), 2)
	if len(parts) != 2 || len(parts[0]) != 16 || !isHex(parts[0]) || !isHex(parts[1]) {
		return false
	}
	return true
}

func isHex(data []byte) bool {
	for _, b := range data {