@classmethod
def addPKCS1SHA1Prefix(cls, hashBytes, withNULL=True):
    """Add PKCS#1 v1.5 algorithm identifier prefix to SHA1 hash bytes"""
    if not withNULL:
        prefixBytes = bytearray([48, 31, 48, 7, 6, 5, 43, 14, 3, 2, 26, 4, 20])
    else:
        prefixBytes = cls._pkcs1Prefixes['sha1']
    prefixedBytes = prefixBytes + hashBytes
    return prefixedBytes
