1517-p2.py

def _read_private_key(self, tag, f, password=None):
        lines = f.readlines()
        start = 0
        beginning_of_key = "-----BEGIN " + tag + " PRIVATE KEY-----"
        while start < len(lines) and lines[start].strip() != beginning_of_key:
            start += 1
        if start >= len(lines):
            raise SSHException("not a valid " + tag + " private key file")
        # parse any headers first
        ...