| parsePEMKey(s,
          private=False,
          public=False,
          passwordCallback=None,
          implementations=['openssl', 'python'])
  Parse a PEM-format key.The PEM format is used by OpenSSL and other tools. The format is 
  typically used to store both the public and private components of a 
  key. For example: 
  -----BEGIN RSA PRIVATE KEY-----
   MIICXQIBAAKBgQDYscuoMzsGmW0pAYsmyHltxB2TdwHS0dImfjCMfaSDkfLdZY5+
   dOWORVns9etWnr194mSGA1F0Pls/VJW8+cX9+3vtJV8zSdANPYUoQf0TP7VlJxkH
   dSRkUbEoz5bAAs/+970uos7n7iXQIni+3erUTdYEk2iWnMBjTljfgbK/dQIDAQAB
   AoGAJHoJZk75aKr7DSQNYIHuruOMdv5ZeDuJvKERWxTrVJqE32/xBKh42/IgqRrc
   esBN9ZregRCd7YtxoL+EVUNWaJNVx2mNmezEznrc9zhcYUrgeaVdFO2yBF1889zO
   gCOVwrO8uDgeyj6IKa25H6c1N13ih/o7ZzEgWbGG+ylU1yECQQDv4ZSJ4EjSh/Fl
   aHdz3wbBa/HKGTjC8iRy476Cyg2Fm8MZUe9Yy3udOrb5ZnS2MTpIXt5AF3h2TfYV
   VoFXIorjAkEA50FcJmzT8sNMrPaV8vn+9W2Lu4U7C+K/O2g1iXMaZms5PC5zV5aV
   CKXZWUX1fq2RaOzlbQrpgiolhXpeh8FjxwJBAOFHzSQfSsTNfttp3KUpU0LbiVvv
   i+spVSnA0O4rq79KpVNmK44Mq67hsW1P11QzrzTAQ6GVaUBRv0YS061td1kCQHnP
   wtN2tboFR6lABkJDjxoGRvlSt4SOPr7zKGgrWjeiuTZLHXSAnCY+/hr5L9Q3ZwXG
   6x6iBdgLjVIe4BZQNtcCQQDXGv/gWinCNTN3MPWfTW/RGzuMYVmyBFais0/VrgdH
   h1dLpztmpQqfyH/zrBXQ9qL/zR4ojS6XYneO/U18WpEe
   -----END RSA PRIVATE KEY-----
To generate a key like this with OpenSSL, run: 
   openssl genrsa 2048 > key.pem
This format also supports password-encrypted private keys. TLS Lite 
  can only handle password-encrypted private keys when OpenSSL and 
  M2Crypto are installed. In this case, passwordCallback will be invoked 
  to query the user for the password. 
    Parameters:s-
         A string containing a PEM-encoded public or private key.(type=str)
 private-
         If True, aSyntaxErrorwill be raised if the 
        private key component is not present.(type=bool)
 public-
         If True, the private key component (if present) will be 
        discarded, so this function will always return a public key.(type=bool)
 passwordCallback-
         This function will be called, with no arguments, if the 
        PEM-encoded private key is password-encrypted. The callback 
        should return the password string. If the password is incorrect, 
        SyntaxError will be raised. If no callback is passed and the key 
        is password-encrypted, a prompt will be displayed at the 
        console.(type=callable)
 Returns:
        An RSA key.
        (type=
 tlslite.utils.RSAKey.RSAKey)
 Raises:SyntaxError-
        If the key is not properly formatted.
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