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a4Encode a piece of binary data into PEM format.

    Args:
      data (byte string):
        The piece of binary data to encode.
      marker (string):
        The marker for the PEM block (e.g. "PUBLIC KEY").
        Note that there is no official master list for all allowed markers.
        Still, you can refer to the OpenSSL_ source code.
      passphrase (byte string):
        If given, the PEM block will be encrypted. The key is derived from
        the passphrase.
      randfunc (callable):
        Random number generation function; it accepts an integer N and returns
        a byte string of random data, N bytes long. If not given, a new one is
        instantiated.

    Returns:
      The PEM block, as a string.

    .. _OpenSSL: https://github.com/openssl/openssl/blob/master/include/openssl/pem.h
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fS) aDecode a PEM block into binary.

    Args:
      pem_data (string):
        The PEM block.
      passphrase (byte string):
        If given and the PEM block is encrypted,
        the key will be derived from the passphrase.

    Returns:
      A tuple with the binary data, the marker string, and a boolean to
      indicate if decryption was performed.

    Raises:
      ValueError: if decoding fails, if the PEM file is encrypted and no passphrase has
                  been provided or if the passphrase is incorrect.
    z\s*-----BEGIN (.*)-----\s+zNot a valid PEM pre boundaryrz-----END (.*)-----\s*$zNot a valid PEM post boundary rzProc-Type:4,ENCRYPTEDz-PEM is encrypted, but no passphrase available:rzDEK-Infoz$PEM encryption format not supported.,TzDES-CBCrzDES-EDE3-CBCzAES-128-CBCNrzAES-192-CBCzAES-256-CBC z
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