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##### ssl::context::use_private_key_file (1 of 2 overloads)

Use a private key from a file.

    void use_private_key_file(
        const std::string & filename,
        file_format format);

This function is used to load a private key into the context from a file.

###### Parameters

filename

  The name of the file containing the private key.

format

  The file format (ASN.1 or PEM).

###### Exceptions

boost::system::system_error

  Thrown on failure.

###### Remarks

Calls `SSL_CTX_use_PrivateKey_file`.