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# boost::asio::ssl::basic_context< Service > Class Template Reference

Inherits boost::asio::ssl::context_base.

Inheritance diagram for boost::asio::ssl::basic_context< Service >:

List of all members.

## Detailed Description

### template<typename Service>
class boost::asio::ssl::basic_context< Service >

SSL context.

## Public Types

typedef Service | service_type
| The type of the service that will be used to provide context operations.
typedef service_type::impl_type | impl_type
| The native implementation type of the locking dispatcher.
typedef int | options
| Bitmask type for SSL options.
typedef int | verify_mode
| Bitmask type for peer verification.
| sslv2
| Generic SSL version 2.
| sslv2_client
| SSL version 2 client.
| sslv2_server
| SSL version 2 server.
| sslv3
| Generic SSL version 3.
| sslv3_client
| SSL version 3 client.
| sslv3_server
| SSL version 3 server.
| tlsv1
| Generic TLS version 1.
| tlsv1_client
| TLS version 1 client.
| tlsv1_server
| TLS version 1 server.
| sslv23
| Generic SSL/TLS.
| sslv23_client
| SSL/TLS client.
| sslv23_server
| SSL/TLS server.
| asn1
| ASN.1 file.
| pem
| PEM file.
enum | method { sslv2, sslv2_client, sslv2_server, sslv3,
sslv3_client,
sslv3_server,
tlsv1,
tlsv1_client,
tlsv1_server,
sslv23,
sslv23_client,
sslv23_server
}
| Different methods supported by a context. More...
enum | file_format { asn1, pem }
| File format types. More...

## Public Member Functions

| basic_context (boost::asio::io_service &io_service, method m)
| Constructor.
| ~basic_context ()
| Destructor.
impl_type | impl ()
| Get the underlying implementation in the native type.
void | set_options (options o)
| Set options on the context.
template<typename Error_Handler>
void | set_options (options o, Error_Handler error_handler)
| Set options on the context.
void | set_verify_mode (verify_mode v)
| Set the peer verification mode.
template<typename Error_Handler>
void | set_verify_mode (verify_mode v, Error_Handler error_handler)
| Set the peer verification mode.
void | load_verify_file (const std::string &filename)
| Load a certification authority file for performing verification.
template<typename Error_Handler>
void | load_verify_file (const std::string &filename, Error_Handler error_handler)
| Load a certification authority file for performing verification.
void | add_verify_path (const std::string &path)
| Add a directory containing certificate authority files to be used for performing verification.
template<typename Error_Handler>
void | add_verify_path (const std::string &path, Error_Handler error_handler)
| Add a directory containing certificate authority files to be used for performing verification.
void | use_certificate_file (const std::string &filename, file_format format)
| Use a certificate from a file.
template<typename Error_Handler>
void | use_certificate_file (const std::string &filename, file_format format, Error_Handler error_handler)
| Use a certificate from a file.
void | use_certificate_chain_file (const std::string &filename)
| Use a certificate chain from a file.
template<typename Error_Handler>
void | use_certificate_chain_file (const std::string &filename, Error_Handler error_handler)
| Use a certificate chain from a file.
void | use_private_key_file (const std::string &filename, file_format format)
| Use a private key from a file.
template<typename Error_Handler>
void | use_private_key_file (const std::string &filename, file_format format, Error_Handler error_handler)
| Use a private key from a file.
void | use_rsa_private_key_file (const std::string &filename, file_format format)
| Use an RSA private key from a file.
template<typename Error_Handler>
void | use_rsa_private_key_file (const std::string &filename, file_format format, Error_Handler error_handler)
| Use an RSA private key from a file.
void | use_tmp_dh_file (const std::string &filename)
| Use the specified file to obtain the temporary Diffie-Hellman parameters.
template<typename Error_Handler>
void | use_tmp_dh_file (const std::string &filename, Error_Handler error_handler)
| Use the specified file to obtain the temporary Diffie-Hellman parameters.

## Static Public Attributes

static const int | default_workarounds = implementation_defined
| Implement various bug workarounds.
static const int | single_dh_use = implementation_defined
| Always create a new key when using tmp_dh parameters.
static const int | no_sslv2 = implementation_defined
| Disable SSL v2.
static const int | no_sslv3 = implementation_defined
| Disable SSL v3.
static const int | no_tlsv1 = implementation_defined
| Disable TLS v1.
static const int | verify_none = implementation_defined
| No verification.
static const int | verify_peer = implementation_defined
| Verify the peer.
static const int | verify_fail_if_no_peer_cert = implementation_defined
| Fail verification if the peer has no certificate. Ignored unless verify_peer is set.
static const int | verify_client_once = implementation_defined
| Do not request client certificate on renegotiation. Ignored unless verify_peer is set.

## Private Attributes

service_type & | service_
| The backend service implementation.
impl_type | impl_
| The underlying native implementation.

## Member Typedef Documentation

template<typename Service>

typedef Service boost::asio::ssl::basic_context< Service >::service_type

The type of the service that will be used to provide context operations.

template<typename Service>

typedef service_type::impl_type boost::asio::ssl::basic_context< Service >::impl_type

The native implementation type of the locking dispatcher.

typedef int boost::asio::ssl::context_base::options`[inherited]`

Bitmask type for SSL options.

typedef int boost::asio::ssl::context_base::verify_mode`[inherited]`

Bitmask type for peer verification.

## Member Enumeration Documentation

enum boost::asio::ssl::context_base::method`[inherited]`

Different methods supported by a context.

Enumerator:

  sslv2 | Generic SSL version 2.
  sslv2_client | SSL version 2 client.
  sslv2_server | SSL version 2 server.
  sslv3 | Generic SSL version 3.
  sslv3_client | SSL version 3 client.
  sslv3_server | SSL version 3 server.
  tlsv1 | Generic TLS version 1.
  tlsv1_client | TLS version 1 client.
  tlsv1_server | TLS version 1 server.
  sslv23 | Generic SSL/TLS.
  sslv23_client | SSL/TLS client.
  sslv23_server | SSL/TLS server.

enum boost::asio::ssl::context_base::file_format`[inherited]`

File format types.

Enumerator:

  asn1 | ASN.1 file.
  pem | PEM file.

## Constructor & Destructor Documentation

template<typename Service>

boost::asio::ssl::basic_context< Service >::basic_context | ( | boost::asio::io_service & | io_service,
|  | method | m |
| ) |  |  |

Constructor.

template<typename Service>

boost::asio::ssl::basic_context< Service >::~basic_context | ( |  | ) |

Destructor.

## Member Function Documentation

template<typename Service>

impl_type boost::asio::ssl::basic_context< Service >::impl | ( |  | ) |

Get the underlying implementation in the native type.

This function may be used to obtain the underlying implementation of the context. This is intended to allow access to context functionality that is not otherwise provided.

template<typename Service>

void boost::asio::ssl::basic_context< Service >::set_options | ( | options | o | ) |

Set options on the context.

This function may be used to configure the SSL options used by the context.

Parameters:

  | o | A bitmask of options. The available option values are defined in the context_base class. The options are bitwise-ored with any existing value for the options.

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::set_options | ( | options | o,
|  | Error_Handler | error_handler |
| ) |  |  |

Set options on the context.

This function may be used to configure the SSL options used by the context.

Parameters:

  | o | A bitmask of options. The available option values are defined in the context_base class. The options are bitwise-ored with any existing value for the options.
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::set_verify_mode | ( | verify_mode | v | ) |

Set the peer verification mode.

This function may be used to configure the peer verification mode used by the context.

Parameters:

  | v | A bitmask of peer verification modes. The available verify_mode values are defined in the context_base class.

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::set_verify_mode | ( | verify_mode | v,
|  | Error_Handler | error_handler |
| ) |  |  |

Set the peer verification mode.

This function may be used to configure the peer verification mode used by the context.

Parameters:

  | v | A bitmask of peer verification modes. The available verify_mode values are defined in the context_base class.
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::load_verify_file | ( | const std::string & | filename | ) |

Load a certification authority file for performing verification.

This function is used to load one or more trusted certification authorities from a file.

Parameters:

  | filename | The name of a file containing certification authority certificates in PEM format.

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::load_verify_file | ( | const std::string & | filename,
|  | Error_Handler | error_handler |
| ) |  |  |

Load a certification authority file for performing verification.

This function is used to load the certificates for one or more trusted certification authorities from a file.

Parameters:

  | filename | The name of a file containing certification authority certificates in PEM format.
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::add_verify_path | ( | const std::string & | path | ) |

Add a directory containing certificate authority files to be used for performing verification.

This function is used to specify the name of a directory containing certification authority certificates. Each file in the directory must contain a single certificate. The files must be named using the subject name's hash and an extension of ".0".

Parameters:

  | path | The name of a directory containing the certificates.

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::add_verify_path | ( | const std::string & | path,
|  | Error_Handler | error_handler |
| ) |  |  |

Add a directory containing certificate authority files to be used for performing verification.

This function is used to specify the name of a directory containing certification authority certificates. Each file in the directory must contain a single certificate. The files must be named using the subject name's hash and an extension of ".0".

Parameters:

  | path | The name of a directory containing the certificates.
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::use_certificate_file | ( | const std::string & | filename,
|  | file_format | format |
| ) |  |  |

Use a certificate from a file.

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

Parameters:

  | filename | The name of the file containing the certificate.
  | format | The file format (ASN.1 or PEM).

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::use_certificate_file | ( | const std::string & | filename,
|  | file_format | format,
|  | Error_Handler | error_handler |
| ) |  |  |

Use a certificate from a file.

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

Parameters:

  | filename | The name of the file containing the certificate.
  | format | The file format (ASN.1 or PEM).
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::use_certificate_chain_file | ( | const std::string & | filename | ) |

Use a certificate chain from a file.

This function is used to load a certificate chain into the context from a file.

Parameters:

  | filename | The name of the file containing the certificate. The file must use the PEM format.

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::use_certificate_chain_file | ( | const std::string & | filename,
|  | Error_Handler | error_handler |
| ) |  |  |

Use a certificate chain from a file.

This function is used to load a certificate chain into the context from a file.

Parameters:

  | filename | The name of the file containing the certificate. The file must use the PEM format.
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::use_private_key_file | ( | const std::string & | filename,
|  | file_format | format |
| ) |  |  |

Use a private key from a file.

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::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::use_private_key_file | ( | const std::string & | filename,
|  | file_format | format,
|  | Error_Handler | error_handler |
| ) |  |  |

Use a private key from a file.

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).
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::use_rsa_private_key_file | ( | const std::string & | filename,
|  | file_format | format |
| ) |  |  |

Use an RSA private key from a file.

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

Parameters:

  | filename | The name of the file containing the RSA private key.
  | format | The file format (ASN.1 or PEM).

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::use_rsa_private_key_file | ( | const std::string & | filename,
|  | file_format | format,
|  | Error_Handler | error_handler |
| ) |  |  |

Use an RSA private key from a file.

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

Parameters:

  | filename | The name of the file containing the RSA private key.
  | format | The file format (ASN.1 or PEM).
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

template<typename Service>

void boost::asio::ssl::basic_context< Service >::use_tmp_dh_file | ( | const std::string & | filename | ) |

Use the specified file to obtain the temporary Diffie-Hellman parameters.

This function is used to load Diffie-Hellman parameters into the context from a file.

Parameters:

  | filename | The name of the file containing the Diffie-Hellman parameters. The file must use the PEM format.

Exceptions:

  | boost::asio::error | Thrown on failure.

template<typename Service>
template<typename Error_Handler>

void boost::asio::ssl::basic_context< Service >::use_tmp_dh_file | ( | const std::string & | filename,
|  | Error_Handler | error_handler |
| ) |  |  |

Use the specified file to obtain the temporary Diffie-Hellman parameters.

This function is used to load Diffie-Hellman parameters into the context from a file.

Parameters:

  | filename | The name of the file containing the Diffie-Hellman parameters. The file must use the PEM format.
  | error_handler | A handler to be called when the operation completes, to indicate whether or not an error has occurred. Copies will be made of the handler as required. The function signature of the handler must be:
       void error_handler(
         const boost::asio::error& error // Result of operation
       );

## Member Data Documentation

template<typename Service>

service_type& boost::asio::ssl::basic_context< Service >::service_`[private]`

The backend service implementation.

template<typename Service>

impl_type boost::asio::ssl::basic_context< Service >::impl_`[private]`

The underlying native implementation.

const int boost::asio::ssl::context_base::default_workarounds = implementation_defined`[static, inherited]`

Implement various bug workarounds.

const int boost::asio::ssl::context_base::single_dh_use = implementation_defined`[static, inherited]`

Always create a new key when using tmp_dh parameters.

const int boost::asio::ssl::context_base::no_sslv2 = implementation_defined`[static, inherited]`

Disable SSL v2.

const int boost::asio::ssl::context_base::no_sslv3 = implementation_defined`[static, inherited]`

Disable SSL v3.

const int boost::asio::ssl::context_base::no_tlsv1 = implementation_defined`[static, inherited]`

Disable TLS v1.

const int boost::asio::ssl::context_base::verify_none = implementation_defined`[static, inherited]`

No verification.

const int boost::asio::ssl::context_base::verify_peer = implementation_defined`[static, inherited]`

Verify the peer.

const int boost::asio::ssl::context_base::verify_fail_if_no_peer_cert = implementation_defined`[static, inherited]`

Fail verification if the peer has no certificate. Ignored unless verify_peer is set.

const int boost::asio::ssl::context_base::verify_client_once = implementation_defined`[static, inherited]`

Do not request client certificate on renegotiation. Ignored unless verify_peer is set.

| Copyright © 2003 - 2006 Christopher M. Kohlhoff