#include <tls_extensions.h>

Inheritance diagram for Botan::TLS::Supported_Point_Formats:

Public Types
enum	ECPointFormat : uint8_t { UNCOMPRESSED = 0, ANSIX962_COMPRESSED_PRIME = 1, ANSIX962_COMPRESSED_CHAR2 = 2 }

Public Member Functions
bool	empty () const override

bool	prefers_compressed ()

std::vector< uint8_t >	serialize (Connection_Side whoami) const override

	Supported_Point_Formats (bool prefer_compressed)

	Supported_Point_Formats (TLS_Data_Reader &reader, uint16_t extension_size)

Handshake_Extension_Type	type () const override

Static Public Member Functions
static Handshake_Extension_Type	static_type ()

Detailed Description

Supported Point Formats Extension (RFC 4492)

Definition at line 269 of file tls_extensions.h.

Member Enumeration Documentation

enum Botan::TLS::Supported_Point_Formats::ECPointFormat : uint8_t

Enumerator
UNCOMPRESSED
ANSIX962_COMPRESSED_PRIME
ANSIX962_COMPRESSED_CHAR2

Definition at line 272 of file tls_extensions.h.

                          : uint8_t {
          UNCOMPRESSED = 0,
          ANSIX962_COMPRESSED_PRIME = 1,
          ANSIX962_COMPRESSED_CHAR2 = 2, // don't support these curves
       };

Constructor & Destructor Documentation

Botan::TLS::Supported_Point_Formats::Supported_Point_Formats ( bool prefer_compressed )

inlineexplicit

Definition at line 285 of file tls_extensions.h.

285 :

286 m_prefers_compressed(prefer_compressed) {}

Botan::TLS::Supported_Point_Formats::Supported_Point_Formats	(	TLS_Data_Reader &	reader,
		uint16_t	extension_size
	)

Definition at line 390 of file tls_extensions.cpp.

References ANSIX962_COMPRESSED_PRIME, Botan::TLS::TLS_Data_Reader::discard_next(), Botan::TLS::TLS_Data_Reader::get_byte(), and UNCOMPRESSED.

    {
    uint8_t len = reader.get_byte();
 
    if(len + 1 != extension_size)
       throw Decoding_Error("Inconsistent length field in supported point formats list");
 
    for(size_t i = 0; i != len; ++i)
       {
       uint8_t format = reader.get_byte();
 
       if(static_cast<ECPointFormat>(format) == UNCOMPRESSED)
          {
          m_prefers_compressed = false;
          reader.discard_next(len-i-1);
          return;
          }
       else if(static_cast<ECPointFormat>(format) == ANSIX962_COMPRESSED_PRIME)
          {
          m_prefers_compressed = true;
          reader.discard_next(len-i-1);
          return;
          }
 
       // ignore ANSIX962_COMPRESSED_CHAR2, we don't support these curves
       }
    }

Member Function Documentation

bool Botan::TLS::Supported_Point_Formats::empty ( ) const

inlineoverridevirtual

Returns: if we should encode this extension or not

Implements Botan::TLS::Extension.

Definition at line 291 of file tls_extensions.h.

291 { return false; }

bool Botan::TLS::Supported_Point_Formats::prefers_compressed ( )

inline

Definition at line 293 of file tls_extensions.h.

293 { return m_prefers_compressed; }

std::vector< uint8_t > Botan::TLS::Supported_Point_Formats::serialize ( Connection_Side whoami ) const

overridevirtual

Returns: serialized binary for the extension

Implements Botan::TLS::Extension.

Definition at line 377 of file tls_extensions.cpp.

References ANSIX962_COMPRESSED_PRIME, and UNCOMPRESSED.

    {
    // if this extension is sent, it MUST include uncompressed (RFC 4492, section 5.1)
    if(m_prefers_compressed)
       {
       return std::vector<uint8_t>{2, ANSIX962_COMPRESSED_PRIME, UNCOMPRESSED};
       }
    else
       {
       return std::vector<uint8_t>{1, UNCOMPRESSED};
       }
    }