#include <tls_extensions.h>

Inheritance diagram for Botan::TLS::Signature_Algorithms:

Public Member Functions
bool	empty () const override

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

	Signature_Algorithms (const std::vector< Signature_Scheme > &schemes)

	Signature_Algorithms (TLS_Data_Reader &reader, uint16_t extension_size)

const std::vector< Signature_Scheme > &	supported_schemes () const

Handshake_Extension_Type	type () const override

Static Public Member Functions
static Handshake_Extension_Type	static_type ()

Detailed Description

Signature Algorithms Extension for TLS 1.2 (RFC 5246)

Definition at line 295 of file tls_extensions.h.

Constructor & Destructor Documentation

◆ Signature_Algorithms() [1/2]

Botan::TLS::Signature_Algorithms::Signature_Algorithms ( const std::vector< Signature_Scheme > & schemes )

inlineexplicit

Definition at line 309 of file tls_extensions.h.

309 :

310 m_schemes(schemes) {}

◆ Signature_Algorithms() [2/2]

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

Definition at line 427 of file tls_extensions.cpp.

References Botan::TLS::TLS_Data_Reader::get_uint16_t().

    {
    uint16_t len = reader.get_uint16_t();
 
    if(len + 2 != extension_size || len % 2 == 1 || len == 0)
       {
       throw Decoding_Error("Bad encoding on signature algorithms extension");
       }
 
    while(len)
       {
       const uint16_t scheme_code = reader.get_uint16_t();
       m_schemes.push_back(static_cast<Signature_Scheme>(scheme_code));
       len -= 2;
       }
    }

Member Function Documentation

◆ empty()

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

inlineoverridevirtual

Returns: if we should encode this extension or not

Implements Botan::TLS::Extension.

Definition at line 307 of file tls_extensions.h.

307 { return m_schemes.empty(); }

◆ serialize()

std::vector< uint8_t > Botan::TLS::Signature_Algorithms::serialize ( ) const

overridevirtual

Returns: serialized binary for the extension

Implements Botan::TLS::Extension.

Definition at line 405 of file tls_extensions.cpp.

References BOTAN_ASSERT, and Botan::get_byte().

    {
    BOTAN_ASSERT(m_schemes.size() < 256, "Too many signature schemes");
 
    std::vector<uint8_t> buf;
 
    const uint16_t len = static_cast<uint16_t>(m_schemes.size() * 2);
 
    buf.push_back(get_byte(0, len));
    buf.push_back(get_byte(1, len));
 
    for(Signature_Scheme scheme : m_schemes)
       {
       const uint16_t scheme_code = static_cast<uint16_t>(scheme);
 
       buf.push_back(get_byte(0, scheme_code));
       buf.push_back(get_byte(1, scheme_code));
       }
 
    return buf;
    }