proxygen: fizz::HandshakeContextImpl< Hash

#include <HandshakeContext.h>

Inheritance diagram for fizz::HandshakeContextImpl< Hash >:

Public Member Functions
	HandshakeContextImpl (const std::string &hkdfLabelPrefix)

void	appendToTranscript (const Buf &data) override

Buf	getHandshakeContext () const override

Buf	getFinishedData (folly::ByteRange baseKey) const override

folly::ByteRange	getBlankContext () const override

Public Member Functions inherited from fizz::HandshakeContext
virtual	~HandshakeContext ()=default

Private Attributes
folly::ssl::OpenSSLHash::Digest	hashState_

std::string	hkdfLabelPrefix_

Detailed Description

template<typename Hash>
class fizz::HandshakeContextImpl< Hash >

Definition at line 47 of file HandshakeContext.h.

Constructor & Destructor Documentation

template<typename Hash >

fizz::HandshakeContextImpl< Hash >::HandshakeContextImpl ( const std::string & hkdfLabelPrefix )

Definition at line 14 of file HandshakeContext-inl.h.

References folly::ssl::OpenSSLHash::Digest::hash_init(), and fizz::HandshakeContextImpl< Hash >::hashState_.

     : hkdfLabelPrefix_(hkdfLabelPrefix) {
   hashState_ = folly::ssl::OpenSSLHash::Digest();
   hashState_.hash_init(Hash::HashEngine());
 }

Member Function Documentation

template<typename Hash >

void fizz::HandshakeContextImpl< Hash >::appendToTranscript ( const Buf & transcript )

overridevirtual

Appends transcript to the current handshake transcript.

Implements fizz::HandshakeContext.

Definition at line 22 of file HandshakeContext-inl.h.

References folly::ssl::OpenSSLHash::Digest::hash_update(), and fizz::HandshakeContextImpl< Hash >::hashState_.

                                                                    {
   hashState_.hash_update(*data);
 }

template<typename Hash >

folly::ByteRange fizz::HandshakeContextImpl< Hash >::getBlankContext ( ) const

inlineoverridevirtual

Returns the handshake context for an empty transcript.

Implements fizz::HandshakeContext.

Definition at line 57 of file HandshakeContext.h.

                                                   {
     return Hash::BlankHash;
   }

template<typename Hash >

Buf fizz::HandshakeContextImpl< Hash >::getFinishedData ( folly::ByteRange baseKey ) const

overridevirtual

Returns the finished verify_data from the current handshake context and baseKey.

Implements fizz::HandshakeContext.

Definition at line 37 of file HandshakeContext-inl.h.

References context, folly::IOBuf::create(), data, fizz::HandshakeContextImpl< Hash >::getHandshakeContext(), and fizz::HandshakeContextImpl< Hash >::hkdfLabelPrefix_.

                                   {
   auto context = getHandshakeContext();
   auto finishedKey =
       KeyDerivationImpl<Hash>(hkdfLabelPrefix_)
           .expandLabel(
               baseKey, "finished", folly::IOBuf::create(0), Hash::HashLen);
   auto data = folly::IOBuf::create(Hash::HashLen);
   data->append(Hash::HashLen);
   auto outRange = folly::MutableByteRange(data->writableData(), data->length());
   Hash::hmac(finishedKey->coalesce(), *context, outRange);
   return data;
 }

template<typename Hash >

Buf fizz::HandshakeContextImpl< Hash >::getHandshakeContext ( ) const

overridevirtual

Returns the handshake context for the current transcript.

Implements fizz::HandshakeContext.

Definition at line 27 of file HandshakeContext-inl.h.

References folly::IOBuf::create(), folly::ssl::OpenSSLHash::Digest::hash_final(), and fizz::HandshakeContextImpl< Hash >::hashState_.

Referenced by fizz::HandshakeContextImpl< Hash >::getFinishedData().

                                                           {
   folly::ssl::OpenSSLHash::Digest copied(hashState_);
   auto out = folly::IOBuf::create(Hash::HashLen);
   out->append(Hash::HashLen);
   folly::MutableByteRange outRange(out->writableData(), out->length());
   copied.hash_final(outRange);
   return out;
 }