Botan::Seed_Expanding_Keypair_Codec Class Reference

Codec for private keys as 64-byte seeds: d || z. More...

#include <kyber_keys.h>

Inheritance diagram for Botan::Seed_Expanding_Keypair_Codec:

Public Member Functions
KyberInternalKeypair	decode_keypair (std::span< const uint8_t > buffer, KyberConstants mode) const override
secure_vector< uint8_t >	encode_keypair (KyberInternalKeypair keypair) const override

Detailed Description

Codec for private keys as 64-byte seeds: d || z.

Definition at line 37 of file kyber_keys.h.

Member Function Documentation

decode_keypair()

KyberInternalKeypair Botan::Seed_Expanding_Keypair_Codec::decode_keypair ( std::span< const uint8_t > buffer, KyberConstants mode ) const

overridevirtual

Implements Botan::Kyber_Keypair_Codec.

Definition at line 86 of file kyber_keys.cpp.

                                                                                             {
   BufferSlicer s(private_key);
   auto seed = KyberPrivateKeySeed{
      s.copy<KyberSeedRandomness>(KyberConstants::SEED_BYTES),
      s.copy<KyberImplicitRejectionValue>(KyberConstants::SEED_BYTES),
   };
   BOTAN_ASSERT_NOMSG(s.empty());
   return Kyber_Algos::expand_keypair(std::move(seed), std::move(mode));
}

References BOTAN_ASSERT_NOMSG, Botan::BufferSlicer::copy(), Botan::BufferSlicer::empty(), Botan::Kyber_Algos::expand_keypair(), and Botan::KyberConstants::SEED_BYTES.

Referenced by Botan::Kyber_PrivateKey::Kyber_PrivateKey().

encode_keypair()

secure_vector< uint8_t > Botan::Seed_Expanding_Keypair_Codec::encode_keypair ( KyberInternalKeypair keypair ) const

overridevirtual

Implements Botan::Kyber_Keypair_Codec.

Definition at line 97 of file kyber_keys.cpp.

                                                                                                      {
   BOTAN_ASSERT_NONNULL(keypair.second);
   const auto& seed = keypair.second->seed();
   BOTAN_ARG_CHECK(seed.d.has_value(), "Cannot encode keypair without the full private seed");
   return concat<secure_vector<uint8_t>>(seed.d.value(), seed.z);
}

References BOTAN_ARG_CHECK, BOTAN_ASSERT_NONNULL, and Botan::concat().

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The documentation for this class was generated from the following files:

• src/lib/pubkey/kyber/kyber_common/kyber_keys.h
• src/lib/pubkey/kyber/kyber_common/kyber_keys.cpp