Botan::Kyber_PublicKeyInternal Class Reference

#include <kyber_keys.h>

Public Member Functions
const KyberHashedPublicKey &	H_public_key_bits_raw () const
Ciphertext	indcpa_encrypt (StrongSpan< const KyberMessage > m, StrongSpan< const KyberEncryptionRandomness > r) const
	Kyber_PublicKeyInternal ()=delete
	Kyber_PublicKeyInternal (const KyberConstants &mode, std::span< const uint8_t > polynomials, KyberSeedRho seed)
	Kyber_PublicKeyInternal (KyberConstants mode, PolynomialVector polynomials, KyberSeedRho seed)
const KyberConstants &	mode () const
const KyberSerializedPublicKey &	public_key_bits_raw () const
const KyberSeedRho &	rho () const
const PolynomialVector &	t () const

Detailed Description

Definition at line 21 of file kyber_keys.h.

Constructor & Destructor Documentation

Kyber_PublicKeyInternal() [1/3]

Botan::Kyber_PublicKeyInternal::Kyber_PublicKeyInternal	(	KyberConstants	mode,
		PolynomialVector	polynomials,
		KyberSeedRho	seed )

Definition at line 19 of file kyber_keys.cpp.

                                                                                                          :
      m_mode(std::move(mode)),
      m_t(std::move(t)),
      m_rho(std::move(rho)),
      m_public_key_bits_raw(concat(m_t.to_bytes(), m_rho)),
      m_H_public_key_bits_raw(m_mode.symmetric_primitives().H(m_public_key_bits_raw)) {}

Kyber_PublicKeyInternal() [2/3]

Botan::Kyber_PublicKeyInternal::Kyber_PublicKeyInternal ( const KyberConstants & mode, std::span< const uint8_t > polynomials, KyberSeedRho seed )

inline

Definition at line 25 of file kyber_keys.h.

                                                                                                                 :
            Kyber_PublicKeyInternal(mode, PolynomialVector::from_bytes(polynomials, mode), std::move(seed)) {}

Kyber_PublicKeyInternal() [3/3]

Botan::Kyber_PublicKeyInternal::Kyber_PublicKeyInternal ( )

delete

Member Function Documentation

H_public_key_bits_raw()

const KyberHashedPublicKey & Botan::Kyber_PublicKeyInternal::H_public_key_bits_raw ( ) const

inline

Definition at line 38 of file kyber_keys.h.

{ return m_H_public_key_bits_raw; }

indcpa_encrypt()

Ciphertext Botan::Kyber_PublicKeyInternal::indcpa_encrypt	(	StrongSpan< const KyberMessage >	m,
		StrongSpan< const KyberEncryptionRandomness >	r ) const

NIST FIPS 203 IPD, Algorithm 13 (K-PKE.Encrypt)

Definition at line 29 of file kyber_keys.cpp.

                                                                                                        {
   auto at = PolynomialMatrix::generate(m_rho, true /* transposed */, m_mode);
 
   auto rv = PolynomialVector::getnoise_eta1(r, 0, m_mode);
   auto e1 = PolynomialVector::getnoise_eta2(r, m_mode.k(), m_mode);
   auto e2 = Polynomial::getnoise_eta2(r, 2 * m_mode.k(), m_mode);
 
   rv.ntt();
 
   auto u = at.pointwise_acc_montgomery(rv);
   u.invntt_tomont();
   u += e1;
   u.reduce();
 
   auto mu = Polynomial::from_message(m);
   auto v = PolynomialVector::pointwise_acc_montgomery(m_t, rv);
   v.invntt_tomont();
   v += e2;
   v += mu;
   v.reduce();
 
   return Ciphertext(std::move(u), v, m_mode);
}

References Botan::Polynomial::from_message(), Botan::PolynomialMatrix::generate(), Botan::PolynomialVector::getnoise_eta1(), Botan::Polynomial::getnoise_eta2(), Botan::PolynomialVector::getnoise_eta2(), Botan::KyberConstants::k(), and Botan::PolynomialVector::pointwise_acc_montgomery().

mode()

const KyberConstants & Botan::Kyber_PublicKeyInternal::mode ( ) const

inline

Definition at line 34 of file kyber_keys.h.

{ return m_mode; }

public_key_bits_raw()

const KyberSerializedPublicKey & Botan::Kyber_PublicKeyInternal::public_key_bits_raw ( ) const

inline

Definition at line 36 of file kyber_keys.h.

{ return m_public_key_bits_raw; }

rho()

const KyberSeedRho & Botan::Kyber_PublicKeyInternal::rho ( ) const

inline

Definition at line 32 of file kyber_keys.h.

{ return m_rho; }

t()

const PolynomialVector & Botan::Kyber_PublicKeyInternal::t ( ) const

inline

Definition at line 30 of file kyber_keys.h.

{ return m_t; }

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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