Botan::Ciphertext Class Reference

#include <kyber_structures.h>

Public Member Functions
PolynomialVector &	b ()
	Ciphertext ()=delete
	Ciphertext (PolynomialVector b, const Polynomial &v, KyberConstants mode)
KyberCompressedCiphertext	to_bytes ()
void	to_bytes (StrongSpan< KyberCompressedCiphertext > out)
Polynomial &	v ()

Static Public Member Functions
static Ciphertext	from_bytes (StrongSpan< const KyberCompressedCiphertext > buffer, const KyberConstants &mode)

Detailed Description

Definition at line 554 of file kyber_structures.h.

Constructor & Destructor Documentation

Ciphertext() [1/2]

Botan::Ciphertext::Ciphertext ( )

delete

Referenced by from_bytes().

Ciphertext() [2/2]

Botan::Ciphertext::Ciphertext ( PolynomialVector b, const Polynomial & v, KyberConstants mode )

inline

Definition at line 558 of file kyber_structures.h.

                                                                               :
            m_mode(std::move(mode)), m_b(std::move(b)), m_v(v) {}

Member Function Documentation

b()

PolynomialVector & Botan::Ciphertext::b ( )

inline

Definition at line 590 of file kyber_structures.h.

{ return m_b; }

Referenced by Botan::Kyber_PrivateKeyInternal::indcpa_decrypt().

from_bytes()

static Ciphertext Botan::Ciphertext::from_bytes ( StrongSpan< const KyberCompressedCiphertext > buffer, const KyberConstants & mode )

inlinestatic

Definition at line 561 of file kyber_structures.h.

                                                                                                                   {
         const size_t pvb = mode.polynomial_vector_compressed_bytes();
         const size_t pcb = mode.polynomial_compressed_bytes();
 
         if(buffer.size() != pvb + pcb) {
            throw Decoding_Error("Kyber: unexpected ciphertext length");
         }
 
         BufferSlicer bs(buffer);
         auto pv = bs.take(pvb);
         auto p = bs.take(pcb);
         BOTAN_ASSERT_NOMSG(bs.empty());
 
         return Ciphertext(decompress_polynomial_vector(pv, mode), decompress_polynomial(p, mode), mode);
      }

References BOTAN_ASSERT_NOMSG, Ciphertext(), Botan::BufferSlicer::empty(), Botan::KyberConstants::polynomial_compressed_bytes(), Botan::KyberConstants::polynomial_vector_compressed_bytes(), Botan::StrongSpan< T >::size(), and Botan::BufferSlicer::take().

Referenced by Botan::Kyber_KEM_Decryptor::decapsulate().

to_bytes() [1/2]

KyberCompressedCiphertext Botan::Ciphertext::to_bytes ( )

inline

Definition at line 584 of file kyber_structures.h.

                                           {
         KyberCompressedCiphertext r(m_mode.encapsulated_key_length());
         to_bytes(r);
         return r;
      }

References Botan::KyberConstants::encapsulated_key_length(), and to_bytes().

Referenced by to_bytes().

to_bytes() [2/2]

void Botan::Ciphertext::to_bytes ( StrongSpan< KyberCompressedCiphertext > out )

inline

Definition at line 577 of file kyber_structures.h.

                                                               {
         BufferStuffer bs(out);
         compress(bs.next(m_mode.polynomial_vector_compressed_bytes()), m_b, m_mode);
         compress(bs.next(m_mode.polynomial_compressed_bytes()), m_v, m_mode);
         BOTAN_ASSERT_NOMSG(bs.full());
      }

References BOTAN_ASSERT_NOMSG, Botan::BufferStuffer::full(), Botan::BufferStuffer::next(), Botan::KyberConstants::polynomial_compressed_bytes(), and Botan::KyberConstants::polynomial_vector_compressed_bytes().

v()

Polynomial & Botan::Ciphertext::v ( )

inline

Definition at line 592 of file kyber_structures.h.

{ return m_v; }

Referenced by Botan::Kyber_PrivateKeyInternal::indcpa_decrypt().

---

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

• src/lib/pubkey/kyber/kyber_common/kyber_structures.h