Method Encrypt

src/crypto/chacha20poly1305.cpp:69–81

} // namespace

void AEADChaCha20Poly1305::Encrypt(std::span<const std::byte> plain1, std::span<const std::byte> plain2, std::span<const std::byte> aad, Nonce96 nonce, std::span<std::byte> cipher) noexcept
{
    assert(cipher.size() == plain1.size() + plain2.size() + EXPANSION);

    // Encrypt using ChaCha20 (starting at block 1).
    m_chacha20.Seek(nonce, 1);
    m_chacha20.Crypt(plain1, cipher.first(plain1.size()));
    m_chacha20.Crypt(plain2, cipher.subspan(plain1.size()).first(plain2.size()));

    // Seek to block 0, and compute tag using key drawn from there.
    m_chacha20.Seek(nonce, 0);
    ComputeTag(m_chacha20, aad, cipher.first(cipher.size() - EXPANSION), cipher.last(EXPANSION));
}

bool AEADChaCha20Poly1305::Decrypt(std::span<const std::byte> cipher, std::span<const std::byte> aad, Nonce96 nonce, std::span<std::byte> plain1, std::span<std::byte> plain2) noexcept
{