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#include <cstdint>
namespace axolotl {
struct Curve25519PublicKey {
static const int LENGTH = 32;
std::uint8_t public_key[32];
};
struct Curve25519KeyPair : public Curve25519PublicKey {
std::uint8_t private_key[32];
};
Curve25519KeyPair generate_key(
std::uint8_t const * random_32_bytes
);
const std::size_t CURVE25519_SHARED_SECRET_LENGTH = 16;
void curve25519_shared_secret(
Curve25519KeyPair const & our_key,
Curve25519PublicKey const & their_key,
std::uint8_t * output
);
struct Aes256Key {
static const int LENGTH = 32;
std::uint8_t key[32];
};
struct Aes256Iv {
static const int LENGTH = 16;
std::uint8_t iv[16];
};
std::size_t aes_pkcs_7_padded_length(
std::size_t input_length
);
void aes_pkcs_7_padding(
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output
);
void aes_encrypt_cbc(
Aes256Key const & key,
Aes256Iv const & iv,
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output
);
void aes_decrypt_cbc(
Aes256Key const & key,
Aes256Iv const & iv,
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output
);
const std::size_t HMAC_SHA256_OUTPUT_LENGTH = 32;
void hmac_sha256(
std::uint8_t const * key, std::size_t key_length,
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output
);
void hkdf_sha256(
std::uint8_t const * input, std::size_t input_length,
std::uint8_t const * info, std::size_t info_length,
std::uint8_t const * salt, std::size_t salt_length,
std::uint8_t * output, std::size_t output_length
);
} // namespace axolotl
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