transmission/libtransmission/crypto-utils.h

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// This file Copyright © 2007-2023 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#ifndef TR_CRYPTO_UTILS_H
#define TR_CRYPTO_UTILS_H
#include <array>
#include <cstddef> // size_t
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#include <cstdint>
#include <limits>
#include <memory>
#include <optional>
#include <random> // for std::uniform_int_distribution<T>
#include <string>
#include <string_view>
#include "transmission.h" // tr_sha1_digest_t
/**
* @addtogroup utils Utilities
* @{
*/
class tr_sha1
{
public:
static std::unique_ptr<tr_sha1> create();
virtual ~tr_sha1() = default;
virtual void clear() = 0;
virtual void add(void const* data, size_t data_length) = 0;
[[nodiscard]] virtual tr_sha1_digest_t finish() = 0;
template<typename... T>
[[nodiscard]] static tr_sha1_digest_t digest(T const&... args)
{
auto context = tr_sha1::create();
(context->add(std::data(args), std::size(args)), ...);
return context->finish();
}
};
class tr_sha256
{
public:
static std::unique_ptr<tr_sha256> create();
virtual ~tr_sha256() = default;
virtual void clear() = 0;
virtual void add(void const* data, size_t data_length) = 0;
[[nodiscard]] virtual tr_sha256_digest_t finish() = 0;
template<typename... T>
[[nodiscard]] static tr_sha256_digest_t digest(T const&... args)
{
auto context = tr_sha256::create();
(context->add(std::data(args), std::size(args)), ...);
return context->finish();
}
};
/** @brief Opaque SSL context type. */
using tr_ssl_ctx_t = void*;
/** @brief Opaque X509 certificate store type. */
using tr_x509_store_t = void*;
/** @brief Opaque X509 certificate type. */
using tr_x509_cert_t = void*;
/**
* @brief Get X509 certificate store from SSL context.
*/
tr_x509_store_t tr_ssl_get_x509_store(tr_ssl_ctx_t handle);
/**
* @brief Add certificate to X509 certificate store.
*/
bool tr_x509_store_add(tr_x509_store_t handle, tr_x509_cert_t cert);
/**
* @brief Allocate and initialize new X509 certificate from DER-encoded buffer.
*/
tr_x509_cert_t tr_x509_cert_new(void const* der, size_t der_length);
/**
* @brief Free X509 certificate returned by @ref tr_x509_cert_new.
*/
void tr_x509_cert_free(tr_x509_cert_t handle);
/**
* @brief Fill a buffer with random bytes.
*/
void tr_rand_buffer(void* buffer, size_t length);
// Client code should use `tr_rand_buffer()`.
// These helpers are only exposed here to permit open-box tests.
bool tr_rand_buffer_crypto(void* buffer, size_t length);
void tr_rand_buffer_std(void* buffer, size_t length);
template<typename T>
T tr_rand_obj()
{
auto t = T{};
tr_rand_buffer(&t, sizeof(T));
return t;
}
/**
* @brief Generate a SSHA password from its plaintext source.
*/
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[[nodiscard]] std::string tr_ssha1(std::string_view plaintext);
/**
* @brief Return true if this is salted text, false otherwise
*/
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[[nodiscard]] bool tr_ssha1_test(std::string_view text);
/**
* @brief Validate a test password against the a ssha1 password.
*/
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[[nodiscard]] bool tr_ssha1_matches(std::string_view ssha1, std::string_view plaintext);
/**
* @brief Translate null-terminated string into base64.
* @return a new std::string with the encoded contents
*/
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[[nodiscard]] std::string tr_base64_encode(std::string_view input);
/**
* @brief Translate a character range from base64 into raw form.
* @return a new std::string with the decoded contents.
*/
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[[nodiscard]] std::string tr_base64_decode(std::string_view input);
/**
* @brief Generate an ascii hex string for a sha1 digest.
*/
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[[nodiscard]] std::string tr_sha1_to_string(tr_sha1_digest_t const&);
/**
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* @brief Generate a sha1 digest from a hex string.
*/
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[[nodiscard]] std::optional<tr_sha1_digest_t> tr_sha1_from_string(std::string_view hex);
/**
* @brief Generate an ascii hex string for a sha256 digest.
*/
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[[nodiscard]] std::string tr_sha256_to_string(tr_sha256_digest_t const&);
/**
* @brief Generate a sha256 digest from a hex string.
*/
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[[nodiscard]] std::optional<tr_sha256_digest_t> tr_sha256_from_string(std::string_view hex);
// Convenience utility to efficiently get many random small values.
// Use this instead of making a lot of calls to tr_rand_int().
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template<typename T = uint8_t, size_t N = 1024U>
class tr_salt_shaker
{
public:
[[nodiscard]] auto operator()() noexcept
{
if (pos == std::size(buf))
{
pos = 0U;
}
if (pos == 0U)
{
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tr_rand_buffer(std::data(buf), std::size(buf) * sizeof(T));
}
return buf[pos++];
}
private:
size_t pos = 0;
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std::array<T, N> buf;
};
// UniformRandomBitGenerator impl that uses `tr_rand_buffer()`.
// See https://en.cppreference.com/w/cpp/named_req/UniformRandomBitGenerator
template<typename T, size_t N = 1024U>
class tr_urbg
{
public:
using result_type = T;
static_assert(!std::numeric_limits<T>::is_signed);
[[nodiscard]] static constexpr T min() noexcept
{
return std::numeric_limits<T>::min();
}
[[nodiscard]] static constexpr T max() noexcept
{
return std::numeric_limits<T>::max();
}
[[nodiscard]] T operator()() noexcept
{
return buf_();
}
private:
tr_salt_shaker<T, N> buf_;
};
/**
* @brief Returns a random number in the range of [0...upper_bound).
*/
template<class T>
[[nodiscard]] T tr_rand_int(T upper_bound)
{
static_assert(!std::is_signed<T>());
using dist_type = std::uniform_int_distribution<T>;
thread_local auto rng = tr_urbg<T>{};
thread_local auto dist = dist_type{};
return dist(rng, typename dist_type::param_type(0, upper_bound - 1));
}
/** @} */
#endif /* TR_CRYPTO_UTILS_H */