58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
#pragma once
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#ifndef MESSMER_CPPUTILS_CRYPTO_KDF_SCRYPT_H
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#define MESSMER_CPPUTILS_CRYPTO_KDF_SCRYPT_H
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#include "../../macros.h"
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#include "../../random/Random.h"
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extern "C" {
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#include <messmer/scrypt/lib/crypto/crypto_scrypt.h>
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}
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#include <stdexcept>
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#include "DerivedKey.h"
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namespace cpputils {
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struct SCryptParanoidSettings {
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constexpr static size_t SALT_LEN = 32; // Size of the salt
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constexpr static uint64_t N = 1048576; // CPU/Memory cost
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constexpr static uint32_t r = 8; // Blocksize
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constexpr static uint32_t p = 16; // Parallelization
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};
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struct SCryptDefaultSettings {
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constexpr static size_t SALT_LEN = 32; // Size of the salt
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constexpr static uint64_t N = 524288; // CPU/Memory cost
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constexpr static uint32_t r = 1; // Blocksize
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constexpr static uint32_t p = 1; // Parallelization
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};
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class SCrypt {
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public:
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SCrypt() {}
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template<size_t KEYSIZE, class Settings = SCryptDefaultSettings> DerivedKey<KEYSIZE> generateKey(const std::string &password) {
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auto salt = Random::PseudoRandom().get(Settings::SALT_LEN);
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auto config = DerivedKeyConfig(std::move(salt), Settings::N, Settings::r, Settings::p);
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auto key = generateKeyFromConfig<KEYSIZE>(password, config);
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return DerivedKey<KEYSIZE>(std::move(config), key);
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}
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template<size_t KEYSIZE> FixedSizeData<KEYSIZE> generateKeyFromConfig(const std::string &password, const DerivedKeyConfig &config) {
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auto key = FixedSizeData<KEYSIZE>::Null();
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int errorcode = crypto_scrypt(reinterpret_cast<const uint8_t*>(password.c_str()), password.size(),
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reinterpret_cast<const uint8_t*>(config.salt().data()), config.salt().size(),
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config.N(), config.r(), config.p(),
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static_cast<uint8_t*>(key.data()), KEYSIZE);
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if (errorcode != 0) {
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throw std::runtime_error("Error running scrypt key derivation.");
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}
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return key;
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(SCrypt);
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};
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}
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#endif
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