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/**
* (C) 2018 Jack Lloyd
* (C) 2018 Ribose Inc
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SCRYPT_H_
#define BOTAN_SCRYPT_H_
#include <botan/pwdhash.h>
namespace Botan {
/**
* Scrypt key derivation function (RFC 7914)
*/
class BOTAN_PUBLIC_API(2,8) Scrypt final : public PasswordHash
{
public:
Scrypt(size_t N, size_t r, size_t p);
Scrypt(const Scrypt& other) = default;
Scrypt& operator=(const Scrypt&) = default;
/**
* Derive a new key under the current Scrypt parameter set
*/
void derive_key(uint8_t out[], size_t out_len,
const char* password, const size_t password_len,
const uint8_t salt[], size_t salt_len) const override;
std::string to_string() const override;
size_t N() const { return m_N; }
size_t r() const { return m_r; }
size_t p() const { return m_p; }
size_t iterations() const override { return r(); }
size_t parallelism() const override { return p(); }
size_t memory_param() const override { return N(); }
size_t total_memory_usage() const override;
private:
size_t m_N, m_r, m_p;
};
class BOTAN_PUBLIC_API(2,8) Scrypt_Family final : public PasswordHashFamily
{
public:
std::string name() const override;
std::unique_ptr<PasswordHash> tune(size_t output_length,
std::chrono::milliseconds msec,
size_t max_memory) const override;
std::unique_ptr<PasswordHash> default_params() const override;
std::unique_ptr<PasswordHash> from_iterations(size_t iter) const override;
std::unique_ptr<PasswordHash> from_params(
size_t N, size_t r, size_t p) const override;
};
/**
* Scrypt key derivation function (RFC 7914)
*
* @param output the output will be placed here
* @param output_len length of output
* @param password the user password
* @param salt the salt
* @param salt_len length of salt
* @param N the CPU/Memory cost parameter, must be power of 2
* @param r the block size parameter
* @param p the parallelization parameter
*
* Suitable parameters for most uses would be N = 32768, r = 8, p = 1
*
* Scrypt uses approximately (p + N + 1) * 128 * r bytes of memory
*/
void BOTAN_PUBLIC_API(2,8) scrypt(uint8_t output[], size_t output_len,
const char* password, size_t password_len,
const uint8_t salt[], size_t salt_len,
size_t N, size_t r, size_t p);
/**
* Scrypt key derivation function (RFC 7914)
* Before 2.8 this function was the primary interface for scrypt
*
* @param output the output will be placed here
* @param output_len length of output
* @param password the user password
* @param salt the salt
* @param salt_len length of salt
* @param N the CPU/Memory cost parameter, must be power of 2
* @param r the block size parameter
* @param p the parallelization parameter
*
* Suitable parameters for most uses would be N = 32768, r = 8, p = 1
*
* Scrypt uses approximately (p + N + 1) * 128 * r bytes of memory
*/
inline void scrypt(uint8_t output[], size_t output_len,
const std::string& password,
const uint8_t salt[], size_t salt_len,
size_t N, size_t r, size_t p)
{
return scrypt(output, output_len,
password.c_str(), password.size(),
salt, salt_len,
N, r, p);
}
inline size_t scrypt_memory_usage(size_t N, size_t r, size_t p)
{
return 128 * r * (N + p);
}
}
#endif
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