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/*
* Key Derivation Function interfaces
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_KDF_BASE_H__
#define BOTAN_KDF_BASE_H__
#include <botan/secmem.h>
#include <botan/types.h>
#include <string>
namespace Botan {
/**
* Key Derivation Function
*/
class BOTAN_DLL KDF
{
public:
virtual ~KDF() {}
/**
* Create an instance based on a name
* If provider is empty then best available is chosen.
* @param algo_spec algorithm name
* @param provider provider implementation to choose
* @return a null pointer if the algo/provider combination cannot be found
*/
static std::unique_ptr<KDF>
create(const std::string& algo_spec,
const std::string& provider = "");
/**
* Create an instance based on a name, or throw if the
* algo/provider combination cannot be found. If provider is
* empty then best available is chosen.
*/
static std::unique_ptr<KDF>
create_or_throw(const std::string& algo_spec,
const std::string& provider = "");
/**
* @return list of available providers for this algorithm, empty if not available
*/
static std::vector<std::string> providers(const std::string& algo_spec);
/**
* @return KDF name
*/
virtual std::string name() const = 0;
/**
* Derive a key
* @param key buffer holding the derived key, must be of length key_len
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param secret_len size of secret in bytes
* @param salt a diversifier
* @param salt_len size of salt in bytes
* @param label purpose for the derived keying material
* @param label_len size of label in bytes
* @return the derived key
*/
virtual size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
const byte salt[], size_t salt_len,
const byte label[], size_t label_len) const = 0;
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param secret_len size of secret in bytes
* @param salt a diversifier
* @param salt_len size of salt in bytes
* @param label purpose for the derived keying material
* @param label_len size of label in bytes
* @return the derived key
*/
secure_vector<byte> derive_key(size_t key_len,
const byte secret[],
size_t secret_len,
const byte salt[],
size_t salt_len,
const byte label[] = nullptr,
size_t label_len = 0) const
{
secure_vector<byte> key(key_len);
key.resize(kdf(key.data(), key.size(), secret, secret_len, salt, salt_len, label, label_len));
return key;
}
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
* @param label purpose for the derived keying material
* @return the derived key
*/
secure_vector<byte> derive_key(size_t key_len,
const secure_vector<byte>& secret,
const std::string& salt = "",
const std::string& label = "") const
{
return derive_key(key_len, secret.data(), secret.size(),
reinterpret_cast<const byte*>(salt.data()),
salt.length(),
reinterpret_cast<const byte*>(label.data()),
label.length());
}
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
* @param label purpose for the derived keying material
* @return the derived key
*/
template<typename Alloc, typename Alloc2, typename Alloc3>
secure_vector<byte> derive_key(size_t key_len,
const std::vector<byte, Alloc>& secret,
const std::vector<byte, Alloc2>& salt,
const std::vector<byte, Alloc3>& label) const
{
return derive_key(key_len,
secret.data(), secret.size(),
salt.data(), salt.size(),
label.data(), label.size());
}
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
* @param salt_len size of salt in bytes
* @param label purpose for the derived keying material
* @return the derived key
*/
secure_vector<byte> derive_key(size_t key_len,
const secure_vector<byte>& secret,
const byte salt[],
size_t salt_len,
const std::string& label = "") const
{
return derive_key(key_len,
secret.data(), secret.size(),
salt, salt_len,
reinterpret_cast<const byte*>(label.data()),
label.size());
}
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param secret_len size of secret in bytes
* @param salt a diversifier
* @param label purpose for the derived keying material
* @return the derived key
*/
secure_vector<byte> derive_key(size_t key_len,
const byte secret[],
size_t secret_len,
const std::string& salt = "",
const std::string& label = "") const
{
return derive_key(key_len, secret, secret_len,
reinterpret_cast<const byte*>(salt.data()),
salt.length(),
reinterpret_cast<const byte*>(label.data()),
label.length());
}
/**
* @return new object representing the same algorithm as *this
*/
virtual KDF* clone() const = 0;
};
/**
* Factory method for KDF (key derivation function)
* @param algo_spec the name of the KDF to create
* @return pointer to newly allocated object of that type
*/
BOTAN_DLL KDF* get_kdf(const std::string& algo_spec);
}
#endif
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