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/*
* (C) 2015,2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/ffi.h>
#include <botan/internal/ffi_util.h>
#include <botan/internal/ffi_rng.h>
#include <botan/system_rng.h>
#include <botan/auto_rng.h>
#if defined(BOTAN_HAS_RDRAND_RNG)
#include <botan/rdrand_rng.h>
#endif
extern "C" {
using namespace Botan_FFI;
int botan_rng_init(botan_rng_t* rng_out, const char* rng_type)
{
return ffi_guard_thunk(__func__, [=]() -> int {
if(rng_out == nullptr)
return BOTAN_FFI_ERROR_NULL_POINTER;
const std::string rng_type_s(rng_type ? rng_type : "system");
std::unique_ptr<Botan::RandomNumberGenerator> rng;
if(rng_type_s == "system")
{
rng.reset(new Botan::System_RNG);
}
else if(rng_type_s == "user")
{
rng.reset(new Botan::AutoSeeded_RNG);
}
else if(rng_type_s == "null")
{
rng.reset(new Botan::Null_RNG);
}
#if defined(BOTAN_HAS_RDRAND_RNG)
else if(rng_type_s == "rdrand" && Botan::RDRAND_RNG::available())
{
rng.reset(new Botan::RDRAND_RNG);
}
#endif
#if defined(BOTAN_TARGET_OS_HAS_THREADS)
else if(rng_type_s == "user-threadsafe")
{
rng.reset(new Botan::Serialized_RNG(new Botan::AutoSeeded_RNG));
}
#endif
if(!rng)
{
return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
}
*rng_out = new botan_rng_struct(rng.release());
return BOTAN_FFI_SUCCESS;
});
}
int botan_rng_destroy(botan_rng_t rng)
{
return BOTAN_FFI_CHECKED_DELETE(rng);
}
int botan_rng_get(botan_rng_t rng, uint8_t* out, size_t out_len)
{
return BOTAN_FFI_DO(Botan::RandomNumberGenerator, rng, r, { r.randomize(out, out_len); });
}
int botan_rng_reseed(botan_rng_t rng, size_t bits)
{
return BOTAN_FFI_DO(Botan::RandomNumberGenerator, rng, r, { r.reseed_from_rng(Botan::system_rng(), bits); });
}
int botan_rng_add_entropy(botan_rng_t rng, const uint8_t* input, size_t len)
{
return BOTAN_FFI_DO(Botan::RandomNumberGenerator, rng, r, { r.add_entropy(input, len); });
}
int botan_rng_reseed_from_rng(botan_rng_t rng, botan_rng_t source_rng, size_t bits)
{
return BOTAN_FFI_DO(Botan::RandomNumberGenerator, rng, r, { r.reseed_from_rng(safe_get(source_rng), bits); });
}
}
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