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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <random>
#include "core/hle/hle.h"
#include "core/hle/service/ssl_c.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
// Namespace SSL_C
namespace SSL_C {
// TODO: Implement a proper CSPRNG in the future when actual security is needed
static std::mt19937 rand_gen;
static void Initialize(Service::Interface* self) {
u32* cmd_buff = Kernel::GetCommandBuffer();
// Seed random number generator when the SSL service is initialized
std::random_device rand_device;
rand_gen.seed(rand_device());
// Stub, return success
cmd_buff[1] = RESULT_SUCCESS.raw;
}
static void GenerateRandomData(Service::Interface* self) {
u32* cmd_buff = Kernel::GetCommandBuffer();
u32 size = cmd_buff[1];
VAddr address = cmd_buff[3];
u8* output_buff = Memory::GetPointer(address);
// Fill the output buffer with random data.
u32 data = 0;
u32 i = 0;
while (i < size) {
if ((i % 4) == 0) {
// The random number generator returns 4 bytes worth of data, so generate new random data when i == 0 and when i is divisible by 4
data = rand_gen();
}
if (size > 4) {
// Use up the entire 4 bytes of the random data for as long as possible
*(u32*)(output_buff + i) = data;
i += 4;
} else if (size == 2) {
*(u16*)(output_buff + i) = (u16)(data & 0xffff);
i += 2;
} else {
*(u8*)(output_buff + i) = (u8)(data & 0xff);
i++;
}
}
// Stub, return success
cmd_buff[1] = RESULT_SUCCESS.raw;
}
const Interface::FunctionInfo FunctionTable[] = {
{0x00010002, Initialize, "Initialize"},
{0x000200C2, nullptr, "CreateContext"},
{0x00050082, nullptr, "AddTrustedRootCA"},
{0x00110042, GenerateRandomData, "GenerateRandomData"},
{0x00150082, nullptr, "Read"},
{0x00170082, nullptr, "Write"},
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// Interface class
Interface::Interface() {
Register(FunctionTable);
}
} // namespace
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