WiiUIdent/source/Utils.cpp

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2023-03-30 21:40:17 +02:00
#include "Utils.hpp"
#include <cstring>
#include <mbedtls/aes.h>
#include <mbedtls/sha256.h>
namespace Utils
{
std::string ToHexString(const void* data, size_t size)
{
std::string str;
for (size_t i = 0; i < size; ++i)
str += Utils::sprintf("%02x", ((const uint8_t*) data)[i]);
return str;
}
int AESDecrypt(const void* key, unsigned keybits, const void* iv, const void* in, void* out, size_t dataSize)
{
int res;
mbedtls_aes_context ctx;
mbedtls_aes_init(&ctx);
if ((res = mbedtls_aes_setkey_dec(&ctx, (const unsigned char*)key, keybits)) != 0) {
mbedtls_aes_free(&ctx);
return res;
}
unsigned char tmpiv[16];
if (iv) {
memcpy(tmpiv, iv, sizeof(tmpiv));
} else {
memset(tmpiv, 0, sizeof(tmpiv));
}
res = mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_DECRYPT, dataSize, tmpiv, (const unsigned char*)in, (unsigned char*)out);
mbedtls_aes_free(&ctx);
return res;
}
int SHA256(const void* in, size_t inSize, void* out, size_t outSize)
{
if (outSize != 32) {
return -1;
}
int res;
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
if ((res = mbedtls_sha256_starts_ret(&ctx, 0)) != 0) {
mbedtls_sha256_free(&ctx);
return res;
}
if ((res = mbedtls_sha256_update_ret(&ctx, (const unsigned char*)in, inSize)) != 0) {
mbedtls_sha256_free(&ctx);
return res;
}
res = mbedtls_sha256_finish_ret(&ctx, (unsigned char*)out);
mbedtls_sha256_free(&ctx);
return res;
}
}