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ImHex/plugins/libimhex/source/helpers/crypto.cpp

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#include <hex/helpers/crypto.hpp>
#include <hex/providers/provider.hpp>
#include <hex/helpers/utils.hpp>
#include <mbedtls/version.h>
#include <mbedtls/base64.h>
#include <mbedtls/bignum.h>
#include <mbedtls/md5.h>
#include <mbedtls/sha1.h>
#include <mbedtls/sha256.h>
#include <mbedtls/sha512.h>
#include <mbedtls/aes.h>
#include <mbedtls/cipher.h>
#include <array>
#include <span>
#if MBEDTLS_VERSION_MAJOR <= 2
#define mbedtls_md5_starts mbedtls_md5_starts_ret
#define mbedtls_md5_update mbedtls_md5_update_ret
#define mbedtls_md5_finish mbedtls_md5_finish_ret
#define mbedtls_sha1_starts mbedtls_sha1_starts_ret
#define mbedtls_sha1_update mbedtls_sha1_update_ret
#define mbedtls_sha1_finish mbedtls_sha1_finish_ret
#define mbedtls_sha256_starts mbedtls_sha256_starts_ret
#define mbedtls_sha256_update mbedtls_sha256_update_ret
#define mbedtls_sha256_finish mbedtls_sha256_finish_ret
#define mbedtls_sha512_starts mbedtls_sha512_starts_ret
#define mbedtls_sha512_update mbedtls_sha512_update_ret
#define mbedtls_sha512_finish mbedtls_sha512_finish_ret
#endif
namespace hex::crypt {
u16 crc16(prv::Provider* &data, u64 offset, size_t size, u16 polynomial, u16 init) {
const auto table = [polynomial] {
std::array<u16, 256> table;
for (u16 i = 0; i < 256; i++) {
u16 crc = 0;
u16 c = i;
for (u16 j = 0; j < 8; j++) {
if (((crc ^ c) & 0x0001U) != 0)
crc = (crc >> 1U) ^ polynomial;
else
crc >>= 1U;
c >>= 1U;
}
table[i] = crc;
}
return table;
}();
u16 crc = init;
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; offset < size; offset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
for (size_t i = 0; i < readSize; i++) {
crc = (crc >> 8) ^ table[(crc ^ u16(buffer[i])) & 0x00FF];
}
}
return crc;
}
u32 crc32(prv::Provider* &data, u64 offset, size_t size, u32 polynomial, u32 init) {
const auto table = [polynomial] {
std::array<uint32_t, 256> table = {0};
for (uint32_t i = 0; i < 256; i++) {
uint32_t c = i;
for (size_t j = 0; j < 8; j++) {
if (c & 1)
c = polynomial ^ (c >> 1);
else
c >>= 1;
}
table[i] = c;
}
return table;
}();
uint32_t c = init;
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; offset < size; offset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
for (size_t i = 0; i < readSize; i++) {
c = table[(c ^ buffer[i]) & 0xFF] ^ (c >> 8);
}
}
return ~c;
}
std::array<u8, 16> md5(prv::Provider* &data, u64 offset, size_t size) {
std::array<u8, 16> result = { 0 };
mbedtls_md5_context ctx;
mbedtls_md5_init(&ctx);
mbedtls_md5_starts(&ctx);
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; bufferOffset < size; bufferOffset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
mbedtls_md5_update(&ctx, buffer.data(), readSize);
}
mbedtls_md5_finish(&ctx, result.data());
mbedtls_md5_free(&ctx);
return result;
}
std::array<u8, 16> md5(const std::vector<u8> &data) {
std::array<u8, 16> result = { 0 };
mbedtls_md5_context ctx;
mbedtls_md5_init(&ctx);
mbedtls_md5_starts(&ctx);
mbedtls_md5_update(&ctx, data.data(), data.size());
mbedtls_md5_finish(&ctx, result.data());
mbedtls_md5_free(&ctx);
return result;
}
std::array<u8, 20> sha1(prv::Provider* &data, u64 offset, size_t size) {
std::array<u8, 20> result = { 0 };
mbedtls_sha1_context ctx;
mbedtls_sha1_init(&ctx);
mbedtls_sha1_starts(&ctx);
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; bufferOffset < size; bufferOffset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
mbedtls_sha1_update(&ctx, buffer.data(), readSize);
}
mbedtls_sha1_finish(&ctx, result.data());
mbedtls_sha1_free(&ctx);
return result;
}
std::array<u8, 20> sha1(const std::vector<u8> &data) {
std::array<u8, 20> result = { 0 };
mbedtls_sha1_context ctx;
mbedtls_sha1_init(&ctx);
mbedtls_sha1_starts(&ctx);
mbedtls_sha1_update(&ctx, data.data(), data.size());
mbedtls_sha1_finish(&ctx, result.data());
mbedtls_sha1_free(&ctx);
return result;
}
std::array<u8, 28> sha224(prv::Provider* &data, u64 offset, size_t size) {
std::array<u8, 28> result = { 0 };
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
mbedtls_sha256_starts(&ctx, true);
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; bufferOffset < size; bufferOffset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
mbedtls_sha256_update(&ctx, buffer.data(), readSize);
}
mbedtls_sha256_finish(&ctx, result.data());
mbedtls_sha256_free(&ctx);
return result;
}
std::array<u8, 28> sha224(const std::vector<u8> &data) {
std::array<u8, 28> result = { 0 };
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
mbedtls_sha256_starts(&ctx, true);
mbedtls_sha256_update(&ctx, data.data(), data.size());
mbedtls_sha256_finish(&ctx, result.data());
mbedtls_sha256_free(&ctx);
return result;
}
std::array<u8, 32> sha256(prv::Provider* &data, u64 offset, size_t size) {
std::array<u8, 32> result = { 0 };
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
mbedtls_sha256_starts(&ctx, false);
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; bufferOffset < size; bufferOffset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
mbedtls_sha256_update(&ctx, buffer.data(), readSize);
}
mbedtls_sha256_finish(&ctx, result.data());
mbedtls_sha256_free(&ctx);
return result;
}
std::array<u8, 32> sha256(const std::vector<u8> &data) {
std::array<u8, 32> result = { 0 };
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
mbedtls_sha256_starts(&ctx, false);
mbedtls_sha256_update(&ctx, data.data(), data.size());
mbedtls_sha256_finish(&ctx, result.data());
mbedtls_sha256_free(&ctx);
return result;
}
std::array<u8, 48> sha384(prv::Provider* &data, u64 offset, size_t size) {
std::array<u8, 48> result = { 0 };
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts(&ctx, true);
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; bufferOffset < size; bufferOffset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
mbedtls_sha512_update(&ctx, buffer.data(), readSize);
}
mbedtls_sha512_finish(&ctx, result.data());
mbedtls_sha512_free(&ctx);
return result;
}
std::array<u8, 48> sha384(const std::vector<u8> &data) {
std::array<u8, 48> result = { 0 };
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts(&ctx, true);
mbedtls_sha512_update(&ctx, data.data(), data.size());
mbedtls_sha512_finish(&ctx, result.data());
mbedtls_sha512_free(&ctx);
return result;
}
std::array<u8, 64> sha512(prv::Provider* &data, u64 offset, size_t size) {
std::array<u8, 64> result = { 0 };
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts(&ctx, false);
std::array<u8, 512> buffer = { 0 };
for (u64 bufferOffset = 0; bufferOffset < size; bufferOffset += buffer.size()) {
const u64 readSize = std::min(u64(buffer.size()), size - bufferOffset);
data->read(offset + bufferOffset, buffer.data(), readSize);
mbedtls_sha512_update(&ctx, buffer.data(), readSize);
}
mbedtls_sha512_finish(&ctx, result.data());
mbedtls_sha512_free(&ctx);
return result;
}
std::array<u8, 64> sha512(const std::vector<u8> &data) {
std::array<u8, 64> result = { 0 };
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts(&ctx, false);
mbedtls_sha512_update(&ctx, data.data(), data.size());
mbedtls_sha512_finish(&ctx, result.data());
mbedtls_sha512_free(&ctx);
return result;
}
std::vector<u8> decode64(const std::vector<u8> &input) {
size_t outputSize = (3 * input.size()) / 4;
std::vector<u8> output(outputSize + 1, 0x00);
size_t written = 0;
if (mbedtls_base64_decode(output.data(), output.size(), &written, reinterpret_cast<const unsigned char *>(input.data()), input.size()))
return { };
return output;
}
std::vector<u8> encode64(const std::vector<u8> &input) {
size_t outputSize = 4 * ((input.size() + 2) / 3);
std::vector<u8> output(outputSize + 1, 0x00);
size_t written = 0;
if (mbedtls_base64_encode(output.data(), output.size(), &written, reinterpret_cast<const unsigned char *>(input.data()), input.size()))
return { };
return output;
}
std::vector<u8> decode16(const std::string &input) {
std::vector<u8> output(input.length() / 2, 0x00);
mbedtls_mpi ctx;
mbedtls_mpi_init(&ctx);
ON_SCOPE_EXIT { mbedtls_mpi_free(&ctx); };
if (mbedtls_mpi_read_string(&ctx, 16, input.c_str()))
return { };
if (mbedtls_mpi_write_binary(&ctx, output.data(), output.size()))
return { };
return output;
}
std::string encode16(const std::vector<u8> &input) {
std::string output(input.size() * 2 + 1, 0x00);
mbedtls_mpi ctx;
mbedtls_mpi_init(&ctx);
ON_SCOPE_EXIT { mbedtls_mpi_free(&ctx); };
if (mbedtls_mpi_read_binary(&ctx, input.data(), input.size()))
return { };
size_t written = 0;
if (mbedtls_mpi_write_string(&ctx, 16, output.data(), output.size(), &written))
return { };
return output;
}
static std::vector<u8> aes(mbedtls_cipher_type_t type, mbedtls_operation_t operation, const std::vector<u8> &key, std::array<u8, 8> nonce, std::array<u8, 8> iv, const std::vector<u8> &input) {
std::vector<u8> output;
if (input.empty())
return { };
mbedtls_cipher_context_t ctx;
auto cipherInfo = mbedtls_cipher_info_from_type(type);
mbedtls_cipher_setup(&ctx, cipherInfo);
mbedtls_cipher_setkey(&ctx, key.data(), key.size() * 8, operation);
std::array<u8, 16> nonceCounter = { 0 };
std::copy(nonce.begin(), nonce.end(), nonceCounter.begin());
std::copy(iv.begin(), iv.end(), nonceCounter.begin() + 8);
size_t outputSize = input.size() + mbedtls_cipher_get_block_size(&ctx);
output.resize(outputSize, 0x00);
mbedtls_cipher_crypt(&ctx, nonceCounter.data(), nonceCounter.size(), input.data(), input.size(), output.data(), &outputSize);
mbedtls_cipher_free(&ctx);
output.resize(input.size());
return output;
}
std::vector<u8> aesDecrypt(AESMode mode, KeyLength keyLength, const std::vector<u8> &key, std::array<u8, 8> nonce, std::array<u8, 8> iv, const std::vector<u8> &input) {
switch (keyLength) {
case KeyLength::Key128Bits: if (key.size() != 128 / 8) return { }; break;
case KeyLength::Key192Bits: if (key.size() != 192 / 8) return { }; break;
case KeyLength::Key256Bits: if (key.size() != 256 / 8) return { }; break;
default: return { };
}
mbedtls_cipher_type_t type;
switch (mode) {
case AESMode::ECB: type = MBEDTLS_CIPHER_AES_128_ECB; break;
case AESMode::CBC: type = MBEDTLS_CIPHER_AES_128_CBC; break;
case AESMode::CFB128: type = MBEDTLS_CIPHER_AES_128_CFB128; break;
case AESMode::CTR: type = MBEDTLS_CIPHER_AES_128_CTR; break;
case AESMode::GCM: type = MBEDTLS_CIPHER_AES_128_GCM; break;
case AESMode::CCM: type = MBEDTLS_CIPHER_AES_128_CCM; break;
case AESMode::OFB: type = MBEDTLS_CIPHER_AES_128_OFB; break;
case AESMode::XTS: type = MBEDTLS_CIPHER_AES_128_XTS; break;
default: return { };
}
type = mbedtls_cipher_type_t(type + u8(keyLength));
return aes(type, MBEDTLS_DECRYPT, key, nonce, iv, input);
}
}
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