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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmCryptoHash.h"
#include <cm/memory>
#include <cm3p/kwiml/int.h>
#include <cm3p/rhash.h>
#include "cmsys/FStream.hxx"
static unsigned int const cmCryptoHashAlgoToId[] = {
/* clang-format needs this comment to break after the opening brace */
RHASH_MD5, //
RHASH_SHA1, //
RHASH_SHA224, //
RHASH_SHA256, //
RHASH_SHA384, //
RHASH_SHA512, //
RHASH_SHA3_224, //
RHASH_SHA3_256, //
RHASH_SHA3_384, //
RHASH_SHA3_512
};
static int cmCryptoHash_rhash_library_initialized;
static rhash cmCryptoHash_rhash_init(unsigned int id)
{
if (!cmCryptoHash_rhash_library_initialized) {
cmCryptoHash_rhash_library_initialized = 1;
rhash_library_init();
}
return rhash_init(id);
}
cmCryptoHash::cmCryptoHash(Algo algo)
: Id(cmCryptoHashAlgoToId[algo])
, CTX(cmCryptoHash_rhash_init(this->Id))
{
}
cmCryptoHash::~cmCryptoHash()
{
rhash_free(this->CTX);
}
std::unique_ptr<cmCryptoHash> cmCryptoHash::New(cm::string_view algo)
{
if (algo == "MD5") {
return cm::make_unique<cmCryptoHash>(AlgoMD5);
}
if (algo == "SHA1") {
return cm::make_unique<cmCryptoHash>(AlgoSHA1);
}
if (algo == "SHA224") {
return cm::make_unique<cmCryptoHash>(AlgoSHA224);
}
if (algo == "SHA256") {
return cm::make_unique<cmCryptoHash>(AlgoSHA256);
}
if (algo == "SHA384") {
return cm::make_unique<cmCryptoHash>(AlgoSHA384);
}
if (algo == "SHA512") {
return cm::make_unique<cmCryptoHash>(AlgoSHA512);
}
if (algo == "SHA3_224") {
return cm::make_unique<cmCryptoHash>(AlgoSHA3_224);
}
if (algo == "SHA3_256") {
return cm::make_unique<cmCryptoHash>(AlgoSHA3_256);
}
if (algo == "SHA3_384") {
return cm::make_unique<cmCryptoHash>(AlgoSHA3_384);
}
if (algo == "SHA3_512") {
return cm::make_unique<cmCryptoHash>(AlgoSHA3_512);
}
return std::unique_ptr<cmCryptoHash>(nullptr);
}
bool cmCryptoHash::IntFromHexDigit(char input, char& output)
{
if (input >= '0' && input <= '9') {
output = char(input - '0');
return true;
}
if (input >= 'a' && input <= 'f') {
output = char(input - 'a' + 0xA);
return true;
}
if (input >= 'A' && input <= 'F') {
output = char(input - 'A' + 0xA);
return true;
}
return false;
}
std::string cmCryptoHash::ByteHashToString(
const std::vector<unsigned char>& hash)
{
// Map from 4-bit index to hexadecimal representation.
static char const hex[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
std::string res;
res.reserve(hash.size() * 2);
for (unsigned char v : hash) {
res.push_back(hex[v >> 4]);
res.push_back(hex[v & 0xF]);
}
return res;
}
std::vector<unsigned char> cmCryptoHash::ByteHashString(cm::string_view input)
{
this->Initialize();
this->Append(input);
return this->Finalize();
}
std::vector<unsigned char> cmCryptoHash::ByteHashFile(const std::string& file)
{
cmsys::ifstream fin(file.c_str(), std::ios::in | std::ios::binary);
if (fin) {
this->Initialize();
{
// Should be efficient enough on most system:
KWIML_INT_uint64_t buffer[512];
char* buffer_c = reinterpret_cast<char*>(buffer);
unsigned char const* buffer_uc =
reinterpret_cast<unsigned char const*>(buffer);
// This copy loop is very sensitive on certain platforms with
// slightly broken stream libraries (like HPUX). Normally, it is
// incorrect to not check the error condition on the fin.read()
// before using the data, but the fin.gcount() will be zero if an
// error occurred. Therefore, the loop should be safe everywhere.
while (fin) {
fin.read(buffer_c, sizeof(buffer));
if (int gcount = static_cast<int>(fin.gcount())) {
this->Append(buffer_uc, gcount);
}
}
}
if (fin.eof()) {
// Success
return this->Finalize();
}
// Finalize anyway
this->Finalize();
}
// Return without success
return std::vector<unsigned char>();
}
std::string cmCryptoHash::HashString(cm::string_view input)
{
return ByteHashToString(this->ByteHashString(input));
}
std::string cmCryptoHash::HashFile(const std::string& file)
{
return ByteHashToString(this->ByteHashFile(file));
}
void cmCryptoHash::Initialize()
{
rhash_reset(this->CTX);
}
void cmCryptoHash::Append(void const* buf, size_t sz)
{
rhash_update(this->CTX, buf, sz);
}
void cmCryptoHash::Append(cm::string_view input)
{
rhash_update(this->CTX, input.data(), input.size());
}
std::vector<unsigned char> cmCryptoHash::Finalize()
{
std::vector<unsigned char> hash(rhash_get_digest_size(this->Id), 0);
rhash_final(this->CTX, &hash[0]);
return hash;
}
std::string cmCryptoHash::FinalizeHex()
{
return cmCryptoHash::ByteHashToString(this->Finalize());
}
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