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util: add a SHA256 function

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moneromooo-monero 2017-02-20 20:46:50 +00:00
parent 4bf7849297
commit 216f062eb8
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3 changed files with 37 additions and 1 deletions
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35
src/common/util.cpp
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@ -31,6 +31,7 @@
#include <cstdio>
#include "include_base_utils.h"
#include "file_io_utils.h"
using namespace epee;
#include "util.h"
@ -46,7 +47,7 @@ using namespace epee;
#endif
#include <boost/filesystem.hpp>
#include <boost/asio.hpp>
#include <openssl/sha.h>
namespace tools
{
@ -585,4 +586,36 @@ std::string get_nix_version_display_string()
}
return 0;
}
bool sha256sum(const std::string &filename, crypto::hash &hash)
{
if (!epee::file_io_utils::is_file_exist(filename))
return false;
std::ifstream f;
f.exceptions(std::ifstream::failbit | std::ifstream::badbit);
f.open(filename, std::ios_base::binary | std::ios_base::in | std::ios::ate);
if (!f)
return false;
std::ifstream::pos_type file_size = f.tellg();
SHA256_CTX ctx;
if (!SHA256_Init(&ctx))
return false;
size_t size_left = file_size;
f.seekg(0, std::ios::beg);
while (size_left)
{
char buf[4096];
std::ifstream::pos_type read_size = size_left > sizeof(buf) ? sizeof(buf) : size_left;
f.read(buf, read_size);
if (!f || !f.good())
return false;
if (!SHA256_Update(&ctx, buf, read_size))
return false;
size_left -= read_size;
}
f.close();
if (!SHA256_Final((unsigned char*)hash.data, &ctx))
return false;
return true;
}
}