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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <string>
#include <openssl/sha.h>
#include <openssl/evp.h>
inline std::string pdns_sha1sum(const std::string& input)
{
unsigned char result[20] = {0};
SHA1(reinterpret_cast<const unsigned char*>(input.c_str()), input.length(), result);
return std::string(result, result + sizeof result);
}
inline std::string pdns_sha256sum(const std::string& input)
{
unsigned char result[32] = {0};
SHA256(reinterpret_cast<const unsigned char*>(input.c_str()), input.length(), result);
return std::string(result, result + sizeof result);
}
inline std::string pdns_sha384sum(const std::string& input)
{
unsigned char result[48] = {0};
SHA384(reinterpret_cast<const unsigned char*>(input.c_str()), input.length(), result);
return std::string(result, result + sizeof result);
}
inline std::string pdns_sha512sum(const std::string& input)
{
unsigned char result[64] = {0};
SHA512(reinterpret_cast<const unsigned char*>(input.c_str()), input.length(), result);
return std::string(result, result + sizeof result);
}
namespace pdns
{
class SHADigest
{
public:
SHADigest() :
SHADigest(256) {}
SHADigest(unsigned int bits) :
#if defined(HAVE_EVP_MD_CTX_NEW) && defined(HAVE_EVP_MD_CTX_FREE)
mdctx(std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_free)>(EVP_MD_CTX_new(), EVP_MD_CTX_free))
#else
mdctx(std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_destroy)>(EVP_MD_CTX_create(), EVP_MD_CTX_destroy))
#endif
{
if (mdctx == nullptr) {
throw std::runtime_error("SHADigest: EVP_MD_CTX_new failed");
}
switch (bits) {
case 256:
md = EVP_sha256();
break;
case 384:
md = EVP_sha384();
break;
case 512:
md = EVP_sha512();
break;
default:
throw std::invalid_argument("SHADigest: unsupported size");
}
if (EVP_DigestInit_ex(mdctx.get(), md, NULL) == 0) {
throw std::runtime_error("SHADigest: init error");
}
}
~SHADigest()
{
// No free of md needed and mdctx is cleaned up by unique_ptr
}
void process(const std::string& msg)
{
if (EVP_DigestUpdate(mdctx.get(), msg.data(), msg.size()) == 0) {
throw std::runtime_error("SHADigest: update error");
}
}
std::string digest()
{
std::string md_value;
md_value.resize(EVP_MD_size(md));
unsigned int md_len;
if (EVP_DigestFinal_ex(mdctx.get(), reinterpret_cast<unsigned char*>(md_value.data()), &md_len) == 0) {
throw std::runtime_error("SHADigest: finalize error");
}
if (md_len != md_value.size()) {
throw std::runtime_error("SHADigest: inconsistent size");
}
return md_value;
}
private:
#if defined(HAVE_EVP_MD_CTX_NEW) && defined(HAVE_EVP_MD_CTX_FREE)
std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_free)> mdctx;
#else
std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_destroy)> mdctx;
#endif
const EVP_MD* md;
};
}
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