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common: update sha256sum to use OpenSSL 3.0 API

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As of OpenSSL 3.0, `SHA256_Init`, `SHA256_Update`, and `SHA256_Final`
are deprectaed in favor of the higher-level `EVP_*` class of functions.
This causes compiler warnings, and sooner or later, will cause build
errors as these functions are excluded from distro headers.

Also add some documentation.
This commit is contained in:
Jeffrey Ryan 2022-05-17 22:40:36 +02:00 committed by selsta
parent 6e60919e6d
commit a66a52d144
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GPG key ID: 2EA0A99A8B07AE5E
2 changed files with 26 additions and 13 deletions
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19
src/common/util.cpp
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@ -85,7 +85,7 @@ using namespace epee;
#include <boost/algorithm/string.hpp> #include <boost/algorithm/string.hpp>
#include <boost/asio.hpp> #include <boost/asio.hpp>
#include <boost/format.hpp> #include <boost/format.hpp>
#include <openssl/sha.h> #include <openssl/evp.h>
#undef MONERO_DEFAULT_LOG_CATEGORY #undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "util" #define MONERO_DEFAULT_LOG_CATEGORY "util"
@ -941,14 +941,7 @@ std::string get_nix_version_display_string()
bool sha256sum(const uint8_t *data, size_t len, crypto::hash &hash) bool sha256sum(const uint8_t *data, size_t len, crypto::hash &hash)
{ {
SHA256_CTX ctx; return EVP_Digest(data, len, (unsigned char*) hash.data, NULL, EVP_sha256(), NULL) != 0;
if (!SHA256_Init(&ctx))
return false;
if (!SHA256_Update(&ctx, data, len))
return false;
if (!SHA256_Final((unsigned char*)hash.data, &ctx))
return false;
return true;
} }
bool sha256sum(const std::string &filename, crypto::hash &hash) bool sha256sum(const std::string &filename, crypto::hash &hash)
@ -961,8 +954,8 @@ std::string get_nix_version_display_string()
if (!f) if (!f)
return false; return false;
std::ifstream::pos_type file_size = f.tellg(); std::ifstream::pos_type file_size = f.tellg();
SHA256_CTX ctx; std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_free)> ctx(EVP_MD_CTX_new(), &EVP_MD_CTX_free);
if (!SHA256_Init(&ctx)) if (!EVP_DigestInit_ex(ctx.get(), EVP_sha256(), nullptr))
return false; return false;
size_t size_left = file_size; size_t size_left = file_size;
f.seekg(0, std::ios::beg); f.seekg(0, std::ios::beg);
@ -973,12 +966,12 @@ std::string get_nix_version_display_string()
f.read(buf, read_size); f.read(buf, read_size);
if (!f || !f.good()) if (!f || !f.good())
return false; return false;
if (!SHA256_Update(&ctx, buf, read_size)) if (!EVP_DigestUpdate(ctx.get(), buf, read_size))
return false; return false;
size_left -= read_size; size_left -= read_size;
} }
f.close(); f.close();
if (!SHA256_Final((unsigned char*)hash.data, &ctx)) if (!EVP_DigestFinal_ex(ctx.get(), (unsigned char*)hash.data, nullptr))
return false; return false;
return true; return true;
} }

20
src/common/util.h
View file

@ -231,7 +231,27 @@ namespace tools
bool is_privacy_preserving_network(const std::string &address); bool is_privacy_preserving_network(const std::string &address);
int vercmp(const char *v0, const char *v1); // returns < 0, 0, > 0, similar to strcmp, but more human friendly than lexical - does not attempt to validate int vercmp(const char *v0, const char *v1); // returns < 0, 0, > 0, similar to strcmp, but more human friendly than lexical - does not attempt to validate
/**
* \brief Creates a SHA-256 digest of a data buffer
*
* \param[in] data pointer to the buffer
* \param[in] len size of the buffer in bytes
* \param[out] hash where message digest will be written to
*
* \returns true if successful, false otherwise
*/
bool sha256sum(const uint8_t *data, size_t len, crypto::hash &hash); bool sha256sum(const uint8_t *data, size_t len, crypto::hash &hash);
/**
* \brief Creates a SHA-256 digest of a file's contents, equivalent to the sha256sum command in Linux
*
* \param[in] filename path to target file
* \param[out] hash where message digest will be written to
*
* \returns true if successful, false if the file can not be opened or there is an OpenSSL failure
*
* \throws ios_base::failure if after the file is successfully opened, an error occurs during reading
*/
bool sha256sum(const std::string &filename, crypto::hash &hash); bool sha256sum(const std::string &filename, crypto::hash &hash);
boost::optional<bool> is_hdd(const char *path); boost::optional<bool> is_hdd(const char *path);