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utils: add some helpers to generate UUIDs

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This commit is contained in:
Steffen Vogel 2020-10-15 12:52:23 +02:00
parent 7e9583187b
commit bf1285a71a
2 changed files with 33 additions and 0 deletions
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8
common/include/villas/utils.hpp
View file

@ -36,6 +36,8 @@
#include <sys/types.h>
#include <openssl/sha.h>
#include <jansson.h>
#include <uuid/uuid.h>
#include <villas/config.h>
#include <villas/log.h>
@ -200,6 +202,12 @@ size_t strlenp(const char *str);
*/
int sha1sum(FILE *f, unsigned char *sha1);
/** Generate an UUID by MD5 hashing the provided string */
void uuid_generate_from_str(uuid_t out, const std::string &data, const std::string &ns = "");
/** Generate an UUID by MD5 hashing the serialized representation of the provided JSON object */
void uuid_generate_from_json(uuid_t out, json_t *json, const std::string &ns = "");
namespace base64 {
using byte = std::uint8_t;

25
common/lib/utils.cpp
View file

@ -1,6 +1,7 @@
/** Utilities.
*
* @author Daniel Krebs <github@daniel-krebs.net>
* @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
* @license GNU General Public License (version 3)
*
@ -38,6 +39,9 @@
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#include <jansson.h>
#include <uuid/uuid.h>
#include <villas/config.h>
#include <villas/utils.hpp>
@ -353,5 +357,26 @@ int sha1sum(FILE *f, unsigned char *sha1)
return 0;
}
void uuid_generate_from_str(uuid_t out, const std::string &data, const std::string &ns)
{
std::stringstream ss;
if (!ns.empty())
ss << ns << "|";
ss << data;
MD5((unsigned char*) ss.str().c_str(), ss.str().size(), (unsigned char *) &out);
}
void uuid_generate_from_json(uuid_t out, json_t *json, const std::string &ns)
{
char *str = json_dumps(json, JSON_COMPACT | JSON_SORT_KEYS);
uuid_generate_from_str(out, str, ns);
free(str);
}
} /* namespace utils */
} /* namespace villas */