version5.c File Reference

#include <sys/types.h>
#include <openssl/sha.h>
#include <arpa/inet.h>
#include "class.h"
#include "uuid.h"

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Functions
void	_uuidFormat3or5 (Uuid uuid, unsigned char hash[16], int version)
Uuid	uuidVersion5 (const unsigned char *name, size_t nname, Uuid nsid)

Detailed Description

Author

Georg Hopp

Copyright

Copyright © 2013 Georg Hopp

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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, see http://www.gnu.org/licenses/.

Definition in file version5.c.

Function Documentation

void _uuidFormat3or5	(	Uuid	uuid,
		unsigned char	hash[16],
		int	version
	)

Definition at line 36 of file _format3or5.c.

Referenced by uuidVersion5().

{
    /* convert UUID to local byte order */
    memcpy((uuid->uuid).value, hash, 16);

    (uuid->uuid).elements.time_low = 
        ntohl((uuid->uuid).elements.time_low);
    (uuid->uuid).elements.time_mid = 
        ntohs((uuid->uuid).elements.time_mid);
    (uuid->uuid).elements.time_hi_version =
        ntohs((uuid->uuid).elements.time_hi_version);

    /* put in the variant and version bits */
    (uuid->uuid).elements.time_hi_version  &= 0x0FFF;
    (uuid->uuid).elements.time_hi_version  |= (version << 12);
    (uuid->uuid).elements.clk_seq_hi_res   &= 0x3F;
    (uuid->uuid).elements.clk_seq_hi_res   |= 0x80;
}

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Uuid uuidVersion5	(	const unsigned char *	name,
		size_t	nname,
		Uuid	nsid
	)

Definition at line 39 of file version5.c.

References _uuidFormat3or5(), and clone.

Referenced by main().

{
    SHA_CTX       ctx;
    unsigned char hash[20];
    Uuid          net_nsid = clone(nsid);
    Uuid          uuid     = new(Uuid);

    /*
     * put the namespace id into network byte order.
     */
    (net_nsid->uuid).elements.time_low =
        htonl((net_nsid->uuid).elements.time_low);
    (net_nsid->uuid).elements.time_mid =
        htons((net_nsid->uuid).elements.time_mid);
    (net_nsid->uuid).elements.time_hi_version =
        htons((net_nsid->uuid).elements.time_hi_version);

    /*
     * generate the MD5
     */
    SHA1_Init(&ctx);
    SHA1_Update(&ctx, (net_nsid->uuid).value, 16);
    SHA1_Update(&ctx, name, nname);
    SHA1_Final(hash, &ctx);

    delete(net_nsid);

    _uuidFormat3or5(uuid, hash, 5);

    return uuid;
}

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