/*      $NetBSD: mdXhl.c,v 1.13 2014/09/24 13:18:52 christos Exp $      */

/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <phk@login.dkuug.dk> wrote this file.  As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
 * ----------------------------------------------------------------------------
 *
 * from FreeBSD Id: mdXhl.c,v 1.8 1996/10/25 06:48:12 bde Exp
 */

/*
 * Modified April 29, 1997 by Jason R. Thorpe <thorpej@NetBSD.org>
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#define CONCAT(x,y)     __CONCAT(x,y)
#define MDNAME(x)       CONCAT(MDALGORITHM,x)

#if !defined(_KERNEL) && defined(__weak_alias) && !defined(HAVE_NBTOOL_CONFIG_H)
#define WA(a,b) __weak_alias(a,b)
WA(MDNAME(End),CONCAT(_,MDNAME(End)))
WA(MDNAME(File),CONCAT(_,MDNAME(File)))
WA(MDNAME(Data),CONCAT(_,MDNAME(Data)))
#undef WA
#endif

#include "namespace.h"

#include <sys/types.h>

#include MDINCLUDE
#include <assert.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

char *
MDNAME(End)(MDNAME(_CTX) *ctx, char *buf)
{
        int i;
        unsigned char digest[16];
        static const char hex[]="0123456789abcdef";

        _DIAGASSERT(ctx != 0);

        if (buf == NULL)
                buf = malloc(33);
        if (buf == NULL)
                return (NULL);

        MDNAME(Final)(digest, ctx);

        for (i = 0; i < 16; i++) {
                buf[i+i] = hex[(u_int32_t)digest[i] >> 4];
                buf[i+i+1] = hex[digest[i] & 0x0f];
        }

        buf[i+i] = '\0';
        return (buf);
}

char *
MDNAME(File)(const char *filename, char *buf)
{
        unsigned char buffer[BUFSIZ];
        MDNAME(_CTX) ctx;
        int f, j;
        ssize_t i;

        _DIAGASSERT(filename != 0);
        /* buf may be NULL */

        MDNAME(Init)(&ctx);
        f = open(filename, O_RDONLY | O_CLOEXEC, 0666);
        if (f < 0)
                return NULL;

        while ((i = read(f, buffer, sizeof(buffer))) > 0)
                MDNAME(Update)(&ctx, buffer, (unsigned int)i);

        j = errno;
        close(f);
        errno = j;

        if (i < 0)
                return NULL;

        return (MDNAME(End)(&ctx, buf));
}

char *
MDNAME(Data)(const unsigned char *data, unsigned int len, char *buf)
{
        MDNAME(_CTX) ctx;

        _DIAGASSERT(data != 0);

        MDNAME(Init)(&ctx);
        MDNAME(Update)(&ctx, data, len);
        return (MDNAME(End)(&ctx, buf));
}