/*$Id: tagmsg.c,v 1.3 1999/10/12 23:38:36 lindberg Exp $*/
/*$Name: ezmlm-idx-040 $*/
#include "stralloc.h"
#include "scan.h"
#include "fmt.h"
#include "strerr.h"
#include "cookie.h"
#include "slurp.h"
#include "errtxt.h"
#include "subscribe.h"
#include "makehash.h"

static stralloc line = {0};
static stralloc key = {0};
static char hash[COOKIE];
static char strnum[FMT_ULONG];	/* message number as sz */

static void die_nomem(fatal)
char *fatal;
{
  strerr_die2x(100,fatal,ERR_NOMEM);
}

void tagmsg(dir,msgnum,seed,action,hashout,bodysize,chunk,fatal)
/* This routine creates a cookie from num,seed and the */
/* list key and returns that cookie in hashout. The use of sender/num and */
/* first char of action is used to make cookie differ between messages,   */
/* the key is the secret list key. */

char *dir;			/* db base dir */
unsigned long msgnum;		/* number of this message */
char *seed;			/* seed. NULL ok, but less entropy */
char *action;			/* to make it certain the cookie differs from*/
				/* one used for a digest */
char *hashout;			/* calculated hash goes here */
unsigned long bodysize;
unsigned long chunk;
char *fatal;
{
  unsigned int i;

  strnum[fmt_ulong(strnum,msgnum)] = '\0';	/* message nr ->string*/

    switch(slurp("key",&key,32)) {
      case -1:
	strerr_die3sys(111,fatal,ERR_READ,"key: ");
      case 0:
	strerr_die3x(100,fatal,"key",ERR_NOEXIST);
    }
    cookie(hash,key.s,key.len,strnum,seed,action);
    for (i = 0; i < COOKIE; i++)
      hashout[i] = hash[i];

    return;
}