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[exim.git] / src / src / crypt16.c

diff --git a/src/src/crypt16.c b/src/src/crypt16.c
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+/* $Cambridge: exim/src/src/crypt16.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
+
+/*
+ * Copyright (c) 2000-2002
+ *   Chris Adams <cmadams@iruntheinter.net>
+ *   written for HiWAAY Internet Services
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ * USA
+ */
+
+/*
+ * Adapted for Exim by Tamas TEVESZ <ice@extreme.hu>
+ * Further adapted by Philip Hazel to cut out this function for operating
+ *   systems that have a built-in version.
+ */
+
+/* The OS has a built-in crypt16(). Some compilers don't like compiling empty
+modules, so keep them happy with a dummy when skipping the rest. */
+
+#include "config.h"
+
+#ifdef HAVE_CRYPT16
+static void dummy(int x) { dummy(x-1); }
+#else
+
+/* The OS doesn't have a built-in crypt16(). Compile this one. */
+
+#include <unistd.h>
+#include <string.h>
+#include "os.h"
+
+#ifdef CRYPT_H
+#include <crypt.h>
+#endif
+
+char *crypt16(char *key, char *salt)
+{
+       static char res[25];
+       static char s2[3];
+       char *p;
+
+       /* Clear the string of any previous data */
+       memset (res, 0, sizeof (res));
+
+       /* crypt the first part */
+       p = crypt (key, salt);
+       strncpy (res, p, 13);
+
+       if (strlen (key) > 8)
+       {
+               /* crypt the rest
+                * the first two characters of the first block (not counting
+                * the salt) make up the new salt */
+               strncpy (s2, &(res[2]), 2);
+               p = crypt (&(key[8]), s2);
+               strncpy (&(res[13]), &(p[2]), 11);
+               memset (s2, 0, sizeof (s2));
+       }
+
+       return (res);
+}
+#endif
+
+/* End of crypt16.c */