* pppcrypt.c - PPP/DES linkage for MS-CHAP and EAP SRP-SHA1
*
* Extracted from chap_ms.c by James Carlson.
+ * Updated to better reflect RFC2759 by Eivind Naess
*
- * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
- * http://www.strataware.com/
+ * Copyright (c) 2022 Eivind Naess. All rights reserved.
+ * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
*
- * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
*
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by Eric Rosenquist. The name of the author may not be used to
- * endorse or promote products derived from this software without
- * specific prior written permission.
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
*
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
+#ifndef PPP_PPPCRYPT_H
+#define PPP_PPPCRYPT_H
-#ifndef PPPCRYPT_H
-#define PPPCRYPT_H
-
-#ifdef HAVE_CRYPT_H
-#include <crypt.h>
-#endif
+#include "pppdconf.h"
-#ifndef USE_CRYPT
-#include <des.h>
-#endif
+/**
+ * This is the DES encrypt functions as described by RFC2759.
+ *
+ * Parameters:
+ * unsigned char *clear:
+ * A 8 byte input array to be encrypted
+ *
+ * unsigned char *key:
+ * A raw 7-byte array to be expanded to 8 with odd-parity
+ *
+ * unsigned char *cipher:
+ * A 8 byte outut array providing space for the output data
+ *
+ * DesEncrypt returns 1 on success
+ */
+int DesEncrypt(unsigned char *clear, unsigned char *key,
+ unsigned char *cipher);
-extern bool DesSetkey __P((u_char *));
-extern bool DesEncrypt __P((u_char *, u_char *));
-extern bool DesDecrypt __P((u_char *, u_char *));
+/**
+ * This is the DES decrypt functions as described by RFC2759.
+ *
+ * Parameters:
+ * unsigned char *cipher:
+ * A 8 byte input array to be decrypted
+ *
+ * unsigned char *key:
+ * A raw 7-byte array to be expanded to a 8-byte key with odd-parity
+ *
+ * unsigned char *clear:
+ * A 8 byte output array providing space for the output data
+ *
+ * DesDecrypt returns 1 on success
+ */
+int DesDecrypt(unsigned char *cipher, unsigned char *key,
+ unsigned char *clear);
-#endif /* PPPCRYPT_H */
+#endif /* PPP_PPPCRYPT_H */