From 3c7b86229f7bd2600d74db14b1fe5b3896be3875 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaroslav=20=C5=A0karvada?= <jskarvad@redhat.com>
Date: Fri, 6 Apr 2018 14:27:18 +0200
Subject: [PATCH] pppd: Use openssl for the DES instead of the libcrypt / glibc
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It seems the latest glibc (in Fedora glibc-2.27.9000-12.fc29) dropped
libcrypt.  The libxcrypt standalone package can be used instead, but
it dropped the old setkey/encrypt API which ppp uses for DES.  There
is support for using openssl in pppcrypt.c, but it contains typos
preventing it from compiling and seems to be written for an ancient
openssl version.

This updates the code to use current openssl.

[paulus@ozlabs.org - wrote the commit description, fixed comment in
 Makefile.linux.]

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from:
https://github.com/paulusmack/ppp/commit/3c7b86229f7bd2600d74db14b1fe5b3896be3875]
---
 pppd/Makefile.linux |  7 ++++---
 pppd/pppcrypt.c     | 18 +++++++++---------
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/pppd/Makefile.linux b/pppd/Makefile.linux
index 36d2b036..8d5ce99d 100644
--- a/pppd/Makefile.linux
+++ b/pppd/Makefile.linux
@@ -35,10 +35,10 @@ endif
 COPTS = -O2 -pipe -Wall -g
 LIBS =
 
-# Uncomment the next 2 lines to include support for Microsoft's
+# Uncomment the next line to include support for Microsoft's
 # MS-CHAP authentication protocol.  Also, edit plugins/radius/Makefile.linux.
 CHAPMS=y
-USE_CRYPT=y
+#USE_CRYPT=y
 # Don't use MSLANMAN unless you really know what you're doing.
 #MSLANMAN=y
 # Uncomment the next line to include support for MPPE.  CHAPMS (above) must
@@ -137,7 +137,8 @@ endif
 
 ifdef NEEDDES
 ifndef USE_CRYPT
-LIBS     += -ldes $(LIBS)
+CFLAGS   += -I/usr/include/openssl
+LIBS     += -lcrypto
 else
 CFLAGS   += -DUSE_CRYPT=1
 endif
diff --git a/pppd/pppcrypt.c b/pppd/pppcrypt.c
index 8b85b132..6b35375e 100644
--- a/pppd/pppcrypt.c
+++ b/pppd/pppcrypt.c
@@ -64,7 +64,7 @@ u_char *des_key;	/* OUT 64 bit DES key with parity bits added */
 	des_key[7] = Get7Bits(key, 49);
 
 #ifndef USE_CRYPT
-	des_set_odd_parity((des_cblock *)des_key);
+	DES_set_odd_parity((DES_cblock *)des_key);
 #endif
 }
 
@@ -158,25 +158,25 @@ u_char *clear;	/* OUT 8 octets */
 }
 
 #else /* USE_CRYPT */
-static des_key_schedule	key_schedule;
+static DES_key_schedule	key_schedule;
 
 bool
 DesSetkey(key)
 u_char *key;
 {
-	des_cblock des_key;
+	DES_cblock des_key;
 	MakeKey(key, des_key);
-	des_set_key(&des_key, key_schedule);
+	DES_set_key(&des_key, &key_schedule);
 	return (1);
 }
 
 bool
-DesEncrypt(clear, key, cipher)
+DesEncrypt(clear, cipher)
 u_char *clear;	/* IN  8 octets */
 u_char *cipher;	/* OUT 8 octets */
 {
-	des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher,
-	    key_schedule, 1);
+	DES_ecb_encrypt((DES_cblock *)clear, (DES_cblock *)cipher,
+	    &key_schedule, 1);
 	return (1);
 }
 
@@ -185,8 +185,8 @@ DesDecrypt(cipher, clear)
 u_char *cipher;	/* IN  8 octets */
 u_char *clear;	/* OUT 8 octets */
 {
-	des_ecb_encrypt((des_cblock *)cipher, (des_cblock *)clear,
-	    key_schedule, 0);
+	DES_ecb_encrypt((DES_cblock *)cipher, (DES_cblock *)clear,
+	    &key_schedule, 0);
 	return (1);
 }