re-write the handling of crypto libraries. try to use the one of

openssl's libcrypto or krb4's libdes that has all the required
functionality (md4, md5, sha1, des, rc4).  if there is no such
library, the included lib/des is built.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@10519 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/Makefile.am

@@ -2,7 +2,7 @@
 
 include $(top_srcdir)/Makefile.am.common
 
-INCLUDES += $(INCLUDE_krb4)
+INCLUDES += $(INCLUDE_krb4) $(INCLUDE_des)
 
 bin_PROGRAMS = verify_krb5_conf
 

lib/krb5/crypto.c

@@ -2655,7 +2655,7 @@ krb5_decrypt_EncryptedData(krb5_context context,
  *                                                          *
  ************************************************************/
 
-#ifdef HAVE_OPENSSL_DES_H
+#ifdef HAVE_OPENSSL
 #include <openssl/rand.h>
 
 /* From openssl/crypto/rand/rand_lcl.h */

lib/krb5/krb5_locl.h

@@ -109,29 +109,17 @@ struct sockaddr_dl;
 #include <parse_time.h>
 #include <base64.h>
 
-#ifdef HAVE_OPENSSL_DES_H
+#ifdef HAVE_OPENSSL
 #include <openssl/des.h>
-#else
-#include <des.h>
-#endif
-#ifdef HAVE_OPENSSL_MD4_H
 #include <openssl/md4.h>
-#else
-#include <md4.h>
-#endif
-#ifdef HAVE_OPENSSL_MD5_H
 #include <openssl/md5.h>
-#else
-#include <md5.h>
-#endif
-#ifdef HAVE_OPENSSL_SHA_H
 #include <openssl/sha.h>
-#else
-#include <sha.h>
-#endif
-#ifdef HAVE_OPENSSL_RC4_H
 #include <openssl/rc4.h>
 #else
+#include <des.h>
+#include <md4.h>
+#include <md5.h>
+#include <sha.h>
 #include <rc4.h>
 #endif