Massive constification.

apps/enc.c

diff --git a/apps/enc.c b/apps/enc.c
index c00d520..00cc336 100644
--- a/apps/enc.c
+++ b/apps/enc.c
@@ -97,7 +97,7 @@
 	char *hkey=NULL,*hiv=NULL;
 	int enc=1,printkey=0,i,base64=0;
 	int debug=0,olb64=0;
-	EVP_CIPHER *cipher=NULL,*c;
+	const EVP_CIPHER *cipher=NULL,*c;
 	char *inf=NULL,*outf=NULL;
 	BIO *in=NULL,*out=NULL,*b64=NULL,*benc=NULL,*rbio=NULL,*wbio=NULL;
 #define PROG_NAME_SIZE  16