Don't use reserved name "_encrypt" for parameters;

instead I've picked "enc", because that's what's in the prototypes.
("_encrypt" is reserved only as an external name, but still
using it in an application doesn't look like good style to me --
and it certainly isn't if the point is just avoiding shadowing,
which is apparently why the previous name "encrypt" was changed.)

crypto/cast/c_cfb64.c

@@ -66,7 +66,7 @@
 
 void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out,
 			long length, CAST_KEY *schedule, unsigned char *ivec,
-			int *num, int _encrypt)
+			int *num, int enc)
 	{
 	register CAST_LONG v0,v1,t;
 	register int n= *num;
@@ -75,7 +75,7 @@ void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out,
 	unsigned char *iv,c,cc;
 
 	iv=ivec;
-	if (_encrypt)
+	if (enc)
 		{
 		while (l--)
 			{

crypto/cast/c_ecb.c

@@ -63,13 +63,13 @@
 char *CAST_version="CAST" OPENSSL_VERSION_PTEXT;
 
 void CAST_ecb_encrypt(const unsigned char *in, unsigned char *out,
-		      CAST_KEY *ks, int _encrypt)
+		      CAST_KEY *ks, int enc)
 	{
 	CAST_LONG l,d[2];
 
 	n2l(in,l); d[0]=l;
 	n2l(in,l); d[1]=l;
-	if (_encrypt)
+	if (enc)
 		CAST_encrypt(d,ks);
 	else
 		CAST_decrypt(d,ks);

crypto/cast/c_enc.c

@@ -124,14 +124,14 @@ void CAST_decrypt(CAST_LONG *data, CAST_KEY *key)
 	}
 
 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
-	     CAST_KEY *ks, unsigned char *iv, int _encrypt)
+	     CAST_KEY *ks, unsigned char *iv, int enc)
 	{
 	register CAST_LONG tin0,tin1;
 	register CAST_LONG tout0,tout1,xor0,xor1;
 	register long l=length;
 	CAST_LONG tin[2];
 
-	if (_encrypt)
+	if (enc)
 		{
 		n2l(iv,tout0);
 		n2l(iv,tout1);