8286395: Address possibly lossy conversions in java.security.jgss

Reviewed-by: chegar

src/java.security.jgss/share/classes/sun/security/krb5/internal/crypto/Des.java

@@ -272,7 +272,7 @@ public final class Des {
         key = set_parity(key);
         if (bad_key(key)) {
             byte [] temp = long2octet(key);
-            temp[7] ^= 0xf0;
+            temp[7] ^= (byte) 0xf0;
             key = octet2long(temp);
         }
 
@@ -280,7 +280,7 @@ public final class Des {
         key = octet2long(set_parity(newkey));
         if (bad_key(key)) {
             byte [] temp = long2octet(key);
-            temp[7] ^= 0xf0;
+            temp[7] ^= (byte) 0xf0;
             key = octet2long(temp);
         }
 

src/java.security.jgss/share/classes/sun/security/krb5/internal/crypto/dk/Des3DkCrypto.java

@@ -157,7 +157,7 @@ public class Des3DkCrypto extends DkCrypto {
             }
             ++posn;
             if (bit != 0) {
-                last |= (bit<<posn);
+                last |= (byte) (bit<<posn);
             }
         }