des11.c

DES code in C/C++ ....there are some errors to rectify can anyone help??

#define EN0   0      /* MODE == encrypt */
#define DE1   1      /* MODE == decrypt */
typedef struct {        unsigned long ek[32];
        unsigned long dk[32];
} des_ctx;
extern void deskey(unsigned char *, short);
/*                  hexkey[8]     MODE
 * Sets the internal key register according to the hexadecimal
 * key contained in the 8 bytes of hexkey, according to the DES,
 * for encryption or decryption according to MODE.
 */
extern void usekey(unsigned long *);
/*                cookedkey[32]
 * Loads the internal key register with the data in cookedkey.
 */
extern void cpkey(unsigned long *);
/*               cookedkey[32]
 * Copies the contents of the internal key register into the storage
 * located at &ampcookedkey[0].
 */
extern void des(unsigned char *, unsigned char *);
/*                from[8]         to[8]
 * Encrypts/Decrypts (according to the key currently loaded in the
 * internal key register) one block of eight bytes at address 慺rom