#include "netsec_des.h"

void netsec_des_crypt(int mode, const_DES_cblock *input, DES_cblock *output, char *key) {
    const_DES_cblock des_key;
    DES_key_schedule schedule;

    int des_mode = 0;

	switch (mode) {
		case NS_DES_ENCRYPT:
        	des_mode = DES_ENCRYPT;
			break;
    	case NS_DES_DECRYPT:
        	des_mode = DES_DECRYPT;
			break;
		default:
        	fprintf(stderr, "invalid mode parameter!");
        	exit(1);
    }

    DES_string_to_key(key, &des_key);
    switch(DES_set_key_checked(&des_key, &schedule)) {
        case -1:
            perror("Bad parity\n");
            exit(1);
        case -2:
            perror("Key is weak\n");
            exit(1);
    }
    DES_ecb_encrypt(input, output, &schedule, des_mode);
}