调用方法（加密》解密》加密）：unsigned char key1[] = "12345678"; unsigned char key2[] = "abcdefgh"; unsigned char key3[] = "~!@#$%^&"; //如果只需要两组密钥，则本组密钥可以和密钥1一样。 unsigned char en_data[] = "龙的子孙"; unsigned char en_out_put[8]; //3DES 加密 des(en_data, key1, en_out_put, DES_ENCRYPT); des(en_out_put, key2, en_data, DES_DECRYPT); des(en_data, key3, en_out_put, DES_ENCRYPT);