private byte[] key=null; private byte[][] ikey=null; private byte[] L0=null,R0=null; private byte[] Ln=null,Rn=null;代码的意思
时间: 2023-12-12 18:02:28 浏览: 23
这是一个Java类中的字段声明。其中:
- `key` 是一个字节数组,用于存储加密算法的密钥。
- `ikey` 是一个二维字节数组,用于存储加密算法的轮密钥。
- `L0` 和 `R0` 是两个字节数组,用于存储加密算法的明文分组的左半部分和右半部分(初始值)。
- `Ln` 和 `Rn` 是两个字节数组,用于存储加密算法的明文分组的左半部分和右半部分(迭代过程中的值)。
相关问题
private byte[] XOR(byte[] in,byte[] ikey) { byte[] result=new byte[in.length]; for(int i=0;i<in.length;i++) result[i]=(byte) (in[i]^ikey[i]); return result; }
这段代码定义了一个名为`XOR`的函数,它接受两个字节数组类型的参数`in`和`ikey`,并返回一个字节数组类型的结果。
具体来说,这个函数的作用是将输入的两个字节数组`in`和`ikey`进行按位异或运算,然后将结果存储在一个新的字节数组`result`中,并返回该字节数组。按位异或运算的规则是,对于每一位,如果两个操作数的该位不同,则结果为1,否则为0。
在这个函数中,使用了一个for循环,对每个字节进行了按位异或运算,并将结果存储在了对应位置的`result`中。最后将`result`数组作为函数的返回值,返回给调用方。
将下述代码转化为C语言代码 public class DES_6R { private byte[] key=null; private byte[][] ikey=null; private byte[] L0=null,R0=null; private byte[] Ln=null,Rn=null; private static byte[][] S= {{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}, {15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}, {10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}, {7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}, {2,12,4,1,7,10,11,6,5,8,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,13,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}, {12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}, {4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}, {13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}};
以下是将Java代码转化为C语言代码的结果:
```c
#include <stdio.h>
unsigned char S[8][16] = {
{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13},
{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
{0, 14, 9, 6, 11, 3, 15, 5, 1, 13, 12, 7, 10, 4, 2, 8},
{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1}
};
int main() {
unsigned char key[8] = {0};
unsigned char ikey[8][6] = {0};
unsigned char L0[4] = {0}, R0[4] = {0};
unsigned char Ln[4] = {0}, Rn[4] = {0};
// TODO: 添加代码逻辑
return 0;
}
```
需要注意的是,由于C语言不支持在定义变量时直接进行初始化,所以需要将初始化代码放到 `main` 函数中。另外,Java中的 `byte` 类型对应的是 C 语言中的 `unsigned char` 类型。