rc4加密算法c++文件流
时间: 2023-11-03 20:53:41 浏览: 66
你好!关于RC4加密算法的C语言实现,下面是一个示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
void swap(unsigned char *a, unsigned char *b) {
unsigned char temp = *a;
*a = *b;
*b = temp;
}
void rc4(unsigned char *key, unsigned char *data, int data_length) {
unsigned char S[256];
int i, j = 0;
// 初始化S盒
for (i = 0; i < 256; i++) {
S[i] = i;
}
// 根据密钥打乱S盒
for (i = 0; i < 256; i++) {
j = (j + S[i] + key[i % strlen(key)]) % 256;
swap(&S[i], &S[j]);
}
// 加密/解密数据
i = 0;
j = 0;
for (int k = 0; k < data_length; k++) {
i = (i + 1) % 256;
j = (j + S[i]) % 256;
swap(&S[i], &S[j]);
int t = (S[i] + S[j]) % 256;
data[k] ^= S[t];
}
}
int main() {
unsigned char key[] = "YOUR_KEY";
FILE *input_file = fopen("input.txt", "rb");
FILE *output_file = fopen("output.txt", "wb");
if (input_file == NULL || output_file == NULL) {
printf("文件打开失败!\n");
return 1;
}
fseek(input_file, 0, SEEK_END);
int file_size = ftell(input_file);
fseek(input_file, 0, SEEK_SET);
unsigned char *data = (unsigned char *)malloc(file_size);
fread(data, 1, file_size, input_file);
rc4(key, data, file_size);
fwrite(data, 1, file_size, output_file);
free(data);
fclose(input_file);
fclose(output_file);
return 0;
}
```
请替换`YOUR_KEY`为你自己的密钥,并将需要加密/解密的数据放置在名为`input.txt`的文件中。加密/解密后的结果将保存在`output.txt`文件中。
希望这能帮到你!如果有任何问题,请随时提问。