RC4加密解密

调用RC4函数时，会修改密钥。因此需要两组密钥，一组用来加密，一组用来解密。

#include <openssl/rc4.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static unsigned char g_rc4key[16] =
{
      0x2c, 0xb6, 0xa1, 0xe7, 0xe1, 0x0c, 0x50, 0x02,
        0xa5, 0xde, 0xae, 0x7f, 0xe6, 0x05, 0xbd, 0x90,
};

int main()
{
    unsigned char buffer[10];
    unsigned char buffer1[10];
    RC4_KEY m_rc4SendKey, decryKey;
    char str[10] = "123456789";
    int len = 10;

    memset(buffer, 0, 10);
    memset(buffer1, 0, 10);
    RC4_set_key(&m_rc4SendKey, sizeof(g_rc4key), g_rc4key);
    RC4_set_key(&decryKey, sizeof(g_rc4key), g_rc4key);

    RC4(&m_rc4SendKey, len, str, buffer);
    printf("org: %sn", str);

    RC4(&decryKey, len, buffer, buffer1);
    printf("no_cry: %sn", buffer1);

    return 0;
}