apacha

函数大致内容

加密函数算法

实际上是xxtea

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#include <stdio.h>  
#include <stdint.h>  
#define DELTA 0x61C88647
#define MX (((z>>5^y<<2) + (y>>3^z<<4)) ^ ((sum^y) + (key[(p&3)^e] ^ z)))  

void btea(uint32_t* v, int n, uint32_t const key[4])
{
    uint32_t y, z, sum;
    unsigned p, rounds, e;

        rounds = 6 + 52 / n;
        sum = 0x9E3779B9 * (52 / n) - 0x4AB325AA;
        y = v[0];
        do
        {
            e = (sum >> 2) & 3;
            for (p = n - 1; p > 0; p--)
            {
                z = v[p - 1]; //环形加密，加密data[len-1]需要data[0]作为y，data[len-2]作为z
                y = v[p] -= MX;
            }
            z = v[n - 1];
            y = v[0] -= MX;
            sum += DELTA;
        } while (--rounds);
    
}

int main()
{
    unsigned int data[35] = {
    0xE74EB323, 0xB7A72836, 0x59CA6FE2, 0x967CC5C1, 0xE7802674, 0x3D2D54E6, 0x8A9D0356, 0x99DCC39C,
    0x7026D8ED, 0x6A33FDAD, 0xF496550A, 0x5C9C6F9E, 0x1BE5D04C, 0x6723AE17, 0x5270A5C2, 0xAC42130A,
    0x84BE67B2, 0x705CC779, 0x5C513D98, 0xFB36DA2D, 0x22179645, 0x5CE3529D, 0xD189E1FB, 0xE85BD489,
    0x73C8D11F, 0x54B5C196, 0xB67CB490, 0x2117E4CA, 0x9DE3F994, 0x2F5AA1AA, 0xA7E801FD, 0xC30D6EAB,
    0x1BADDC9C, 0x3453B04A, 0x92A406F9
    };
    uint32_t const k[4] = { 1,2,3,4 };
    int n = 35;
    btea(data, n, k);
    for (int i = 0; i <= 34; i++)
    {
        printf("%c", (char)data[i]);
    }
    return 0;
}