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如何实现PHP的TEA算法

Jun 06, 2016 pm 07:56 PM
phpteahowaccomplishSimplealgorithm

算法简单,而且效率高,每次可以操作8个字节的数据,加密解密的KEY为16字节,即包含4个int数据的int型数组,加密轮数应为8的倍数,一般比较常用的轮数为64,32,16,QQ原来就是用TEA16来还原密码的。 TEA算法 核心为: #include stdint.h void encrypt (uint

    算法简单,而且效率高,每次可以操作8个字节的数据,加密解密的KEY为16字节,即包含4个int数据的int型数组,加密轮数应为8的倍数,一般比较常用的轮数为64,32,16,QQ原来就是用TEA16来还原密码的。

    TEA算法

    核心为:

#include

void encrypt (uint32_t* v, uint32_t* k) {
    uint32_t v0=v[0], v1=v[1], sum=0, i;           /* set up */
    uint32_t delta=0x9e3779b9;                     /* a key schedule constant */
    uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
    for (i=0; i         sum += delta;
        v0 += ((v1>5) + k1);
        v1 += ((v0>5) + k3); 
    }                   /* end cycle */
    v[0]=v0; v[1]=v1;
}

void decrypt (uint32_t* v, uint32_t* k) {
    uint32_t v0=v[0], v1=v[1], sum=0xC6EF3720, i;  /* set up */
    uint32_t delta=0x9e3779b9;                     /* a key schedule constant */
    uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
    for (i=0; i        v1 -= ((v0>5) + k3);
        v0 -= ((v1>5) + k1);
        sum -= delta;                                  
    }            /* end cycle */

    v[0]=v0; v[1]=v1;
}

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如何实现PHP的TEA算法

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