有很多脚本语言里面没有 都是 没有 unsinged int 的，如 PHP。位运算 一般来说 int 和 unsinged int 没有什么差别，除了右移操作，在int 中是补1 在 unsinged int 中是补0，我想了好久，终于想到了一个比较妙的方法，只是，这个方法，右移的次数至少大于1。一般来说，0右移 没有什么意义。
(($a >> 1) & 0x7fffffff) >> ($n -1) 这里$n 是右移的次数。 $n >= 1
比如，实现md5加密，一般来说要用到下面的函数，在PHP中可以这样实现：
function RotateLeft($a, $n)
{
return ($a << $n) | ((($a >> 1) & 0x7fffffff) >> (31 – $n)); 注意运算符的优先级
}
{
return ($a << $n) | ((($a >> 1) & 0x7fffffff) >> (31 – $n)); 注意运算符的优先级
}
对加密解密比较感兴趣的人，应该遇到过和我一样的问题，不知道有没有谁有更好的方法。
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波比源码 » 用int类型实现类型unsinged int的右移操作
波比源码 » 用int类型实现类型unsinged int的右移操作
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