测试字符串在PHP中是否为sha1 [英] Testing if string is sha1 in PHP

问题描述

我正计划将密码存储为sha1，因此我需要一种方法来验证它是否在我的网站的另一点.我打算使用preg_match，但不知道如何制作正则表达式模式.有人可以帮我一个忙吗?

I'm planning on storing the passwords as a sha1, so I need a way to validate that it is a sha1 at another point in my website. I was planning on using preg_match, but I do not know how to make regex patterns. Could someone help me out with one?

谢谢

我不是要看两个哈希是否匹配.

I am not trying to see if two hashes match.

推荐答案

实际上，您可以使用 preg_match() 确保它是一个40个字符的十六进制字符串，如下所示:

Actually, you can use preg_match() to make sure it's a 40 characters hexadecimal string as such:

function is_sha1($str) {
    return (bool) preg_match('/^[0-9a-f]{40}$/i', $str);
}

解释模式:

/        Opening Delimiter
^        Start Of String Anchor
[0-9a-f] Any of the following characters: 0123456789abcdef
{40}     Repeated 40 times
$        End Of String Anchor
/        Closing Delimiter
i        Modifier: Case-Insensitive Search

/        Opening Delimiter
^        Start Of String Anchor
[0-9a-f] Any of the following characters: 0123456789abcdef
{40}     Repeated 40 times
$        End Of String Anchor
/        Closing Delimiter
i        Modifier: Case-Insensitive Search

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如果您要确保 sha1() 哈希与用户提供者的密码匹配，您只需像这样重新哈希:

---

If you are trying to make sure that the sha1() hash matches the password the user provider, you simply rehash like this:

if($db_hash == sha1($user_provided_pass))
   echo "Password is correct!";

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