Summary of PHP encryption algorithm

<?php

#加密算法

Header (' content-type:text/html;charset=utf-8; ');

$password = ' Hugehugehuge ';

$pwd = ' Hugehuge ';

MD5 encryption, one-way encryption algorithm, two parameters, 1 must write, to encrypt the string,

2 The second parameter is the bool value, which is true, and the MD5 Digest is to be returned in the original binary format of 16 bytes in length. Returns a 32-bit string

Echo ' MD5 default call:<br> ';

echo MD5 ($password);

echo "<BR>";

Echo ' MD5 configuration second parameter call:<br> ';

echo MD5 ($password, true);

CRYP, one-way encryption algorithm, two parameters, 1. A parameter to encrypt the plaintext, it also uses only the beginning of the clear text 8 characters

2. Encrypted interference string, the default is two bits, if not written, the system randomly generated two characters, also known as the salt value or the key.

Echo ' <br> ';

Echo '

echo "Crypt encryption algorithm <BR>";

Echo Crypt ($password);

Echo ' <br> ';

Echo Crypt ($password, ' Hu ');

if (crypt_std_des) {//cryptdes standard algorithm

echo ' <br> standard algorithm, only takes two-bit string as interference string ';

Echo ' <br> ';

Echo Crypt ($password, ' This is a test ');

Echo ' <br>pwd: ';

Echo Crypt ($pwd, ' This is a test ');

Echo ' See if two results are the same <br> ';

}

if (CRYPT_MD5) {//MD5 encryption

Echo ' <BR>MD5 encryption algorithm, the second parameter begins with $1$, ends with $12 bits as interference string including $1$ ';

echo "<br>";

Echo Crypt ($password, ' $1$hellohellohello$ ');

echo "<br>pwd:";

Echo Crypt ($pwd, ' $1$hellohellohello$ ');

}

SHA1 encryption algorithm, returns a 40-bit length string, one-way encryption algorithm

Echo '

Echo SHA1 ($password);

echo "<BR>";

Echo ' MD5 configuration second parameter call:<br> ';

Echo SHA1 ($password, true);

URL encryption and decryption

UrlEncode, all non-alphanumeric strings passed in the string except-_.

is replaced with a percent sign (%) followed by a two-bit 16-digit number, and the space is encoded as a plus (+)

Echo '

$url 1= ' This is a URL ';

Echo UrlEncode ($url 1);

Echo ' <br> ';

$url 2= ' www.qdweb.com?username=2+3%4 huge &king # or \1=1 ';

Echo UrlEncode ($url 2);

/*

Common conversions

？ Become%3f

= Become%3d

Space becomes +

% into%25

& Into%26

\ become%5c

+ Become%2b

*/

One use of Echo ' <br>urldecode: Merging parameter,<br> ';

if (!empty ($_get)) {

Print_r ($_get);

}

Echo ' <br> ';

$url 3= ' http://www.qdweb.com/jiami.php?username=huge&age=24 ';

Echo ' <a href= '. $url 3. ' " >urldecode merging Parameters </a> ';

$baidu = ' http://www.baidu.com/s?wd=%E6%85%95%E8%AF%BE%E7%BD%91%20immoc&ie=utf-8&tn=baiduhome_pg&f=8 &rsv_bp=1&rsv_spt=1&rsv_sug3=6&rsv_sug4=109&rsv_sug1=3&rsv_n=2&inputt=8408&rsv _sug=1&bs=immoc%20%20%e6%85%95%e8%af%be%e7%bd%91 ';

Echo ' <br> ';

Echo ' Rawurlencode: ';

Encode by RFC1738, convert space to 20%, other ibid.

Echo Rawurlencode ($url 2);

#解码

$url = ' This is a test! ';

$enurl =urlencode ($url);

Echo ' <br>urlencode encoded: '. $enurl;

$deurl =urldecode ($enurl);

Echo ' <br>urlencode decoded: '. $deurl;

#解码

$url = ' This is a test! ';

$enurl =rawurlencode ($url);

Echo ' <br>rawurlencode encoded: '. $enurl;

$deurl =rawurldecode ($enurl);

Echo ' <br>rawurlencode after anti-coding: '. $deurl;

UrlDecode can also decode 20% into a space

$deurl =urldecode ($enurl);

Echo ' <br>urlencode decodes the Rawurlencode encoded string: '. $deurl;

Base64_encode (), encoding the passed-in string using base64

Typically used in mail, to encode binary images

$data = ' Tiger brother is a God!! ‘;

Echo '

$endata =base64_encode ($data);

Echo $endata;

Base64_decode (Data,bool Strict), decoding data encoded with MIME base64

Returns false if the input data exceeds the Base64 alphabet

Echo ' <br>base64_decode after decryption: ';

echo Base64_decode ($endata);

?>

This article is from "Tiger Brother's Blog" blog, please be sure to keep this source http://7613577.blog.51cto.com/7603577/1531691