Compile a php application to implement Digest Authentication

This article provides a detailed analysis of how to compile a php application to implement Digest Authentication. For more information, see basic identity authentication, you can also use the PHP web page to process HTTP request header fields to match Digest Authentication information. For example, the following code uses the header () function to require the client to use Digest for verification. It adds the WWW-Authenticate field to the HTTP message header:
Header ('www-Authenticate: Digest Realm = "MyRealm", nonce = "47alf7cf25ce7", algorithm = MD5, qop = "auth "');
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The following code describes a web page that uses Digest Authentication (first cancel the Apache authentication configuration ).

The code is as follows:

$ Realm = "MyRealm ";
// If no authentication information is provided, the sending header requires the browser to use Digest Authentication.
If (! Isset ($ _ SERVER ['php _ AUTH_DIGEST ']) {
Header ("WWW-Authenticate: Digest Realm =/" $ realm/", nonce = /"". uniqid (). "/", algorithm = MD5, qop =/"auth /"");
Header ("HTTP/1.0 401 Unauthorization Required ");
Echo "incorrect account/password! ";
Exit;
} Else {
// Use the http_digest_parse function to parse the verification information
$ Data = http_digest_parse ($ _ SERVER ["PHP_AUTH_DIGEST"]);
If (! $ Data ){
Header ("HTTP/1.0 401 Unauthorization Required ");
Echo "incorrect account/password! ";
Exit;
} Else {
// Construct a response value based on the HTTP protocol
$ A1 = md5 ('admin: '. $ realm.': password ');
$ A2 = md5 ($ _ SERVER ['request _ method']. ':'. $ data ['uris ']);
$ Valid_response =
Md5 ($ A1 .':'. $ data ['nonce ']. ':'. $ data ['NC ']. ':'. $ data ['cnonce ']. ':'. $ data ['qop ']. ':'. $ A2 );}
// Compare the self-built response value with the response value constructed and sent by the browser. if the value is the same, the user name and password are entered correctly.
If ($ data ['response'] = $ valid_response ){
Echo "verified! ";
} Else {
Header ("HTTP/1.0 401 Unauthorization Required ");
Echo ("incorrect account/password! ");
Exit;
}
}
Function http_digest_parse ($ digest_str ){
$ Needed_parts = array ('nonce '=> 1, 'NC' => 1, 'cnonce '=> 1, 'qop' => 1, 'username' => 1, 'URL' => 1, 'response' => 1 );
// Use a regular expression to parse the content of the Authorization header
Preg_match_all ('@ (/w +) = ([/' "]?) ([A-zA-Z0-9 =. // _-] +)/2 @ ', $ digest_str, $ result, PREG_SET_ORDER );
// Fill the result in the $ data array and return
$ Data = array ();
Foreach ($ result as $ m ){
$ Data [$ m [1] = $ m [3];
Unset ($ needed_parts [$ m [1]);
}
Return $ needed_parts? False: $ data;
}
?>