Beispiel
Berechne den SHA-1 - Hash der Textdatei "test.txt" :
<?php
$filename = "test.txt";
$sha1file = sha1_file($filename);
echo $sha1file;
?>Der Ausgang des Code oben wird sein:
aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
Definition und Verwendung
Die sha1_file() Funktion berechnet die SHA-1 - Hash einer Datei.
Die sha1_file() Funktion verwendet die US Secure Hash Algorithm 1.
Von RFC 3174 - der US Secure Hash Algorithm 1: "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." - "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." - "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." die "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." - "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." , "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." - "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." , der "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature." , "SHA-1 produces a 160-bit output called a message digest. The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message. Signing the message digest rather than the message often improves the efficiency of the process because the message digest is usually much smaller in size than the message. The same hash algorithm must be used by the verifier of a digital signature as was used by the creator of the digital signature."
Diese Funktion gibt den berechneten SHA-1-Hash bei Erfolg oder FALSE.
Syntax
sha1_file( file,raw )
| Parameter | Beschreibung |
|---|---|
| file | Erforderlich. Die Datei berechnet werden |
| raw | Optional. Ein Boolescher Wert, hex oder binäres Ausgabeformat angibt:
|
Technische Details
| Rückgabewert: | Gibt den berechneten SHA-1-Hash bei Erfolg oder FALSE bei einem Fehler |
|---|---|
| PHP Version: | 4.3.0+ |
| Änderungsprotokoll: | Der rohe Parameter wurde optional in PHP 5.0 Ab PHP 5.1 ist es möglich , verwenden sha1_file() mit Wrapper, zB sha1_file("http://w3ii.com/..") |
Mehr Beispiele
Beispiel 1
Lagern Sie den SHA-1 - Hash "test.txt" in einer Datei:
<?php
$sha1file = sha1_file("test.txt");
file_put_contents("sha1file.txt",$sha1file);
?>Test , ob "test.txt" geändert worden ist (dh , wenn der SHA-1 Hash wurde geändert):
<?php
$sha1file = file_get_contents("sha1file.txt");
if (sha1_file("test.txt") == $sha1file)
{
echo "The file is ok.";
}
else
{
echo "The file has been changed.";
}
?>Der Ausgang des obigen Code könnten sein:
The file is ok.
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