Exemplu
Calculați hash SHA-1 al fișierului text "test.txt" :
<?php
$filename = "test.txt";
$sha1file = sha1_file($filename);
echo $sha1file;
?>Ieșirea codului de mai sus va fi:
aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
Definiție și utilizare
sha1_file() Funcția calculează hash SHA-1 a unui fișier.
sha1_file() Funcția utilizează US Secure Hash Algorithm 1.
De la RFC 3174 - SUA 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." de "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." al "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." să "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." de "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." de "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." de "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." de "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." a "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."
Această funcție returnează calculat hash SHA-1 în caz de succes, sau FALSE în cazul eșecului.
Sintaxă
sha1_file( file,raw )
| Parametru | Descriere |
|---|---|
| file | Necesar. Fișierul care urmează să fie calculate |
| raw | Opțional. O valoare boolean care specifică hex sau formatul de ieșire binar:
|
Detalii tehnice
| Întoarcere Valoare: | Returnează calculat hash SHA-1 în caz de succes, sau FALSE în caz de eșec |
|---|---|
| Versiune PHP: | 4.3.0+ |
| Changelog: | Parametrul brut a devenit opțional în PHP 5.0 Ca de PHP 5.1, este posibil să se utilizeze sha1_file() cu ambalaje, de exemplu , sha1_file("http://w3ii.com/..") |
Mai multe exemple
Exemplul 1
Păstrați hash SHA-1 a "test.txt" într - un fișier:
<?php
$sha1file = sha1_file("test.txt");
file_put_contents("sha1file.txt",$sha1file);
?>Testul în cazul în care "test.txt" a fost modificat (care este în cazul în care hash SHA-1 a fost modificat):
<?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.";
}
?>Ieșirea codului de mai sus ar putea fi:
The file is ok.
<PHP String Reference