| The code is as follows |
Copy Code |
|
<?php
/**
* Verify Signature
* Tobeverified to be verified signed ciphertext
* PlainText the plaintext of the signature to be verified
* CertFile signer's public key certificate
* Return validation successfully returns TRUE, Failure returns false (reason for failure from lasterrmsg property)
*/
function verifymsg ($TobeVerified, $PlainText, $CertFile, $signature _alg=openssl_algo_sha1)
{
Check with public key
$FP =fopen ($CertFile, "R");
if (! $fp)
{
echo "Error number:-10005, error description:er_find_cert_failed (Cannot find certificate)";
return false;
}
$pub _key=fread ($fp, 8192);
Fclose ($FP);
$res = Openssl_get_publickey ($pub _key);
if (1==openssl_verify ($PlainText, Pack ("H". strlen ($TobeVerified), $TobeVerified), $res, $signature _alg))
{
Print ("Www.111cn.net prompts you: Verify success". "<br>");
return true;
}
Else
{
echo "Error number:-10021, error description:er_verify_error (verification failure) |". Openssl_error_string ();
return false;
}
}
?>
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Openssl_verify may have three return value 1,0,-1, only 1 to indicate successful verification signatures.
$signature _alg default OPENSSL_ALGO_SHA1, if DSA encryption is set to Openssl_algo_dss1
