Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

PHP ActiveX Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Cloud Signature CSC
Code Signing
Compression
DKIM / DomainKey
DNS
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
Misc
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl
uncategorized

 

 

 

(PHP ActiveX) DSA R,S Signature Values

See more DSA Examples

Creates a DSA signature. Gets r,s values from the signature. Re-creates the DSA signature ASN.1 from the r,s values. Then verifies the signature using the re-created ASN.1 DSA signature.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2')
$crypt = new COM("Chilkat.Crypt2");

$crypt->EncodingMode = 'hex';
$crypt->HashAlgorithm = 'sha-1';

$hashStr = $crypt->hashFileENC('qa_data/hamlet.xml');
print 'hash to sign: ' . $hashStr . "\n";

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Dsa')
$dsa = new COM("Chilkat.Dsa");

$pemPrivateKey = $dsa->loadText('qa_data/dsa/dsaPrivKey2.pem');
$success = $dsa->FromPem($pemPrivateKey);
if ($success == 0) {
    print $dsa->LastErrorText . "\n";
    exit;
}

// Load the hash to be signed into the DSA object:
$success = $dsa->SetEncodedHash('hex',$hashStr);
if ($success == 0) {
    print $dsa->LastErrorText . "\n";
    exit;
}

// Sign the hash.
$success = $dsa->SignHash();
if ($success == 0) {
    print $dsa->LastErrorText . "\n";
    exit;
}

// Get the ASN.1 signature.
$asnSig = $dsa->getEncodedSignature('base64');
print 'Signature: ' . $asnSig . "\n";

// Examine the details of the ASN.1 signature.
// We want to get the r,s values as hex strings..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Asn')
$asn = new COM("Chilkat.Asn");
$success = $asn->LoadEncoded($asnSig,'base64');
if ($success == 0) {
    print $asn->LastErrorText . "\n";
    exit;
}

// Get the ASN.1 as XML.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Xml')
$xml = new COM("Chilkat.Xml");
$success = $xml->LoadXml($asn->asnToXml());
print 'Signature as XML: ' . "\n";
print $xml->getXml() . "\n";

// Sample XML shown here.
// The r and s values are the two hex strings in the XML.

// <?xml version="1.0" encoding="utf-8"?>
// <sequence>
//     <int>2C187F3AB6E47A66497B86CE97BB39E2133810F5</int>
//     <int>588E53D3F7B69636B48FD7175E99A3961BD7D775</int>
// </sequence>

// Pretend we're starting with r,s
$r = '2C187F3AB6E47A66497B86CE97BB39E2133810F5';
$s = '588E53D3F7B69636B48FD7175E99A3961BD7D775';

// Build the XML that will be converted to ASN.1
$xml->Clear();
$xml->Tag = 'sequence';
$xml->NewChild2('int',$r);
$xml->NewChild2('int',$s);

// Convert the XML to ASN.1
$success = $asn->LoadAsnXml($xml->getXml());

// Emit the signature as DER encoded ASN.1 (base64)
$asnSig = $asn->getEncodedDer('base64');

// --------------------------------------------------------------------
// Verify the signature using the asnSig we built from the r,s values
// --------------------------------------------------------------------

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Dsa')
$dsa2 = new COM("Chilkat.Dsa");

// Load the DSA public key to be used for verification:

$pemPublicKey = $dsa2->loadText('qa_data/dsa/dsaPubKey2.pem');
$success = $dsa2->FromPublicPem($pemPublicKey);
if ($success == 0) {
    print $dsa2->LastErrorText . "\n";
    exit;
}

// Load the hash to be verified.
$success = $dsa2->SetEncodedHash('hex',$hashStr);
if ($success == 0) {
    print $dsa2->LastErrorText . "\n";
    exit;
}

// Load the ASN.1 signature:
$success = $dsa2->SetEncodedSignature('base64',$asnSig);
if ($success == 0) {
    print $dsa2->LastErrorText . "\n";
    exit;
}

// Verify:
$success = $dsa2->Verify();
if ($success == 0) {
    print $dsa2->LastErrorText . "\n";
}
else {
    print 'DSA Signature Verified!' . "\n";
}


?>

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.