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

Delphi DLL 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
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

 

 

 

(Delphi DLL) Aadhaar Paperless Offline e-kyc

Opens an encrypted .zip containing Aadhaar Paperless Offline e-KYC XML. Gets the XML and validates the digital signature. Then computes the hash for the mobile number and Email ID.

For more information, see https://uidai.gov.in/ecosystem/authentication-devices-documents/about-aadhaar-paperless-offline-e-kyc.html

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, XmlDSig, Zip, PublicKey, BinData, ZipEntry, Cert, Crypt2, Xml;

...

procedure TForm1.Button1Click(Sender: TObject);
var
zip: HCkZip;
success: Boolean;
entry: HCkZipEntry;
sharePhrase: PWideChar;
bdXml: HCkBinData;
dsig: HCkXmlDSig;
cert: HCkCert;
pubKey: HCkPublicKey;
bVerifyReferenceDigests: Boolean;
bVerified: Boolean;
crypt: HCkCrypt2;
strToHash: PWideChar;
bdHash: HCkBinData;
numTimesToHash: Integer;
i: Integer;
tmpStr: PWideChar;
xml: HCkXml;
m_hash: PWideChar;
tmpStr: PWideChar;
e_hash: PWideChar;

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

// Open the .zip containing the Aadhaar Paperless Offline e-KYC XML.
// The .zip is encrypted using the "Share Phrase".
zip := CkZip_Create();
success := CkZip_OpenZip(zip,'qa_data/xml_dsig/offline_paperless_kyc.zip');
if (success = False) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

// The .zip should contain 1 XML file.
entry := CkZip_GetEntryByIndex(zip,0);
if (CkZip_getLastMethodSuccess(zip) = False) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

// To get the contents, we need to specify the Share Phrase.
sharePhrase := 'Lock@487';
CkZip_putDecryptPassword(zip,sharePhrase);

bdXml := CkBinData_Create();
// The XML file will be unzipped into the bdXml object.
success := CkZipEntry_UnzipToBd(entry,bdXml);
if (success = False) then
  begin
    Memo1.Lines.Add(CkZipEntry__lastErrorText(entry));
    CkZipEntry_Dispose(entry);
    Exit;
  end;

CkZipEntry_Dispose(entry);

// First verify the XML digital signature.
dsig := CkXmlDSig_Create();
success := CkXmlDSig_LoadSignatureBd(dsig,bdXml);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmlDSig__lastErrorText(dsig));
    Exit;
  end;

// The UIDAI XML signature does not contain the KeyInfo, so we must load the uidai certificate
// and indicate that its public key is to be used for verifying the signature.
cert := CkCert_Create();
success := CkCert_LoadFromFile(cert,'qa_data/xml_dsig/uidai_auth_sign_prod_2023.cer');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

// Get the certificate's public key.
pubKey := CkCert_ExportPublicKey(cert);
success := CkXmlDSig_SetPublicKey(dsig,pubKey);
CkPublicKey_Dispose(pubKey);

// The XML in this example contains only 1 signature.
bVerifyReferenceDigests := True;
bVerified := CkXmlDSig_VerifySignature(dsig,bVerifyReferenceDigests);
if (bVerified = False) then
  begin
    Memo1.Lines.Add(CkXmlDSig__lastErrorText(dsig));
    Memo1.Lines.Add('The signature was not valid.');
    Exit;
  end;

Memo1.Lines.Add('The XML digital signature is valid.');

// Let's compute the hash for the Mobile Number.

// 	Hashing logic for Mobile Number :
// 	Sha256(Sha256(Mobile+SharePhrase))*number of times last digit of Aadhaar number
// 	(Ref ID field contains last 4 digits).
// 
// 	Example :
// 	Mobile: 1234567890
// 	Aadhaar Number:XXXX XXXX 3632
// 	Passcode : Lock@487
// 	Hash: Sha256(Sha256(1234567890Lock@487))*2
// 	In case of Aadhaar number ends with Zero we will hashed one time.

crypt := CkCrypt2_Create();
CkCrypt2_putHashAlgorithm(crypt,'sha256');
CkCrypt2_putEncodingMode(crypt,'hexlower');

strToHash := '1234567890Lock@487';
bdHash := CkBinData_Create();
success := CkBinData_AppendString(bdHash,strToHash,'utf-8');

// Hash a number of times equal to the last digit of your Aadhaar number.
// If the Aadhaar number ends with 0, then hash one time.
// For this example, we'll just set the number of times to hash
// for the case where an Aadhaar number ends in "9"
numTimesToHash := 9;

for i := 1 to numTimesToHash do
  begin
    tmpStr := CkCrypt2__hashBdENC(crypt,bdHash);
    CkBinData_Clear(bdHash);
    CkBinData_AppendString(bdHash,tmpStr,'utf-8');
  end;

Memo1.Lines.Add('Computed Mobile hash = ' + CkBinData__getString(bdHash,'utf-8'));

// Let's get the mobile hash stored in the XML and compare it with our computed hash.
xml := CkXml_Create();
success := CkXml_LoadBd(xml,bdXml,True);
m_hash := CkXml__chilkatPath(xml,'UidData|Poi|(m)');

Memo1.Lines.Add('Stored Mobile hash   = ' + m_hash);

// Now do the same thing for the email hash:

strToHash := 'abc@gm.comLock@487';
CkBinData_Clear(bdHash);
success := CkBinData_AppendString(bdHash,strToHash,'utf-8');

for i := 1 to numTimesToHash do
  begin
    tmpStr := CkCrypt2__hashBdENC(crypt,bdHash);
    CkBinData_Clear(bdHash);
    CkBinData_AppendString(bdHash,tmpStr,'utf-8');
  end;

Memo1.Lines.Add('Computed Email hash = ' + CkBinData__getString(bdHash,'utf-8'));

e_hash := CkXml__chilkatPath(xml,'UidData|Poi|(e)');
Memo1.Lines.Add('Stored Email hash   = ' + e_hash);

CkZip_Dispose(zip);
CkBinData_Dispose(bdXml);
CkXmlDSig_Dispose(dsig);
CkCert_Dispose(cert);
CkCrypt2_Dispose(crypt);
CkBinData_Dispose(bdHash);
CkXml_Dispose(xml);

end;

 

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