PowerShell Requires Chilkat v11.0.0+

Aadhaar Paperless Offline e-kyc

See more XML Digital Signatures Examples

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. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  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 = New-Object Chilkat.Zip
$success = $zip.OpenZip("qa_data/xml_dsig/offline_paperless_kyc.zip")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

#  The .zip should contain 1 XML file.
$entry = New-Object Chilkat.ZipEntry
$success = $zip.EntryAt(0,$entry)
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

#  To get the contents, we need to specify the Share Phrase.
$sharePhrase = "Lock@487"
$zip.DecryptPassword = $sharePhrase

$bdXml = New-Object Chilkat.BinData
#  The XML file will be unzipped into the bdXml object.
$success = $entry.UnzipToBd($bdXml)
if ($success -eq $false) {
    $($entry.LastErrorText)
    exit
}

#  First verify the XML digital signature.
$dsig = New-Object Chilkat.XmlDSig
$success = $dsig.LoadSignatureBd($bdXml)
if ($success -eq $false) {
    $($dsig.LastErrorText)
    exit
}

#  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 = New-Object Chilkat.Cert
$success = $cert.LoadFromFile("qa_data/xml_dsig/uidai_auth_sign_prod_2023.cer")
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

#  Get the certificate's public key.
$pubKey = New-Object Chilkat.PublicKey
$cert.GetPublicKey($pubKey)

$dsig.SetPublicKey($pubKey)

#  The XML in this example contains only 1 signature.
$bVerifyReferenceDigests = $true
$bVerified = $dsig.VerifySignature($bVerifyReferenceDigests)
if ($bVerified -eq $false) {
    $($dsig.LastErrorText)
    $("The signature was not valid.")
    exit
}

$("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 = New-Object Chilkat.Crypt2
$crypt.HashAlgorithm = "sha256"
$crypt.EncodingMode = "hexlower"

$strToHash = "1234567890Lock@487"
$bdHash = New-Object Chilkat.BinData
$success = $bdHash.AppendString($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; $i -le $numTimesToHash; $i++) {
    $tmpStr = $crypt.HashBdENC($bdHash)
    $bdHash.Clear()
    $bdHash.AppendString($tmpStr,"utf-8")
}

$("Computed Mobile hash = " + $bdHash.GetString("utf-8"))

#  Let's get the mobile hash stored in the XML and compare it with our computed hash.
$xml = New-Object Chilkat.Xml
$success = $xml.LoadBd($bdXml,$true)
$m_hash = $xml.ChilkatPath("UidData|Poi|(m)")

$("Stored Mobile hash   = " + $m_hash)

#  Now do the same thing for the email hash:

$strToHash = "abc@gm.comLock@487"
$bdHash.Clear()
$success = $bdHash.AppendString($strToHash,"utf-8")

for ($i = 1; $i -le $numTimesToHash; $i++) {
    $tmpStr = $crypt.HashBdENC($bdHash)
    $bdHash.Clear()
    $bdHash.AppendString($tmpStr,"utf-8")
}

$("Computed Email hash = " + $bdHash.GetString("utf-8"))

$e_hash = $xml.ChilkatPath("UidData|Poi|(e)")
$("Stored Email hash   = " + $e_hash)