Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

VB.NET UWP/WinRT Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
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
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
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(VB.NET UWP/WinRT) Extract PKCS7 Signature Digest

Demonstrates how to extract a signature digest from a PKCS7 signature.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

' This example requires the Chilkat Crypt API to have been previously unlocked.
' See Unlock Chilkat Crypt for sample code.

Dim crypt As New Chilkat.Crypt2

Dim p7mFile As String = "qa_data/p7m/test.pdf.p7m"
Dim outPath As String = "qa_output/test.pdf"

' First let's see if this .p7m signature can be verified, and the original file extracted.
Dim verified As Boolean = crypt.VerifyP7M(p7mFile,outPath)
If (verified <> True) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


' How many signers?
' (The NumSignerCerts property is set whenever a signature is verified.)
Debug.WriteLine("Num Signers: " & crypt.NumSignerCerts)

' Load the .p7m into memory...
Dim pkcs7Data As New Chilkat.BinData
pkcs7Data.LoadFile(p7mFile)

' Check to see if this .p7m contains the binary bytes, or if it's
' already base64 encoded.  Get the 1st two bytes.  If the first two 
' bytes are the us-ascii values "MI", then we have base64.
Dim sbBase64 As New Chilkat.StringBuilder
Dim hexStr As String = pkcs7Data.GetEncodedChunk(0,2,"hex")
sbBase64.Append(hexStr)

Dim bHaveBase64 As Boolean = False
If (sbBase64.ContentsEqual("4D49",True) = True) Then
    bHaveBase64 = True
    sbBase64.Clear()
    sbBase64.AppendBd(pkcs7Data,"utf-8",0,0)
End If


' Get each signer's signature digest.
crypt.EncodingMode = "base64"
Dim i As Integer = 0
Dim digest As String
While i < crypt.NumSignerCerts
    If (bHaveBase64) Then
        digest = crypt.Pkcs7ExtractDigest(i,sbBase64.GetAsString())
    Else
        digest = crypt.Pkcs7ExtractDigest(i,pkcs7Data.GetEncoded("base64"))
    End If

    If (crypt.LastMethodSuccess <> True) Then
        Debug.WriteLine(crypt.LastErrorText)
        Exit Sub
    End If

    Debug.WriteLine("Signer " & (i + 1) & " digest = " & digest)
    i = i + 1
End While

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.