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

Excel 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

 

 

 

(Excel) Create and Verify an Opaque PKCS7/CMS Signature

Demonstrates how to create a PKCS7 opaque signature, and also how to verify an opaque signature. An opaque signature is different than a detached PKCS7 signature in that it contains the original data. Verifying an opaque signature retrieves the original content.

Download Excel Class Modules

Chilkat Excel Class Modules

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

Dim crypt As Chilkat.Crypt2
Set crypt = Chilkat.NewCrypt2

' A certificate and private key is needed to create a signature.
' Chilkat provides many different ways to load a certificate and private key, such
' as from a PFX/.p12, Java keystore, JWK, Windows registry-based certificate stores, and other sources.
' This example will load the certificate from a .crt and the private key from a .key file

Dim cert As Chilkat.Cert
Set cert = Chilkat.NewCert
' The LoadFromFile method will automatically detect the format and load it.

success = cert.LoadFromFile("qa_data/certs/test_12345678a.cer")
If (success <> True) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

' Our private key is in an encrypted PKCS8 format.
' If you don't know the format of your key, but you do know it's encrypted,
' and requires a password, then just call any of the Chilkat methods that load
' a private key w/ a password argument.  Chilkat will auto-detect the format
' and load it correctly even if it's not the format indicated by the method name..
Dim privKey As Chilkat.PrivateKey
Set privKey = Chilkat.NewPrivateKey

password = "12345678a"
success = privKey.LoadPkcs8EncryptedFile("qa_data/certs/test_12345678a.key",password)
If (success <> True) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

' Set properties required for signing.

' Tell it to use the cert and private key we've loaded.
success = crypt.SetSigningCert2(cert,privKey)
If (success <> True) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

' Indicate we want the opaque signature in base64 format:
crypt.EncodingMode = "base64"

' Sign the string using the "utf-8" byte representation:
crypt.Charset = "utf-8"

' Create the opaque signature:

originalData = "This is the string to be signed."

opaqueSig = crypt.OpaqueSignStringENC(originalData)

Debug.Print opaqueSig

' The output looks like this:
' MIIPgQYJKoZIhvcNAQcCoIIPcjCCD24CAQExCzAJBgUrDgMCGgUAMC8GCSqGSIb3DQEHAaAiBCBUaGlzIGlzIHRoZSBzdHJpbmcgdG8gYmUgc...

' ----------------------------------------------------------------------------------------------
' Now let's verify the signature and retrieve the original data.
' We'll use a new Crypt2 object to keep things completely separate...

Dim vCrypt As Chilkat.Crypt2
Set vCrypt = Chilkat.NewCrypt2

' We only need the certificate to verify a signature (and extract the data from
' an opaque signature).  The public key is always embedded within a certificate.
success = vCrypt.SetVerifyCert(cert)
If (success <> True) Then
    Debug.Print vCrypt.LastErrorText
    Exit Sub
End If

vCrypt.EncodingMode = "base64"
vCrypt.Charset = "utf-8"


extractedData = vCrypt.OpaqueVerifyStringENC(opaqueSig)
If (vCrypt.LastMethodSuccess <> True) Then
    Debug.Print vCrypt.LastErrorText
    Exit Sub
End If

Debug.Print "The extracted data: "; extractedData

' The output is:
' The extracted data: This is the string to be signed.

 

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