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(Excel) Verify Opaque Signature and Retrieve Signing Certificates

Demonstrates how to verify a PCKS7 opaque digital signature (signed data), extract the original file/data, and then extract the certificate(s) that were used to sign.

Download Excel Class Modules

Chilkat Excel Class Modules

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

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

'  Verify a PKCS7 signed-data (opaque signature) file and extract the original content to a file.

success = crypt.VerifyP7M("qa_data/p7m/opaqueSig.p7","qa_output/originalData.dat")
If (success <> True) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

'  Alternatively, we can do it in memory...
Dim binData As Chilkat.BinData
Set binData = Chilkat.NewBinData
success = binData.LoadFile("qa_data/p7m/opaqueSig.p7")
'  Your app should check for success, but we'll skip the check for brevity..

'  If verified, the signature is unwrapped and binData is replaced with the original data that was signed.
success = crypt.OpaqueVerifyBd(binData)
If (success <> True) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

'  For our testing, we signed some text, so we can get it from the binData..
Debug.Print "Original Data:"
Debug.Print binData.GetString("utf-8")

'  After any method call that verifies a signature, the crypt object will contain the certificate(s)
'  that were used for signing (assuming the X.509 certs were available in the signature, which is typically the case).

'  Get the number of signing certificates, and get each..

numCerts = crypt.NumSignerCerts

i = 0
Do While i < numCerts

    Set cert = crypt.GetSignerCert(i)
    Debug.Print cert.SubjectDN

    i = i + 1
Loop

'  We could also get the complete certificate chain of each signer cert,
'  assuming the certs in the chain of authentication to the trusted root
'  are available on the system, or provided to Chilkat by some other means
'  (such as via the XmlCertVault class, the TrustedRoots class, etc.)
i = 0
Do While i < numCerts

    Set certChain = crypt.GetSignerCertChain(i)
    '  You can examine the various properties and methods for certChain in the online
    '  reference documentation...

    i = i + 1
Loop

 

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