B4X Requires Chilkat v11.0.0+

Duplicate OpensSSL to Sign File and Output Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

B4X

Dim success As Boolean = False

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

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

'  Load the PEM containing cert + private key.
Dim pem As ChilkatPem
pem.Initialize
success = pem.LoadPemFile("qa_data/pem/myPem.pem", "password")
If success = False Then
    Log(pem.LastErrorText)
    Return
End If


Dim privkey As ChilkatPrivateKey
privkey.Initialize("privkey")
success = pem.PrivateKeyAt(0, privkey)
If success = False Then
    Log(pem.LastErrorText)
    Return
End If


Dim cert As ChilkatCert
cert.Initialize("cert")
success = pem.CertAt(0, cert)
If success = False Then
    Log(pem.LastErrorText)
    Return
End If



success = crypt.SetSigningCert2(cert, privkey)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


'  Alternatively, we could use a .pfx/.p12 file.
'  (Chilkat also supports other formats/sources for cert/private keys...)
Dim certFromP12 As ChilkatCert
certFromP12.Initialize("certFromP12")
success = certFromP12.LoadPfxFile("qa_data/p12/myP12.p12", "password")
If success = False Then
    Log(certFromP12.LastErrorText)
    Return
End If


'  The certificate, when loaded from a .pfx/.p12, will automatically 
'  include the associated private key, assuming it's present in the .p12.
'  We don't have to explicitly provide the private key as in the
'  lines of code above that use the PEM file.
success = crypt.SetSigningCert(certFromP12)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


'  Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
success = crypt.CreateP7M("qa_data/infile.anything", "qa_output/outfile.p7m")
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


Log("Success.")