B4X

Duplicate OpensSSL to Create Signature using Cert and Key Files

See more OpenSSL Examples

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

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 cert and private key from separate files.
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadFromFile("myCert.crt")
If success <> True Then
    Log(cert.LastErrorText)
    Return
End If


Dim bd As ChilkatBinData
bd.Initialize
success = bd.LoadFile("cert.key")
Dim privkey As ChilkatPrivateKey
privkey.Initialize("privkey")
'  Load from any format private key.
'  If the file does not need a password, the 2nd arg is ignored.
success = privkey.LoadAnyFormat(bd, "password_if_needed")
If success <> True Then
    Log(privkey.LastErrorText)
    Return
End If


success = crypt.SetSigningCert2(cert, privkey)
If success <> True 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.der")
If success <> True Then
    Log(crypt.LastErrorText)
    Return
End If


Log("Success.")