Visual FoxPro

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*...

Visual FoxPro

LOCAL lnSuccess
LOCAL loCrypt
LOCAL loCert
LOCAL loBd
LOCAL loPrivkey

lnSuccess = 0

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

loCrypt = CreateObject('Chilkat.Crypt2')

* Load the cert and private key from separate files.
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadFromFile("myCert.crt")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

loBd = CreateObject('Chilkat.BinData')
lnSuccess = loBd.LoadFile("cert.key")
loPrivkey = CreateObject('Chilkat.PrivateKey')
* Load from any format private key.
* If the file does not need a password, the 2nd arg is ignored.
lnSuccess = loPrivkey.LoadAnyFormat(loBd,"password_if_needed")
IF (lnSuccess <> 1) THEN
    ? loPrivkey.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loBd
    RELEASE loPrivkey
    CANCEL
ENDIF

lnSuccess = loCrypt.SetSigningCert2(loCert,loPrivkey)
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loBd
    RELEASE loPrivkey
    CANCEL
ENDIF

* Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
lnSuccess = loCrypt.CreateP7M("qa_data/infile.anything","qa_output/outfile.der")
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loBd
    RELEASE loPrivkey
    CANCEL
ENDIF

? "Success."

RELEASE loCrypt
RELEASE loCert
RELEASE loBd
RELEASE loPrivkey