Visual FoxPro

Duplicate OpensSSL Command that Decrypts Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Visual FoxPro

LOCAL lnSuccess
LOCAL loCrypt
LOCAL loPem
LOCAL loPrivkey
LOCAL loCert

lnSuccess = 0

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

loCrypt = CreateObject('Chilkat.Crypt2')

loCrypt.CryptAlgorithm = "pki"

loPem = CreateObject('Chilkat.Pem')
lnSuccess = loPem.LoadPemFile("qa_data/pem/myPem.pem","password")
IF (lnSuccess = 0) THEN
    ? loPem.LastErrorText
    RELEASE loCrypt
    RELEASE loPem
    CANCEL
ENDIF

loPrivkey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPem.PrivateKeyAt(0,loPrivkey)
IF (lnSuccess = 0) THEN
    ? loPem.LastErrorText
    RELEASE loCrypt
    RELEASE loPem
    RELEASE loPrivkey
    CANCEL
ENDIF

loCert = CreateObject('Chilkat.Cert')
lnSuccess = loPem.CertAt(0,loCert)
IF (lnSuccess = 0) THEN
    ? loPem.LastErrorText
    RELEASE loCrypt
    RELEASE loPem
    RELEASE loPrivkey
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loCrypt.SetDecryptCert2(loCert,loPrivkey)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loPem
    RELEASE loPrivkey
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loCrypt.CkDecryptFile("qa_data/infile.enc","qa_output/outfile.dat")
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loPem
    RELEASE loPrivkey
    RELEASE loCert
    CANCEL
ENDIF

? "Success."

RELEASE loCrypt
RELEASE loPem
RELEASE loPrivkey
RELEASE loCert