B4X Requires Chilkat v11.0.0+

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).

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")

crypt.CryptAlgorithm = "pki"

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.SetDecryptCert2(cert, privkey)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


success = crypt.CkDecryptFile("qa_data/infile.enc", "qa_output/outfile.dat")
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


Log("Success.")