B4X

Duplicate openssl smime -decrypt -in some_file.dat.enc -binary -inform DER -inkey private.key -out some_file.dat

See more OpenSSL Examples

Demonstrates how to decrypt binary DER that was encrypted using the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

B4X

Dim success As Boolean = False

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

'  Duplicates the following openssl command:
'  openssl smime -decrypt -in hello.txt.enc -binary -inform DER -inkey private.key -out hello.txt

Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadFromFile("qa_data/openssl/EE.cer")
If success = False Then
    Log(cert.LastErrorText)
    Return
End If


Dim bd As ChilkatBinData
bd.Initialize
success = bd.LoadFile("qa_data/openssl/EE.key")
'  Assuming success..

Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadAnyFormat(bd, "")
If success = False Then
    Log(privKey.LastErrorText)
    Return
End If


Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")
success = crypt.SetDecryptCert2(cert, privKey)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


crypt.CryptAlgorithm = "PKI"
success = crypt.CkDecryptFile("qa_data/openssl/hello.txt.enc", "qa_output/hello.txt")
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


Log("Success.")