Decrypt S/MIME with an Explicit Certificate and Private Key

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

Decrypt2 accepts the certificate and its private key directly as arguments.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

integer li_rc
integer li_Success
oleobject loo_Mime
oleobject loo_Cert
oleobject loo_PrivKey
string ls_Body

li_Success = 0

loo_Mime = create oleobject
li_rc = loo_Mime.ConnectToNewObject("Chilkat.Mime")
if li_rc < 0 then
    destroy loo_Mime
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_Mime.LoadMimeFile("qa_data/encrypted.eml")
if li_Success = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    return
end if

//  Decrypt using an explicitly supplied certificate and private key.  The 1st argument is the
//  certificate and the 2nd is its private key.
loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Cert.LoadFromFile("qa_data/recipient.cer")
if li_Success = 0 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Mime
    destroy loo_Cert
    return
end if

loo_PrivKey = create oleobject
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")

li_Success = loo_PrivKey.LoadPemFile("qa_data/recipient_privkey.pem")
if li_Success = 0 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_Mime
    destroy loo_Cert
    destroy loo_PrivKey
    return
end if

li_Success = loo_Mime.Decrypt2(loo_Cert,loo_PrivKey)
if li_Success = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    destroy loo_Cert
    destroy loo_PrivKey
    return
end if

ls_Body = loo_Mime.GetBodyDecoded()
if loo_Mime.LastMethodSuccess = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    destroy loo_Cert
    destroy loo_PrivKey
    return
end if

Write-Debug ls_Body


destroy loo_Mime
destroy loo_Cert
destroy loo_PrivKey