Lianja

Decrypt S/MIME with an Explicit Certificate and Private Key

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.

Background. When the certificate and private key are already loaded as separate objects, Decrypt2 uses them directly rather than searching an internal collection of credential sources.

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llSuccess = .F.

loMime = createobject("CkMime")
llSuccess = loMime.LoadMimeFile("qa_data/encrypted.eml")
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    return
endif

//  Decrypt using an explicitly supplied certificate and private key.  The 1st argument is the
//  certificate and the 2nd is its private key.
loCert = createobject("CkCert")
llSuccess = loCert.LoadFromFile("qa_data/recipient.cer")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loMime
    release loCert
    return
endif

loPrivKey = createobject("CkPrivateKey")
llSuccess = loPrivKey.LoadPemFile("qa_data/recipient_privkey.pem")
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loMime
    release loCert
    release loPrivKey
    return
endif

llSuccess = loMime.Decrypt2(loCert,loPrivKey)
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    release loCert
    release loPrivKey
    return
endif

lcBody = loMime.GetBodyDecoded()
if (loMime.LastMethodSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    release loCert
    release loPrivKey
    return
endif

? lcBody


release loMime
release loCert
release loPrivKey