Lianja

Decrypt S/MIME using a Certificate with Private Key Access

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

DecryptUsingCert takes a single certificate that already has access to its associated private key, for example a certificate loaded from a PFX.

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. A public-only certificate is insufficient for decryption. The certificate passed to DecryptUsingCert must be linked to its private key, as happens when it is loaded from a PFX/P12 file.

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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 a certificate that already provides access to its private key (for example loaded
//  from a PFX).  The only argument is the certificate.
lcPfxPassword = "myPfxPassword"
loCert = createobject("CkCert")
llSuccess = loCert.LoadPfxFile("qa_data/recipient.pfx",lcPfxPassword)
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loMime
    release loCert
    return
endif

llSuccess = loMime.DecryptUsingCert(loCert)
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    release loCert
    return
endif

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

? lcBody


release loMime
release loCert