PureBasic

Decrypt Email using RSAES-OAEP with AES-128 CBC and SHA256

See more Email Object Examples

Demonstrates how to decrypt an email that was encrypted using RSAES-OAEP with SHA256 and AES-128 content encryption.

Note: This example requires Chilkat v9.5.0.67 or greater.

PureBasic

IncludeFile "CkEmail.pb"

Procedure ChilkatExample()

    success.i = 0

    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; To decrypt an email, we must provide the certificate + private key
    ; that matches the cert + public key that was used to encrypt.
    ; This can be done by adding PFX sources.
    ; (On a Windows system, if the cert+private key was installed on the system,
    ; then Chilkat should automatically find the matching cert+key and use it to decrypt.)

    success = CkEmail::ckAddPfxSourceFile(email,"qa_data/rsaes-oaep/cert_plus_privatekey.pfx","PFX_PASSWORD")
    If success <> 1
        Debug CkEmail::ckLastErrorText(email)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; Email objects automatically decrypt when loaded from a file, or when loaded from MIME (which
    ; includes when being downloaded from a mail server).
    success = CkEmail::ckLoadEml(email,"qa_data/rsaes-oaep/rsaes-oaep-encrypted.eml")
    If success <> 1
        Debug CkEmail::ckLastErrorText(email)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; Note: It is not necessary to know in advance the algorithms needed to decrypt.
    ; The information about the RSA algorithm (OAEP vs PKCS-v1_5), the OAEP hash algorithm,
    ; and the content encryption algorithm (such as AES-128), are all contained within
    ; the PKCS7 ASN.1 structures and any decryptor would read these to know what to do.

    ; We can check to see if the email was actually encrypted, and if so, whether it
    ; was successfully decrypted:
    If CkEmail::ckReceivedEncrypted(email) = 1
        Debug "This email was encrypted."
    Else
        Debug "This email was not actually encrypted."
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; Now check to see if it was successfully decrypted.
    If CkEmail::ckDecrypted(email) <> 1
        Debug "Unable to decrypt this email."
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; Save the decrypted .eml
    success = CkEmail::ckSaveEml(email,"qa_output/decrypted.eml")

    ; OK.. getting here means the email was decrypted.
    Debug "The email was successfully decrypted."

    ; The MIME of an encrypted email looks like this:

    ; MIME-Version: 1.0
    ; Date: Tue, 18 Apr 2017 10:12:16 -0500
    ; Message-ID: <7ED75DF554717DC7994D7EB757E30709E8733C5C@CHILKAT13>
    ; Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
    ; X-Priority: 3 (Normal)
    ; Subject: This is a sample email
    ; To: "Chilkat Support" <support@chilkatsoft.com>
    ; From: "Chilkat GMail" <chilkat.support@gmail.com>
    ; Content-Disposition: attachment; filename="smime.p7m"
    ; Content-Transfer-Encoding: base64
    ; 
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    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure