DataFlex

Set the OAEP Hash Algorithm for Encrypted Email

Demonstrates the Chilkat Email.OaepHash property, which selects the hash algorithm used by OAEP padding when encrypting email with RSAES-OAEP. Valid values are sha1, sha256, sha384, and sha512; the default is sha256. This property is used only when OaepPadding is true, so this example enables OAEP first.

Background: OAEP ("Optimal Asymmetric Encryption Padding") uses a hash function internally as part of the randomized padding it wraps around the data before RSA encryption. The choice of hash affects security and, importantly, interoperability: the sender and recipient must use the same OAEP hash, or decryption fails. That is why this is exposed as an explicit setting rather than left implicit.

Chilkat DataFlex Downloads

Download Chilkat for DataFlex

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoEmail
    String sTemp1

    //  Demonstrates the Email.OaepHash property, which selects the hash algorithm used by
    //  OAEP padding when encrypting email with RSAES-OAEP.  Valid values: sha1, sha256,
    //  sha384, sha512.  The default is sha256.  It is used only when OaepPadding is true.

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End
    Set ComSubject Of hoEmail To "Encrypted with RSAES-OAEP"

    //  OAEP padding must be enabled for the OAEP hash to take effect.
    Set ComOaepPadding Of hoEmail To True
    Set ComOaepHash Of hoEmail To "sha256"

    Get ComOaepHash Of hoEmail To sTemp1
    Showln "OaepHash = " sTemp1


End_Procedure