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Editorial Team
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Asked: 2026-06-06T16:45:00+00:00

I’d like to create a Base16 encoder and decoder for Lion’s new Security.framework to

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I’d like to create a Base16 encoder and decoder for Lion’s new Security.framework to complement kSecBase32Encoding and kSecBase64Encoding. Apple’s documentation shows how to write a custom transform (Caesar cipher) using SecTransformRegister. As far as I can tell, custom transforms registered this way have to operate symmetrically on the data and can’t be used to encode and decode data differently. Does anyone know if writing a custom encoder/decoder is possible, and if so, how?

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  1. Editorial Team

    I don’t see a way to tie custom encoders into SecEncodeTransformCreate(), which is what kSecBase32Encoding and the others are based on. But it’s easy to create a transform that accepts a “encoding” bool and makes use of that to decide whether to encode or decode. In the CaesarTransform example, they attach an attribute called key with SecTransformSetAttribute(). You’d do the same thing, but with a bool encode.

    And of course you could just create an encoding transform and a decoding transform.

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