Chore: BufferTransformer #3942
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Chore: BufferTransformer #3942
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This demotes Block_Cipher::encrypt_n/decrypt_n to top-level methods and introduces new (private) virtual methods (encrypt/decrypt_blocks) that use std::span for the in/out buffers. Also, this adapts all block cipher implementations in the library to use the new API.
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Basically so, yeah. I wonder if we can fit in some other common functionality there, namely the word level loads/stores. That's a very common task (encrypt+decrypt for N ciphers plus alternative implementations) so if there is a nice way to make that work it would cut some complexity. Not necessary for the initial PR. I just found an explict slicer+stuffer quite verbose in the original change. |
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Description
This is in response of #3885 (comment): Combining the
BufferStufferandBufferSlicerinto aBufferTransformerthat always acts on two buffers (one input, one output) in lock-step. Block ciphers (and in particular implementations ofBlockCipher::encrypt_n()/::decrypt_n()) are a typical use case for this helper.I added this spike on #3870, which introduced
std::spanin the relevant methods, to simplify the integration. See Rohde-Schwarz@00ff565 for the relevant patch.@randombit Is that what you had in mind?