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Bug in CMAC with AES256 key #200

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huckym opened this issue Jul 20, 2023 · 1 comment
Open

Bug in CMAC with AES256 key #200

huckym opened this issue Jul 20, 2023 · 1 comment

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@huckym
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huckym commented Jul 20, 2023

IV needs to match block size but the key size could be 256bit.
CMAC.init works fine if coincidentally AES128 keys are used because the blocksize and key size are same. Breaks for AES256

https://github.com/bcgit/pc-dart/blob/59e06028bff338adc7d25ff9da4063a3b2e28b4c/lib/macs/cmac.dart#L185C5-L185C52
@smlu smlu mentioned this issue Jun 27, 2024
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@smlu
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smlu commented Jun 27, 2024

+1 Up voting this issue...
The IV size is definitively wrong for block cipher modes. It should match the block size.

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@huckym @smlu