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The decoding leaked some information about the delimiter index
due to copying only exactly input_len - delim_idx bytes. I can't
articulate a specific attack that would work here, but it is easy
enough to fix this to run in const time instead, where all bytes
are accessed regardless of the length of the padding.
CT::copy_out is O(n^2) and thus terrible, but in practice it is only
used with RSA decryption, and multiplication is also O(n^2) with the
modulus size, so a few extra cycles here doesn't matter much.
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