Check kernel linear transform slot sizes per ciphertext. - #3424
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`kernel.linear_transform` is elementwise over its `input`: each ciphertext of a `tensor<Kx!ct>` is transformed independently with the same diagonals. The verifier instead compared the diagonals against `K * slots`, and it skipped the check for a scalar ciphertext, so the check disappeared after elementwise-to-affine. * Compare diagonal width against a single ciphertext's slot count for both scalar and tensor-of-ciphertext inputs; cleartext inputs are unchanged. * Share the logic with `kernel.apply_linear_transform` through `getInputSlotSize`. * Reject dynamic dimensions in general PiperOrigin-RevId: 987674972
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This is a minor cleanup rebased over #3423 (so maybe diff against that branch to see the proper diff, sorry!) |
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Check kernel linear transform slot sizes per ciphertext.
kernel.linear_transformis elementwise over itsinput: each ciphertextof a
tensor<Kx!ct>is transformed independently with the same diagonals.The verifier instead compared the diagonals against
K * slots, and itskipped the check for a scalar ciphertext, so the check disappeared after
elementwise-to-affine.
scalar and tensor-of-ciphertext inputs; cleartext inputs are unchanged.
kernel.apply_linear_transformthroughgetInputSlotSize.