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This is consistent with the general rules documented at the top of the file: - when computing GCD(A, N), there is no modular arithmetic, so the output can alias any of the inputs; - when computing a modular inverse, N is the modulus, so it can't be aliased by any of the outputs (we'll use it for modular operations over the entire course of the function's execution). But since this function has two modes of operations with different aliasing rules (G can alias N only if I == NULL), I think it should really be stated explicitly. Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>