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Add F* code extracted from the spec (#94)
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specs/kyber/proofs/fstar/extraction/Hacspec_kyber.Compress.fst
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| module Hacspec_kyber.Compress | ||
| #set-options "--fuel 0 --ifuel 1 --z3rlimit 15" | ||
| open Core | ||
|
|
||
| let compress | ||
| (re: | ||
| Hacspec_lib.Ring.t_PolynomialRingElement (Hacspec_lib.Field.t_PrimeFieldElement 3329us) | ||
| 256sz) | ||
| (bits_per_compressed_coefficient: usize) | ||
| : Hacspec_lib.Ring.t_PolynomialRingElement (Hacspec_lib.Field.t_PrimeFieldElement 3329us) 256sz = | ||
| Hacspec_lib.Ring.new_under_impl_2 (Core.Array.map_under_impl_23 (Hacspec_lib.Ring.coefficients_under_impl_2 | ||
| re | ||
| <: | ||
| array (Hacspec_lib.Field.t_PrimeFieldElement 3329us) 256sz) | ||
| (fun coefficient -> | ||
| compress_d coefficient bits_per_compressed_coefficient | ||
| <: | ||
| Hacspec_lib.Field.t_PrimeFieldElement 3329us) | ||
| <: | ||
| array (Hacspec_lib.Field.t_PrimeFieldElement 3329us) 256sz) | ||
|
|
||
| let decompress | ||
| (re: | ||
| Hacspec_lib.Ring.t_PolynomialRingElement (Hacspec_lib.Field.t_PrimeFieldElement 3329us) | ||
| 256sz) | ||
| (bits_per_compressed_coefficient: usize) | ||
| : Hacspec_lib.Ring.t_PolynomialRingElement (Hacspec_lib.Field.t_PrimeFieldElement 3329us) 256sz = | ||
| Hacspec_lib.Ring.new_under_impl_2 (Core.Array.map_under_impl_23 (Hacspec_lib.Ring.coefficients_under_impl_2 | ||
| re | ||
| <: | ||
| array (Hacspec_lib.Field.t_PrimeFieldElement 3329us) 256sz) | ||
| (fun coefficient -> | ||
| decompress_d coefficient bits_per_compressed_coefficient | ||
| <: | ||
| Hacspec_lib.Field.t_PrimeFieldElement 3329us) | ||
| <: | ||
| array (Hacspec_lib.Field.t_PrimeFieldElement 3329us) 256sz) | ||
|
|
||
| let compress_d (fe: Hacspec_lib.Field.t_PrimeFieldElement 3329us) (to_bit_size: usize) | ||
| : Hacspec_lib.Field.t_PrimeFieldElement 3329us = | ||
| let _:Prims.unit = | ||
| if ~.(to_bit_size <=. Hacspec_kyber.Parameters.v_BITS_PER_COEFFICIENT <: bool) | ||
| then | ||
| Rust_primitives.Hax.never_to_any (Core.Panicking.panic "assertion failed: to_bit_size <= parameters::BITS_PER_COEFFICIENT" | ||
|
|
||
| <: | ||
| Rust_primitives.Hax.t_Never) | ||
| in | ||
| let two_pow_bit_size:u32 = | ||
| Core.Num.pow_under_impl_8 2ul | ||
| (Core.Result.unwrap_or_else_under_impl (Core.Convert.TryInto.try_into to_bit_size | ||
| <: | ||
| Core.Result.t_Result u32 _) | ||
| (fun _ -> | ||
| Rust_primitives.Hax.never_to_any (Core.Panicking.panic_fmt (Core.Fmt.new_v1_under_impl_2 | ||
| (Rust_primitives.unsize (let list = | ||
| [ | ||
| "Conversion should work since to_bit_size is never greater than "; | ||
| "." | ||
| ] | ||
| in | ||
| FStar.Pervasives.assert_norm (Prims.eq2 (List.Tot.length list) 2); | ||
| Rust_primitives.Hax.array_of_list list) | ||
| <: | ||
| slice string) | ||
| (Rust_primitives.unsize (let list = | ||
| [ | ||
| Core.Fmt.Rt.new_display_under_impl_1 Hacspec_kyber.Parameters.v_BITS_PER_COEFFICIENT | ||
|
|
||
| <: | ||
| Core.Fmt.Rt.t_Argument | ||
| ] | ||
| in | ||
| FStar.Pervasives.assert_norm (Prims.eq2 (List.Tot.length list) 1); | ||
| Rust_primitives.Hax.array_of_list list) | ||
| <: | ||
| slice Core.Fmt.Rt.t_Argument) | ||
| <: | ||
| Core.Fmt.t_Arguments) | ||
| <: | ||
| Rust_primitives.Hax.t_Never) | ||
| <: | ||
| u32) | ||
| <: | ||
| u32) | ||
| in | ||
| let compressed:u32 = | ||
| ((((Core.Convert.From.from fe.Hacspec_lib.Field.PrimeFieldElement.f_value <: u32) *. 2ul <: u32) *. | ||
| two_pow_bit_size | ||
| <: | ||
| u32) +. | ||
| (Core.Convert.From.from Hacspec_lib.Field.v_MODULUS_1_under_impl_2 <: u32) | ||
| <: | ||
| u32) /. | ||
| (Core.Convert.From.from (2us *. Hacspec_lib.Field.v_MODULUS_1_under_impl_2 <: u16) <: u32) | ||
| in | ||
| Core.Convert.Into.into (compressed %. two_pow_bit_size <: u32) | ||
|
|
||
| let decompress_d (fe: Hacspec_lib.Field.t_PrimeFieldElement 3329us) (to_bit_size: usize) | ||
| : Hacspec_lib.Field.t_PrimeFieldElement 3329us = | ||
| let _:Prims.unit = | ||
| if ~.(to_bit_size <=. Hacspec_kyber.Parameters.v_BITS_PER_COEFFICIENT <: bool) | ||
| then | ||
| Rust_primitives.Hax.never_to_any (Core.Panicking.panic "assertion failed: to_bit_size <= parameters::BITS_PER_COEFFICIENT" | ||
|
|
||
| <: | ||
| Rust_primitives.Hax.t_Never) | ||
| in | ||
| let decompressed:u32 = | ||
| (((2ul *. (Core.Convert.From.from fe.Hacspec_lib.Field.PrimeFieldElement.f_value <: u32) <: u32) *. | ||
| (Core.Convert.From.from Hacspec_lib.Field.v_MODULUS_1_under_impl_2 <: u32) | ||
| <: | ||
| u32) +. | ||
| (1ul >>. to_bit_size <: u32) | ||
| <: | ||
| u32) <<. | ||
| (to_bit_size +. 1sz <: usize) | ||
| in | ||
| Core.Convert.Into.into decompressed |
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