Module fiat_crypto::p256_32
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Autogenerated: ‘src/ExtractionOCaml/word_by_word_montgomery’ –lang Rust –inline p256 32 ‘2^256 - 2^224 + 2^192 + 2^96 - 1’ mul square add sub opp from_montgomery to_montgomery nonzero selectznz to_bytes from_bytes one msat divstep divstep_precomp curve description: p256 machine_wordsize = 32 (from “32”) requested operations: mul, square, add, sub, opp, from_montgomery, to_montgomery, nonzero, selectznz, to_bytes, from_bytes, one, msat, divstep, divstep_precomp m = 0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff (from “2^256 - 2^224 + 2^192 + 2^96 - 1”)
NOTE: In addition to the bounds specified above each function, all functions synthesized for this Montgomery arithmetic require the input to be strictly less than the prime modulus (m), and also require the input to be in the unique saturated representation. All functions also ensure that these two properties are true of return values.
Computed values: eval z = z[0] + (z[1] << 32) + (z[2] << 64) + (z[3] << 96) + (z[4] << 128) + (z[5] << 160) + (z[6] << 192) + (z[7] << 224) bytes_eval z = z[0] + (z[1] << 8) + (z[2] << 16) + (z[3] << 24) + (z[4] << 32) + (z[5] << 40) + (z[6] << 48) + (z[7] << 56) + (z[8] << 64) + (z[9] << 72) + (z[10] << 80) + (z[11] << 88) + (z[12] << 96) + (z[13] << 104) + (z[14] << 112) + (z[15] << 120) + (z[16] << 128) + (z[17] << 136) + (z[18] << 144) + (z[19] << 152) + (z[20] << 160) + (z[21] << 168) + (z[22] << 176) + (z[23] << 184) + (z[24] << 192) + (z[25] << 200) + (z[26] << 208) + (z[27] << 216) + (z[28] << 224) + (z[29] << 232) + (z[30] << 240) + (z[31] << 248) twos_complement_eval z = let x1 := z[0] + (z[1] << 32) + (z[2] << 64) + (z[3] << 96) + (z[4] << 128) + (z[5] << 160) + (z[6] << 192) + (z[7] << 224) in if x1 & (2^256-1) < 2^255 then x1 & (2^256-1) else (x1 & (2^256-1)) - 2^256
Functions
- The function fiat_p256_add adds two field elements in the Montgomery domain.
- The function fiat_p256_addcarryx_u32 is an addition with carry.
- The function fiat_p256_cmovznz_u32 is a single-word conditional move.
- The function fiat_p256_divstep computes a divstep.
- The function fiat_p256_divstep_precomp returns the precomputed value for Bernstein-Yang-inversion (in montgomery form).
- The function fiat_p256_from_bytes deserializes a field element NOT in the Montgomery domain from bytes in little-endian order.
- The function fiat_p256_from_montgomery translates a field element out of the Montgomery domain.
- The function fiat_p256_msat returns the saturated representation of the prime modulus.
- The function fiat_p256_mul multiplies two field elements in the Montgomery domain.
- The function fiat_p256_mulx_u32 is a multiplication, returning the full double-width result.
- The function fiat_p256_nonzero outputs a single non-zero word if the input is non-zero and zero otherwise.
- The function fiat_p256_opp negates a field element in the Montgomery domain.
- The function fiat_p256_selectznz is a multi-limb conditional select.
- The function fiat_p256_set_one returns the field element one in the Montgomery domain.
- The function fiat_p256_square squares a field element in the Montgomery domain.
- The function fiat_p256_sub subtracts two field elements in the Montgomery domain.
- The function fiat_p256_subborrowx_u32 is a subtraction with borrow.
- The function fiat_p256_to_bytes serializes a field element NOT in the Montgomery domain to bytes in little-endian order.
- The function fiat_p256_to_montgomery translates a field element into the Montgomery domain.