Expand description
Autogenerated: ‘src/ExtractionOCaml/word_by_word_montgomery’ –lang Rust –inline secp256k1_montgomery_scalar 64 ‘2^256 - 432420386565659656852420866394968145599’ mul square add sub opp from_montgomery to_montgomery nonzero selectznz to_bytes from_bytes one msat divstep divstep_precomp curve description: secp256k1_montgomery_scalar machine_wordsize = 64 (from “64”) requested operations: mul, square, add, sub, opp, from_montgomery, to_montgomery, nonzero, selectznz, to_bytes, from_bytes, one, msat, divstep, divstep_precomp m = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141 (from “2^256 - 432420386565659656852420866394968145599”)
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] << 64) + (z[2] << 128) + (z[3] << 192) 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] << 64) + (z[2] << 128) + (z[3] << 192) in if x1 & (2^256-1) < 2^255 then x1 & (2^256-1) else (x1 & (2^256-1)) - 2^256
Functions
- The function fiat_secp256k1_montgomery_scalar_add adds two field elements in the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_addcarryx_u64 is an addition with carry.
- The function fiat_secp256k1_montgomery_scalar_cmovznz_u64 is a single-word conditional move.
- The function fiat_secp256k1_montgomery_scalar_divstep computes a divstep.
- The function fiat_secp256k1_montgomery_scalar_divstep_precomp returns the precomputed value for Bernstein-Yang-inversion (in montgomery form).
- The function fiat_secp256k1_montgomery_scalar_from_bytes deserializes a field element NOT in the Montgomery domain from bytes in little-endian order.
- The function fiat_secp256k1_montgomery_scalar_from_montgomery translates a field element out of the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_msat returns the saturated representation of the prime modulus.
- The function fiat_secp256k1_montgomery_scalar_mul multiplies two field elements in the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_mulx_u64 is a multiplication, returning the full double-width result.
- The function fiat_secp256k1_montgomery_scalar_nonzero outputs a single non-zero word if the input is non-zero and zero otherwise.
- The function fiat_secp256k1_montgomery_scalar_opp negates a field element in the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_selectznz is a multi-limb conditional select.
- The function fiat_secp256k1_montgomery_scalar_set_one returns the field element one in the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_square squares a field element in the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_sub subtracts two field elements in the Montgomery domain.
- The function fiat_secp256k1_montgomery_scalar_subborrowx_u64 is a subtraction with borrow.
- The function fiat_secp256k1_montgomery_scalar_to_bytes serializes a field element NOT in the Montgomery domain to bytes in little-endian order.
- The function fiat_secp256k1_montgomery_scalar_to_montgomery translates a field element into the Montgomery domain.