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Add constant for bytes of (p-1)/2.

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Henry de Valence 2017-02-19 19:50:36 -05:00
parent 363ea405d4
commit 82041c2c67
1 changed files with 7 additions and 0 deletions
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7
src/constants.rs
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@ -36,6 +36,13 @@ pub const a_minus_d: FieldElement = FieldElement([
10913609, -13857413, 15372611, -6949391, -114729, 10913609, -13857413, 15372611, -6949391, -114729,
8787816, 6275908, 3247719, 18696448, 12055116, ]); 8787816, 6275908, 3247719, 18696448, 12055116, ]);
/// (p-1)/2, in little-endian bytes.
pub const HALF_P_MINUS_1_BYTES: [u8; 32] =
[0xf6, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f];
/// Precomputed value of one of the square roots of -1 (mod p) /// Precomputed value of one of the square roots of -1 (mod p)
pub const SQRT_M1: FieldElement = FieldElement([ pub const SQRT_M1: FieldElement = FieldElement([
-32595792, -7943725, 9377950, 3500415, 12389472, -32595792, -7943725, 9377950, 3500415, 12389472,