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clean up reduction test

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Henry de Valence 2017-11-22 16:22:16 -08:00
parent d32fe9772b
commit 34639725d4
1 changed files with 13 additions and 12 deletions
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25
src/scalar.rs
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@ -621,6 +621,18 @@ mod test {
], ],
}; };
/// sage: l = 2^252 + 27742317777372353535851937790883648493
/// sage: big = 2^256 - 1
/// sage: repr((big % l).digits(256))
static CANONICAL_2_256_MINUS_1: Scalar = Scalar{
bytes: [
28, 149, 152, 141, 116, 49, 236, 214,
112, 207, 125, 115, 244, 91, 239, 198,
254, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 15,
],
};
static A_SCALAR: Scalar = Scalar{ static A_SCALAR: Scalar = Scalar{
bytes: [ bytes: [
0x1a, 0x0e, 0x97, 0x8a, 0x90, 0xf6, 0x62, 0x2d, 0x1a, 0x0e, 0x97, 0x8a, 0x90, 0xf6, 0x62, 0x2d,
@ -743,18 +755,7 @@ mod test {
#[test] #[test]
fn reduce() { fn reduce() {
let biggest = Scalar::from_bytes_mod_order([0xff; 32]); let biggest = Scalar::from_bytes_mod_order([0xff; 32]);
// sage: l = 2^252 + 27742317777372353535851937790883648493 assert_eq!(biggest, CANONICAL_2_256_MINUS_1);
// sage: big = 2^256 - 1
// sage: repr((big % l).digits(256))
let biggest_mod_l = Scalar{
bytes: [
28, 149, 152, 141, 116, 49, 236, 214,
112, 207, 125, 115, 244, 91, 239, 198,
254, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 15,
],
};
assert_eq!(biggest, biggest_mod_l);
} }
#[test] #[test]