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math.big: rework function naming and documentation (#18890)

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phoebe
2023-07-20 01:33:07 +02:00
committed by GitHub
parent bd3501affa
commit a49b8f28b1
10 changed files with 178 additions and 116 deletions
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8
vlib/math/big/exponentiation.v
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@@ -29,8 +29,8 @@ fn (m Integer) montgomery() MontgomeryContext {
// ri := multiplicative inverse of r in the ring Z/nZ
// ri * r == 1 (mod n)
// ni = ((ri * 2^(log_2(n))) - 1) / n
ni: (one_int.lshift(b).mod_inv(n).lshift(b) - one_int) / n
rr: one_int.lshift(b * 2) % n
ni: (one_int.left_shift(b).mod_inv(n).left_shift(b) - one_int) / n
rr: one_int.left_shift(b * 2) % n
}
}
@@ -164,7 +164,7 @@ fn (a Integer) mont_even(x Integer, m Integer) Integer {
}
m1, j := m.rsh_to_set_bit()
m2 := one_int.lshift(j)
m2 := one_int.left_shift(j)
$if debug {
assert m1 * m2 == m
@@ -321,7 +321,7 @@ fn (a Integer) to_mont(ctx MontgomeryContext) Integer {
fn (a Integer) from_mont(ctx MontgomeryContext) Integer {
log2n := u32(ctx.n.bit_len())
r := (a + ((a.mask_bits(log2n) * ctx.ni).mask_bits(log2n) * ctx.n)).rshift(log2n)
r := (a + ((a.mask_bits(log2n) * ctx.ni).mask_bits(log2n) * ctx.n)).right_shift(log2n)
return if r.abs_cmp(ctx.n) >= 0 {
r - ctx.n