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optimized PQFactorize

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Wizou 2022-10-16 11:49:16 +02:00
parent d18b3853e1
commit 82d852e071
1 changed files with 15 additions and 42 deletions
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57
src/Helpers.cs
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@ -86,7 +86,7 @@ namespace WTelegram
return result;
}
internal static ulong PQFactorize(ulong pq) // ported from https://github.com/tdlib/td/blob/master/tdutils/td/utils/crypto.cpp#L90
internal static ulong PQFactorize(ulong pq) // ported from https://github.com/tdlib/td/blob/master/tdutils/td/utils/crypto.cpp#L103
{
if (pq < 2) return 1;
var random = new Random();
@ -100,26 +100,16 @@ namespace WTelegram
for (int j = 1; j < lim; j++)
{
iter++;
ulong a = x;
ulong b = x;
ulong c = q;
// c += a * b
while (b != 0)
// x = (q + x * x) % pq
ulong res = q, a = x;
while (x != 0)
{
if ((b & 1) != 0)
{
c += a;
if (c >= pq)
c -= pq;
}
a += a;
if (a >= pq)
a -= pq;
b >>= 1;
if ((x & 1) != 0)
res = (res + a) % pq;
a = (a + a) % pq;
x >>= 1;
}
x = c;
x = res;
ulong z = x < y ? pq + x - y : x - y;
g = gcd(z, pq);
if (g != 1)
@ -139,32 +129,15 @@ namespace WTelegram
}
return g;
static ulong gcd(ulong a, ulong b)
static ulong gcd(ulong left, ulong right)
{
if (a == 0) return b;
if (b == 0) return a;
int shift = 0;
while ((a & 1) == 0 && (b & 1) == 0)
while (right != 0)
{
a >>= 1;
b >>= 1;
shift++;
}
while (true)
{
while ((a & 1) == 0)
a >>= 1;
while ((b & 1) == 0)
b >>= 1;
if (a > b)
a -= b;
else if (b > a)
b -= a;
else
return a << shift;
ulong num = left % right;
left = right;
right = num;
}
return left;
}
}