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Make MillerRabinIterations configurable for slow devices

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Wizou 2021-08-20 02:33:43 +02:00
parent f2a1dbc20d
commit d61234cabc
1 changed files with 6 additions and 2 deletions
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8
src/Helpers.cs
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@ -146,8 +146,10 @@ namespace WTelegram
} }
} }
public static int MillerRabinIterations { get; set; } = 64; // 64 is OpenSSL default for 2048-bits numbers
// Miller–Rabin primality test // Miller–Rabin primality test
public static bool IsProbablePrime(this BigInteger n, int k = 64) public static bool IsProbablePrime(this BigInteger n)
{ {
var n_minus_one = n - BigInteger.One; var n_minus_one = n - BigInteger.One;
if (n_minus_one.Sign <= 0) return false; if (n_minus_one.Sign <= 0) return false;
@ -160,7 +162,9 @@ namespace WTelegram
var randomBytes = new byte[bitLen / 8 + 1]; var randomBytes = new byte[bitLen / 8 + 1];
var lastByteMask = (byte)((1 << (int)(bitLen % 8)) - 1); var lastByteMask = (byte)((1 << (int)(bitLen % 8)) - 1);
BigInteger a; BigInteger a;
for (int i = 0; i < k; i++) if (MillerRabinIterations < 15) // 15 is the minimum recommended by Telegram
Log(3, $"MillerRabinIterations ({MillerRabinIterations}) is below the minimal level of safety (15)");
for (int i = 0; i < MillerRabinIterations; i++)
{ {
do do
{ {