65 lines
2.3 KiB
C#
65 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Numerics;
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using System.Globalization;
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namespace Square {
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public static class NumericExtensions {
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public static byte[] Pack(this Single value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this Double value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this Int16 value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this UInt16 value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this Int32 value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this UInt32 value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this Int64 value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static byte[] Pack(this UInt64 value)
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=> BitConverter.GetBytes(value).HostToNetworkOrder();
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public static bool IsDivisibleBy(this BigInteger value, BigInteger dividend) {
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if(value.IsZero) return false;
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if(value.IsOne) return true;
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if(value == 2) return value.IsEven;
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return (value % dividend).IsZero;
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}
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public static bool IsProbablePrime(this BigInteger value, int iterations = 5) {
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var absValue = BigInteger.Abs(value);
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if(absValue == 1) return false;
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if(absValue == 2 || absValue == 3 || absValue == 5) return true;
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if(absValue.IsEven || absValue.IsDivisibleBy(3) || absValue.IsDivisibleBy(5)) return false;
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if(absValue < 25) return true;
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for(var i = 0; i < iterations; ++i) {
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var rand = RNG.NextBigInt(2, absValue - 2);
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if(!BigInteger.ModPow(rand, absValue - 1, absValue).IsOne) return false;
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}
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return true;
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}
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public static string ToHexString(this BigInteger value)
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=> value.ToString("X").ToLower();
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public static BigInteger HexStringToBigInt(this string value)
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=> BigInteger.Parse(value, NumberStyles.HexNumber);
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}
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}
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