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59 lines
1.9 KiB
59 lines
1.9 KiB
1 year ago
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Math.Field
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{
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public abstract class FiniteFields
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{
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internal static readonly IFiniteField GF_2 = new PrimeField(BigInteger.ValueOf(2));
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internal static readonly IFiniteField GF_3 = new PrimeField(BigInteger.ValueOf(3));
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public static IPolynomialExtensionField GetBinaryExtensionField(int[] exponents)
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{
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if (exponents[0] != 0)
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{
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throw new ArgumentException("Irreducible polynomials in GF(2) must have constant term", "exponents");
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}
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for (int i = 1; i < exponents.Length; ++i)
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{
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if (exponents[i] <= exponents[i - 1])
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{
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throw new ArgumentException("Polynomial exponents must be monotonically increasing", "exponents");
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}
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}
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return new GenericPolynomialExtensionField(GF_2, new GF2Polynomial(exponents));
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}
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// public static IPolynomialExtensionField GetTernaryExtensionField(Term[] terms)
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// {
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// return new GenericPolynomialExtensionField(GF_3, new GF3Polynomial(terms));
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// }
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public static IFiniteField GetPrimeField(BigInteger characteristic)
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{
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int bitLength = characteristic.BitLength;
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if (characteristic.SignValue <= 0 || bitLength < 2)
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{
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throw new ArgumentException("Must be >= 2", "characteristic");
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}
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if (bitLength < 3)
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{
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switch (characteristic.IntValue)
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{
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case 2:
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return GF_2;
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case 3:
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return GF_3;
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}
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}
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return new PrimeField(characteristic);
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}
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}
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}
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#pragma warning restore
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#endif
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