#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR) using System; using Org.BouncyCastle.Math; using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Crypto.Parameters { public class DHParameters : ICipherParameters { private const int DefaultMinimumLength = 160; private readonly BigInteger p, g, q, j; private readonly int m, l; private readonly DHValidationParameters validation; private static int GetDefaultMParam( int lParam) { if (lParam == 0) return DefaultMinimumLength; return System.Math.Min(lParam, DefaultMinimumLength); } public DHParameters( BigInteger p, BigInteger g) : this(p, g, null, 0) { } public DHParameters( BigInteger p, BigInteger g, BigInteger q) : this(p, g, q, 0) { } public DHParameters( BigInteger p, BigInteger g, BigInteger q, int l) : this(p, g, q, GetDefaultMParam(l), l, null, null) { } public DHParameters( BigInteger p, BigInteger g, BigInteger q, int m, int l) : this(p, g, q, m, l, null, null) { } public DHParameters( BigInteger p, BigInteger g, BigInteger q, BigInteger j, DHValidationParameters validation) : this(p, g, q, DefaultMinimumLength, 0, j, validation) { } public DHParameters( BigInteger p, BigInteger g, BigInteger q, int m, int l, BigInteger j, DHValidationParameters validation) { if (p == null) throw new ArgumentNullException("p"); if (g == null) throw new ArgumentNullException("g"); if (!p.TestBit(0)) throw new ArgumentException("field must be an odd prime", "p"); if (g.CompareTo(BigInteger.Two) < 0 || g.CompareTo(p.Subtract(BigInteger.Two)) > 0) throw new ArgumentException("generator must in the range [2, p - 2]", "g"); if (q != null && q.BitLength >= p.BitLength) throw new ArgumentException("q too big to be a factor of (p-1)", "q"); if (m >= p.BitLength) throw new ArgumentException("m value must be < bitlength of p", "m"); if (l != 0) { // TODO Check this against the Java version, which has 'l > p.BitLength' here if (l >= p.BitLength) throw new ArgumentException("when l value specified, it must be less than bitlength(p)", "l"); if (l < m) throw new ArgumentException("when l value specified, it may not be less than m value", "l"); } if (j != null && j.CompareTo(BigInteger.Two) < 0) throw new ArgumentException("subgroup factor must be >= 2", "j"); // TODO If q, j both provided, validate p = jq + 1 ? this.p = p; this.g = g; this.q = q; this.m = m; this.l = l; this.j = j; this.validation = validation; } public BigInteger P { get { return p; } } public BigInteger G { get { return g; } } public BigInteger Q { get { return q; } } public BigInteger J { get { return j; } } /// The minimum bitlength of the private value. public int M { get { return m; } } /// The bitlength of the private value. public int L { get { return l; } } public DHValidationParameters ValidationParameters { get { return validation; } } public override bool Equals( object obj) { if (obj == this) return true; DHParameters other = obj as DHParameters; if (other == null) return false; return Equals(other); } protected virtual bool Equals( DHParameters other) { return p.Equals(other.p) && g.Equals(other.g) && Org.BouncyCastle.Utilities.Platform.Equals(q, other.q); } public override int GetHashCode() { int hc = p.GetHashCode() ^ g.GetHashCode(); if (q != null) { hc ^= q.GetHashCode(); } return hc; } } } #endif