Initial Commit

2023-06-21 12:46:23 -04:00
commit c70248a520
1352 changed files with 336780 additions and 0 deletions
--- a/iTechSharp/srcbc/crypto/generators/ECKeyPairGenerator.cs
+++ b/iTechSharp/srcbc/crypto/generators/ECKeyPairGenerator.cs
@@ -0,0 +1,130 @@
+using System;
+using System.Globalization;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X9;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Math.EC;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Crypto.Generators
+{
+    public class ECKeyPairGenerator
+		: IAsymmetricCipherKeyPairGenerator
+    {
+		private readonly string algorithm;
+
+		private ECDomainParameters parameters;
+		private DerObjectIdentifier publicKeyParamSet;
+        private SecureRandom random;
+
+		public ECKeyPairGenerator()
+			: this("EC")
+		{
+		}
+
+		public ECKeyPairGenerator(
+			string algorithm)
+		{
+			if (algorithm == null)
+				throw new ArgumentNullException("algorithm");
+
+			this.algorithm = VerifyAlgorithmName(algorithm);
+		}
+
+		public void Init(
+            KeyGenerationParameters parameters)
+        {
+			if (parameters is ECKeyGenerationParameters)
+			{
+				ECKeyGenerationParameters ecP = (ECKeyGenerationParameters) parameters;
+
+				if (ecP.PublicKeyParamSet != null)
+				{
+					if (algorithm != "ECGOST3410")
+						throw new ArgumentException("parameters invalid for algorithm: " + algorithm, "parameters");
+
+					this.publicKeyParamSet = ecP.PublicKeyParamSet;
+				}
+
+				this.parameters = ecP.DomainParameters;
+			}
+			else
+			{
+				DerObjectIdentifier oid;
+				switch (parameters.Strength)
+				{
+					case 192:
+						oid = X9ObjectIdentifiers.Prime192v1;
+						break;
+					case 239:
+						oid = X9ObjectIdentifiers.Prime239v1;
+						break;
+					case 256:
+						oid = X9ObjectIdentifiers.Prime256v1;
+						break;
+					default:
+						throw new InvalidParameterException("unknown key size.");
+				}
+
+				X9ECParameters ecps = X962NamedCurves.GetByOid(oid);
+
+				this.parameters = new ECDomainParameters(
+					ecps.Curve, ecps.G, ecps.N, ecps.H, ecps.GetSeed());
+			}
+
+			this.random = parameters.Random;
+		}
+
+		/**
+         * Given the domain parameters this routine Generates an EC key
+         * pair in accordance with X9.62 section 5.2.1 pages 26, 27.
+         */
+        public AsymmetricCipherKeyPair GenerateKeyPair()
+        {
+            BigInteger n = parameters.N;
+            BigInteger d;
+
+            do
+            {
+                d = new BigInteger(n.BitLength, random);
+            }
+            while (d.SignValue == 0 || (d.CompareTo(n) >= 0));
+
+            ECPoint q = parameters.G.Multiply(d);
+
+			if (publicKeyParamSet != null)
+			{
+				return new AsymmetricCipherKeyPair(
+					new ECPublicKeyParameters(q, publicKeyParamSet),
+					new ECPrivateKeyParameters(d, publicKeyParamSet));
+			}
+
+			return new AsymmetricCipherKeyPair(
+				new ECPublicKeyParameters(algorithm, q, parameters),
+				new ECPrivateKeyParameters(algorithm, d, parameters));
+		}
+
+		private string VerifyAlgorithmName(
+			string algorithm)
+		{
+			string upper = algorithm.ToUpper(CultureInfo.InvariantCulture);
+
+			switch (upper)
+			{
+				case "EC":
+				case "ECDSA":
+				case "ECGOST3410":
+				case "ECDH":
+				case "ECDHC":
+					break;
+				default:
+					throw new ArgumentException("unrecognised algorithm: " + algorithm, "algorithm");
+			}
+
+			return upper;
+		}
+	}
+}