OpenSsl library: Added helper functions for easy instantiation of CryptoGroup.

Author: lumip

CompactCryptoGroupAlgebra.OpenSsl.Tests/EllipticCurveAlgebraTests.cs

@@ -279,6 +279,13 @@ public void TestGetHashCodeSameForEqual()
             Assert.That(algebra.GetHashCode() == otherAlgebra.GetHashCode());
         }
 
+        [Test]
+        public void TestCreateCryptoGroup()
+        {
+            var expectedGroupAlgebra = new EllipticCurveAlgebra(EllipticCurveID.Prime256v1);
+            var group = EllipticCurveAlgebra.CreateCryptoGroup(EllipticCurveID.Prime256v1);
+            Assert.That(group.Algebra.Equals(expectedGroupAlgebra));
+        }
 
     }
 

CompactCryptoGroupAlgebra.OpenSsl.Tests/MultiplicativeGroupAlgebraTests.cs

@@ -267,5 +267,17 @@ public void TestDispose()
             Assert.DoesNotThrow(algebra.Dispose);
         }
 
+        [Test]
+        public void TestCreateCryptoGroup()
+        {
+            var group = MultiplicativeGroupAlgebra.CreateCryptoGroup(
+                prime, order, generator
+            );
+            var expectedGroupAlgebra = new MultiplicativeGroupAlgebra(
+                prime, order, generator
+            );
+            Assert.That(group.Algebra.Equals(expectedGroupAlgebra));
+        }
+
     }
 }

CompactCryptoGroupAlgebra.OpenSsl/EllipticCurveAlgebra.cs

@@ -279,6 +279,16 @@ public override int GetHashCode()
             return hashCode;
         }
 
+        /// <summary>
+        /// Creates a <see cref="CryptoGroup{SecureBigNumber, ECPoint}" /> instance using a <see cref="EllipticCurveAlgebra" />
+        /// for the given curve identifier.
+        /// </summary>
+        /// <param name="curveId">Identifier of the elliptic curve.</param>
+        public static CryptoGroup<SecureBigNumber, ECPoint> CreateCryptoGroup(EllipticCurveID curveId)
+        {
+            return new CryptoGroup<SecureBigNumber, ECPoint>(new EllipticCurveAlgebra(curveId));
+        }
+
     }
 
 }

CompactCryptoGroupAlgebra.OpenSsl/MultiplicativeGroupAlgebra.cs

@@ -174,6 +174,22 @@ public override int GetHashCode()
             return hashCode;
         }
 
+        /// <summary>
+        /// Creates a <see cref="CryptoGroup{SecureBigNumber, BigNumber}" /> instance using a <see cref="MultiplicativeGroupAlgebra" />
+        /// instance with the given parameters.
+        /// </summary>
+        /// <param name="prime">The prime modulo of the group.</param>
+        /// <param name="order">The order of the group</param>
+        /// <param name="generator">The generator of the group.</param>
+        public static CryptoGroup<SecureBigNumber, BigNumber> CreateCryptoGroup(
+            BigPrime prime, BigPrime order, BigInteger generator
+        )
+        {
+            return new CryptoGroup<SecureBigNumber, BigNumber>(new MultiplicativeGroupAlgebra(
+                prime, order, generator
+            ));
+        }
+
     }
 
 }