Fixed incorrect encodings. (#50)

Author: MrMatthewLayton

OnixLabs.Security.Cryptography.UnitTests/HashAlgorithmExtensionTests.cs

@@ -42,7 +42,7 @@ public async void HashAlgorithmComputeHashAsyncShouldProduceExpectedResultWithTw
     {
         // Given
         using HashAlgorithm algorithm = SHA256.Create();
-        Stream data = new MemoryStream(Encoding.Default.GetBytes("abc123"));
+        Stream data = new MemoryStream("abc123"u8.ToArray());
         const string expected = "efaaeb3b1d1d85e8587ef0527ca43b9575ce8149ba1ee41583d3d19bd130daf8";
 
         // When

OnixLabs.Security.Cryptography/Extensions.HashAlgorithm.cs

@@ -60,7 +60,7 @@ public static byte[] ComputeHash(this HashAlgorithm algorithm, byte[] data, int
     /// <param name="rounds">The number of rounds that the input data should be hashed.</param>
     /// <returns>Returns the computed hash value.</returns>
     public static byte[] ComputeHash(this HashAlgorithm algorithm, ReadOnlySpan<char> data, Encoding? encoding = null, int rounds = 1) =>
-        algorithm.ComputeHash((encoding ?? Encoding.Default).GetBytes(data.ToArray()), rounds);
+        algorithm.ComputeHash((encoding ?? Encoding.UTF8).GetBytes(data.ToArray()), rounds);
 
     /// <summary>
     /// Computes the hash value for the specified <see cref="Stream"/> object.