Initial implementation of Argon2 (ported from bc-java)

crypto/src/crypto/ICharToByteConverter.cs

@@ -0,0 +1,35 @@
+namespace Org.BouncyCastle.Crypto
+{
+    public interface ICharToByteConverter
+    {
+        /**
+         * Return the type of the conversion.
+         *
+         * @return a type name for the conversion.
+         */
+        string GetName();
+
+        /**
+         * Return a byte encoded representation of the passed in password.
+         *
+         * @param password the characters to encode.
+         * @return a byte encoding of password.
+         */
+        byte[] Convert(char[] password);
+    }
+
+    public static class CharToByteConverterExtensions
+    {
+
+        /**
+         * Return a byte encoded representation of the passed in password.
+         *
+         * @param password the string to encode.
+         * @return a byte encoding of password.
+         */
+        public static byte[] Convert(this ICharToByteConverter converter, string password)
+        {
+            return converter.Convert(password.ToCharArray());
+        }
+    }
+}

crypto/src/crypto/PasswordConverter.cs

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+using System;
+using System.Text;
+
+namespace Org.BouncyCastle.Crypto
+{
+    public class PasswordConverter
+        : ICharToByteConverter
+    {
+        private readonly string name;
+        private readonly Func<char[], byte[]> converterFunction;
+
+        public PasswordConverter(string name, Func<char[], byte[]> converterFunction)
+        {
+            this.name = name;
+            this.converterFunction = converterFunction;
+        }
+
+        public byte[] Convert(char[] password)
+        {
+            return converterFunction.Invoke(password);
+        }
+
+        public string GetName()
+        {
+            return name;
+        }
+
+        public readonly static ICharToByteConverter ASCII = new PasswordConverter("ASCII", PbeParametersGenerator.Pkcs5PasswordToBytes);
+
+        public readonly static ICharToByteConverter UTF8 = new PasswordConverter("UTF8", PbeParametersGenerator.Pkcs5PasswordToUtf8Bytes);
+
+        public readonly static ICharToByteConverter PKCS12 = new PasswordConverter("PKCS12", PbeParametersGenerator.Pkcs12PasswordToBytes);
+
+        public readonly static ICharToByteConverter UTF32 = new PasswordConverter("UTF32", Encoding.UTF32.GetBytes);
+
+        public readonly static ICharToByteConverter Unicode = new PasswordConverter("Unicode", Encoding.Unicode.GetBytes);
+
+        public readonly static ICharToByteConverter BigEndianUnicode = new PasswordConverter("BigEndianUnicode", Encoding.BigEndianUnicode.GetBytes);
+
+#if NET6_0_OR_GREATER
+        public readonly static ICharToByteConverter Latin1 = new PasswordConverter("Latin1", Encoding.Latin1.GetBytes);
+#endif
+    }
+}