internal polish, minor refactors & manifest v3 progression

1 files changed, 58 insertions, 0 deletions

diff --git a/back-end/libs/NVault.Crypto.Secp256k1/src/Secp256k1SecretKey.cs b/back-end/libs/NVault.Crypto.Secp256k1/src/Secp256k1SecretKey.cs
new file mode 100644
index 0000000..7224720
--- /dev/null
+++ b/back-end/libs/NVault.Crypto.Secp256k1/src/Secp256k1SecretKey.cs
@@ -0,0 +1,58 @@
+// Copyright (C) 2023 Vaughn Nugent
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+using System;
+using System.Runtime.InteropServices;
+
+using VNLib.Utils.Memory;
+
+namespace NVault.Crypto.Secp256k1
+{
+    /// <summary>
+    /// Represents a Secp256k1 secret key, the size is fixed, and should use 
+    /// the sizeof() operator to get the size
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Size = 32)]
+    public unsafe struct Secp256k1SecretKey
+    {
+        private fixed byte data[32];
+
+        /// <summary>
+        /// Implict cast to a span of raw bytes
+        /// </summary>
+        /// <param name="key">The secret key to cast</param>
+        public static implicit operator Span<byte>(Secp256k1SecretKey key) => new(key.data, 32);
+
+        /// <summary>
+        /// Casts the secret key span to a <see cref="Secp256k1SecretKey"/> via a structure copy
+        /// </summary>
+        /// <param name="key">The key data to copy</param>
+        /// <exception cref="ArgumentOutOfRangeException"></exception>
+        public static explicit operator Secp256k1SecretKey(ReadOnlySpan<byte> key) => FromSpan(key);
+
+        /// <summary>
+        /// Creates a new <see cref="Secp256k1SecretKey"/> from a span of bytes
+        /// by copying the bytes into the struct
+        /// </summary>
+        /// <param name="span">The secret key data to copy</param>
+        /// <returns>An initilaized <see cref="Secp256k1SecretKey"/></returns>
+        public static Secp256k1SecretKey FromSpan(ReadOnlySpan<byte> span) 
+        {
+            Secp256k1SecretKey newKey = new();
+            MemoryUtil.CopyStruct(span, ref newKey);
+            return newKey;
+        }
+    }
+}
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