Auto type init, async/lazy loading

1 files changed, 115 insertions, 0 deletions

diff --git a/lib/VNLib.Plugins.Extensions.Loading/src/Secrets/PrivateKey.cs b/lib/VNLib.Plugins.Extensions.Loading/src/Secrets/PrivateKey.cs
new file mode 100644
index 0000000..08637cd
--- /dev/null
+++ b/lib/VNLib.Plugins.Extensions.Loading/src/Secrets/PrivateKey.cs
@@ -0,0 +1,115 @@
+/*
+* Copyright (c) 2023 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Plugins.Extensions.Loading
+* File: PrivateKey.cs 
+*
+* PrivateKey.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Plugins.Extensions.Loading 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.
+*
+* VNLib.Plugins.Extensions.Loading 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.Text;
+using System.Security.Cryptography;
+
+using VNLib.Utils;
+using VNLib.Utils.Memory;
+using VNLib.Utils.Extensions;
+
+namespace VNLib.Plugins.Extensions.Loading
+{
+    /// <summary>
+    /// A container for a PKSC#8 encoed private key
+    /// </summary>
+    public sealed class PrivateKey : VnDisposeable
+    {
+        private readonly byte[] _utf8RawData;
+        
+        /// <summary>
+        /// Decodes the PKCS#8 encoded private key from a secret, as an EC private key
+        /// and recovers the ECDsa algorithm from the key
+        /// </summary>
+        /// <returns>The <see cref="ECDsa"/> algoritm from the private key</returns>
+        /// <exception cref="ArgumentNullException"></exception>
+        /// <exception cref="CryptographicException"></exception>
+        public ECDsa GetECDsa()
+        {
+            //Alloc buffer
+            using IMemoryHandle<byte> buffer = MemoryUtil.SafeAlloc<byte>(_utf8RawData.Length);
+
+            //Get base64 bytes from utf8
+            ERRNO count = VnEncoding.Base64UrlDecode(_utf8RawData, buffer.Span);
+            
+            //Parse the private key
+            ECDsa alg = ECDsa.Create();
+            
+            alg.ImportPkcs8PrivateKey(buffer.Span[..(int)count], out _);
+            
+            //Wipe the buffer
+            MemoryUtil.InitializeBlock(buffer.Span);
+            
+            return alg;
+        }
+
+        /// <summary>
+        /// Decodes the PKCS#8 encoded private key from a secret, as an RSA private key
+        /// </summary>
+        /// <returns>The <see cref="RSA"/> algorithm from the private key</returns>
+        /// <exception cref="ArgumentNullException"></exception>
+        /// <exception cref="CryptographicException"></exception>
+        public RSA GetRSA()
+        {
+            //Alloc buffer
+            using IMemoryHandle<byte> buffer = MemoryUtil.SafeAlloc<byte>(_utf8RawData.Length);
+            
+            //Get base64 bytes from utf8
+            ERRNO count = VnEncoding.Base64UrlDecode(_utf8RawData, buffer.Span);
+
+            //Parse the private key
+            RSA alg = RSA.Create();
+            
+            alg.ImportPkcs8PrivateKey(buffer.Span[..(int)count], out _);
+            
+            //Wipe the buffer
+            MemoryUtil.InitializeBlock(buffer.Span);
+            
+            return alg;
+        }
+
+        internal PrivateKey(ISecretResult secret)
+        {
+            //Alloc and get utf8
+            byte[] buffer = new byte[secret.Result.Length];
+            
+            int count = Encoding.UTF8.GetBytes(secret.Result, buffer);
+
+            //Verify length
+            if(count != buffer.Length)
+            {
+                throw new FormatException("UTF8 deocde failed");
+            }
+            
+            //Store
+            _utf8RawData = buffer;
+        }
+
+        protected override void Free()
+        {
+            MemoryUtil.InitializeBlock(_utf8RawData.AsSpan());
+        }
+    }
+}