refactor(DigitalData.Core.Security): Umbenennung des Unternamensraums von Cryptographer in RSAKey

DigitalData.Core.Security/RSAKey/RSAPrivateKey.cs

@@ -0,0 +1,66 @@
+using DigitalData.Core.Abstractions.Security;
+using Microsoft.IdentityModel.Tokens;
+using System.Security.Cryptography;
+
+namespace DigitalData.Core.Security.RSAKey
+{
+    public class RSAPrivateKey : RSAKeyBase, IAsymmetricPrivateKey, IAsymmetricKey
+    {
+        private string? _pem;
+
+        public override string Pem
+        {
+#pragma warning disable CS8603 // Possible null reference return.
+            get => _pem;
+#pragma warning restore CS8603 // Possible null reference return.
+            init
+            {
+                _pem = value;
+                Init();
+            }
+        }
+
+        public bool IsPemNull => _pem is null;
+
+        public bool IsEncrypted { get; init; }
+
+        private readonly Lazy<IAsymmetricPublicKey> _lazyPublicKey;
+
+        public IAsymmetricPublicKey PublicKey => _lazyPublicKey.Value;
+
+        public RSAPrivateKey()
+        {
+            _lazyPublicKey = new(() => new RSAPublicKey()
+            {
+                Pem = RSA.ExportRSAPublicKeyPem(),
+                Padding = Padding
+            });
+        }
+
+        public byte[] Decrypt(byte[] data) => RSA.Decrypt(data, Padding);
+
+        public string Decrypt(string data) => RSA.Decrypt(data.Base64ToByte(), Padding).BytesToString();
+
+        internal void SetPem(string pem)
+        {
+            _pem = pem;
+            Init();
+        }
+
+        private void Init()
+        {
+            if (string.IsNullOrEmpty(_pem))
+                throw PemIsNullException;
+
+            if (IsEncrypted)
+                RSA.ImportFromEncryptedPem(Pem, Secrets.PBE_PASSWORD.AsSpan());
+            else
+                RSA.ImportFromPem(Pem);
+        }
+
+        private InvalidOperationException PemIsNullException => new($"Pem is null or empty. Issuer: {Issuer}, Audience: {Audience}.");
+
+        public SigningCredentials CreateSigningCredentials(string algorithm = SecurityAlgorithms.RsaSha256, string? digest = null)
+            => digest is null ? new(RsaSecurityKey, algorithm) : new(RsaSecurityKey, algorithm, digest);
+    }
+}