Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.IdentityModel/System/IdentityModel/Tokens/SymmetricKey.cs

@@ -0,0 +1,112 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.IdentityModel.Tokens
+{
+    using System.IdentityModel.Selectors;
+    using System.Security.Cryptography;
+
+    public class InMemorySymmetricSecurityKey : SymmetricSecurityKey
+    {
+        int keySize;
+        byte[] symmetricKey;
+
+        public InMemorySymmetricSecurityKey(byte[] symmetricKey)
+            : this(symmetricKey, true)
+        {
+        }
+
+        public InMemorySymmetricSecurityKey(byte[] symmetricKey, bool cloneBuffer)
+        {
+            if (symmetricKey == null)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("symmetricKey"));
+            }
+
+            if (symmetricKey.Length == 0)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.SymmetricKeyLengthTooShort, symmetricKey.Length)));
+            }
+            this.keySize = symmetricKey.Length * 8;
+
+            if (cloneBuffer)
+            {
+                this.symmetricKey = new byte[symmetricKey.Length];
+                Buffer.BlockCopy(symmetricKey, 0, this.symmetricKey, 0, symmetricKey.Length);
+            }
+            else
+            {
+                this.symmetricKey = symmetricKey;
+            }
+        }
+
+        public override int KeySize
+        {
+            get { return this.keySize; }
+        }
+
+        public override byte[] DecryptKey(string algorithm, byte[] keyData)
+        {
+            return CryptoHelper.UnwrapKey(this.symmetricKey, keyData, algorithm);
+        }
+
+        public override byte[] EncryptKey(string algorithm, byte[] keyData)
+        {
+            return CryptoHelper.WrapKey(this.symmetricKey, keyData, algorithm);
+        }
+
+        public override byte[] GenerateDerivedKey(string algorithm, byte[] label, byte[] nonce, int derivedKeyLength, int offset)
+        {
+            return CryptoHelper.GenerateDerivedKey(this.symmetricKey, algorithm, label, nonce, derivedKeyLength, offset);
+        }
+
+        public override ICryptoTransform GetDecryptionTransform(string algorithm, byte[] iv)
+        {
+            return CryptoHelper.CreateDecryptor(this.symmetricKey, iv, algorithm);
+        }
+
+        public override ICryptoTransform GetEncryptionTransform(string algorithm, byte[] iv)
+        {
+            return CryptoHelper.CreateEncryptor(this.symmetricKey, iv, algorithm);
+        }
+
+        public override int GetIVSize(string algorithm)
+        {
+            return CryptoHelper.GetIVSize(algorithm);
+        }
+
+        public override KeyedHashAlgorithm GetKeyedHashAlgorithm(string algorithm)
+        {
+            return CryptoHelper.CreateKeyedHashAlgorithm(this.symmetricKey, algorithm);
+        }
+
+        public override SymmetricAlgorithm GetSymmetricAlgorithm(string algorithm)
+        {
+            return CryptoHelper.GetSymmetricAlgorithm(this.symmetricKey, algorithm);
+        }
+
+        public override byte[] GetSymmetricKey()
+        {
+            byte[] local = new byte[this.symmetricKey.Length];
+            Buffer.BlockCopy(this.symmetricKey, 0, local, 0, this.symmetricKey.Length);
+
+            return local;
+        }
+
+        public override bool IsAsymmetricAlgorithm(string algorithm)
+        {
+            return (CryptoHelper.IsAsymmetricAlgorithm(algorithm));
+        }
+
+        public override bool IsSupportedAlgorithm(string algorithm)
+        {
+            return (CryptoHelper.IsSymmetricSupportedAlgorithm(algorithm, this.KeySize));
+        }
+
+        public override bool IsSymmetricAlgorithm(string algorithm)
+        {
+            return CryptoHelper.IsSymmetricAlgorithm(algorithm);
+        }
+    }
+}