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//------------------------------------------------------------
// 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);
}
}
}
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