74 lines
2.7 KiB
C#
74 lines
2.7 KiB
C#
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//-----------------------------------------------------------------------
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// <copyright file="Entropy.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//-----------------------------------------------------------------------
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namespace System.IdentityModel.Protocols.WSTrust
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{
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using System.IdentityModel.Tokens;
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/// <summary>
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/// The Entropy used in both token request message and token response message.
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/// </summary>
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public class Entropy : ProtectedKey
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{
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/// <summary>
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/// Use this constructor to create an Entropy object with some randomly generated bytes.
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/// </summary>
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/// <param name="entropySizeInBits">The entropySizeInBits of the key material inside the entropy.</param>
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public Entropy( int entropySizeInBits )
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: this( CryptoHelper.GenerateRandomBytes( entropySizeInBits ) )
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{
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}
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/// <summary>
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/// Constructor for sending entropy in binary secret format.
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/// </summary>
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/// <param name="secret">The key material.</param>
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public Entropy( byte[] secret )
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: base( secret )
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{
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}
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/// <summary>
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/// Constructor for sending entropy in encrypted key format.
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/// </summary>
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/// <param name="secret">The key material.</param>
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/// <param name="wrappingCredentials">The encrypting credentials used to encrypt the key material.</param>
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public Entropy( byte[] secret, EncryptingCredentials wrappingCredentials )
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: base( secret, wrappingCredentials )
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{
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}
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/// <summary>
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/// Constructs an entropy instance with the protected key.
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/// </summary>
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/// <param name="protectedKey">The protected key which can be either binary secret or encrypted key.</param>
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public Entropy( ProtectedKey protectedKey )
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: base( GetKeyBytesFromProtectedKey( protectedKey ), GetWrappingCredentialsFromProtectedKey( protectedKey ) )
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{
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}
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static byte[] GetKeyBytesFromProtectedKey( ProtectedKey protectedKey )
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{
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if ( protectedKey == null )
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull( "protectedKey" );
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}
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return protectedKey.GetKeyBytes();
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}
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static EncryptingCredentials GetWrappingCredentialsFromProtectedKey( ProtectedKey protectedKey )
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{
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if ( protectedKey == null )
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull( "protectedKey" );
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}
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return protectedKey.WrappingCredentials;
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}
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}
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}
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