Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Security / Cryptography / ECDiffieHellmanCngPublicKey.cs / 1305376 / ECDiffieHellmanCngPublicKey.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; using System.Runtime.Serialization; using System.Security; using System.Security.Permissions; using System.Diagnostics.Contracts; namespace System.Security.Cryptography { ////// Public key used to do key exchange with the ECDiffieHellmanCng algorithm /// [Serializable] [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] public sealed class ECDiffieHellmanCngPublicKey : ECDiffieHellmanPublicKey { [NonSerialized] private CngKey m_key; private CngKeyBlobFormat m_format; ////// Wrap a CNG key /// //// [System.Security.SecurityCritical] internal ECDiffieHellmanCngPublicKey(CngKey key) : base(key.Export(CngKeyBlobFormat.EccPublicBlob)) { Contract.Requires(key != null && key.AlgorithmGroup == CngAlgorithmGroup.ECDiffieHellman); Contract.Ensures(m_format != null); m_format = CngKeyBlobFormat.EccPublicBlob; // // We need to make a copy of the key to prevent the situation where the ECDiffieHellmanCng algorithm // object is disposed (this disposing its key) before the ECDiffieHellmanCngPublic key is disposed. // // Accessing the handle in partial trust is safe because we're not exposing it back out to user code // new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); m_key = CngKey.Open(key.Handle, key.IsEphemeral ? CngKeyHandleOpenOptions.EphemeralKey : CngKeyHandleOpenOptions.None); CodeAccessPermission.RevertAssert(); } ///// /// Format the key blob is expressed in /// public CngKeyBlobFormat BlobFormat { get { Contract.Ensures(Contract.Result() != null); Contract.Assert(m_format != null); return m_format; } } /// /// Clean up the key /// protected override void Dispose(bool disposing) { try { if (disposing) { if (m_key != null) { m_key.Dispose(); } } } finally { base.Dispose(disposing); } } ////// Hydrate a public key from a blob /// //// [System.Security.SecurityCritical] public static ECDiffieHellmanPublicKey FromByteArray(byte[] publicKeyBlob, CngKeyBlobFormat format) { if (publicKeyBlob == null) { throw new ArgumentNullException("publicKeyBlob"); } if (format == null) { throw new ArgumentNullException("format"); } using (CngKey imported = CngKey.Import(publicKeyBlob, format)) { if (imported.AlgorithmGroup != CngAlgorithmGroup.ECDiffieHellman) { throw new ArgumentException(SR.GetString(SR.Cryptography_ArgECDHRequiresECDHKey)); } return new ECDiffieHellmanCngPublicKey(imported); } } ///// /// Hydrate a public key from XML /// /// See code:System.Security.Cryptography.Rfc4050KeyFormatter#RFC4050ECKeyFormat for information /// about the XML format used. /// //// [System.Security.SecurityCritical] public static ECDiffieHellmanCngPublicKey FromXmlString(string xml) { if (xml == null) { throw new ArgumentNullException("xml"); } using (CngKey imported = Rfc4050KeyFormatter.FromXml(xml)) { if (imported.AlgorithmGroup != CngAlgorithmGroup.ECDiffieHellman) { throw new ArgumentException(SR.GetString(SR.Cryptography_ArgECDHRequiresECDHKey), "xml"); } return new ECDiffieHellmanCngPublicKey(imported); } } ///// /// Import the public key into CNG /// ///public CngKey Import() { Contract.Ensures(Contract.Result () != null); Contract.Assert(m_format != null); return CngKey.Import(ToByteArray(), BlobFormat); } /// /// Convert the key blob to XML /// /// See code:System.Security.Cryptography.Rfc4050KeyFormatter#RFC4050ECKeyFormat for information /// about the XML format used. /// public override string ToXmlString() { Contract.Ensures(!String.IsNullOrEmpty(Contract.Result())); if (m_key == null) { m_key = Import(); } return Rfc4050KeyFormatter.ToXml(m_key); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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