Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Security / Cryptography / CngAlgorithm.cs / 1305376 / CngAlgorithm.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; using System.Diagnostics.Contracts; namespace System.Security.Cryptography { ////// Utility class to strongly type algorithms used with CNG. Since all CNG APIs which require an /// algorithm name take the name as a string, we use this string wrapper class to specifically mark /// which parameters are expected to be algorithms. We also provide a list of well known algorithm /// names, which helps Intellisense users find a set of good algorithm names to use. /// [Serializable] [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] public sealed class CngAlgorithm : IEquatable{ private static CngAlgorithm s_ecdhp256; private static CngAlgorithm s_ecdhp384; private static CngAlgorithm s_ecdhp521; private static CngAlgorithm s_ecdsap256; private static CngAlgorithm s_ecdsap384; private static CngAlgorithm s_ecdsap521; private static CngAlgorithm s_md5; private static CngAlgorithm s_sha1; private static CngAlgorithm s_sha256; private static CngAlgorithm s_sha384; private static CngAlgorithm s_sha512; private string m_algorithm; public CngAlgorithm(string algorithm) { Contract.Ensures(!String.IsNullOrEmpty(m_algorithm)); if (algorithm == null) { throw new ArgumentNullException("algorithm"); } if (algorithm.Length == 0) { throw new ArgumentException(SR.GetString(SR.Cryptography_InvalidAlgorithmName, algorithm), "algorithm"); } m_algorithm = algorithm; } /// /// Name of the algorithm /// public string Algorithm { get { Contract.Ensures(!String.IsNullOrEmpty(Contract.Result())); return m_algorithm; } } public static bool operator==(CngAlgorithm left, CngAlgorithm right) { if (Object.ReferenceEquals(left, null)) { return Object.ReferenceEquals(right, null); } return left.Equals(right); } [Pure] public static bool operator !=(CngAlgorithm left, CngAlgorithm right) { if (Object.ReferenceEquals(left, null)) { return !Object.ReferenceEquals(right, null); } return !left.Equals(right); } public override bool Equals(object obj) { Contract.Assert(m_algorithm != null); return Equals(obj as CngAlgorithm); } public bool Equals(CngAlgorithm other) { if (Object.ReferenceEquals(other, null)) { return false; } return m_algorithm.Equals(other.Algorithm); } public override int GetHashCode() { Contract.Assert(m_algorithm != null); return m_algorithm.GetHashCode(); } public override string ToString() { Contract.Assert(m_algorithm != null); return m_algorithm; } // // Well known algorithms // public static CngAlgorithm ECDiffieHellmanP256 { get { Contract.Ensures(Contract.Result () != null); if (s_ecdhp256 == null) { s_ecdhp256 = new CngAlgorithm(BCryptNative.AlgorithmName.ECDHP256); } return s_ecdhp256; } } public static CngAlgorithm ECDiffieHellmanP384 { get { Contract.Ensures(Contract.Result () != null); if (s_ecdhp384 == null) { s_ecdhp384 = new CngAlgorithm(BCryptNative.AlgorithmName.ECDHP384); } return s_ecdhp384; } } public static CngAlgorithm ECDiffieHellmanP521 { get { Contract.Ensures(Contract.Result () != null); if (s_ecdhp521 == null) { s_ecdhp521 = new CngAlgorithm(BCryptNative.AlgorithmName.ECDHP521); } return s_ecdhp521; } } public static CngAlgorithm ECDsaP256 { get { Contract.Ensures(Contract.Result () != null); if (s_ecdsap256 == null) { s_ecdsap256 = new CngAlgorithm(BCryptNative.AlgorithmName.ECDsaP256); } return s_ecdsap256; } } public static CngAlgorithm ECDsaP384 { get { Contract.Ensures(Contract.Result () != null); if (s_ecdsap384 == null) { s_ecdsap384 = new CngAlgorithm(BCryptNative.AlgorithmName.ECDsaP384); } return s_ecdsap384; } } public static CngAlgorithm ECDsaP521 { get { Contract.Ensures(Contract.Result () != null); if (s_ecdsap521 == null) { s_ecdsap521 = new CngAlgorithm(BCryptNative.AlgorithmName.ECDsaP521); } return s_ecdsap521; } } public static CngAlgorithm MD5 { get { Contract.Ensures(Contract.Result () != null); if (s_md5 == null) { s_md5 = new CngAlgorithm(BCryptNative.AlgorithmName.MD5); } return s_md5; } } public static CngAlgorithm Sha1 { get { Contract.Ensures(Contract.Result () != null); if (s_sha1 == null) { s_sha1 = new CngAlgorithm(BCryptNative.AlgorithmName.Sha1); } return s_sha1; } } public static CngAlgorithm Sha256 { get { Contract.Ensures(Contract.Result () != null); if (s_sha256 == null) { s_sha256 = new CngAlgorithm(BCryptNative.AlgorithmName.Sha256); } return s_sha256; } } public static CngAlgorithm Sha384 { get { Contract.Ensures(Contract.Result () != null); if (s_sha384 == null) { s_sha384 = new CngAlgorithm(BCryptNative.AlgorithmName.Sha384); } return s_sha384; } } public static CngAlgorithm Sha512 { get { Contract.Ensures(Contract.Result () != null); if (s_sha512 == null) { s_sha512 = new CngAlgorithm(BCryptNative.AlgorithmName.Sha512); } return s_sha512; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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