Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / DSACryptoServiceProvider.cs / 1 / DSACryptoServiceProvider.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // DSACryptoServiceProvider.cs // // CSP-based implementation of DSA // namespace System.Security.Cryptography { using System; using System.IO; using System.Security.Cryptography.X509Certificates; using System.Security.Permissions; using System.Globalization; // Object layout of the DSAParameters structure internal class DSACspObject { internal byte[] P; internal byte[] Q; internal byte[] G; internal byte[] Y; internal byte[] J; internal byte[] X; internal byte[] Seed; internal int Counter; } [System.Runtime.InteropServices.ComVisible(true)] public sealed class DSACryptoServiceProvider : DSA, ICspAsymmetricAlgorithm { private int _dwKeySize; private CspParameters _parameters; private bool _randomKeyContainer; private SafeProvHandle _safeProvHandle; private SafeKeyHandle _safeKeyHandle; private SHA1CryptoServiceProvider _sha1; private static CspProviderFlags s_UseMachineKeyStore = 0; // // public constructors // public DSACryptoServiceProvider() : this(0, new CspParameters(Constants.PROV_DSS_DH, null, null, s_UseMachineKeyStore)) { } public DSACryptoServiceProvider(int dwKeySize) : this(dwKeySize, new CspParameters(Constants.PROV_DSS_DH, null, null, s_UseMachineKeyStore)) { } public DSACryptoServiceProvider(CspParameters parameters) : this(0, parameters) { } public DSACryptoServiceProvider(int dwKeySize, CspParameters parameters) { if (dwKeySize < 0) throw new ArgumentOutOfRangeException("dwKeySize", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); _parameters = Utils.SaveCspParameters(CspAlgorithmType.Dss, parameters, s_UseMachineKeyStore, ref _randomKeyContainer); LegalKeySizesValue = new KeySizes[] { new KeySizes(512, 1024, 64) }; // per the DSS spec _dwKeySize = dwKeySize; _sha1 = new SHA1CryptoServiceProvider(); // If this is not a random container we generate, create it eagerly // in the constructor so we can report any errors now. if (!_randomKeyContainer || Environment.GetCompatibilityFlag(CompatibilityFlag.EagerlyGenerateRandomAsymmKeys)) GetKeyPair(); } // // private methods // private void GetKeyPair () { if (_safeKeyHandle == null) { lock (this) { if (_safeKeyHandle == null) Utils.GetKeyPairHelper(CspAlgorithmType.Dss, _parameters, _randomKeyContainer, _dwKeySize, ref _safeProvHandle, ref _safeKeyHandle); } } } protected override void Dispose(bool disposing) { if (_safeKeyHandle != null && !_safeKeyHandle.IsClosed) _safeKeyHandle.Dispose(); if (_safeProvHandle != null && !_safeProvHandle.IsClosed) _safeProvHandle.Dispose(); } // // public properties // [System.Runtime.InteropServices.ComVisible(false)] public bool PublicOnly { get { GetKeyPair(); byte[] publicKey = (byte[]) Utils._GetKeyParameter(_safeKeyHandle, Constants.CLR_PUBLICKEYONLY); return (publicKey[0] == 1); } } [System.Runtime.InteropServices.ComVisible(false)] public CspKeyContainerInfo CspKeyContainerInfo { get { GetKeyPair(); return new CspKeyContainerInfo(_parameters, _randomKeyContainer); } } public override int KeySize { get { GetKeyPair(); byte[] keySize = (byte[]) Utils._GetKeyParameter(_safeKeyHandle, Constants.CLR_KEYLEN); _dwKeySize = (keySize[0] | (keySize[1] << 8) | (keySize[2] << 16) | (keySize[3] << 24)); return _dwKeySize; } } public override string KeyExchangeAlgorithm { get { return null; } } public override string SignatureAlgorithm { get { return "http://www.w3.org/2000/09/xmldsig#dsa-sha1"; } } public static bool UseMachineKeyStore { get { return (s_UseMachineKeyStore == CspProviderFlags.UseMachineKeyStore); } set { s_UseMachineKeyStore = (value ? CspProviderFlags.UseMachineKeyStore : 0); } } public bool PersistKeyInCsp { get { if (_safeProvHandle == null) { lock (this) { if (_safeProvHandle == null) _safeProvHandle = Utils.CreateProvHandle(_parameters, _randomKeyContainer); } } return Utils._GetPersistKeyInCsp(_safeProvHandle); } set { bool oldPersistKeyInCsp = this.PersistKeyInCsp; if (value == oldPersistKeyInCsp) return; KeyContainerPermission kp = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags); if (!value) { KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(_parameters, KeyContainerPermissionFlags.Delete); kp.AccessEntries.Add(entry); } else { KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(_parameters, KeyContainerPermissionFlags.Create); kp.AccessEntries.Add(entry); } kp.Demand(); Utils._SetPersistKeyInCsp(_safeProvHandle, value); } } // // public methods // public override DSAParameters ExportParameters (bool includePrivateParameters) { GetKeyPair(); if (includePrivateParameters) { KeyContainerPermission kp = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags); KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(_parameters, KeyContainerPermissionFlags.Export); kp.AccessEntries.Add(entry); kp.Demand(); } DSACspObject dsaCspObject = new DSACspObject(); int blobType = includePrivateParameters ? Constants.PRIVATEKEYBLOB : Constants.PUBLICKEYBLOB; // _ExportKey will check for failures and throw an exception Utils._ExportKey(_safeKeyHandle, blobType, dsaCspObject); return DSAObjectToStruct(dsaCspObject); } [System.Runtime.InteropServices.ComVisible(false)] public byte[] ExportCspBlob (bool includePrivateParameters) { GetKeyPair(); return Utils.ExportCspBlobHelper(includePrivateParameters, _parameters, _safeKeyHandle); } public override void ImportParameters(DSAParameters parameters) { DSACspObject dsaCspObject = DSAStructToObject(parameters); // Free the current key handle if (_safeKeyHandle != null && !_safeKeyHandle.IsClosed) _safeKeyHandle.Dispose(); _safeKeyHandle = SafeKeyHandle.InvalidHandle; if (IsPublic(parameters)) { // Use our CRYPT_VERIFYCONTEXT handle, CRYPT_EXPORTABLE is not applicable to public only keys, so pass false Utils._ImportKey(Utils.StaticDssProvHandle, Constants.CALG_DSS_SIGN, (CspProviderFlags) 0, dsaCspObject, ref _safeKeyHandle); } else { KeyContainerPermission kp = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags); KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(_parameters, KeyContainerPermissionFlags.Import); kp.AccessEntries.Add(entry); kp.Demand(); if (_safeProvHandle == null) _safeProvHandle = Utils.CreateProvHandle(_parameters, _randomKeyContainer); // Now, import the key into the CSP; _ImportKey will check for failures. Utils._ImportKey(_safeProvHandle, Constants.CALG_DSS_SIGN, _parameters.Flags, dsaCspObject, ref _safeKeyHandle); } } [System.Runtime.InteropServices.ComVisible(false)] public void ImportCspBlob (byte[] keyBlob) { Utils.ImportCspBlobHelper(CspAlgorithmType.Dss, keyBlob, IsPublic(keyBlob), ref _parameters, _randomKeyContainer, ref _safeProvHandle, ref _safeKeyHandle); } public byte[] SignData(Stream inputStream) { byte[] hashVal = _sha1.ComputeHash(inputStream); return SignHash(hashVal, null); } public byte[] SignData(byte[] buffer) { byte[] hashVal = _sha1.ComputeHash(buffer); return SignHash(hashVal, null); } public byte[] SignData(byte[] buffer, int offset, int count) { byte[] hashVal = _sha1.ComputeHash(buffer, offset, count); return SignHash(hashVal, null); } public bool VerifyData(byte[] rgbData, byte[] rgbSignature) { byte[] hashVal = _sha1.ComputeHash(rgbData); return VerifyHash(hashVal, null, rgbSignature); } override public byte[] CreateSignature(byte[] rgbHash) { return SignHash(rgbHash, null); } override public bool VerifySignature(byte[] rgbHash, byte[] rgbSignature) { return VerifyHash(rgbHash, null, rgbSignature); } public byte[] SignHash(byte[] rgbHash, string str) { if (rgbHash == null) throw new ArgumentNullException("rgbHash"); if (PublicOnly) throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NoPrivateKey")); int calgHash = X509Utils.OidToAlgId(str); if (rgbHash.Length != _sha1.HashSize / 8) throw new CryptographicException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Cryptography_InvalidHashSize"), "SHA1", _sha1.HashSize / 8)); GetKeyPair(); if (!CspKeyContainerInfo.RandomlyGenerated) { KeyContainerPermission kp = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags); KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(_parameters, KeyContainerPermissionFlags.Sign); kp.AccessEntries.Add(entry); kp.Demand(); } return Utils._SignValue(_safeKeyHandle, _parameters.KeyNumber, Constants.CALG_DSS_SIGN, calgHash, rgbHash, 0); } public bool VerifyHash(byte[] rgbHash, string str, byte[] rgbSignature) { if (rgbHash == null) throw new ArgumentNullException("rgbHash"); if (rgbSignature == null) throw new ArgumentNullException("rgbSignature"); int calgHash = X509Utils.OidToAlgId(str); if (rgbHash.Length != _sha1.HashSize / 8) throw new CryptographicException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Cryptography_InvalidHashSize"), "SHA1", _sha1.HashSize / 8)); GetKeyPair(); return Utils._VerifySign(_safeKeyHandle, Constants.CALG_DSS_SIGN, calgHash, rgbHash, rgbSignature, 0); } // // private static methods // private static DSAParameters DSAObjectToStruct (DSACspObject dsaCspObject) { DSAParameters dsaParams = new DSAParameters(); dsaParams.P = dsaCspObject.P; dsaParams.Q = dsaCspObject.Q; dsaParams.G = dsaCspObject.G; dsaParams.Y = dsaCspObject.Y; dsaParams.J = dsaCspObject.J; dsaParams.X = dsaCspObject.X; dsaParams.Seed = dsaCspObject.Seed; dsaParams.Counter = dsaCspObject.Counter; return dsaParams; } private static DSACspObject DSAStructToObject (DSAParameters dsaParams) { DSACspObject dsaCspObject = new DSACspObject(); dsaCspObject.P = dsaParams.P; dsaCspObject.Q = dsaParams.Q; dsaCspObject.G = dsaParams.G; dsaCspObject.Y = dsaParams.Y; dsaCspObject.J = dsaParams.J; dsaCspObject.X = dsaParams.X; dsaCspObject.Seed = dsaParams.Seed; dsaCspObject.Counter = dsaParams.Counter; return dsaCspObject; } private static bool IsPublic (DSAParameters dsaParams) { return (dsaParams.X == null); } // find whether a DSS key blob is public. private static bool IsPublic (byte[] keyBlob) { if (keyBlob == null) throw new ArgumentNullException("keyBlob"); // The CAPI DSS public key representation consists of the following sequence: // - BLOBHEADER // - DSSPUBKEY // - rgbP[cbKey] // - rgbQ[20] // - rgbG[cbKey] // - rgbY[cbKey] // - DSSSEED // The first should be PUBLICKEYBLOB and magic should be DSS_MAGIC "DSS1" or DSS_PUB_MAGIC_VER3 "DSS3" if (keyBlob[0] != Constants.PUBLICKEYBLOB) return false; if ((keyBlob[11] != 0x31 && keyBlob[11] != 0x33) || keyBlob[10] != 0x53 || keyBlob[9] != 0x53 || keyBlob[8] != 0x44) return false; return true; } } }
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