Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Cryptography / dsa.cs / 1305376 / dsa.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // // // DSA.cs // namespace System.Security.Cryptography { using System.Text; using System.Runtime.Serialization; using System.Security.Util; using System.Globalization; using System.Diagnostics.Contracts; // DSAParameters is serializable so that one could pass the public parameters // across a remote call, but we explicitly make the private key X non-serializable // so you cannot accidently send it along with the public parameters. [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public struct DSAParameters { public byte[] P; public byte[] Q; public byte[] G; public byte[] Y; public byte[] J; [NonSerialized] public byte[] X; public byte[] Seed; public int Counter; } [System.Runtime.InteropServices.ComVisible(true)] public abstract class DSA : AsymmetricAlgorithm { // // Extending this class allows us to know that you are really implementing // an DSA key. This is required for anybody providing a new DSA key value // implemention. // // The class provides no methods, fields or anything else. Its only purpose is // as a heirarchy member for identification of the algorithm. // protected DSA() { } // // public methods // [System.Security.SecuritySafeCritical] // auto-generated new static public DSA Create() { return Create("System.Security.Cryptography.DSA"); } [System.Security.SecuritySafeCritical] // auto-generated new static public DSA Create(String algName) { return (DSA) CryptoConfig.CreateFromName(algName); } abstract public byte[] CreateSignature(byte[] rgbHash); abstract public bool VerifySignature(byte[] rgbHash, byte[] rgbSignature); // We can provide a default implementation of FromXmlString because we require // every DSA implementation to implement ImportParameters // All we have to do here is parse the XML. public override void FromXmlString(String xmlString) { if (xmlString == null) throw new ArgumentNullException("xmlString"); Contract.EndContractBlock(); DSAParameters dsaParams = new DSAParameters(); Parser p = new Parser(xmlString); SecurityElement topElement = p.GetTopElement(); // P is always present String pString = topElement.SearchForTextOfLocalName("P"); if (pString == null) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFromXmlString","DSA","P")); } dsaParams.P = Convert.FromBase64String(Utils.DiscardWhiteSpaces(pString)); // Q is always present String qString = topElement.SearchForTextOfLocalName("Q"); if (qString == null) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFromXmlString","DSA","Q")); } dsaParams.Q = Convert.FromBase64String(Utils.DiscardWhiteSpaces(qString)); // G is always present String gString = topElement.SearchForTextOfLocalName("G"); if (gString == null) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFromXmlString","DSA","G")); } dsaParams.G = Convert.FromBase64String(Utils.DiscardWhiteSpaces(gString)); // Y is always present String yString = topElement.SearchForTextOfLocalName("Y"); if (yString == null) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFromXmlString","DSA","Y")); } dsaParams.Y = Convert.FromBase64String(Utils.DiscardWhiteSpaces(yString)); // J is optional String jString = topElement.SearchForTextOfLocalName("J"); if (jString != null) dsaParams.J = Convert.FromBase64String(Utils.DiscardWhiteSpaces(jString)); // X is optional -- private key if present String xString = topElement.SearchForTextOfLocalName("X"); if (xString != null) dsaParams.X = Convert.FromBase64String(Utils.DiscardWhiteSpaces(xString)); // Seed and PgenCounter are optional as a unit -- both present or both absent String seedString = topElement.SearchForTextOfLocalName("Seed"); String pgenCounterString = topElement.SearchForTextOfLocalName("PgenCounter"); if ((seedString != null) && (pgenCounterString != null)) { dsaParams.Seed = Convert.FromBase64String(Utils.DiscardWhiteSpaces(seedString)); dsaParams.Counter = Utils.ConvertByteArrayToInt(Convert.FromBase64String(Utils.DiscardWhiteSpaces(pgenCounterString))); } else if ((seedString != null) || (pgenCounterString != null)) { if (seedString == null) { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFromXmlString","DSA","Seed")); } else { throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidFromXmlString","DSA","PgenCounter")); } } ImportParameters(dsaParams); } // We can provide a default implementation of ToXmlString because we require // every DSA implementation to implement ImportParameters // If includePrivateParameters is false, this is just an XMLDSIG DSAKeyValue // clause. If includePrivateParameters is true, then we extend DSAKeyValue with // the other (private) elements. public override String ToXmlString(bool includePrivateParameters) { // From the XMLDSIG spec, RFC 3075, Section 6.4.1, a DSAKeyValue looks like this: /**/ // we extend appropriately for private component X DSAParameters dsaParams = this.ExportParameters(includePrivateParameters); StringBuilder sb = new StringBuilder(); sb.Append(" "); // Add P, Q, G and Y sb.Append(" "); return(sb.ToString()); } abstract public DSAParameters ExportParameters(bool includePrivateParameters); abstract public void ImportParameters(DSAParameters parameters); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007."+Convert.ToBase64String(dsaParams.P)+"
"); sb.Append(""+Convert.ToBase64String(dsaParams.Q)+""); sb.Append(""+Convert.ToBase64String(dsaParams.G)+" "); sb.Append(""+Convert.ToBase64String(dsaParams.Y)+" "); // Add optional components if present if (dsaParams.J != null) { sb.Append(""+Convert.ToBase64String(dsaParams.J)+" "); } if ((dsaParams.Seed != null)) { // note we assume counter is correct if Seed is present sb.Append(""+Convert.ToBase64String(dsaParams.Seed)+" "); sb.Append(""+Convert.ToBase64String(Utils.ConvertIntToByteArray(dsaParams.Counter))+" "); } if (includePrivateParameters) { // Add the private component sb.Append(""+Convert.ToBase64String(dsaParams.X)+" "); } sb.Append("
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