StrongName.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Security / Policy / StrongName.cs / 3 / StrongName.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
// StrongName.cs 
//
// StrongName is an IIdentity representing strong names. 
//

namespace System.Security.Policy {
    using System.IO; 
    using System.Reflection;
    using System.Security.Util; 
    using System.Security.Permissions; 
    using CultureInfo = System.Globalization.CultureInfo;
 
    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)]
    sealed public class StrongName : IIdentityPermissionFactory, IBuiltInEvidence, IDelayEvaluatedEvidence
    { 
        private StrongNamePublicKeyBlob m_publicKeyBlob;
        private String m_name; 
        private Version m_version; 

        // Delay evaluated evidence is for policy resolution only, so it doesn't make sense to save that 
        // state away and then try to evaluate the strong name later.
        [NonSerialized]
        private Assembly m_assembly = null;
 
        [NonSerialized]
        private bool m_wasUsed = false; 
 
        internal StrongName() {}
 
        public StrongName( StrongNamePublicKeyBlob blob, String name, Version version ) : this(blob, name, version, null)
        {
        }
 
        internal StrongName(StrongNamePublicKeyBlob blob, String name, Version version, Assembly assembly)
        { 
            if (name == null) 
                throw new ArgumentNullException("name");
            if (String.IsNullOrEmpty(name)) 
                throw new ArgumentException(Environment.GetResourceString("Argument_EmptyStrongName"));

            if (blob == null)
                throw new ArgumentNullException("blob"); 

            if (version == null) 
                throw new ArgumentNullException("version"); 

            m_publicKeyBlob = blob; 
            m_name = name;
            m_version = version;
            m_assembly = assembly;
        } 

        public StrongNamePublicKeyBlob PublicKey 
        { 
            get
            { 
                return m_publicKeyBlob;
            }
        }
 
        public String Name
        { 
            get 
            {
                return m_name; 
            }
        }

        public Version Version 
        {
            get 
            { 
                return m_version;
            } 
        }

        bool IDelayEvaluatedEvidence.IsVerified
        { 
            get { return m_assembly != null ? m_assembly.IsStrongNameVerified() : true; }
        } 
 
        bool IDelayEvaluatedEvidence.WasUsed
        { 
            get { return m_wasUsed; }
        }

        void IDelayEvaluatedEvidence.MarkUsed() 
        {
            m_wasUsed = true; 
        } 

        internal static bool CompareNames( String asmName, String mcName ) 
        {
            if (mcName.Length > 0 && mcName[mcName.Length-1] == '*' && mcName.Length - 1 <= asmName.Length)
                return String.Compare( mcName, 0, asmName, 0, mcName.Length - 1, StringComparison.OrdinalIgnoreCase) == 0;
            else 
                return String.Compare( mcName, asmName, StringComparison.OrdinalIgnoreCase) == 0;
        } 
 
        public IPermission CreateIdentityPermission( Evidence evidence )
        { 
            return new StrongNameIdentityPermission( m_publicKeyBlob, m_name, m_version );
        }

        public Object Copy() 
        {
            return new StrongName( m_publicKeyBlob, m_name, m_version ); 
        } 

        internal SecurityElement ToXml() 
        {
            SecurityElement root = new SecurityElement( "StrongName" );
            root.AddAttribute( "version", "1" );
 
            if (m_publicKeyBlob != null)
                root.AddAttribute( "Key", System.Security.Util.Hex.EncodeHexString( m_publicKeyBlob.PublicKey ) ); 
 
            if (m_name != null)
                root.AddAttribute( "Name", m_name ); 

            if (m_version != null)
                root.AddAttribute( "Version", m_version.ToString() );
 
            return root;
        } 
 
        internal void FromXml (SecurityElement element)
        { 
            if (element == null)
                throw new ArgumentNullException("element");
            if (String.Compare(element.Tag, "StrongName", StringComparison.Ordinal) != 0)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidXML")); 

            m_publicKeyBlob = null; 
            m_version = null; 

            string key = element.Attribute("Key"); 
            if (key != null)
                m_publicKeyBlob = new StrongNamePublicKeyBlob(System.Security.Util.Hex.DecodeHexString(key));

            m_name = element.Attribute("Name"); 

            string version = element.Attribute("Version"); 
            if (version != null) 
                m_version = new Version(version);
        } 

        public override String ToString()
        {
            return ToXml().ToString(); 
        }
 
        public override bool Equals( Object o ) 
        {
            StrongName that = (o as StrongName); 
            return (that != null) &&
                   Equals( this.m_publicKeyBlob, that.m_publicKeyBlob ) &&
                   Equals( this.m_name, that.m_name ) &&
                   Equals( this.m_version, that.m_version ); 
        }
 
        public override int GetHashCode() 
        {
            if (m_publicKeyBlob != null) 
            {
                return m_publicKeyBlob.GetHashCode();
            }
            else if (m_name != null || m_version != null) 
            {
                return (m_name == null ? 0 : m_name.GetHashCode()) + (m_version == null ? 0 : m_version.GetHashCode()); 
            } 
            else
            { 
                return typeof( StrongName ).GetHashCode();
            }
        }
 
        /// 
        int IBuiltInEvidence.OutputToBuffer( char[] buffer, int position, bool verbose ) 
        { 
            // StrongNames have a byte[], a string, and a Version (4 ints).
            // Copy in the id, the byte[], the four ints, and then the string. 

            buffer[position++] = BuiltInEvidenceHelper.idStrongName;
            int lengthPK = m_publicKeyBlob.PublicKey.Length;
            if (verbose) 
            {
                BuiltInEvidenceHelper.CopyIntToCharArray(lengthPK, buffer, position); 
                position += 2; 
            }
            Buffer.InternalBlockCopy(m_publicKeyBlob.PublicKey, 0, buffer, position * 2, lengthPK); 
            position += ((lengthPK - 1) / 2) + 1;

            BuiltInEvidenceHelper.CopyIntToCharArray( m_version.Major,    buffer, position     );
            BuiltInEvidenceHelper.CopyIntToCharArray( m_version.Minor,    buffer, position + 2 ); 
            BuiltInEvidenceHelper.CopyIntToCharArray( m_version.Build,    buffer, position + 4 );
            BuiltInEvidenceHelper.CopyIntToCharArray( m_version.Revision, buffer, position + 6 ); 
 
            position += 8;
            int lengthName = m_name.Length; 
            if (verbose)
            {
                BuiltInEvidenceHelper.CopyIntToCharArray(lengthName, buffer, position);
                position += 2; 
            }
            m_name.CopyTo( 0, buffer, position, lengthName ); 
 
            return lengthName + position;
        } 

        /// 
        int IBuiltInEvidence.GetRequiredSize(bool verbose )
        { 
            int length = ((m_publicKeyBlob.PublicKey.Length - 1) / 2) + 1; // blob
            if (verbose) 
                length += 2;        // length of blob 

            length += 8;            // version 

            length += m_name.Length;// Name
            if (verbose)
                length += 2;        // length of name 

            length += 1;            // identifier 
            return length; 
        }
 
        /// 
        int IBuiltInEvidence.InitFromBuffer( char[] buffer, int position )
        {
            int length = BuiltInEvidenceHelper.GetIntFromCharArray(buffer, position); 
            position += 2;
            m_publicKeyBlob = new StrongNamePublicKeyBlob(); 
            m_publicKeyBlob.PublicKey = new byte[length]; 

            int lengthInChars = ((length - 1) / 2) + 1; 
            Buffer.InternalBlockCopy(buffer, position * 2, m_publicKeyBlob.PublicKey, 0, length);
            position += lengthInChars;

            int major = BuiltInEvidenceHelper.GetIntFromCharArray(buffer, position); 
            int minor = BuiltInEvidenceHelper.GetIntFromCharArray(buffer, position + 2);
            int build = BuiltInEvidenceHelper.GetIntFromCharArray(buffer, position + 4); 
            int revision = BuiltInEvidenceHelper.GetIntFromCharArray(buffer, position + 6); 
            m_version = new Version(major, minor, build, revision);
            position += 8; 

            length = BuiltInEvidenceHelper.GetIntFromCharArray(buffer, position);
            position += 2;
 
            m_name = new String(buffer, position, length );
 
            return position + length; 
        }
 
        // INormalizeForIsolatedStorage is not implemented for startup perf
        // equivalent to INormalizeForIsolatedStorage.Normalize()
        internal Object Normalize()
        { 
            MemoryStream ms = new MemoryStream();
            BinaryWriter bw = new BinaryWriter(ms); 
 
            bw.Write(m_publicKeyBlob.PublicKey);
            bw.Write(m_version.Major); 
            bw.Write(m_name);

            ms.Position = 0;
            return ms; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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