StrongName.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / StrongName.cs / 1 / 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.Security.Util;
    using System.Security.Permissions; 
    using CultureInfo = System.Globalization.CultureInfo; 

    [Serializable] 
    [System.Runtime.InteropServices.ComVisible(true)]
    sealed public class StrongName : IIdentityPermissionFactory, IBuiltInEvidence
    {
        private StrongNamePublicKeyBlob m_publicKeyBlob; 
        private String m_name;
        private Version m_version; 
 
        internal StrongName() {}
 
        public StrongName( StrongNamePublicKeyBlob blob, String name, Version version )
        {
            if (name == null)
                throw new ArgumentNullException( "name" ); 
            if (name.Equals( "" ))
                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; 
        }
 
        internal StrongName( StrongNamePublicKeyBlob blob, String name, Version version, bool trash )
        {
            m_publicKeyBlob = blob;
            m_name = name; 
            m_version = version;
        } 
 
        public StrongNamePublicKeyBlob PublicKey
        { 
            get
            {
                return m_publicKeyBlob;
            } 
        }
 
        public String Name 
        {
            get 
            {
                return m_name;
            }
        } 

        public Version Version 
        { 
            get
            { 
                return m_version;
            }
        }
 
        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; 
        }
    }
}

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