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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
//
//
// 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 System.Diagnostics.Contracts;
using CultureInfo = System.Globalization.CultureInfo;
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class StrongName : EvidenceBase, IIdentityPermissionFactory, 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 RuntimeAssembly 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");
Contract.EndContractBlock();
RuntimeAssembly rtAssembly = assembly as RuntimeAssembly;
if (assembly != null && rtAssembly == null)
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeAssembly"), "assembly");
m_publicKeyBlob = blob;
m_name = name;
m_version = version;
m_assembly = rtAssembly;
}
public StrongNamePublicKeyBlob PublicKey
{
get
{
return m_publicKeyBlob;
}
}
public String Name
{
get
{
return m_name;
}
}
public Version Version
{
get
{
return m_version;
}
}
bool IDelayEvaluatedEvidence.IsVerified
{
[System.Security.SecurityCritical] // auto-generated
get
{
#if FEATURE_CAS_POLICY
return m_assembly != null ? m_assembly.IsStrongNameVerified : true;
#else // !FEATURE_CAS_POLICY
return true;
#endif // FEATURE_CAS_POLICY
}
}
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 override EvidenceBase Clone()
{
return new StrongName(m_publicKeyBlob, m_name, m_version);
}
public Object Copy()
{
return Clone();
}
#if FEATURE_CAS_POLICY
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"));
Contract.EndContractBlock();
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();
}
#endif // FEATURE_CAS_POLICY
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();
}
}
// 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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