Provides evidence about the hash value for an assembly. This class cannot be inherited.

For a list of all members of this type, see Hash Members.

System.Object
   System.Security.Policy.Hash

[Visual Basic]
<Serializable>
NotInheritable Public Class Hash
   Implements ISerializable
[C#]
[Serializable]
public sealed class Hash : ISerializable
[C++]
[Serializable]
public __gc __sealed class Hash : public ISerializable
[JScript]
public
   Serializable
class Hash implements ISerializable

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Remarks

A hash value represents a unique value that corresponds to a particular set of bytes. Rather than referring to an assembly by name, version, or other designation, a hash value designates the assembly without ambiguity. Names are subject to collisions in rare cases where the same name is given to completely different code. Different variations of code can accidentally be marked with the same version. However, even changing a single bit results in a very different hash value.

Hash values are a cryptographically secure way to refer to specific assemblies in policy without the use of digital signatures. A secure hash algorithm is designed so that it is computationally infeasible to construct a different assembly with the identical hash value by either an accidental or malicious attempt. By default, evidence from the SHA1 and MD5 hash algorithms is supported, although any hash algorithm can be used through GenerateHash.

Requirements

Namespace: System.Security.Policy

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: Mscorlib (in Mscorlib.dll)

See Also

Hash Members | System.Security.Policy Namespace