A keyed hash algorithm is a key-dependent, one-way hash function used as a message authentication code. Only someone who knows the key can verify the hash. Keyed hash algorithms provide authenticity without secrecy. Hash functions are commonly used with digital signatures and for data integrity. A key of the same size as the hash output (for instance, 256 bits for 'HS256') or larger MUST be used with this algorithm. (This requirement is based on Section 5.3.4 (Security Effect of the HMAC Key) of NIST SP 800-117 (sic) NIST.800-107 , which states that the effective security strength is the minimum of the security strength of the key.
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Definition
Represents the abstract class from which all implementations of keyed hash algorithms must derive.
- Inheritance
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KeyedHashAlgorithm
- Derived
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- Attributes
Examples
The following code example demonstrates how to derive from the KeyedHashAlgorithm class.Remarks
Hash functions map binary strings of an arbitrary length to small binary strings of a fixed length. A cryptographic hash function has the property that it is computationally infeasible to find two distinct inputs that hash to the same value. Small changes to the data result in large, unpredictable changes in the hash.A keyed hash algorithm is a key-dependent, one-way hash function used as a message authentication code. Only someone who knows the key can verify the hash. Keyed hash algorithms provide authenticity without secrecy.Hash functions are commonly used with digital signatures and for data integrity. The HMACSHA1 class is an example of a keyed hash algorithm.Due to collision problems with SHA1, Microsoft recommends a security model based on SHA256 or better.Constructors
KeyedHashAlgorithm() Initializes a new instance of the KeyedHashAlgorithm class.Fields
HashSizeValue Represents the size, in bits, of the computed hash code.(Inherited from HashAlgorithm)HashValue Represents the value of the computed hash code.(Inherited from HashAlgorithm)KeyValue The key to use in the hash algorithm.State Represents the state of the hash computation.(Inherited from HashAlgorithm)Properties
CanReuseTransform Gets a value indicating whether the current transform can be reused.(Inherited from HashAlgorithm)CanTransformMultipleBlocks When overridden in a derived class, gets a value indicating whether multiple blocks can be transformed.(Inherited from HashAlgorithm)Hash Gets the value of the computed hash code.(Inherited from HashAlgorithm)HashSize Gets the size, in bits, of the computed hash code.(Inherited from HashAlgorithm)InputBlockSize When overridden in a derived class, gets the input block size.(Inherited from HashAlgorithm)Key Gets or sets the key to use in the hash algorithm.OutputBlockSize When overridden in a derived class, gets the output block size.(Inherited from HashAlgorithm)Hash Generator Md5
Methods
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Clear() Releases all resources used by the HashAlgorithm class.(Inherited from HashAlgorithm)ComputeHash(Byte[]) Computes the hash value for the specified byte array.(Inherited from HashAlgorithm)ComputeHash(Byte[], Int32, Int32) Computes the hash value for the specified region of the specified byte array.(Inherited from HashAlgorithm)ComputeHash(Stream) Computes the hash value for the specified Stream object.(Inherited from HashAlgorithm)ComputeHashAsync(Stream, CancellationToken) (Inherited from HashAlgorithm) Create() Creates an instance of the default implementation of a keyed hash algorithm.Create(String) Creates an instance of the specified implementation of a keyed hash algorithm.Dispose() Releases all resources used by the current instance of the HashAlgorithm class.(Inherited from HashAlgorithm)Dispose(Boolean) Releases the unmanaged resources used by the KeyedHashAlgorithm and optionally releases the managed resources.Equals(Object) Determines whether the specified object is equal to the current object.(Inherited from Object)Finalize() This member overrides Finalize(), and more complete documentation might be available in that topic.Allows an Object to attempt to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection.GetHashCode() Serves as the default hash function.(Inherited from Object)GetType() Gets the Type of the current instance.(Inherited from Object)HashCore(Byte[], Int32, Int32) When overridden in a derived class, routes data written to the object into the hash algorithm for computing the hash.Jul 22, 2019 Universal Keygen Generator Online allows you to generate the serial numbers or product keys for all software.you can easily generate a serial key for any version and any software. It is a perfect software for beginners and professionals. Free download activation key generator.(Inherited from HashAlgorithm)HashCore(ReadOnlySpan<Byte>) Routes data written to the object into the hash algorithm for computing the hash.(Inherited from HashAlgorithm)HashFinal() When overridden in a derived class, finalizes the hash computation after the last data is processed by the cryptographic hash algorithm.(Inherited from HashAlgorithm)Initialize() Resets the hash algorithm to its initial state.(Inherited from HashAlgorithm)MemberwiseClone() Creates a shallow copy of the current Object.(Inherited from Object)ToString() Returns a string that represents the current object.Microsoft office 2013 professional plus product key gives you a chance to utilise this opportunity as it will help you to hold an online meeting efficiently and any time you need. You can communicate with each other during the session and even share files like a real sitting meeting. Mar 09, 2020 Microsoft Office 2013 Product Key Generator (Updated List) Microsoft Office 2013 Product Key Generator has been a part of many lives for decades. It facilitates professionals, businesses, student and individuals for personal purposes. There have been many versions created, each more enhanced than the next. Microsoft office professional plus 2013 product key generator online sims 1.You can even get the Microsoft Office 2010 Serial key and use the Microsoft Office 2010 key.Microsoft Office 2010 programs have several intriguing features that make it easy for both people with limitations to using these products, for all content creators, presentations, create more accessible documents, and other content. It verifies that the text of the program is genuine. The loss of a product for Microsoft Office 2010 usually means that the software is useless once it installs, so you should be very careful about your key and have it securely with you. Microsoft office 2010 key generator. Should be restored. Otherwise, you will not be able to reuse your office if you reinstall it.(Inherited from Object)TransformBlock(Byte[], Int32, Int32, Byte[], Int32) Computes the hash value for the specified region of the input byte array and copies the specified region of the input byte array to the specified region of the output byte array.(Inherited from HashAlgorithm)TransformFinalBlock(Byte[], Int32, Int32) Computes the hash value for the specified region of the specified byte array.(Inherited from HashAlgorithm)TryComputeHash(ReadOnlySpan<Byte>, Span<Byte>, Int32) Attempts to compute the hash value for the specified byte array.(Inherited from HashAlgorithm)TryHashFinal(Span<Byte>, Int32) Attempts to finalize the hash computation after the last data is processed by the hash algorithm.(Inherited from HashAlgorithm)Explicit Interface Implementations
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IDisposable.Dispose() Releases the unmanaged resources used by the HashAlgorithm and optionally releases the managed resources.(Inherited from HashAlgorithm)Applies to
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