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Definition

  1. Intelligent Database Design Using Hash Keys Your application may require an index based on a lengthy string, or even worse, a concatenation of two strings, or of a string and one or two integers. In a small table, you might not notice the impact.
  2. By using this key data can be searched in the hash table by few key comparisons and then searching time is dependent upon the size of the hash table. 2) Hash function Hash function is a function which is applied on a key by which it produces an integer, which can be used as an address of hash table.

Computes a Hash-based Message Authentication Code (HMAC) using the SHA512 hash function.

Inheritance
HMACSHA512
Attributes

Examples

The following example shows how to sign a file by using the HMACSHA512 object and then how to verify the file.

Remarks

HMACSHA512 is a type of keyed hash algorithm that is constructed from the SHA-512 hash function and used as a Hash-based Message Authentication Code (HMAC). The HMAC process mixes a secret key with the message data and hashes the result. The hash value is mixed with the secret key again, and then hashed a second time. The output hash is 512 bits in length.

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An HMAC can be used to determine whether a message sent over a nonsecure channel has been tampered with, provided that the sender and receiver share a secret key. The sender computes the hash value for the original data and sends both the original data and hash value as a single message. The receiver recalculates the hash value on the received message and checks that the computed HMAC matches the transmitted HMAC.

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If the original and computed hash values match, the message is authenticated. If they do not match, either the data or the hash value has been changed. HMACs provide security against tampering because knowledge of the secret key is required to change the message and reproduce the correct hash value.

HMACSHA512 accepts keys of any size, and produces a hash sequence of length 512 bits.

Constructors

HMACSHA512()

Initializes a new instance of the HMACSHA512 class with a randomly generated key.

HMACSHA512(Byte[])

Initializes a new instance of the HMACSHA512 class with the specified key data.

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.

(Inherited from KeyedHashAlgorithm)
State

Represents the state of the hash computation.

(Inherited from HashAlgorithm)

Properties

BlockSizeValue

Gets or sets the block size to use in the hash value.

(Inherited from HMAC)
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)
HashName

Gets or sets the name of the hash algorithm to use for hashing.

(Inherited from HMAC)
HashSize

Gets the size, in bits, of the computed HMAC.

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 HMAC calculation.

OutputBlockSize

When overridden in a derived class, gets the output block size.

(Inherited from HashAlgorithm)
ProduceLegacyHmacValues

Provides a workaround for the .NET Framework 2.0 implementation of the HMACSHA512 algorithm, which is inconsistent with the .NET Framework 2.0 Service Pack 1 implementation.

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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)
Dispose()

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(Inherited from HashAlgorithm)
Dispose(Boolean)

Releases the unmanaged resources used by the HMACSHA512 and optionally releases the managed resources.

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
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)

Routes data written to the object into the HMAC algorithm for computing the HMAC.

HashCore(ReadOnlySpan<Byte>)

Routes data written to the object into the HMAC algorithm for computing the HMAC.

HashFinal()

Finalizes the HMAC computation after the last data is processed by the algorithm.

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Initialize()

Resets the hash algorithm to its initial state.

MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Returns a string that represents the current object.

(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 HMAC computation after the last data is processed by the HMAC algorithm.

Explicit Interface Implementations

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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See also