SHA1 Class

Definition

Namespace:

System.Security.Cryptography

Assembly:

System.Security.Cryptography.dll

Source:

SHA1.cs

Computes the SHA1 hash for the input data.

public ref class SHA1 abstract : System::Security::Cryptography::HashAlgorithm

public abstract class SHA1 : System.Security.Cryptography.HashAlgorithm

type SHA1 = class
    inherit HashAlgorithm

Public MustInherit Class SHA1
Inherits HashAlgorithm

Inheritance

Object

HashAlgorithm

SHA1

Derived

System.Security.Cryptography.SHA1Cng

System.Security.Cryptography.SHA1CryptoServiceProvider

System.Security.Cryptography.SHA1Managed

Remarks

The hash is used as a unique value of fixed size representing a large amount of data. Hashes of two sets of data should match if the corresponding data also matches. Small changes to the data result in large, unpredictable changes in the hash.

The hash size for the SHA1 algorithm is 160 bits.

Due to collision problems with SHA1, Microsoft recommends a security model based on SHA256 or better.

Constructors

SHA1()

Initializes a new instance of SHA1.

Fields

HashSizeInBits	The hash size produced by the SHA1 algorithm, in bits.
HashSizeInBytes	The hash size produced by the SHA1 algorithm, in bytes.
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)
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)
OutputBlockSize	When overridden in a derived class, gets the output block size. (Inherited from HashAlgorithm)

Methods

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)	Asynchronously computes the hash value for the specified Stream object. (Inherited from HashAlgorithm)
Create()	Creates an instance of the default implementation of SHA1.
Create(String)	Obsolete. Creates an instance of the specified implementation of SHA1.
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 HashAlgorithm and optionally releases the managed resources. (Inherited from HashAlgorithm)
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)	When overridden in a derived class, routes data written to the object into the hash algorithm for computing the hash. (Inherited from HashAlgorithm)
HashCore(ReadOnlySpan<Byte>)	Routes data written to the object into the hash algorithm for computing the hash. (Inherited from HashAlgorithm)
HashData(Byte[])	Computes the hash of data using the SHA1 algorithm.
HashData(ReadOnlySpan<Byte>)	Computes the hash of data using the SHA1 algorithm.
HashData(ReadOnlySpan<Byte>, Span<Byte>)	Computes the hash of data using the SHA1 algorithm.
HashData(Stream)	Computes the hash of a stream using the SHA1 algorithm.
HashData(Stream, Span<Byte>)	Computes the hash of a stream using the SHA1 algorithm.
HashDataAsync(Stream, CancellationToken)	Asynchronously computes the hash of a stream using the SHA1 algorithm.
HashDataAsync(Stream, Memory<Byte>, CancellationToken)	Asynchronously computes the hash of a stream using the SHA1 algorithm.
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. (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)
TryHashData(ReadOnlySpan<Byte>, Span<Byte>, Int32)	Attempts to compute the hash of data using the SHA1 algorithm.
TryHashFinal(Span<Byte>, Int32)	Attempts to finalize the hash computation after the last data is processed by the hash algorithm. (Inherited from HashAlgorithm)

See also

• Cryptographic Services