MD5 Class

Reference

Definition

Namespace:: System.Security.Cryptography

Assembly:: System.Security.Cryptography.Algorithms.dll

Assembly:: System.Security.Cryptography.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: MD5.cs

Source:: MD5.cs

Source:: MD5.cs

Important

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Represents the abstract class from which all implementations of the MD5 hash algorithm inherit.

public ref class MD5 abstract : System::Security::Cryptography::HashAlgorithm

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public abstract class MD5 : System.Security.Cryptography.HashAlgorithm

public abstract class MD5 : System.Security.Cryptography.HashAlgorithm

[System.Runtime.InteropServices.ComVisible(true)]
public abstract class MD5 : System.Security.Cryptography.HashAlgorithm

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type MD5 = class
    inherit HashAlgorithm

type MD5 = class
    inherit HashAlgorithm

[<System.Runtime.InteropServices.ComVisible(true)>]
type MD5 = class
    inherit HashAlgorithm

Public MustInherit Class MD5
Inherits HashAlgorithm

Inheritance: Object

HashAlgorithm
MD5

Derived: System.Security.Cryptography.MD5Cng

System.Security.Cryptography.MD5CryptoServiceProvider

Attributes: UnsupportedOSPlatformAttribute ComVisibleAttribute

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; that is, 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 MD5 algorithm is 128 bits.

The ComputeHash methods of the MD5 class return the hash as an array of 16 bytes. Note that some MD5 implementations produce a 32-character, hexadecimal-formatted hash. To interoperate with such implementations, format the return value of the ComputeHash methods as a hexadecimal value.

Note

Due to collision problems with MD5/SHA1, Microsoft recommends SHA256 or SHA512. Consider using the SHA256 class or the SHA512 class instead of the MD5 class. Use MD5 only for compatibility with legacy applications and data.

Constructors

MD5()

Initializes a new instance of MD5.

Fields

HashSizeInBits	The hash size produced by the MD5 algorithm, in bits.
HashSizeInBytes	The hash size produced by the MD5 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[], Int32, Int32)	Computes the hash value for the specified region of the specified byte array. (Inherited from HashAlgorithm)
ComputeHash(Byte[])	Computes the hash value for 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 the MD5 hash algorithm.
Create(String)	Obsolete. Creates an instance of the specified implementation of the MD5 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 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 MD5 algorithm.
HashData(ReadOnlySpan<Byte>, Span<Byte>)	Computes the hash of data using the MD5 algorithm.
HashData(ReadOnlySpan<Byte>)	Computes the hash of data using the MD5 algorithm.
HashData(Stream, Span<Byte>)	Computes the hash of a stream using the MD5 algorithm.
HashData(Stream)	Computes the hash of a stream using the MD5 algorithm.
HashDataAsync(Stream, CancellationToken)	Asynchronously computes the hash of a stream using the MD5 algorithm.
HashDataAsync(Stream, Memory<Byte>, CancellationToken)	Asynchronously computes the hash of a stream using the MD5 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 MD5 algorithm.
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

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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