Small changes to the data result in large unpredictable changes in the hash.ĭue to collision problems with SHA1, Microsoft recommends a security model based on SHA256 or better. Hashes of two sets of data should match if the corresponding data also matches.

The hash is used as a unique value of fixed size representing a large amount of data. Hash functions are commonly used with digital signatures and for data integrity. A cryptographic hash function has the property that it is computationally infeasible to find two distinct inputs that hash to the same value. These functions map binary strings of an arbitrary length to small binary strings of a fixed length, known as hash values. Hash functions are fundamental to modern cryptography. HashAlgorithm^ sha = SHA256::Create() Īrray^ result = sha->ComputeHash( dataArray ) īyte result = sha.ComputeHash(dataArray) ĭim result As Byte() = sha.ComputeHash(dataArray) SHA256 is a derived class of HashAlgorithm. This example assumes that there is a predefined byte array dataArray. The following code example computes the SHA256 hash for an array.

Implements IDisposable Public MustInherit Class HashAlgorithm Implements ICryptoTransform, IDisposable Public MustInherit Class HashAlgorithm

Interface ICryptoTransform Public MustInherit Class HashAlgorithm Interface IDisposable type HashAlgorithm = class Interface ICryptoTransform type HashAlgorithm = class Public abstract class HashAlgorithm : type HashAlgorithm = class public ref class HashAlgorithm abstract : IDisposable, System::Security::Cryptography::ICryptoTransform public ref class HashAlgorithm abstract : IDisposable public ref class HashAlgorithm abstract : System::Security::Cryptography::ICryptoTransform public abstract class HashAlgorithm : IDisposable, public abstract class HashAlgorithm : IDisposable public abstract class HashAlgorithm : Represents the base class from which all implementations of cryptographic hash algorithms must derive.

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