Initializes an instance of System.Security.Cryptography.SHA256Managed.
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 and only if the corresponding data also matches. Small changes to the data result in large unpredictable changes in the hash.
The hash size for the System.Security.Cryptography.SHA256Managed algorithm is 256 bits.