License, except for the contents of the manual pages, which have their own license The website is available under the terms of the GPL-3.0 Using mandoc for the conversion of manual pages. Specified in the corresponding Arch Linux package.A hash is a one way operation that is performed on a block of data to create a unique hash value that represents the contents of the data. No matter when the hash is performed, the same hashing algorithm performed on the same data will always produce the same hash value. If any of the data changes, the hash value will change appropriately. Hashes are not useful for encrypting data because they are not intended to be used to reproduce the original data from the hash value. Hashes are most useful to verify the integrity of the data when used with an asymmetric signing algorithm. For example, if you hashed a text message, signed the hash, and included the signed hash value with the original message, the recipient could verify the signed hash, create the hash value for the received message, and then compare this hash value with the signed hash value included with the original message. If the two hash values are identical, the recipient can be reasonably sure that the original message has not been modified. The size of the hash value is fixed for a particular hashing algorithm. What this means is that no matter how large or small the data block is, the hash value will always be the same size. To create a hash using CNG, perform the following steps: As an example, the SHA256 hashing algorithm has a hash value size of 256 bits. Open an algorithm provider that supports the desired algorithm. Typical hashing algorithms include MD2, MD4, MD5, SHA-1, and SHA256. ![]() Call the BCryptOpenAlgorithmProvider function and specify the appropriate algorithm identifier in the pszAlgId parameter. ![]() Create the object by calling the BCryptCreateHash function.Allocate memory to hold the hash object.Obtain the size of the object by calling the BCryptGetProperty function to retrieve the BCRYPT_OBJECT_LENGTH property.Perform the following steps to create the hashing object: The function returns a handle to the provider. This involves calling the BCryptHashData function one or more times.
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