SHA2 secure hash¶
This module implements the interface to NIST’s secure hash algorithm, known as SHA-2. It is used in the same way as all crypto hash modules: an instance of the SHA2 class is created, then feed this object with arbitrary strings/bytes using the update() method, and at any point you can ask it for the digest of the concatenation of the strings fed to it so far.
The class supports 4 variants of SHA2, selectable in the constructor with one of the following constants:
The SHA2 class¶
This class allows the generation of SHA2 hashes. It is thread safe. By default, it calculates the SHA256 variant of SHA2. This behaviour can be changed by passing a different value for
update(data) Update the sha object with the string
data. Repeated calls are equivalent to a single call with the concatenation of all the arguments: m.update(a); m.update(b) is equivalent to m.update(a+b).
digest() Return the digest of the strings passed to the update method so far. This is a byte object with length depending on the SHA2 variant.
hexdigest() Like digest except the digest is returned as a string containing only hexadecimal digits.