Package Crypto :: Package Hash :: Module SHA256 :: Class SHA256Hash

Class SHA256Hash

hashalgo.HashAlgo --+
                    |
                   SHA256Hash

Class that implements a SHA-256 hash

Instance Methods

__init__(self, data=None)
Initialize the hash object.

new(self, data=None)
Return a fresh instance of the hash object.

Inherited from hashalgo.HashAlgo

copy(self)
Return a copy ("clone") of the hash object.

digest(self)
Return the binary (non-printable) digest of the message that has been hashed so far.

hexdigest(self)
Return the printable digest of the message that has been hashed so far.

update(self, data)
Continue hashing of a message by consuming the next chunk of data.

Class Variables
	oid = '\x06\t`\x86H\x01e\x03\x04\x02\x01' ASN.1 Object identifier (OID):
	digest_size = `32` The size of the resulting hash in bytes.

Method Details

init(self, data=None)
(Constructor)

Initialize the hash object.

Parameters:

hashFactory - An object that will generate the actual hash implementation. hashFactory must have a new() method, or must be directly callable.
data - The very first chunk of the message to hash. It is equivalent to an early call to update().

Overrides: hashalgo.HashAlgo.__init__

(inherited documentation)

new(self, data=None)

Return a fresh instance of the hash object.

Unlike the copy method, the internal state of the object is empty.

Parameters:

data - The next chunk of the message being hashed.

Returns:

A hash object of the same type

Overrides: hashalgo.HashAlgo.new

(inherited documentation)

Class Variable Details

oid

ASN.1 Object identifier (OID):

id-sha256    OBJECT IDENTIFIER ::= {
           joint-iso-itu-t(2) country(16) us(840) organization(1)
            gov(101) csor(3) nistalgorithm(4) hashalgs(2) 1
}

This value uniquely identifies the SHA-256 algorithm.

Value:

'\x06\t`\x86H\x01e\x03\x04\x02\x01'

Class SHA256Hash

__init__(self, data=None) (Constructor)

new(self, data=None)

oid

init(self, data=None)
(Constructor)