Updated DB_Helper by adding firebase methods.

venv/Lib/site-packages/Crypto/Hash/SHA256.py

@@ -0,0 +1,173 @@
+# -*- coding: utf-8 -*-
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+"""SHA-256 cryptographic hash algorithm.
+
+SHA-256 belongs to the SHA-2_ family of cryptographic hashes.
+It produces the 256 bit digest of a message.
+
+    >>> from Crypto.Hash import SHA256
+    >>>
+    >>> h = SHA256.new()
+    >>> h.update(b'Hello')
+    >>> print h.hexdigest()
+
+*SHA* stands for Secure Hash Algorithm.
+
+.. _SHA-2: http://csrc.nist.gov/publications/fips/fips180-2/fips180-4.pdf
+"""
+
+from Crypto.Util.py3compat import *
+
+from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
+                                  VoidPointer, SmartPointer,
+                                  create_string_buffer,
+                                  get_raw_buffer, c_size_t,
+                                  expect_byte_string)
+
+_raw_sha256_lib = load_pycryptodome_raw_lib("Crypto.Hash._SHA256",
+                        """
+                        int SHA256_init(void **shaState);
+                        int SHA256_destroy(void *shaState);
+                        int SHA256_update(void *hs,
+                                          const uint8_t *buf,
+                                          size_t len);
+                        int SHA256_digest(const void *shaState,
+                                          uint8_t digest[32]);
+                        int SHA256_copy(const void *src, void *dst);
+                        """)
+
+class SHA256Hash(object):
+    """Class that implements a SHA-256 hash
+    """
+
+    #: The size of the resulting hash in bytes.
+    digest_size = 32
+    #: The internal block size of the hash algorithm in bytes.
+    block_size = 64
+    #: ASN.1 Object ID
+    oid = "2.16.840.1.101.3.4.2.1"
+
+    def __init__(self, data=None):
+        state = VoidPointer()
+        result = _raw_sha256_lib.SHA256_init(state.address_of())
+        if result:
+            raise ValueError("Error %d while instantiating SHA256"
+                             % result)
+        self._state = SmartPointer(state.get(),
+                                   _raw_sha256_lib.SHA256_destroy)
+        if data:
+            self.update(data)
+
+    def update(self, data):
+        """Continue hashing of a message by consuming the next chunk of data.
+
+        Repeated calls are equivalent to a single call with the concatenation
+        of all the arguments. In other words:
+
+           >>> m.update(a); m.update(b)
+
+        is equivalent to:
+
+           >>> m.update(a+b)
+
+        :Parameters:
+          data : byte string
+            The next chunk of the message being hashed.
+        """
+
+        expect_byte_string(data)
+        result = _raw_sha256_lib.SHA256_update(self._state.get(),
+                                               data,
+                                               c_size_t(len(data)))
+        if result:
+            raise ValueError("Error %d while instantiating SHA256"
+                             % result)
+
+    def digest(self):
+        """Return the **binary** (non-printable) digest of the message that has been hashed so far.
+
+        This method does not change the state of the hash object.
+        You can continue updating the object after calling this function.
+
+        :Return: A byte string of `digest_size` bytes. It may contain non-ASCII
+         characters, including null bytes.
+        """
+
+        bfr = create_string_buffer(self.digest_size)
+        result = _raw_sha256_lib.SHA256_digest(self._state.get(),
+                                               bfr)
+        if result:
+            raise ValueError("Error %d while instantiating SHA256"
+                             % result)
+
+        return get_raw_buffer(bfr)
+
+    def hexdigest(self):
+        """Return the **printable** digest of the message that has been hashed so far.
+
+        This method does not change the state of the hash object.
+
+        :Return: A string of 2* `digest_size` characters. It contains only
+         hexadecimal ASCII digits.
+        """
+
+        return "".join(["%02x" % bord(x) for x in self.digest()])
+
+    def copy(self):
+        """Return a copy ("clone") of the hash object.
+
+        The copy will have the same internal state as the original hash
+        object.
+        This can be used to efficiently compute the digests of strings that
+        share a common initial substring.
+
+        :Return: A hash object of the same type
+        """
+
+        clone = SHA256Hash()
+        result = _raw_sha256_lib.SHA256_copy(self._state.get(),
+                                             clone._state.get())
+        if result:
+            raise ValueError("Error %d while copying SHA256" % result)
+        return clone
+
+    def new(self, data=None):
+        return SHA256Hash(data)
+
+def new(data=None):
+    """Return a fresh instance of the hash object.
+
+    :Parameters:
+       data : byte string
+        The very first chunk of the message to hash.
+        It is equivalent to an early call to `SHA256Hash.update()`.
+        Optional.
+
+    :Return: A `SHA256Hash` object
+    """
+    return SHA256Hash().new(data)
+
+#: The size of the resulting hash in bytes.
+digest_size = SHA256Hash.digest_size
+
+#: The internal block size of the hash algorithm in bytes.
+block_size = SHA256Hash.block_size
+