Updated DB_Helper by adding firebase methods.

venv/Lib/site-packages/Crypto/Util/strxor.py

@@ -0,0 +1,72 @@
+# ===================================================================
+#
+# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+"""
+Fast XOR of byte strings.
+"""
+
+from Crypto.Util._raw_api import (load_pycryptodome_raw_lib, c_size_t,
+                                  create_string_buffer, get_raw_buffer,
+                                  expect_byte_string)
+
+_raw_strxor = load_pycryptodome_raw_lib("Crypto.Util._strxor",
+                    """
+                    void strxor(const uint8_t *in1,
+                                const uint8_t *in2,
+                                uint8_t *out, size_t len);
+                    void strxor_c(const uint8_t *in,
+                                  uint8_t c,
+                                  uint8_t *out,
+                                  size_t len);
+                    """)
+
+
+def strxor(term1, term2):
+    """Return term1 xored with term2.
+    The two byte strings must have equal length."""
+
+    expect_byte_string(term1)
+    expect_byte_string(term2)
+    if len(term1) != len(term2):
+        raise ValueError("Only byte strings of equal length can be xored")
+    result = create_string_buffer(len(term1))
+    _raw_strxor.strxor(term1, term2, result, c_size_t(len(term1)))
+    return get_raw_buffer(result)
+
+
+def strxor_c(term, c):
+    """Return term xored with a sequence of characters c."""
+
+    expect_byte_string(term)
+    if not 0 <= c < 256:
+        raise ValueError("c must be in range(256)")
+    result = create_string_buffer(len(term))
+    _raw_strxor.strxor_c(term, c, result, c_size_t(len(term)))
+    return get_raw_buffer(result)