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import hashlib
import hmac
import sys
if sys.version_info[0] == 2:
text_type = unicode
else:
text_type = str
class Crypto:
@staticmethod
def sha1_hmac_hash(secret_key, content):
if isinstance(secret_key, text_type):
secret_key = secret_key.encode('ascii')
if isinstance(content, text_type):
content = content.encode('ascii')
return hmac.new(hashlib.sha1(secret_key).digest(), content, hashlib.sha1).hexdigest()
@staticmethod
def sha256_hmac_hash(secret_key, content):
if isinstance(secret_key, text_type):
secret_key = secret_key.encode('ascii')
if isinstance(content, text_type):
content = content.encode('ascii')
return hmac.new(hashlib.sha256(secret_key).digest(), content, hashlib.sha256).hexdigest()
@staticmethod
def secure_compare(left, right):
if left == None or right == None:
return False
left_bytes = [ord(char) for char in left]
right_bytes = [ord(char) for char in right]
if len(left_bytes) != len(right_bytes):
return False
result = 0
for left_byte, right_byte in zip(left_bytes, right_bytes):
result |= left_byte ^ right_byte
return result == 0
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