# Path: axolotl/kdf/hkdf.py
# class HKDF(object):
#     __metaclass__ = abc.ABCMeta
#     HASH_OUTPUT_SIZE = 32
# 
#     @staticmethod
#     def createFor(messageVersion):
#         from .hkdfv2 import HKDFv2
#         from .hkdfv3 import HKDFv3
# 
#         if messageVersion == 2:
#             return HKDFv2()
#         elif messageVersion == 3:
#             return HKDFv3()
#         else:
#             raise AssertionError("Unknown version: %s " % messageVersion)
# 
#     def deriveSecrets(self, inputKeyMaterial, info, outputLength, salt=None):
#         salt = salt or bytearray(self.__class__.HASH_OUTPUT_SIZE)
#         prk = self.extract(salt, inputKeyMaterial)
#         return self.expand(prk, info, outputLength)
# 
#     def extract(self, salt, inputKeyMaterial):
#         mac = hmac.new(bytes(salt), digestmod=hashlib.sha256)
#         mac.update(bytes(inputKeyMaterial))
#         return mac.digest()
# 
#     def expand(self, prk, info, outputSize):
#         iterations = int(math.ceil(float(outputSize) / float(self.__class__.HASH_OUTPUT_SIZE)))
#         mixin = bytearray()
#         results = bytearray()
#         remainingBytes = outputSize
# 
#         for i in range(self.getIterationStartOffset(), iterations + self.getIterationStartOffset()):
#             mac = hmac.new(prk, digestmod=hashlib.sha256)
#             mac.update(bytes(mixin))
#             if info is not None:
#                 mac.update(bytes(info))
#             updateChr = chr(i % 256)
#             mac.update(updateChr.encode())
# 
#             stepResult = mac.digest()
#             stepSize = min(remainingBytes, len(stepResult))
#             results.extend(stepResult[:stepSize])
#             mixin = stepResult
#             remainingBytes -= stepSize
# 
#         return bytes(results)
# 
#     @abc.abstractmethod
#     def getIterationStartOffset(self):
#         return 0


import unittest
from ...kdf.hkdf import HKDF

class HKDFTest(unittest.TestCase):
    def test_vectorV3(self):
        ikm = bytearray([0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
                         0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b])

        salt = bytearray([0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c])

        info = bytearray([0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9])

        okm = bytearray([0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a, 0x90, 0x43, 0x4f, 0x64, 0xd0, 0x36, 0x2f,
                         0x2a, 0x2d, 0x2d, 0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c, 0x5d, 0xb0, 0x2d, 0x56, 0xec, 0xc4,
                         0xc5, 0xbf, 0x34, 0x00, 0x72, 0x08, 0xd5, 0xb8, 0x87, 0x18, 0x58, 0x65])

        actualOutput = HKDF.createFor(3).deriveSecrets(ikm, info, 42, salt=salt)
        self.assertEqual(okm, actualOutput)

    def test_vectorLongV3(self):
        ikm = bytearray([0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
                         0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d,
                         0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
                         0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
                         0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
                         0x4b, 0x4c, 0x4d, 0x4e, 0x4f])

        salt = bytearray([0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
                          0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d,
                          0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c,
                          0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
                          0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,

# Path: axolotl/kdf/hkdf.py
# class HKDF(object):
#     __metaclass__ = abc.ABCMeta
#     HASH_OUTPUT_SIZE = 32
# 
#     @staticmethod
#     def createFor(messageVersion):
#         from .hkdfv2 import HKDFv2
#         from .hkdfv3 import HKDFv3
# 
#         if messageVersion == 2:
#             return HKDFv2()
#         elif messageVersion == 3:
#             return HKDFv3()
#         else:
#             raise AssertionError("Unknown version: %s " % messageVersion)
# 
#     def deriveSecrets(self, inputKeyMaterial, info, outputLength, salt=None):
#         salt = salt or bytearray(self.__class__.HASH_OUTPUT_SIZE)
#         prk = self.extract(salt, inputKeyMaterial)
#         return self.expand(prk, info, outputLength)
# 
#     def extract(self, salt, inputKeyMaterial):
#         mac = hmac.new(bytes(salt), digestmod=hashlib.sha256)
#         mac.update(bytes(inputKeyMaterial))
#         return mac.digest()
# 
#     def expand(self, prk, info, outputSize):
#         iterations = int(math.ceil(float(outputSize) / float(self.__class__.HASH_OUTPUT_SIZE)))
#         mixin = bytearray()
#         results = bytearray()
#         remainingBytes = outputSize
# 
#         for i in range(self.getIterationStartOffset(), iterations + self.getIterationStartOffset()):
#             mac = hmac.new(prk, digestmod=hashlib.sha256)
#             mac.update(bytes(mixin))
#             if info is not None:
#                 mac.update(bytes(info))
#             updateChr = chr(i % 256)
#             mac.update(updateChr.encode())
# 
#             stepResult = mac.digest()
#             stepSize = min(remainingBytes, len(stepResult))
#             results.extend(stepResult[:stepSize])
#             mixin = stepResult
#             remainingBytes -= stepSize
# 
#         return bytes(results)
# 
#     @abc.abstractmethod
#     def getIterationStartOffset(self):
#         return 0


# Path: axolotl/tests/kdf/test_hkdf.py
import unittest
from ...kdf.hkdf import HKDF


class HKDFTest(unittest.TestCase):
    def test_vectorV3(self):
        ikm = bytearray([0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
                         0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b])

        salt = bytearray([0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c])

        info = bytearray([0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9])

        okm = bytearray([0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a, 0x90, 0x43, 0x4f, 0x64, 0xd0, 0x36, 0x2f,
                         0x2a, 0x2d, 0x2d, 0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c, 0x5d, 0xb0, 0x2d, 0x56, 0xec, 0xc4,
                         0xc5, 0xbf, 0x34, 0x00, 0x72, 0x08, 0xd5, 0xb8, 0x87, 0x18, 0x58, 0x65])

        actualOutput = HKDF.createFor(3).deriveSecrets(ikm, info, 42, salt=salt)
        self.assertEqual(okm, actualOutput)

    def test_vectorLongV3(self):
        ikm = bytearray([0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
                         0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d,
                         0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
                         0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
                         0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
                         0x4b, 0x4c, 0x4d, 0x4e, 0x4f])

        salt = bytearray([0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
                          0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d,
                          0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c,
                          0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
                          0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,

                          0xab, 0xac, 0xad, 0xae, 0xaf])