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tests.py
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tests.py
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# coding=utf8
#
# Tests for hkdf.py. Run with Nose.
#
from __future__ import print_function
import hkdf
import codecs
import hashlib
from binascii import hexlify, unhexlify
import sys
if sys.version_info[0] == 2:
from UserDict import IterableUserDict as UserDict
else:
from collections import UserDict
try:
from nose.tools import assert_equals
except ImportError as e:
def assert_equals(a, b):
'''
Assert a and b are equal.
Assume a and b are raw binary data and escape before printing.
'''
try:
assert a == b
except AssertionError:
print("AssertionError: {a} != {b}".format(a=a.encode("hex"), b=b.encode("hex")))
raise
class TestCase(UserDict):
'''Pretty print test cases'''
def __str__(self):
def format_(bytes_, max_len=4):
'''Convert byte sequence to shortened hex unicode for printing'''
if bytes_ is None:
return u"None"
else:
return u'"{prefix}{rest}"'.format(
prefix=hexlify(bytes_[:max_len]),
rest=u"..." if len(bytes_) > max_len else u""
)
return u"""{name} ({algo}, IKM={ikm_start}, salt={salt_start})""".format(
name=self.get("name", u"Unnamed test case"),
algo=self["hash"]().name,
ikm_start=format_(self["IKM"]),
salt_start=format_(self["salt"])
)
__repr__ = __str__
def decode_hex(s):
return codecs.decode(s, "hex_codec")
#### HKDF test vectors from draft RFC
test_vectors = {}
# A.1. Test Case 1
# Basic test tv_number with SHA-256
test_vectors[1] = TestCase({
"name" : "A.1 Test Case 1",
"hash" : hashlib.sha256,
"IKM" : decode_hex("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
"salt" : decode_hex("000102030405060708090a0b0c"),
"info" : decode_hex("f0f1f2f3f4f5f6f7f8f9"),
"L" : 42,
"PRK" : decode_hex("077709362c2e32df0ddc3f0dc47bba6390b6c73bb50f9c3122ec844ad7c2b3e5"),
"OKM" : decode_hex("3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1a5a4c5db02d56ecc4c5bf34007208d5b887185865"),
})
# A.2. Test Case 2
# Test with SHA-256 and longer inputs/outputs
test_vectors[2] = TestCase({
"name" : "A.2 Test Case 2",
"hash" : hashlib.sha256,
"IKM" : decode_hex("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f"),
"salt" : decode_hex("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeaf"),
"info" : decode_hex("b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff"),
"L" : 82,
"PRK" : decode_hex("06a6b88c5853361a06104c9ceb35b45cef760014904671014a193f40c15fc244"),
"OKM" : decode_hex("b11e398dc80327a1c8e7f78c596a49344f012eda2d4efad8a050cc4c19afa97c59045a99cac7827271cb41c65e590e09da3275600c2f09b8367793a9aca3db71cc30c58179ec3e87c14c01d5c1f3434f1d87"),
})
# A.3. Test Case 3
# Test with SHA-256 and zero-length salt/info
test_vectors[3] = TestCase({
"name" : "A.3 Test Case 3",
"hash" : hashlib.sha256,
"IKM" : decode_hex("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
"salt" : b"",
"info" : b"",
"L" : 42,
"PRK" : decode_hex("19ef24a32c717b167f33a91d6f648bdf96596776afdb6377ac434c1c293ccb04"),
"OKM" : decode_hex("8da4e775a563c18f715f802a063c5a31b8a11f5c5ee1879ec3454e5f3c738d2d9d201395faa4b61a96c8"),
})
# A.4. Test Case 4
# Basic test tv_number with SHA-1
test_vectors[4] = TestCase({
"name" : "A.4 Test Case 4",
"hash" : hashlib.sha1,
"IKM" : decode_hex("0b0b0b0b0b0b0b0b0b0b0b"),
"salt" : decode_hex("000102030405060708090a0b0c"),
"info" : decode_hex("f0f1f2f3f4f5f6f7f8f9"),
"L" : 42,
"PRK" : decode_hex("9b6c18c432a7bf8f0e71c8eb88f4b30baa2ba243"),
"OKM" : decode_hex("085a01ea1b10f36933068b56efa5ad81a4f14b822f5b091568a9cdd4f155fda2c22e422478d305f3f896"),
})
# A.5. Test Case 5
# Test with SHA-1 and longer inputs/outputs
test_vectors[5] = TestCase({
"name" : "A.5 Test Case 5",
"hash" : hashlib.sha1,
"IKM" : decode_hex("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f"),
"salt" : decode_hex("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeaf"),
"info" : decode_hex("b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff"),
"L" : 82,
"PRK" : decode_hex("8adae09a2a307059478d309b26c4115a224cfaf6"),
"OKM" : decode_hex("0bd770a74d1160f7c9f12cd5912a06ebff6adcae899d92191fe4305673ba2ffe8fa3f1a4e5ad79f3f334b3b202b2173c486ea37ce3d397ed034c7f9dfeb15c5e927336d0441f4c4300e2cff0d0900b52d3b4"),
})
# A.6. Test Case 6
# Test with SHA-1 and zero-length salt/info
test_vectors[6] = TestCase({
"name" : "A.6 Test Case 6",
"hash" : hashlib.sha1,
"IKM" : decode_hex("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
"salt" : b"",
"info" : b"",
"L" : 42,
"PRK" : decode_hex("da8c8a73c7fa77288ec6f5e7c297786aa0d32d01"),
"OKM" : decode_hex("0ac1af7002b3d761d1e55298da9d0506b9ae52057220a306e07b6b87e8df21d0ea00033de03984d34918"),
})
# A.7. Test Case 7
# Test with SHA-1, salt not provided (defaults to HashLen zero octets),
# zero-length info
test_vectors[7] = TestCase({
"name" : "A.7 Test Case 7",
"hash" : hashlib.sha1,
"IKM" : decode_hex("0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c"),
"salt" : None,
"info" : b"",
"L" : 42,
"PRK" : decode_hex("2adccada18779e7c2077ad2eb19d3f3e731385dd"),
"OKM" : decode_hex("2c91117204d745f3500d636a62f64f0ab3bae548aa53d423b0d1f27ebba6f5e5673a081d70cce7acfc48"),
})
#### test helpers
def tv_extract(tv_number):
tv = test_vectors[tv_number]
return hkdf.hkdf_extract(tv["salt"], tv["IKM"], tv["hash"])
def tv_expand(tv_number):
tv = test_vectors[tv_number]
test_prk = hkdf.hkdf_extract(tv["salt"], tv["IKM"], tv["hash"])
return hkdf.hkdf_expand(test_prk, tv["info"], tv["L"], tv["hash"])
#### Nose test functions
def test_functional_interface():
for tv in test_vectors.values():
yield check_fun_tv, tv
def test_wrapper_class():
for tv in test_vectors.values():
yield check_class_tv, tv
def check_fun_tv(tv):
'''
Generate and check HKDF pseudorandom key and output key material for a specific test vector
PRK = HKDF-Extract([test vector values])
OKM = HKDF-Expand(PRK, [test vector values])
'''
test_prk = hkdf.hkdf_extract(tv["salt"], tv["IKM"], tv["hash"])
test_okm = hkdf.hkdf_expand(test_prk, tv["info"], tv["L"], tv["hash"])
print("%s" % tv)
print("PRK: %s" % ("match" if test_prk == tv["PRK"] else "FAIL"))
print("OKM: %s" % ("match" if test_okm == tv["OKM"] else "FAIL"))
print
assert_equals(test_prk, tv["PRK"])
assert_equals(test_okm, tv["OKM"])
def check_class_tv(tv):
'''Test HKDF output via wrapper class'''
kdf = hkdf.Hkdf(tv["salt"], tv["IKM"], tv["hash"])
test_okm = kdf.expand(tv["info"], tv["L"])
print("%s (via wrapper class)" % tv)
print("PRK: %s" % ("match" if kdf._prk == tv["PRK"] else "FAIL"))
print("OKM: %s" % ("match" if test_okm == tv["OKM"] else "FAIL"))
print()
assert_equals(kdf._prk, tv["PRK"])
assert_equals(test_okm, tv["OKM"])
if __name__ == "__main__":
for f, tv in test_functional_interface():
f(tv)
for f, tv in test_wrapper_class():
f(tv)