InfiniTime/tools/mcuboot/imgtool/keys/ed25519_test.py

104 lines
2.9 KiB
Python

"""
Tests for ECDSA keys
"""
import hashlib
import io
import os.path
import sys
import tempfile
import unittest
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.primitives.asymmetric import ed25519
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '../..')))
from imgtool.keys import load, Ed25519, Ed25519UsageError
class Ed25519KeyGeneration(unittest.TestCase):
def setUp(self):
self.test_dir = tempfile.TemporaryDirectory()
def tname(self, base):
return os.path.join(self.test_dir.name, base)
def tearDown(self):
self.test_dir.cleanup()
def test_keygen(self):
name1 = self.tname("keygen.pem")
k = Ed25519.generate()
k.export_private(name1, b'secret')
self.assertIsNone(load(name1))
k2 = load(name1, b'secret')
pubname = self.tname('keygen-pub.pem')
k2.export_public(pubname)
pk2 = load(pubname)
# We should be able to export the public key from the loaded
# public key, but not the private key.
pk2.export_public(self.tname('keygen-pub2.pem'))
self.assertRaises(Ed25519UsageError,
pk2.export_private, self.tname('keygen-priv2.pem'))
def test_emit(self):
"""Basic sanity check on the code emitters."""
k = Ed25519.generate()
ccode = io.StringIO()
k.emit_c_public(ccode)
self.assertIn("ed25519_pub_key", ccode.getvalue())
self.assertIn("ed25519_pub_key_len", ccode.getvalue())
rustcode = io.StringIO()
k.emit_rust_public(rustcode)
self.assertIn("ED25519_PUB_KEY", rustcode.getvalue())
def test_emit_pub(self):
"""Basic sanity check on the code emitters."""
pubname = self.tname("public.pem")
k = Ed25519.generate()
k.export_public(pubname)
k2 = load(pubname)
ccode = io.StringIO()
k2.emit_c_public(ccode)
self.assertIn("ed25519_pub_key", ccode.getvalue())
self.assertIn("ed25519_pub_key_len", ccode.getvalue())
rustcode = io.StringIO()
k2.emit_rust_public(rustcode)
self.assertIn("ED25519_PUB_KEY", rustcode.getvalue())
def test_sig(self):
k = Ed25519.generate()
buf = b'This is the message'
sha = hashlib.sha256()
sha.update(buf)
digest = sha.digest()
sig = k.sign_digest(digest)
# The code doesn't have any verification, so verify this
# manually.
k.key.public_key().verify(signature=sig, data=digest)
# Modify the message to make sure the signature fails.
sha = hashlib.sha256()
sha.update(b'This is thE message')
new_digest = sha.digest()
self.assertRaises(InvalidSignature,
k.key.public_key().verify,
signature=sig,
data=new_digest)
if __name__ == '__main__':
unittest.main()