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"""
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()
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