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