118 lines
3.7 KiB
Python
118 lines
3.7 KiB
Python
"""
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Tests for RSA keys
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"""
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# SPDX-License-Identifier: Apache-2.0
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import io
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import os
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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.padding import PSS, MGF1
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from cryptography.hazmat.primitives.hashes import SHA256
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# Setup sys path so 'imgtool' is in it.
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sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__),
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'../..')))
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from imgtool.keys import load, RSA, RSAUsageError
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from imgtool.keys.rsa import RSA_KEY_SIZES
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class KeyGeneration(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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# Try generating a RSA key with non-supported size
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with self.assertRaises(RSAUsageError):
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RSA.generate(key_size=1024)
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for key_size in RSA_KEY_SIZES:
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name1 = self.tname("keygen.pem")
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k = RSA.generate(key_size=key_size)
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k.export_private(name1, b'secret')
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# Try loading the key without a password.
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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(RSAUsageError, pk2.export_private,
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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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for key_size in RSA_KEY_SIZES:
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k = RSA.generate(key_size=key_size)
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ccode = io.StringIO()
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k.emit_c_public(ccode)
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self.assertIn("rsa_pub_key", ccode.getvalue())
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self.assertIn("rsa_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("RSA_PUB_KEY", rustcode.getvalue())
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def test_emit_pub(self):
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"""Basic sanity check on the code emitters, from public key."""
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pubname = self.tname("public.pem")
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for key_size in RSA_KEY_SIZES:
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k = RSA.generate(key_size=key_size)
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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("rsa_pub_key", ccode.getvalue())
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self.assertIn("rsa_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("RSA_PUB_KEY", rustcode.getvalue())
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def test_sig(self):
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for key_size in RSA_KEY_SIZES:
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k = RSA.generate(key_size=key_size)
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buf = b'This is the message'
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sig = k.sign(buf)
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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(
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signature=sig,
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data=buf,
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padding=PSS(mgf=MGF1(SHA256()), salt_length=32),
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algorithm=SHA256())
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# Modify the message to make sure the signature fails.
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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=b'This is thE message',
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padding=PSS(mgf=MGF1(SHA256()), salt_length=32),
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algorithm=SHA256())
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if __name__ == '__main__':
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unittest.main()
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