tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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gen-keys.py (1400B)

      1 # This Source Code Form is subject to the terms of the Mozilla Public
      2 # License, v. 2.0. If a copy of the MPL was not distributed with this
      3 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
      4 
      5 import sys
      6 
      7 from pyasn1.codec.der import decoder
      8 from pyasn1.type import univ
      9 from pyasn1_modules import pem
     10 
     11 
     12 def public_key_to_string(file, name):
     13    out = "static const unsigned char " + name + "[65] = { "
     14    with open(file) as f:
     15        substrate = pem.readPemFromFile(
     16            f, "-----BEGIN PUBLIC KEY-----", "-----END PUBLIC KEY-----"
     17        )
     18        key = decoder.decode(substrate)
     19        ident = key[0][0]
     20        assert ident[0] == univ.ObjectIdentifier("1.2.840.10045.2.1"), (
     21            "should be an ECPublicKey"
     22        )
     23        assert ident[1] == univ.ObjectIdentifier("1.2.840.10045.3.1.7"), (
     24            "should be a EcdsaP256 key"
     25        )
     26        bits = key[0][1]
     27        assert isinstance(bits, univ.BitString), "Should be a bit string"
     28        assert len(bits) == 520, "Should be 520 bits (65 bytes)"
     29        for byte in bits.asOctets():
     30            out += hex(byte) + ", "
     31    out += "};"
     32    return out
     33 
     34 
     35 def generate(output, test_key, prod_key):
     36    output.write(public_key_to_string(test_key, "kTestKey"))
     37    output.write("\n\n")
     38    output.write(public_key_to_string(prod_key, "kProdKey"))
     39 
     40 
     41 if __name__ == "__main__":
     42    generate(sys.stdout, *sys.argv[1:])