From e66818326ec2dbbe731ad3fe0e6aaedba67f8a45 Mon Sep 17 00:00:00 2001 From: Alexander Bersenev Date: Mon, 19 Aug 2019 17:48:10 +0500 Subject: [PATCH] generate plausible keys in the key share extension --- mtprotoproxy.py | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mtprotoproxy.py b/mtprotoproxy.py index e5916f2..286ac6c 100755 --- a/mtprotoproxy.py +++ b/mtprotoproxy.py @@ -1491,6 +1491,12 @@ async def make_https_req(url, host="core.telegram.org"): def gen_tls_client_hello_msg(server_name): + def gen_x25519_public_key(): + # generates some number which has square root by modulo P + P = 2**255 - 19 + n = random.randrange(P) + return int.to_bytes((n*n) % P, length=32, byteorder="little") + msg = bytearray(b"\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03") msg += bytes([random.randrange(0, 256) for i in range(32)]) msg += b"\x20" @@ -1506,8 +1512,7 @@ def gen_tls_client_hello_msg(server_name): msg += b"\x68\x32\x08\x68\x74\x74\x70\x2f\x31\x2e\x31\x00\x05\x00\x05\x01\x00\x00\x00\x00" msg += b"\x00\x0d\x00\x14\x00\x12\x04\x03\x08\x04\x04\x01\x05\x03\x08\x05\x05\x01\x08\x06" msg += b"\x06\x01\x01\x01\x00\x12\x00\x00\x00\x33\x00\x2b\x00\x29\xaa\xaa\x00\x01\x00\x00" - msg += b"\x1d\x00\x20" - msg += bytes([random.randrange(0, 256) for i in range(32)]) + msg += b"\x1d\x00\x20" + gen_x25519_public_key() msg += b"\x00\x2d\x00\x02\x01\x01\x00\x2b\x00\x0b\x0a\xba\xba\x03\x04\x03\x03\x03\x02\x03" msg += b"\x01\x00\x1b\x00\x03\x02\x00\x02\x3a\x3a\x00\x01\x00\x00\x15" msg += int.to_bytes(517 - len(msg) - 2, 2, "big")