Synss
commented
3 years ago Hi zhongfelix!
I am afraid my library will not be very useful for ctypes. You should probably call into libmbedtls directly instead. Nevertheless, mbedtls_ecdh_gen_public() is wrapped as ECDHNaive.generate() of the mbedtls.pk module. You can use it to generate a public key with, for example,
import mbedtls
naive = mbedtls.pk.ECDHNaive()
pub = naive.generate() # <-- here, call to ecdh_gen_public, the public key is now in pubI have documented a full key exchanges using ECDH in the README (search for ECDHServer and ECDHClient).
Does that answer your question?
Cheers, Mathias
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Description
hi Synss, I want to specific argments p_rng for mbedtls_ecdh_gen_public, it's usually in c coding, but I can't find a way to do this with python-mbedtls.
thanks for your great work on python-mbedtls, it's very useful to me.
Current behavior
currently, I try to this in python code, but it always crash at so.mbedtls_ecdh_gen_public.
so = ctypes.CDLL("/usr/local/lib/python2.7/site-packages/mbedtls/pk.so") ecdh_ctx = (c_char_p 1024)(addressof(ctypes.create_string_buffer(1024))) d = (c_char_p 1024)(addressof(ctypes.create_string_buffer(1024))) Q = (c_char_p 1024)(addressof(ctypes.create_string_buffer(1024))) RNG = (c_char_p 1024)(addressof(ctypes.create_string_buffer(1024)))
so.mbedtls_ecdh_init(ecdh_ctx) so.mbedtls_mpi_init(d) so.mbedtls_ecp_point_init(Q) so.mbedtls_ctr_drbg_init(RNG)
so.mbedtls_ecp_group_load(ecdh_ctx, 9) so.mbedtls_ecdh_gen_public(ecdh_ctx, d, Q, so.mbedtls_ctr_drbg_random, RNG) print ecdh_ctx
Expected behavior
Steps to reproduce
1. 1. 1.
Minimal demo of the problem
Other information