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Read remote ECDH Key

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This commit is contained in:
Florian Märkl 2018-11-25 19:09:18 +01:00
commit 6eba5af333
No known key found for this signature in database
GPG key ID: 125BC8A5A6A1E857
3 changed files with 47 additions and 0 deletions
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1
lib/include/chiaki/ecdh.h
View file

@ -36,6 +36,7 @@ typedef struct chiaki_ecdh_t
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_init(ChiakiECDH *ecdh);
CHIAKI_EXPORT void chiaki_ecdh_fini(ChiakiECDH *ecdh);
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_get_local_pub_key(ChiakiECDH *ecdh, uint8_t *key_out, size_t *key_out_size, uint8_t *handshake_key, uint8_t *sig_out, size_t *sig_out_size);
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_t *remote_key, size_t remote_key_size, uint8_t *handshake_key, uint8_t *remote_sig, size_t remote_sig_size);
#ifdef __cplusplus
}

41
lib/src/ecdh.c
View file

@ -65,5 +65,46 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_get_local_pub_key(ChiakiECDH *ecdh, ui
if(!HMAC(EVP_sha256(), handshake_key, CHIAKI_HANDSHAKE_KEY_SIZE, key_out, *key_out_size, sig_out, (unsigned int *)sig_out_size))
return CHIAKI_ERR_UNKNOWN;
return CHIAKI_ERR_SUCCESS;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_t *remote_key, size_t remote_key_size, uint8_t *handshake_key, uint8_t *remote_sig, size_t remote_sig_size)
{
EC_POINT *point = EC_POINT_new(ecdh->group);
if(!point)
return CHIAKI_ERR_UNKNOWN;
if(!EC_POINT_oct2point(ecdh->group, point, remote_key, remote_key_size, NULL))
{
EC_POINT_free(point);
return CHIAKI_ERR_UNKNOWN;
}
EC_KEY *remote_ec_key = EC_KEY_new();
if(!remote_ec_key)
{
EC_POINT_free(point);
return CHIAKI_ERR_UNKNOWN;
}
if(!EC_KEY_set_group(remote_ec_key, ecdh->group))
{
EC_KEY_free(remote_ec_key);
EC_POINT_free(point);
return CHIAKI_ERR_UNKNOWN;
}
if(!EC_KEY_set_public_key(remote_ec_key, point))
{
EC_KEY_free(remote_ec_key);
EC_POINT_free(point);
return CHIAKI_ERR_UNKNOWN;
}
EC_POINT_free(point);
// TODO: do derivation
EC_KEY_free(remote_ec_key);
return CHIAKI_ERR_SUCCESS;
}

5
lib/src/nagare.c
View file

@ -200,6 +200,11 @@ static void nagare_takion_data_expect_bang(ChiakiNagare *nagare, uint8_t *buf, s
CHIAKI_LOGI(nagare->log, "Nagare bang looks good so far\n");
chiaki_ecdh_derive_secret(&nagare->session->ecdh,
ecdh_pub_key_buf.buf, ecdh_pub_key_buf.size,
nagare->session->handshake_key,
ecdh_sig_buf.buf, ecdh_sig_buf.size);
error:
chiaki_mirai_signal(&nagare->bang_mirai, true);
}