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DPP: Support retrieving of configurator's private key

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To retain configurator information across hostapd/wpa_supplicant
restart, private key need to be maintained to generate a valid pair of
authentication keys (connector, netaccess_key, csign) for new enrollees
in the network.

Add a DPP_CONFIGURATOR_GET_KEY control interface API through which the
private key of an existing configurator can be fetched.

Command format:
DPP_CONFIGURATOR_GET_KEY <configurator_id>

The output from this command can then be used with
"DPP_CONFIGURATOR_ADD key=<hexdump>" to create the same key again.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Purushottam Kushwaha 2018-03-16 15:34:21 +05:30 • committed by Jouni Malinen
parent 4bc801ab42
commit 8179ae3a2a
10 changed files with 83 additions and 0 deletions
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24
src/common/dpp.c
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@ -5510,6 +5510,30 @@ void dpp_configurator_free(struct dpp_configurator *conf)
}
int dpp_configurator_get_key(const struct dpp_configurator *conf, char *buf,
size_t buflen)
{
EC_KEY *eckey;
int key_len, ret = -1;
unsigned char *key = NULL;
if (!conf->csign)
return -1;
eckey = EVP_PKEY_get1_EC_KEY(conf->csign);
if (!eckey)
return -1;
key_len = i2d_ECPrivateKey(eckey, &key);
if (key_len > 0)
ret = wpa_snprintf_hex(buf, buflen, key, key_len);
EC_KEY_free(eckey);
OPENSSL_free(key);
return ret;
}
struct dpp_configurator *
dpp_keygen_configurator(const char *curve, const u8 *privkey,
size_t privkey_len)