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implement secmod cs derive R

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Lucien Heuzeveldt 2022-01-04 12:21:58 +01:00 committed by Gian Demarmels
parent d1fd3a485b
commit 875a8b397e
No known key found for this signature in database
GPG Key ID: 030CEDDCCC92D778
2 changed files with 111 additions and 2 deletions
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103
src/util/taler-exchange-secmod-cs.c
View File

@ -565,6 +565,100 @@ handle_revoke_request (struct TES_Client *client,
}
/**
* Handle @a client request @a sr to create signature. Create the
* signature using the respective key and return the result to
* the client.
*
* @param client the client making the request
* @param sr the request details
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
handle_r_derive_request (struct TES_Client *client,
const struct TALER_CRYPTO_CsRDeriveRequest *rdr)
{
struct DenominationKey *dk;
struct TALER_DenominationCsPrivateR r_priv;
struct TALER_DenominationCsPublicR r_pub;
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
GNUNET_assert (0 == pthread_mutex_lock (&keys_lock));
dk = GNUNET_CONTAINER_multihashmap_get (keys,
&rdr->h_cs.hash);
if (NULL == dk)
{
struct TALER_CRYPTO_RDeriveFailure rdf = {
.header.size = htons (sizeof (rdr)),
.header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE_FAILURE),
.ec = htonl (TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN)
};
GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock));
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"R Derive request failed, denomination key %s unknown\n",
GNUNET_h2s (&rdr->h_cs.hash));
return TES_transmit (client->csock,
&rdf.header);
}
if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time))
{
/* it is too early */
struct TALER_CRYPTO_RDeriveFailure rdf = {
.header.size = htons (sizeof (rdr)),
.header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE_FAILURE),
.ec = htonl (TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY)
};
GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock));
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"R Derive request failed, denomination key %s is not yet valid\n",
GNUNET_h2s (&rdr->h_cs.hash));
return TES_transmit (client->csock,
&rdf.header);
}
// TODO: print nonce too?
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Received request to derive R with key %s\n",
GNUNET_h2s (&rdr->h_cs.hash));
GNUNET_assert (dk->rc < UINT_MAX);
dk->rc++;
GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock));
GNUNET_CRYPTO_cs_r_derive (&rdr->nonce.nonce,
&dk->denom_priv,
r_priv.r);
GNUNET_CRYPTO_cs_r_get_public (&r_priv.r[0], &r_pub.r_pub[0]);
GNUNET_CRYPTO_cs_r_get_public (&r_priv.r[1], &r_pub.r_pub[1]);
GNUNET_assert (0 == pthread_mutex_lock (&keys_lock));
GNUNET_assert (dk->rc > 0);
dk->rc--;
GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock));
{
struct TALER_CRYPTO_RDeriveResponse rdr;
enum GNUNET_GenericReturnValue ret;
rdr.header.size = htons (sizeof (struct TALER_CRYPTO_RDeriveResponse));
rdr.header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE);
rdr.r_pub = r_pub;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Sending CS Derived R after %s\n",
GNUNET_TIME_relative2s (
GNUNET_TIME_absolute_get_duration (now),
GNUNET_YES));
ret = TES_transmit (client->csock,
&rdr.header);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Sent CS Derived R after %s\n",
GNUNET_TIME_relative2s (
GNUNET_TIME_absolute_get_duration (now),
GNUNET_YES));
return ret;
}
}
/**
* Handle @a hdr message received from @a client.
*
@ -598,6 +692,15 @@ cs_work_dispatch (struct TES_Client *client,
return handle_revoke_request (
client,
(const struct TALER_CRYPTO_CsRevokeRequest *) hdr);
case TALER_HELPER_CS_MT_RES_RDERIVE:
if (msize != sizeof (struct TALER_CRYPTO_CsRDeriveRequest))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return handle_r_derive_request (client,
(const struct
TALER_CRYPTO_CsRDeriveRequest *) hdr);
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;

10
src/util/taler-exchange-secmod-cs.h
View File

@ -156,7 +156,10 @@ struct TALER_CRYPTO_CsRDeriveRequest
*/
struct TALER_CsPubHashP h_cs;
/* followed by Withdraw nonce to derive R */
/**
* Withdraw nonce to derive R from
*/
struct TALER_WithdrawNonce nonce;
};
/**
@ -215,7 +218,10 @@ struct TALER_CRYPTO_RDeriveResponse
*/
uint32_t reserved;
/* followed by derived R */
/**
* derived R
*/
struct TALER_DenominationCsPublicR r_pub;
};