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handle 200 OK response from /withdraw/sign

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This commit is contained in:
Christian Grothoff 2015-06-22 20:38:35 +02:00
parent 57f4c31514
commit 9fbd7967b1
1 changed files with 94 additions and 12 deletions
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106
src/mint-lib/mint_api_withdraw.c
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@ -334,6 +334,16 @@ struct TALER_MINT_WithdrawSignHandle
*/
TALER_MINT_WithdrawSignResultCallback cb;
/**
* Key used to blind the value.
*/
const struct TALER_DenominationBlindingKey *blinding_key;
/**
* Denomination key we are withdrawing.
*/
const struct TALER_MINT_DenomPublicKey *pk;
/**
* Closure for @a cb.
*/
@ -344,6 +354,11 @@ struct TALER_MINT_WithdrawSignHandle
*/
void *buf;
/**
* Hash of the public key of the coin we are signing.
*/
struct GNUNET_HashCode c_hash;
/**
* The size of the download buffer
*/
@ -358,6 +373,64 @@ struct TALER_MINT_WithdrawSignHandle
};
/**
* We got a 200 OK response for the /withdraw/sign operation.
* Extract the coin's signature and return it to the caller.
* The signature we get from the mint is for the blinded value.
* Thus, we first must unblind it and then should verify its
* validity against our coin's hash.
*
* If everything checks out, we return the unblinded signature
* to the application via the callback.
*
* @param wsh operation handle
* @param json reply from the mint
* @return #GNUNET_OK on success, #GNUNET_SYSERR on errors
*/
static int
withdraw_sign_ok (struct TALER_MINT_WithdrawSignHandle *wsh,
json_t *json)
{
struct GNUNET_CRYPTO_rsa_Signature *blind_sig;
struct GNUNET_CRYPTO_rsa_Signature *sig;
struct TALER_DenominationSignature dsig;
struct MAJ_Specification spec[] = {
MAJ_spec_fixed_auto ("ev_sig", &blind_sig),
MAJ_spec_end
};
if (GNUNET_OK !=
MAJ_parse_json (json,
spec))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
sig = GNUNET_CRYPTO_rsa_unblind (blind_sig,
wsh->blinding_key->rsa_blinding_key,
wsh->pk->key.rsa_public_key);
GNUNET_CRYPTO_rsa_signature_free (blind_sig);
if (GNUNET_OK !=
GNUNET_CRYPTO_rsa_verify (&wsh->c_hash,
sig,
wsh->pk->key.rsa_public_key))
{
GNUNET_break_op (0);
GNUNET_CRYPTO_rsa_signature_free (sig);
return GNUNET_SYSERR;
}
/* signature is valid, return it to the application */
dsig.rsa_signature = sig;
wsh->cb (wsh->cb_cls,
MHD_HTTP_OK,
&dsig,
json);
/* make sure callback isn't called again after return */
wsh->cb = NULL;
GNUNET_CRYPTO_rsa_signature_free (sig);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
@ -402,7 +475,13 @@ handle_withdraw_sign_finished (void *cls,
switch (response_code)
{
case MHD_HTTP_OK:
GNUNET_break (0); // FIXME: not implemented
if (GNUNET_OK !=
withdraw_sign_ok (wsh,
json))
{
GNUNET_break_op (0);
response_code = 0;
}
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the mint is buggy
@ -432,10 +511,11 @@ handle_withdraw_sign_finished (void *cls,
response_code = 0;
break;
}
wsh->cb (wsh->cb_cls,
response_code,
NULL,
json);
if (NULL != wsh->cb)
wsh->cb (wsh->cb_cls,
response_code,
NULL,
json);
json_decref (json);
TALER_MINT_withdraw_sign_cancel (wsh);
}
@ -523,14 +603,18 @@ TALER_MINT_withdraw_sign (struct TALER_MINT_Handle *mint,
size_t coin_ev_size;
json_t *withdraw_obj;
CURL *eh;
struct GNUNET_HashCode c_hash;
wsh = GNUNET_new (struct TALER_MINT_WithdrawSignHandle);
wsh->mint = mint;
wsh->cb = res_cb;
wsh->cb_cls = res_cb_cls;
GNUNET_CRYPTO_eddsa_key_get_public (&coin_priv->eddsa_priv,
&coin_pub.eddsa_pub);
GNUNET_CRYPTO_hash (&coin_pub.eddsa_pub,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
&c_hash);
coin_ev_size = GNUNET_CRYPTO_rsa_blind (&c_hash,
&wsh->c_hash);
coin_ev_size = GNUNET_CRYPTO_rsa_blind (&wsh->c_hash,
blinding_key->rsa_blinding_key,
pk->key.rsa_public_key,
&coin_ev);
@ -547,6 +631,7 @@ TALER_MINT_withdraw_sign (struct TALER_MINT_Handle *mint,
/* mint gave us denomination keys that overflow like this!? */
GNUNET_break_op (0);
GNUNET_free (coin_ev);
GNUNET_free (wsh);
return NULL;
}
TALER_amount_hton (&req.amount_with_fee,
@ -573,10 +658,7 @@ TALER_MINT_withdraw_sign (struct TALER_MINT_Handle *mint,
sizeof (reserve_sig)));
GNUNET_free (coin_ev);
wsh = GNUNET_new (struct TALER_MINT_WithdrawSignHandle);
wsh->mint = mint;
wsh->cb = res_cb;
wsh->cb_cls = res_cb_cls;
wsh->blinding_key = blinding_key;
wsh->url = MAH_path_to_url (mint, "/withdraw/sign");
eh = curl_easy_init ();