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implement CS refresh-reveal signing, simplify TEH keys logic

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This commit is contained in:
Christian Grothoff 2022-02-09 19:24:29 +01:00
parent 8e4eaabc96
commit 008ba5cf89
No known key found for this signature in database
GPG Key ID: 939E6BE1E29FC3CC
4 changed files with 14 additions and 80 deletions
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12
src/exchange/taler-exchange-httpd_keys.c
View File

@ -2415,7 +2415,7 @@ TEH_keys_denomination_by_hash2 (
struct TALER_BlindedDenominationSignature
TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
const struct TEH_SignDetails *msg,
const struct TALER_BlindedPlanchet *bp,
enum TALER_ErrorCode *ec)
{
struct TEH_KeyStateHandle *ksh;
@ -2438,7 +2438,7 @@ TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
*ec = TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN;
return none;
}
if (msg->cipher != hd->denom_pub.cipher)
if (bp->cipher != hd->denom_pub.cipher)
{
*ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
return none;
@ -2448,13 +2448,15 @@ TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
case TALER_DENOMINATION_RSA:
return TALER_CRYPTO_helper_rsa_sign (ksh->helpers->rsadh,
&hd->h_details.h_rsa,
msg->details.rsa_message.msg,
msg->details.rsa_message.msg_size,
bp->details.rsa_blinded_planchet.
blinded_msg,
bp->details.rsa_blinded_planchet.
blinded_msg_size,
ec);
case TALER_DENOMINATION_CS:
return TALER_CRYPTO_helper_cs_sign (ksh->helpers->csdh,
&hd->h_details.h_cs,
&msg->details.cs_message,
&bp->details.cs_blinded_planchet,
ec);
default:
*ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;

41
src/exchange/taler-exchange-httpd_keys.h
View File

@ -82,42 +82,6 @@ struct TEH_DenominationKey
};
struct TEH_SignDetails_RSA
{
/**
* message to sign
*/
const void *msg;
/**
* number of bytes in msg
*/
size_t msg_size;
};
struct TEH_SignDetails
{
/**
* Cipher type of the message
*/
enum TALER_DenominationCipher cipher;
union
{
/**
* If we use #TALER_DENOMINATION_RSA in @a cipher.
*/
struct TEH_SignDetails_RSA rsa_message;
/**
* If we use #TALER_DENOMINATION_CS in @a cipher.
*/
struct TALER_BlindedCsPlanchet cs_message;
} details;
};
/**
* Snapshot of the (coin and signing) keys (including private keys) of
* the exchange. There can be multiple instances of this struct, as it is
@ -207,15 +171,14 @@ TEH_keys_denomination_by_hash2 (struct TEH_KeyStateHandle *ksh,
* @a h_denom_pub.
*
* @param h_denom_pub hash of the public key to use to sign
* @param msg message to sign
* @param msg_size number of bytes in @a msg
* @param bp blinded planchet to sign
* @param[out] ec set to the error code (or #TALER_EC_NONE on success)
* @return signature, the value inside the structure will be NULL on failure,
* see @a ec for details about the failure
*/
struct TALER_BlindedDenominationSignature
TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
const struct TEH_SignDetails *msg,
const struct TALER_BlindedPlanchet *bp,
enum TALER_ErrorCode *ec);

9
src/exchange/taler-exchange-httpd_refreshes_reveal.c
View File

@ -603,18 +603,11 @@ resolve_refreshes_reveal_denominations (struct MHD_Connection *connection,
for (unsigned int i = 0; i<rctx->num_fresh_coins; i++)
{
enum TALER_ErrorCode ec = TALER_EC_NONE;
struct TEH_SignDetails sign_details;
const struct TALER_BlindedRsaPlanchet *rp;
// FIXME: implement cipher handling
rp = &rcds[i].blinded_planchet.details.rsa_blinded_planchet;
sign_details.cipher = TALER_DENOMINATION_RSA;
sign_details.details.rsa_message.msg = rp->blinded_msg;
sign_details.details.rsa_message.msg_size = rp->blinded_msg_size;
rrcs[i].coin_sig
= TEH_keys_denomination_sign (
&rrcs[i].h_denom_pub,
&sign_details,
&rcds[i].blinded_planchet,
&ec);
if (TALER_EC_NONE != ec)
{

26
src/exchange/taler-exchange-httpd_withdraw.c
View File

@ -502,34 +502,10 @@ TEH_handler_withdraw (struct TEH_RequestContext *rc,
/* Sign before transaction! */
ec = TALER_EC_NONE;
{
struct TEH_SignDetails sign_details;
sign_details.cipher = wc.blinded_planchet.cipher;
switch (wc.blinded_planchet.cipher)
{
case TALER_DENOMINATION_RSA:
sign_details.details.rsa_message.msg =
wc.blinded_planchet.details.rsa_blinded_planchet.blinded_msg;
sign_details.details.rsa_message.msg_size =
wc.blinded_planchet.details.rsa_blinded_planchet.blinded_msg_size;
break;
case TALER_DENOMINATION_CS:
sign_details.details.cs_message =
wc.blinded_planchet.details.cs_blinded_planchet;
break;
default:
GNUNET_break (0);
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE,
NULL);
}
wc.collectable.sig = TEH_keys_denomination_sign (
&wc.collectable.denom_pub_hash,
&sign_details,
&wc.blinded_planchet,
&ec);
}
if (TALER_EC_NONE != ec)
{
GNUNET_break (0);