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add function for purse status signing

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This commit is contained in:
Christian Grothoff 2022-05-07 23:27:56 +02:00
parent 4199e4438d
commit 2d84d7f6dd
No known key found for this signature in database
GPG Key ID: 939E6BE1E29FC3CC
3 changed files with 115 additions and 1 deletions
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19
src/include/taler_crypto_lib.h
View File

@ -3976,6 +3976,25 @@ TALER_exchange_online_purse_merged_verify (
const struct TALER_ExchangeSignatureP *sig);
enum TALER_ErrorCode
TALER_exchange_purse_status_sign (
TALER_ExchangeSignCallback scb,
struct GNUNET_TIME_Timestamp merge_timestamp,
struct GNUNET_TIME_Timestamp deposit_timestamp,
const struct TALER_Amount *balance,
struct TALER_ExchangePublicKeyP *pub,
struct TALER_ExchangeSignatureP *sig);
enum GNUNET_GenericReturnValue
TALER_exchange_purse_status_verify (
struct GNUNET_TIME_Timestamp merge_timestamp,
struct GNUNET_TIME_Timestamp deposit_timestamp,
const struct TALER_Amount *balance,
const struct TALER_ExchangePublicKeyP *exchange_pub,
const struct TALER_ExchangeSignatureP *exchange_sig);
/* ********************* offline signing ************************** */

8
src/include/taler_signatures.h
View File

@ -189,6 +189,13 @@
*/
#define TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED 1046
/**
* Purpose for the state of a purse, signed by the exchange's signing
* key.
*/
#define TALER_SIGNATURE_EXCHANGE_PURSE_STATUS 1047
/**********************/
/* Auditor signatures */
/**********************/
@ -383,5 +390,4 @@
#define TALER_SIGNATURE_SYNC_BACKUP_UPLOAD 1450
#endif

89
src/util/exchange_signatures.c
View File

@ -1505,4 +1505,93 @@ TALER_exchange_online_purse_merged_verify (
}
GNUNET_NETWORK_STRUCT_BEGIN
/**
* @brief Format used to generate the signature on a purse status
* from the exchange.
*/
struct TALER_PurseStatusPS
{
/**
* Purpose must be #TALER_SIGNATURE_EXCHANGE_PURSE_STATUS. Signed
* by a `struct TALER_ExchangePublicKeyP` using EdDSA.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Time when the purse was merged, possibly 'never'.
*/
struct GNUNET_TIME_TimestampNBO merge_timestamp;
/**
* Time when the purse was deposited last, possibly 'never'.
*/
struct GNUNET_TIME_TimestampNBO deposit_timestamp;
/**
* Amount deposited in total in the purse without fees.
* May be possibly less than the target amount.
*/
struct TALER_AmountNBO balance;
};
GNUNET_NETWORK_STRUCT_END
enum TALER_ErrorCode
TALER_exchange_purse_status_sign (
TALER_ExchangeSignCallback scb,
struct GNUNET_TIME_Timestamp merge_timestamp,
struct GNUNET_TIME_Timestamp deposit_timestamp,
const struct TALER_Amount *balance,
struct TALER_ExchangePublicKeyP *pub,
struct TALER_ExchangeSignatureP *sig)
{
struct TALER_PurseStatusPS dcs = {
.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_PURSE_STATUS),
.purpose.size = htonl (sizeof (dcs)),
.merge_timestamp = GNUNET_TIME_timestamp_hton (merge_timestamp),
.deposit_timestamp = GNUNET_TIME_timestamp_hton (deposit_timestamp)
};
TALER_amount_hton (&dcs.balance,
balance);
return scb (&dcs.purpose,
pub,
sig);
}
enum GNUNET_GenericReturnValue
TALER_exchange_online_purse_status_verify (
struct GNUNET_TIME_Timestamp merge_timestamp,
struct GNUNET_TIME_Timestamp deposit_timestamp,
const struct TALER_Amount *balance,
const struct TALER_ExchangePublicKeyP *exchange_pub,
const struct TALER_ExchangeSignatureP *exchange_sig)
{
struct TALER_PurseStatusPS dcs = {
.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_PURSE_STATUS),
.purpose.size = htonl (sizeof (dcs)),
.merge_timestamp = GNUNET_TIME_timestamp_hton (merge_timestamp),
.deposit_timestamp = GNUNET_TIME_timestamp_hton (deposit_timestamp)
};
TALER_amount_hton (&dcs.balance,
balance);
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_PURSE_STATUS,
&dcs,
&exchange_sig->eddsa_signature,
&exchange_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/* end of exchange_signatures.c */