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authorChristian Grothoff <christian@grothoff.org>2022-05-07 23:27:56 +0200
committerChristian Grothoff <christian@grothoff.org>2022-05-07 23:27:56 +0200
commit2d84d7f6ddce69b5c1d4d44a16a9aa0663fd4eba (patch)
treeee179098d910dc959522cbf78f146f2983a3ee49 /src/util
parent4199e4438d2dac9b18e1e922dec72723bc6d7c04 (diff)
downloadexchange-2d84d7f6ddce69b5c1d4d44a16a9aa0663fd4eba.tar.gz
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add function for purse status signing
Diffstat (limited to 'src/util')
-rw-r--r--src/util/exchange_signatures.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/util/exchange_signatures.c b/src/util/exchange_signatures.c
index d6214ab3e..41f2b61a1 100644
--- a/src/util/exchange_signatures.c
+++ b/src/util/exchange_signatures.c
@@ -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 */