From 18aba0abbb427a2e0e76ae88f95fef493e74032d Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 13 Nov 2022 19:03:52 +0100
Subject: add batch logic to taler-exchange-secmod-cs

---
 src/include/taler_crypto_lib.h | 52 ++++++++++++++++++++++++++++++++++++++----
 1 file changed, 48 insertions(+), 4 deletions(-)

(limited to 'src/include')

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 2f12a47ba..8027181fd 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -2484,8 +2484,7 @@ struct TALER_CRYPTO_CsSignRequest
 
 
 /**
- * Request helper @a dh to sign @a msg using the public key corresponding to
- * @a h_denom_pub.
+ * Request helper @a dh to sign @a req.
  *
  * This operation will block until the signature has been obtained.  Should
  * this process receive a signal (that is not ignored) while the operation is
@@ -2506,8 +2505,30 @@ TALER_CRYPTO_helper_cs_sign_melt (
 
 
 /**
- * Request helper @a dh to sign @a msg using the public key corresponding to
- * @a h_denom_pub.
+ * Request helper @a dh to batch sign batch @a reqs.
+ *
+ * This operation will block until the signature has been obtained.  Should
+ * this process receive a signal (that is not ignored) while the operation is
+ * pending, the operation will fail.  Note that the helper may still believe
+ * that it created the signature. Thus, signals may result in a small
+ * differences in the signature counters.  Retrying in this case may work.
+ *
+ * @param dh helper process connection
+ * @param reqs array with information about the keys to sign with and the values to sign
+ * @param reqs_length length of the @a reqs array
+ * @param[out] bss array set to the blind signatures, must be of length @a reqs_length!
+ * @return #TALER_EC_NONE on success
+ */
+enum TALER_ErrorCode
+TALER_CRYPTO_helper_cs_batch_sign_melt (
+  struct TALER_CRYPTO_CsDenominationHelper *dh,
+  const struct TALER_CRYPTO_CsSignRequest *reqs,
+  unsigned int reqs_length,
+  struct TALER_BlindedDenominationSignature *bss);
+
+
+/**
+ * Request helper @a dh to sign @a req.
  *
  * This operation will block until the signature has been obtained.  Should
  * this process receive a signal (that is not ignored) while the operation is
@@ -2527,6 +2548,29 @@ TALER_CRYPTO_helper_cs_sign_withdraw (
   struct TALER_BlindedDenominationSignature *bs);
 
 
+/**
+ * Request helper @a dh to sign batch of @a reqs requests.
+ *
+ * This operation will block until the signature has been obtained.  Should
+ * this process receive a signal (that is not ignored) while the operation is
+ * pending, the operation will fail.  Note that the helper may still believe
+ * that it created the signature. Thus, signals may result in a small
+ * differences in the signature counters.  Retrying in this case may work.
+ *
+ * @param dh helper process connection
+ * @param reqs information about the keys to sign with and the values to sign
+ * @param reqs_length length of the @a reqs array
+ * @param[out] bs array set to the blind signatures, must be of length @a reqs_length!
+ * @return #TALER_EC_NONE on success
+ */
+enum TALER_ErrorCode
+TALER_CRYPTO_helper_cs_batch_sign_withdraw (
+  struct TALER_CRYPTO_CsDenominationHelper *dh,
+  const struct TALER_CRYPTO_CsSignRequest *reqs,
+  unsigned int reqs_length,
+  struct TALER_BlindedDenominationSignature *bss);
+
+
 /**
  * Ask the helper to revoke the public key associated with @a h_cs.
  * Will cause the helper to tell all clients that the key is now unavailable,
-- 
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