From 8d0bf81801acfca1b2007b8300bf80deafed5a00 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <grothoff@gnunet.org>
Date: Tue, 27 Dec 2022 11:49:41 +0100
Subject: -new crypto functions

---
 src/util/offline_signatures.c | 91 +++++++++++++++++++++++++++++++++++++++++++
 src/util/wallet_signatures.c  | 53 +++++++++++++++++++++++++
 2 files changed, 144 insertions(+)

(limited to 'src/util')

diff --git a/src/util/offline_signatures.c b/src/util/offline_signatures.c
index d0b644e7f..d6638998b 100644
--- a/src/util/offline_signatures.c
+++ b/src/util/offline_signatures.c
@@ -23,6 +23,97 @@
 #include "taler_signatures.h"
 
 
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * @brief Signature made by the exchange offline key over the information of
+ * an AML officer status change.
+ */
+struct TALER_MasterAmlOfficerStatusPS
+{
+
+  /**
+   * Purpose is #TALER_SIGNATURE_MASTER_AML_KEY.   Signed
+   * by a `struct TALER_MasterPublicKeyP` using EdDSA.
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+  /**
+   * Time of the change.
+   */
+  struct GNUNET_TIME_TimestampNBO change_date;
+
+  /**
+   * Public key of the AML officer.
+   */
+  struct TALER_AmlOfficerPublicKeyP officer_pub;
+
+  /**
+   * Hash over the AML officer's name.
+   */
+  struct GNUNET_HashCode h_officer_name GNUNET_PACKED;
+
+  /**
+   * 1 if enabled, 0 if disabled, in NBO.
+   */
+  uint32_t is_active GNUNET_PACKED;
+};
+GNUNET_NETWORK_STRUCT_END
+
+
+void
+TALER_exchange_offline_aml_officer_status_sign (
+  const struct TALER_AmlOfficerPublicKeyP *officer_pub,
+  const char *officer_name,
+  struct GNUNET_TIME_Timestamp change_date,
+  bool is_active,
+  const struct TALER_MasterPrivateKeyP *master_priv,
+  struct TALER_MasterSignatureP *master_sig)
+{
+  struct TALER_MasterAmlOfficerStatusPS as = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_MASTER_AML_KEY),
+    .purpose.size = htonl (sizeof (as)),
+    .change_date = GNUNET_TIME_timestamp_hton (change_date),
+    .officer_pub = *officer_pub,
+    .is_active = htonl (is_active ? 1 : 0)
+  };
+
+  GNUNET_CRYPTO_hash (officer_name,
+                      strlen (officer_name) + 1,
+                      &as.h_officer_name);
+  GNUNET_CRYPTO_eddsa_sign (&master_priv->eddsa_priv,
+                            &as,
+                            &master_sig->eddsa_signature);
+}
+
+
+enum GNUNET_GenericReturnValue
+TALER_exchange_offline_aml_officer_status_verify (
+  const struct TALER_AmlOfficerPublicKeyP *officer_pub,
+  const char *officer_name,
+  struct GNUNET_TIME_Timestamp change_date,
+  bool is_active,
+  const struct TALER_MasterPublicKeyP *master_pub,
+  const struct TALER_MasterSignatureP *master_sig)
+{
+  struct TALER_MasterAmlOfficerStatusPS as = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_MASTER_AML_KEY),
+    .purpose.size = htonl (sizeof (as)),
+    .change_date = GNUNET_TIME_timestamp_hton (change_date),
+    .officer_pub = *officer_pub,
+    .is_active = htonl (is_active ? 1 : 0)
+  };
+
+  GNUNET_CRYPTO_hash (officer_name,
+                      strlen (officer_name) + 1,
+                      &as.h_officer_name);
+  return GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_AML_KEY,
+                                     &as,
+                                     &master_sig->eddsa_signature,
+                                     &master_pub->eddsa_pub);
+}
+
+
 GNUNET_NETWORK_STRUCT_BEGIN
 
 /**
diff --git a/src/util/wallet_signatures.c b/src/util/wallet_signatures.c
index 6866ca19b..b74a9fead 100644
--- a/src/util/wallet_signatures.c
+++ b/src/util/wallet_signatures.c
@@ -907,6 +907,59 @@ TALER_wallet_purse_create_verify (
 }
 
 
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Message signed to delete a purse.
+ */
+struct TALER_PurseDeletePS
+{
+
+  /**
+   * Purpose is #TALER_SIGNATURE_WALLET_PURSE_DELETE
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+};
+
+
+GNUNET_NETWORK_STRUCT_END
+
+
+void
+TALER_wallet_purse_delete_sign (
+  const struct TALER_PurseContractPrivateKeyP *purse_priv,
+  struct TALER_PurseContractSignatureP *purse_sig)
+{
+  struct TALER_PurseDeletePS pm = {
+    .purpose.size = htonl (sizeof (pm)),
+    .purpose.purpose = htonl (TALER_SIGNATURE_WALLET_PURSE_DELETE)
+  };
+
+  GNUNET_CRYPTO_eddsa_sign (&purse_priv->eddsa_priv,
+                            &pm,
+                            &purse_sig->eddsa_signature);
+}
+
+
+enum GNUNET_GenericReturnValue
+TALER_wallet_purse_delete_verify (
+  const struct TALER_PurseContractPublicKeyP *purse_pub,
+  const struct TALER_PurseContractSignatureP *purse_sig)
+{
+  struct TALER_PurseDeletePS pm = {
+    .purpose.size = htonl (sizeof (pm)),
+    .purpose.purpose = htonl (TALER_SIGNATURE_WALLET_PURSE_DELETE)
+  };
+
+  return GNUNET_CRYPTO_eddsa_verify (
+    TALER_SIGNATURE_WALLET_PURSE_DELETE,
+    &pm,
+    &purse_sig->eddsa_signature,
+    &purse_pub->eddsa_pub);
+}
+
+
 void
 TALER_wallet_purse_status_sign (
   const struct TALER_PurseContractPrivateKeyP *purse_priv,
-- 
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