1 files changed, 126 insertions, 0 deletions
diff --git a/src/util/secmod_signatures.c b/src/util/secmod_signatures.c
new file mode 100644
index 000000000..5a2e338ce
--- /dev/null
+++ b/src/util/secmod_signatures.c
@@ -0,0 +1,126 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file secmod_signatures.c
+ * @brief Utility functions for Taler security module signatures
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_util.h"
+#include "taler_signatures.h"
+
+
+void
+TALER_exchange_secmod_eddsa_sign (
+  const struct TALER_ExchangePublicKeyP *exchange_pub,
+  struct GNUNET_TIME_Absolute start_sign,
+  struct GNUNET_TIME_Relative duration,
+  const struct TALER_SecurityModulePrivateKeyP *secm_priv,
+  struct TALER_SecurityModuleSignatureP *secm_sig)
+{
+  struct TALER_SigningKeyAnnouncementPS ska = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_SM_SIGNING_KEY),
+    .purpose.size = htonl (sizeof (ska)),
+    .exchange_pub = *exchange_pub,
+    .anchor_time = GNUNET_TIME_absolute_hton (start_sign),
+    .duration = GNUNET_TIME_relative_hton (duration)
+  };
+
+  GNUNET_CRYPTO_eddsa_sign (&secm_priv->eddsa_priv,
+                            &ska,
+                            &secm_sig->eddsa_signature);
+}
+
+
+int
+TALER_exchange_secmod_eddsa_verify (
+  const struct TALER_ExchangePublicKeyP *exchange_pub,
+  struct GNUNET_TIME_Absolute start_sign,
+  struct GNUNET_TIME_Relative duration,
+  const struct TALER_SecurityModulePublicKeyP *secm_pub,
+  const struct TALER_SecurityModuleSignatureP *secm_sig)
+{
+  struct TALER_SigningKeyAnnouncementPS ska = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_SM_SIGNING_KEY),
+    .purpose.size = htonl (sizeof (ska)),
+    .exchange_pub = *exchange_pub,
+    .anchor_time = GNUNET_TIME_absolute_hton (start_sign),
+    .duration = GNUNET_TIME_relative_hton (duration)
+  };
+
+  return
+    GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_SM_SIGNING_KEY,
+                                &ska,
+                                &secm_sig->eddsa_signature,
+                                &secm_pub->eddsa_pub);
+}
+
+
+void
+TALER_exchange_secmod_rsa_sign (
+  const struct GNUNET_HashCode *h_denom_pub,
+  const char *section_name,
+  struct GNUNET_TIME_Absolute start_sign,
+  struct GNUNET_TIME_Relative duration,
+  const struct TALER_SecurityModulePrivateKeyP *secm_priv,
+  struct TALER_SecurityModuleSignatureP *secm_sig)
+{
+  struct TALER_DenominationKeyAnnouncementPS dka = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_SM_DENOMINATION_KEY),
+    .purpose.size = htonl (sizeof (dka)),
+    .h_denom_pub = *h_denom_pub,
+    .anchor_time = GNUNET_TIME_absolute_hton (start_sign),
+    .duration_withdraw = GNUNET_TIME_relative_hton (duration)
+  };
+
+  GNUNET_CRYPTO_hash (section_name,
+                      strlen (section_name) + 1,
+                      &dka.h_section_name);
+  GNUNET_CRYPTO_eddsa_sign (&secm_priv->eddsa_priv,
+                            &dka,
+                            &secm_sig->eddsa_signature);
+
+}
+
+
+int
+TALER_exchange_secmod_rsa_verify (
+  const struct GNUNET_HashCode *h_denom_pub,
+  const char *section_name,
+  struct GNUNET_TIME_Absolute start_sign,
+  struct GNUNET_TIME_Relative duration,
+  const struct TALER_SecurityModulePublicKeyP *secm_pub,
+  const struct TALER_SecurityModuleSignatureP *secm_sig)
+{
+  struct TALER_DenominationKeyAnnouncementPS dka = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_SM_DENOMINATION_KEY),
+    .purpose.size = htonl (sizeof (dka)),
+    .anchor_time = GNUNET_TIME_absolute_hton (start_sign),
+    .duration_withdraw = GNUNET_TIME_relative_hton (duration)
+  };
+
+  GNUNET_CRYPTO_hash (section_name,
+                      strlen (section_name) + 1,
+                      &dka.h_section_name);
+  return
+    GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_SM_DENOMINATION_KEY,
+                                &dka,
+                                &secm_sig->eddsa_signature,
+                                &secm_pub->eddsa_pub);
+}
+
+
+/* end of secmod_signatures.c */