[taler-exchange] branch master updated: -new crypto functions

[gnunet]

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grothoff pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new 8d0bf818 -new crypto functions
8d0bf818 is described below

commit 8d0bf81801acfca1b2007b8300bf80deafed5a00
Author: Christian Grothoff <grothoff@gnunet.org>
AuthorDate: Tue Dec 27 11:49:41 2022 +0100

    -new crypto functions
---
 contrib/gana                      |   2 +-
 src/exchangedb/0003-aml_staff.sql |   2 +-
 src/include/taler_crypto_lib.h    | 103 ++++++++++++++++++++++++++++++++++++++
 src/util/offline_signatures.c     |  91 +++++++++++++++++++++++++++++++++
 src/util/wallet_signatures.c      |  53 ++++++++++++++++++++
 5 files changed, 249 insertions(+), 2 deletions(-)

diff --git a/contrib/gana b/contrib/gana
index 20f8eb7a..3a0709c6 160000
--- a/contrib/gana
+++ b/contrib/gana
@@ -1 +1 @@
-Subproject commit 20f8eb7a72e2160409f0f78264ec5198e9caa193
+Subproject commit 3a0709c68490ba3c5612cdb1da36ee298097ebce
diff --git a/src/exchangedb/0003-aml_staff.sql 
b/src/exchangedb/0003-aml_staff.sql
index 3c538df1..9015c780 100644
--- a/src/exchangedb/0003-aml_staff.sql
+++ b/src/exchangedb/0003-aml_staff.sql
@@ -28,7 +28,7 @@ COMMENT ON TABLE aml_staff
 COMMENT ON COLUMN aml_staff.decider_pub
   IS 'Public key of the AML staff member.';
 COMMENT ON COLUMN aml_staff.master_sig
-  IS 'The master public key signature on the AML staff member status.';
+  IS 'The master public key signature on the AML staff member status, of type 
TALER_SIGNATURE_MASTER_AML_KEY.';
 COMMENT ON COLUMN aml_staff.decider_name
   IS 'Name of the staff member.';
 COMMENT ON COLUMN aml_staff.is_active
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 97e82b4c..d63fd7cc 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -499,6 +499,43 @@ struct TALER_PurseMergeSignatureP
 };
 
 
+/**
+ * @brief Type of online public keys used by AML officers.
+ */
+struct TALER_AmlOfficerPublicKeyP
+{
+  /**
+   * Taler uses EdDSA for AML decision signing.
+   */
+  struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
+};
+
+
+/**
+ * @brief Type of online private keys used to identify
+ * AML officers.
+ */
+struct TALER_AmlOfficerPrivateKeyP
+{
+  /**
+   * Taler uses EdDSA for AML decision signing.
+   */
+  struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
+};
+
+
+/**
+ * @brief Type of signatures used by AML officers.
+ */
+struct TALER_AmlOfficerSignatureP
+{
+  /**
+   * Taler uses EdDSA for AML decision signing.
+   */
+  struct GNUNET_CRYPTO_EddsaSignature eddsa_signature;
+};
+
+
 /**
  * @brief Type of blinding keys for Taler.
  * must be 32 bytes (DB)
@@ -2819,6 +2856,31 @@ TALER_wallet_purse_create_verify (
   const struct TALER_PurseContractSignatureP *purse_sig);
 
 
+/**
+ * Sign a request to delete a purse.
+ *
+ * @param purse_priv key identifying the purse
+ * @param[out] purse_sig resulting signature
+ */
+void
+TALER_wallet_purse_delete_sign (
+  const struct TALER_PurseContractPrivateKeyP *purse_priv,
+  struct TALER_PurseContractSignatureP *purse_sig);
+
+
+/**
+ * Verify a purse deletion request.
+ *
+ * @param purse_pub purse’s public key
+ * @param purse_sig the signature made with purpose 
#TALER_SIGNATURE_WALLET_PURSE_DELETE
+ * @return #GNUNET_OK if the signature is valid
+ */
+enum GNUNET_GenericReturnValue
+TALER_wallet_purse_delete_verify (
+  const struct TALER_PurseContractPublicKeyP *purse_pub,
+  const struct TALER_PurseContractSignatureP *purse_sig);
+
+
 /**
  * Sign a request to upload an encrypted contract.
  *
@@ -4528,6 +4590,47 @@ TALER_exchange_online_purse_status_verify (
 /* ********************* offline signing ************************** */
 
 
+/**
+ * Create AML officer status change signature.
+ *
+ * @param officer_pub public key of the AML officer
+ * @param officer_name name of the officer
+ * @param change_date when to affect the status change
+ * @param is_active true to enable the officer
+ * @param master_priv private key to sign with
+ * @param[out] master_sig where to write the signature
+ */
+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);
+
+
+/**
+ * Verify AML officer status change signature.
+ *
+ * @param officer_pub public key of the AML officer
+ * @param officer_name name of the officer
+ * @param change_date when to affect the status change
+ * @param is_active true to enable the officer
+ * @param master_pub public key to verify against
+ * @param master_sig the signature the signature
+ * @return #GNUNET_OK if the signature is valid
+ */
+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);
+
+
 /**
  * Create auditor addition signature.
  *
diff --git a/src/util/offline_signatures.c b/src/util/offline_signatures.c
index d0b644e7..d6638998 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 6866ca19..b74a9fea 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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