From 3526c44a38195aaea2ab48a220728df175ab9429 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Fri, 6 May 2016 18:33:02 +0200
Subject: refactor code to write signing keys in same module where we read them

---
 src/exchangedb/exchangedb_keyio.c      | 57 ++++++++++++++++++++++++++++++++
 src/exchangedb/test_exchangedb_keyio.c | 59 +++++++++++++++++++++++++++++++---
 2 files changed, 112 insertions(+), 4 deletions(-)

(limited to 'src/exchangedb')

diff --git a/src/exchangedb/exchangedb_keyio.c b/src/exchangedb/exchangedb_keyio.c
index 5f29cb0d8..773fc9284 100644
--- a/src/exchangedb/exchangedb_keyio.c
+++ b/src/exchangedb/exchangedb_keyio.c
@@ -113,6 +113,63 @@ TALER_EXCHANGEDB_signing_keys_iterate (const char *exchange_base_dir,
 }
 
 
+/**
+ * Obtain the name of the directory we use to store signing
+ * keys created at time @a start.
+ *
+ * @param start time at which we create the signing key
+ * @return name of the directory we should use, basically "$EXCHANGEDIR/$TIME/";
+ *         (valid until next call to this function)
+ */
+static char *
+get_signkey_file (const char *exchange_directory,
+                  struct GNUNET_TIME_Absolute start)
+{
+  char *dir;
+
+  GNUNET_asprintf (&dir,
+                   "%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS DIR_SEPARATOR_STR "%llu",
+                   exchange_directory,
+                   (unsigned long long) start.abs_value_us);
+  return dir;
+}
+
+
+/**
+ * Exports a signing key to the given file.
+ *
+ * @param exchange_base_dir base directory for the keys
+ * @param start start time of the validity for the key
+ * @param ski the signing key
+ * @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
+ */
+int
+TALER_EXCHANGEDB_signing_key_write (const char *exchange_base_dir,
+                                    struct GNUNET_TIME_Absolute start,
+                                    const struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP *ski)
+{
+  char *skf;
+  ssize_t nwrite;
+
+  skf = get_signkey_file (exchange_base_dir,
+                          start);
+  nwrite = GNUNET_DISK_fn_write (skf,
+                                 ski,
+                                 sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP),
+                                 GNUNET_DISK_PERM_USER_WRITE | GNUNET_DISK_PERM_USER_READ);
+  if (sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP) != nwrite)
+  {
+    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+                              "write",
+                              skf);
+    GNUNET_free (skf);
+    return GNUNET_SYSERR;
+  }
+  GNUNET_free (skf);
+  return GNUNET_OK;
+}
+
+
 /**
  * Import a denomination key from the given file.
  *
diff --git a/src/exchangedb/test_exchangedb_keyio.c b/src/exchangedb/test_exchangedb_keyio.c
index 2485da8ae..ab68f9cc2 100644
--- a/src/exchangedb/test_exchangedb_keyio.c
+++ b/src/exchangedb/test_exchangedb_keyio.c
@@ -14,8 +14,8 @@
   TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
 */
 /**
- * @file exchange/test_exchange_common.c
- * @brief test cases for some functions in exchange/exchange_common.c
+ * @file exchangedb/test_exchangedb_keyio.c
+ * @brief test cases for some functions in exchangedb/exchangedb_keyio.c
  * @author Sree Harsha Totakura <sreeharsha@totakura.in>
  */
 #include "platform.h"
@@ -31,6 +31,47 @@
     if (cond) { GNUNET_break (0); goto EXITIF_exit; }             \
   } while (0)
 
+/**
+ * @brief Iterator called on denomination key.
+ *
+ * @param cls closure with expected DKI
+ * @param dki the denomination key
+ * @param alias coin alias
+ * @return #GNUNET_OK to continue to iterate,
+ *  #GNUNET_NO to stop iteration with no error,
+ *  #GNUNET_SYSERR to abort iteration with error!
+ */
+static int
+dki_iter (void *cls,
+          const char *alias,
+          const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
+{
+  const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *exp = cls;
+
+  if (0 != memcmp (&exp->issue,
+                   &dki->issue,
+                   sizeof (struct TALER_EXCHANGEDB_DenominationKeyInformationP)))
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  if (0 !=
+      GNUNET_CRYPTO_rsa_private_key_cmp (exp->denom_priv.rsa_private_key,
+                                         dki->denom_priv.rsa_private_key))
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  if (0 !=
+      GNUNET_CRYPTO_rsa_public_key_cmp (exp->denom_pub.rsa_public_key,
+                                        dki->denom_pub.rsa_public_key))
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
 
 int
 main (int argc,
@@ -59,8 +100,18 @@ main (int argc,
   enc_size = GNUNET_CRYPTO_rsa_private_key_encode (dki.denom_priv.rsa_private_key,
                                                    &enc);
   EXITIF (NULL == (tmpfile = GNUNET_DISK_mktemp ("test_exchange_common")));
-  EXITIF (GNUNET_OK != TALER_EXCHANGEDB_denomination_key_write (tmpfile, &dki));
-  EXITIF (GNUNET_OK != TALER_EXCHANGEDB_denomination_key_read (tmpfile, &dki_read));
+  EXITIF (GNUNET_OK !=
+          TALER_EXCHANGEDB_denomination_key_write (tmpfile,
+                                                   &dki));
+  EXITIF (GNUNET_OK !=
+          TALER_EXCHANGEDB_denomination_key_read (tmpfile,
+                                                  &dki_read));
+  EXITIF (1 !=
+          TALER_EXCHANGEDB_denomination_keys_iterate (tmpfile,
+                                                      &dki_iter,
+                                                      &dki));
+
+
   enc_read_size = GNUNET_CRYPTO_rsa_private_key_encode (dki_read.denom_priv.rsa_private_key,
                                                         &enc_read);
   EXITIF (enc_size != enc_read_size);
-- 
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