Revised keystore API, part one. Not usable yet.

Changes to implement a revised keystore API.  This code probably won't
even compile properly yet, and almost certainly will not run, but most
of the expected changes are complete at this point.  Main points:

* Key names are now UUIDs, and are generated by the HSM, not the client.

* Keystore API no longer assumes that key database is resident in
  memory (original API was written on the assumption that the keystore
  flash would be mapped into the HSM CPU's address space, but
  apparently the board and flash drivers don't really support that).

A few other changes have probably crept in, but the bulk of this
changeset is just following through implications of the above, some of
which percolate all the way back to the public RPC API.

1 files changed, 75 insertions, 0 deletions

diff --git a/uuid.c b/uuid.c
new file mode 100644
index 0000000..04410c0
--- /dev/null
+++ b/uuid.c
@@ -0,0 +1,75 @@
+/*
+ * uuid.c
+ * ------
+ * UUID support for keystore database.
+ *
+ * Copyright (c) 2016, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+
+#include "hal.h"
+#include "hal_internal.h"
+
+hal_error_t hal_uuid_gen(hal_uuid_t *uuid)
+{
+  hal_error_t err;
+
+  if (uuid == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+
+  /*
+   * Generate a version 4 UUID as specified in RFC 4122.
+   * This is basically a 122-bit random number.
+   */
+
+  if ((err = hal_rpc_get_random(uuid->uuid, sizeof(uuid->uuid))) != HAL_OK)
+    return err;
+
+  /*
+   * Set high order bits of clock_seq_hi_and_reserved and
+   * time_hi_and_version fields to magic values as specified by RFC
+   * 4122 section 4.4.
+   *
+   * Not recommended reading if you've eaten recently.
+   */
+
+  uuid->uuid[6] &= 0x0f;
+  uuid->uuid[6] |= 0x40;
+  uuid->uuid[8] &= 0x3f;
+  uuid->uuid[8] |= 0x80;
+
+  return HAL_OK;
+}
+
+/*
+ * Local variables:
+ * indent-tabs-mode: nil
+ * End:
+ */