1 files changed, 75 insertions, 0 deletions
diff --git a/uuid.c b/uuid.c
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index 0000000..04410c0
--- /dev/null
+++ b/uuid.c
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+/*
+ * 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:
+ */