1 files changed, 77 insertions, 0 deletions
diff --git a/common/digest.c b/common/digest.c
new file mode 100644
index 0000000000..10ad06005e
--- /dev/null
+++ b/common/digest.c
@@ -0,0 +1,77 @@
+/*
+ * (C) Copyright 2008-2010 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program 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; version 2 of
+ * the License.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <digest.h>
+#include <malloc.h>
+#include <errno.h>
+#include <module.h>
+#include <linux/err.h>
+
+static LIST_HEAD(digests);
+
+static int dummy_init(struct digest *d)
+{
+	return 0;
+}
+
+int digest_register(struct digest *d)
+{
+	if (!d || !d->name || !d->update || !d->final || d->length < 1)
+		return -EINVAL;
+
+	if (!d->init)
+		d->init = dummy_init;
+
+	if (digest_get_by_name(d->name))
+		return -EEXIST;
+
+	list_add_tail(&d->list, &digests);
+
+	return 0;
+}
+EXPORT_SYMBOL(digest_register);
+
+void digest_unregister(struct digest *d)
+{
+	if (!d)
+		return;
+
+	list_del(&d->list);
+}
+EXPORT_SYMBOL(digest_unregister);
+
+struct digest* digest_get_by_name(char* name)
+{
+	struct digest* d;
+
+	if (!name)
+		return NULL;
+
+	list_for_each_entry(d, &digests, list) {
+		if(strcmp(d->name, name) == 0)
+			return d;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(digest_get_by_name);