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authorDavid Howells <dhowells@redhat.com>2012-09-21 23:30:51 +0100
committerRusty Russell <rusty@rustcorp.com.au>2012-10-08 13:50:18 +1030
commit4f73175d0375a7c1b3ae625e76acee8b39741f28 (patch)
tree78c47940a9530bf4342f258c322f8e21412f5830 /lib
parenta77ad6ea0b0bb1f9d1f52ed494bd72a5fdde208e (diff)
downloadvexpress-lsk-4f73175d0375a7c1b3ae625e76acee8b39741f28.tar.gz
X.509: Add utility functions to render OIDs as strings
Add a pair of utility functions to render OIDs as strings. The first takes an encoded OID and turns it into a "a.b.c.d" form string: int sprint_oid(const void *data, size_t datasize, char *buffer, size_t bufsize); The second takes an OID enum index and calls the first on the data held therein: int sprint_OID(enum OID oid, char *buffer, size_t bufsize); Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'lib')
-rw-r--r--lib/oid_registry.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/oid_registry.c b/lib/oid_registry.c
index 33cfd171f62..d8de11f4590 100644
--- a/lib/oid_registry.c
+++ b/lib/oid_registry.c
@@ -11,6 +11,9 @@
#include <linux/export.h>
#include <linux/oid_registry.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/bug.h>
#include "oid_registry_data.c"
/**
@@ -87,3 +90,81 @@ enum OID look_up_OID(const void *data, size_t datasize)
return OID__NR;
}
EXPORT_SYMBOL_GPL(look_up_OID);
+
+/*
+ * sprint_OID - Print an Object Identifier into a buffer
+ * @data: The encoded OID to print
+ * @datasize: The size of the encoded OID
+ * @buffer: The buffer to render into
+ * @bufsize: The size of the buffer
+ *
+ * The OID is rendered into the buffer in "a.b.c.d" format and the number of
+ * bytes is returned. -EBADMSG is returned if the data could not be intepreted
+ * and -ENOBUFS if the buffer was too small.
+ */
+int sprint_oid(const void *data, size_t datasize, char *buffer, size_t bufsize)
+{
+ const unsigned char *v = data, *end = v + datasize;
+ unsigned long num;
+ unsigned char n;
+ size_t ret;
+ int count;
+
+ if (v >= end)
+ return -EBADMSG;
+
+ n = *v++;
+ ret = count = snprintf(buffer, bufsize, "%u.%u", n / 40, n % 40);
+ buffer += count;
+ bufsize -= count;
+ if (bufsize == 0)
+ return -ENOBUFS;
+
+ while (v < end) {
+ num = 0;
+ n = *v++;
+ if (!(n & 0x80)) {
+ num = n;
+ } else {
+ num = n & 0x7f;
+ do {
+ if (v >= end)
+ return -EBADMSG;
+ n = *v++;
+ num <<= 7;
+ num |= n & 0x7f;
+ } while (n & 0x80);
+ }
+ ret += count = snprintf(buffer, bufsize, ".%lu", num);
+ buffer += count;
+ bufsize -= count;
+ if (bufsize == 0)
+ return -ENOBUFS;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sprint_oid);
+
+/**
+ * sprint_OID - Print an Object Identifier into a buffer
+ * @oid: The OID to print
+ * @buffer: The buffer to render into
+ * @bufsize: The size of the buffer
+ *
+ * The OID is rendered into the buffer in "a.b.c.d" format and the number of
+ * bytes is returned.
+ */
+int sprint_OID(enum OID oid, char *buffer, size_t bufsize)
+{
+ int ret;
+
+ BUG_ON(oid >= OID__NR);
+
+ ret = sprint_oid(oid_data + oid_index[oid],
+ oid_index[oid + 1] - oid_index[oid],
+ buffer, bufsize);
+ BUG_ON(ret == -EBADMSG);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sprint_OID);