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>

2 files changed, 83 insertions, 0 deletions

diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
index 5928546bf00a..6926db724258 100644
--- a/include/linux/oid_registry.h
+++ b/include/linux/oid_registry.h
@@ -86,5 +86,7 @@ enum OID {
 };
 
 extern enum OID look_up_OID(const void *data, size_t datasize);
+extern int sprint_oid(const void *, size_t, char *, size_t);
+extern int sprint_OID(enum OID, char *, size_t);
 
 #endif /* _LINUX_OID_REGISTRY_H */
diff --git a/lib/oid_registry.c b/lib/oid_registry.c
index 33cfd171f627..d8de11f45908 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);