1 files changed, 47 insertions, 0 deletions
diff --git a/libntp/authusekey.c b/libntp/authusekey.c
new file mode 100644
index 000000000000..40dd3737ddf2
--- /dev/null
+++ b/libntp/authusekey.c
@@ -0,0 +1,47 @@
+/*
+ * authusekey - decode a key from ascii and use it
+ */
+#include <stdio.h>
+#include <ctype.h>
+
+#include "ntp_types.h"
+#include "ntp_string.h"
+#include "ntp_stdlib.h"
+
+/*
+ * Types of ascii representations for keys.  "Standard" means a 64 bit
+ * hex number in NBS format, i.e. with the low order bit of each byte
+ * a parity bit.  "NTP" means a 64 bit key in NTP format, with the
+ * high order bit of each byte a parity bit.  "Ascii" means a 1-to-8
+ * character string whose ascii representation is used as the key.
+ */
+
+#define	KEY_TYPE_MD5	4
+
+int
+authusekey(
+	keyid_t keyno,
+	int keytype,
+	const u_char *str
+	)
+{
+	const u_char *cp;
+	int len;
+
+	cp = str;
+	len = strlen((const char *)cp);
+	if (len == 0)
+	    return 0;
+
+	switch(keytype) {
+	    case KEY_TYPE_MD5:
+		MD5auth_setkey(keyno, str, (int)strlen((const char *)str));
+		break;
+
+	    default:
+		/* Oh, well */
+		return 0;
+	}
+
+	return 1;
+}