1 files changed, 132 insertions, 0 deletions
diff --git a/usr.sbin/xntpd/lib/authusekey.c b/usr.sbin/xntpd/lib/authusekey.c
new file mode 100644
index 0000000..0452031
--- /dev/null
+++ b/usr.sbin/xntpd/lib/authusekey.c
@@ -0,0 +1,132 @@
+/* authusekey.c,v 3.1 1993/07/06 01:07:58 jbj Exp
+ * 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.
+ */
+#ifdef	DES
+#define	KEY_TYPE_STD	1
+#define	KEY_TYPE_NTP	2
+#define	KEY_TYPE_ASCII	3
+
+#define	STD_PARITY_BITS	0x01010101
+
+#endif
+
+#ifdef	MD5
+#define	KEY_TYPE_MD5	4
+#endif
+
+int
+authusekey(keyno, keytype, str)
+	U_LONG keyno;
+	int keytype;
+	const char *str;
+{
+	U_LONG key[2];
+	u_char keybytes[8];
+	const char *cp;
+	char *xdigit;
+	int len;
+	int i;
+	static char *hex = "0123456789abcdef";
+
+	cp = str;
+	len = strlen(cp);
+	if (len == 0)
+		return 0;
+
+	switch(keytype) {
+#ifdef	DES
+	case KEY_TYPE_STD:
+	case KEY_TYPE_NTP:
+		if (len != 16)		/* Lazy.  Should define constant */
+			return 0;
+		/*
+		 * Decode hex key.
+		 */
+		key[0] = 0;
+		key[1] = 0;
+		for (i = 0; i < 16; i++) {
+			if (!isascii(*cp))
+				return 0;
+			xdigit = strchr(hex, isupper(*cp) ? tolower(*cp) : *cp);
+			cp++;
+			if (xdigit == 0)
+				return 0;
+			key[i>>3] <<= 4;
+			key[i>>3] |= (U_LONG)(xdigit - hex) & 0xf;
+		}
+
+		/*
+		 * If this is an NTP format key, put it into NBS format
+		 */
+		if (keytype == KEY_TYPE_NTP) {
+			for (i = 0; i < 2; i++)
+				key[i] = ((key[i] << 1) & ~STD_PARITY_BITS)
+				    | ((key[i] >> 7) & STD_PARITY_BITS);
+		}
+
+		/*
+		 * Check the parity, reject the key if the check fails
+		 */
+		if (!DESauth_parity(key)) {
+			return 0;
+		}
+		
+		/*
+		 * We can't find a good reason not to use this key.
+		 * So use it.
+		 */
+		DESauth_setkey(keyno, key);
+		break;
+	
+	case KEY_TYPE_ASCII:
+		/*
+		 * Make up key from ascii representation
+		 */
+		bzero((char *) keybytes, sizeof(keybytes));
+		for (i = 0; i < 8 && i < len; i++)
+			keybytes[i] = *cp++ << 1;
+		key[0] = (U_LONG)keybytes[0] << 24 | (U_LONG)keybytes[1] << 16
+		    | (U_LONG)keybytes[2] << 8 | (U_LONG)keybytes[3];
+		key[1] = (U_LONG)keybytes[4] << 24 | (U_LONG)keybytes[5] << 16
+		    | (U_LONG)keybytes[6] << 8 | (U_LONG)keybytes[7];
+		
+		/*
+		 * Set parity on key
+		 */
+		(void)DESauth_parity(key);
+
+		/*
+		 * Now set key in.
+		 */
+		DESauth_setkey(keyno, key);
+		break;
+#endif
+
+#ifdef	MD5
+	case KEY_TYPE_MD5:
+	/* XXX FIXME: MD5auth_setkey() casts arg2 back to (char *) */
+		MD5auth_setkey(keyno, (U_LONG *)str);
+		break;
+#endif
+
+	default:
+		/* Oh, well */
+		return 0;
+	}
+
+	return 1;
+}