From ef64b99e8412f2273dd2e8b3291c2f78ffc4667f Mon Sep 17 00:00:00 2001
From: roberto <roberto@FreeBSD.org>
Date: Thu, 9 Dec 1999 13:01:21 +0000
Subject: Virgin import of ntpd 4.0.98f

---
 contrib/ntp/libntp/authusekey.c | 134 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 contrib/ntp/libntp/authusekey.c

(limited to 'contrib/ntp/libntp/authusekey.c')

diff --git a/contrib/ntp/libntp/authusekey.c b/contrib/ntp/libntp/authusekey.c
new file mode 100644
index 0000000..a399a48
--- /dev/null
+++ b/contrib/ntp/libntp/authusekey.c
@@ -0,0 +1,134 @@
+/*
+ * 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	((unsigned)0x01010101)
+
+#endif
+
+#ifdef	MD5
+#define	KEY_TYPE_MD5	4
+#endif
+
+int
+authusekey(
+	u_long keyno,
+	int keytype,
+	const u_char *str
+	)
+{
+#ifdef DES
+	u_int32 key[2];
+	u_char keybytes[8];
+	char *xdigit;
+	int i;
+	static const char *hex = "0123456789abcdef";
+#endif
+	const u_char *cp;
+	int len;
+
+	cp = str;
+	len = strlen((const char *)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_int32)(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
+		 */
+		memset((char *) keybytes, 0, sizeof(keybytes));
+		for (i = 0; i < 8 && i < len; i++)
+		    keybytes[i] = *cp++ << 1;
+		key[0] = (u_int32)keybytes[0] << 24 | (u_int32)keybytes[1] << 16
+			| (u_int32)keybytes[2] << 8 | (u_int32)keybytes[3];
+		key[1] = (u_int32)keybytes[4] << 24 | (u_int32)keybytes[5] << 16
+			| (u_int32)keybytes[6] << 8 | (u_int32)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:
+		MD5auth_setkey(keyno, str, (int)strlen((const char *)str));
+		break;
+#endif
+
+	    default:
+		/* Oh, well */
+		return 0;
+	}
+
+	return 1;
+}
-- 
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