Nates password scrambler, from FreebSD 1.1.5, but with everything except

crypt() ripped out
Reviewed by:	Geoff Rehmet
Submitted by:	Nate Williams

1 files changed, 184 insertions, 0 deletions

diff --git a/lib/libcrypt/crypt.c b/lib/libcrypt/crypt.c
new file mode 100644
index 0000000..d72660d
--- /dev/null
+++ b/lib/libcrypt/crypt.c
@@ -0,0 +1,184 @@
+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Tom Truscott.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+/* from static char sccsid[] = "@(#)crypt.c	5.11 (Berkeley) 6/25/91"; */
+static char rcsid[] = "$Header: /a/cvs/386BSD/src/lib/libc/gen/crypt.c,v 1.6 1993/08/29 22:03:56 nate Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <unistd.h>
+#include <stdio.h>
+
+/*
+ * UNIX password
+ * 
+ * This is just a scrambler which can be used in the case when the
+ * real libcrypt is not around.
+ *
+ * Developed by Nate Williams
+ */
+
+char *
+crypt(pw, salt)
+	register const char *pw;
+	register const char *salt;
+{
+	static char     password[14];
+	long            matrix[128], *m, vector[2];
+	char            a, b, *p;
+	int             i, value;
+	unsigned short  crc;
+	unsigned long   t;
+
+	/* Ugly hack, but I'm too lazy to find the real problem - NW */
+	bzero(matrix, 128 * sizeof(long));
+
+	if (salt[0]) {
+		a = salt[0];
+		if (salt[1])
+			b = salt[1];
+		else
+			b = a;
+	} else
+		a = b = '0';
+	password[0] = a;
+	password[1] = b;
+	if (a > 'Z')
+		a -= 6;
+	if (a > '9')
+		a -= 7;
+	if (b > 'Z')
+		b -= 6;
+	if (b > '9')
+		b -= 7;
+	a -= '.';
+	b -= '.';
+	value = (a | (b << 6)) & 07777;
+
+	crc = value;
+	value += 1000;
+	b = 0;
+	p = (char *)pw;
+	while (value--) {
+		if (crc & 0x8000)
+			crc = (crc << 1) ^ 0x1021;
+		else
+			crc <<= 1;
+		if (!b) {
+			b = 8;
+			if (!(i = *p++)) {
+				p = (char *)pw;
+				i = *p++;
+			}
+		}
+		if (i & 0x80)
+			crc ^= 1;
+		i <<= 1;
+		b--;
+	}
+
+	m = matrix;
+	matrix[0] = 0;
+	a = 32;
+	for (value = 07777; value >= 0; value--) {
+		*m <<= 1;
+		if (crc & 0x8000) {
+			*m |= 1;
+			crc = (crc << 1) ^ 0x1021;
+		} else
+			crc <<= 1;
+		if (!b) {
+			b = 8;
+			if (!(i = *p++)) {
+				p = (char *)pw;
+				i = *p++;
+			}
+		}
+		if (i & 0x80)
+			crc ^= 1;
+		i <<= 1;
+		b--;
+		if (!(a--)) {
+			a = 32;
+			*++m = 0;
+		}
+	}
+
+	vector[0] = 0;
+	vector[1] = 0;
+	p = (char *) vector;
+	for (i = 0; i < 7; i++)
+		if (pw[i])
+			*p++ = pw[i];
+		else
+			break;
+
+	p = password + 2;
+	a = 6;
+	m = matrix;
+	*p = 0;
+	for (i = 077; i >= 0; i--) {
+		t = *m++;
+		t = t ^ *m++;
+		t = t ^ vector[0];
+		t = t ^ vector[1];
+		b = 0;
+		while (t) {
+			if (t & 1)
+				b = 1 - b;
+			t >>= 1;
+		}
+		a--;
+		if (b)
+			*p |= 1 << a;
+		if (!a) {
+			a = 6;
+			*++p = 0;
+		}
+	}
+
+	for (i = 2; i < 13; i++) {
+		password[i] += '.';
+		if (password[i] > '9')
+			password[i] += 7;
+		if (password[i] > 'Z')
+			password[i] += 6;
+	}
+	password[13] = 0;
+
+	return password;
+}
+