1 files changed, 230 insertions, 0 deletions
diff --git a/crypto/openssh/bufaux.c b/crypto/openssh/bufaux.c
new file mode 100644
index 0000000..192c0c5
--- /dev/null
+++ b/crypto/openssh/bufaux.c
@@ -0,0 +1,230 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * Auxiliary functions for storing and retrieving various data types to/from
+ * Buffers.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * SSH2 packet format added by Markus Friedl
+ * Copyright (c) 2000 Markus Friedl.  All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: bufaux.c,v 1.13 2000/09/07 20:27:50 deraadt Exp $");
+RCSID("$FreeBSD$");
+
+#include "ssh.h"
+#include <openssl/bn.h>
+#include "bufaux.h"
+#include "xmalloc.h"
+#include "getput.h"
+
+/*
+ * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed
+ * by (bits+7)/8 bytes of binary data, msb first.
+ */
+void
+buffer_put_bignum(Buffer *buffer, BIGNUM *value)
+{
+	int bits = BN_num_bits(value);
+	int bin_size = (bits + 7) / 8;
+	char unsigned *buf = xmalloc(bin_size);
+	int oi;
+	char msg[2];
+
+	/* Get the value of in binary */
+	oi = BN_bn2bin(value, buf);
+	if (oi != bin_size)
+		fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d",
+		      oi, bin_size);
+
+	/* Store the number of bits in the buffer in two bytes, msb first. */
+	PUT_16BIT(msg, bits);
+	buffer_append(buffer, msg, 2);
+	/* Store the binary data. */
+	buffer_append(buffer, (char *)buf, oi);
+
+	memset(buf, 0, bin_size);
+	xfree(buf);
+}
+
+/*
+ * Retrieves an BIGNUM from the buffer.
+ */
+int
+buffer_get_bignum(Buffer *buffer, BIGNUM *value)
+{
+	int bits, bytes;
+	unsigned char buf[2], *bin;
+
+	/* Get the number for bits. */
+	buffer_get(buffer, (char *) buf, 2);
+	bits = GET_16BIT(buf);
+	/* Compute the number of binary bytes that follow. */
+	bytes = (bits + 7) / 8;
+	if (buffer_len(buffer) < bytes)
+		fatal("buffer_get_bignum: input buffer too small");
+	bin = (unsigned char*) buffer_ptr(buffer);
+	BN_bin2bn(bin, bytes, value);
+	buffer_consume(buffer, bytes);
+
+	return 2 + bytes;
+}
+
+/*
+ * Stores an BIGNUM in the buffer in SSH2 format.
+ */
+void
+buffer_put_bignum2(Buffer *buffer, BIGNUM *value)
+{
+	int bytes = BN_num_bytes(value) + 1;
+	unsigned char *buf = xmalloc(bytes);
+	int oi;
+	int hasnohigh = 0;
+	buf[0] = '\0';
+	/* Get the value of in binary */
+	oi = BN_bn2bin(value, buf+1);
+	if (oi != bytes-1)
+		fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d",
+		      oi, bytes);
+	hasnohigh = (buf[1] & 0x80) ? 0 : 1;
+	if (value->neg) {
+		/**XXX should be two's-complement */
+		int i, carry;
+		unsigned char *uc = buf;
+		log("negativ!");
+		for(i = bytes-1, carry = 1; i>=0; i--) {
+			uc[i] ^= 0xff;
+			if(carry)
+				carry = !++uc[i];
+		}
+	}
+	buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh);
+	memset(buf, 0, bytes);
+	xfree(buf);
+}
+
+int
+buffer_get_bignum2(Buffer *buffer, BIGNUM *value)
+{
+	/**XXX should be two's-complement */
+	int len;
+	unsigned char *bin = (unsigned char *)buffer_get_string(buffer, (unsigned int *)&len);
+	BN_bin2bn(bin, len, value);
+	xfree(bin);
+	return len;
+}
+
+/*
+ * Returns an integer from the buffer (4 bytes, msb first).
+ */
+unsigned int
+buffer_get_int(Buffer *buffer)
+{
+	unsigned char buf[4];
+	buffer_get(buffer, (char *) buf, 4);
+	return GET_32BIT(buf);
+}
+
+/*
+ * Stores an integer in the buffer in 4 bytes, msb first.
+ */
+void
+buffer_put_int(Buffer *buffer, unsigned int value)
+{
+	char buf[4];
+	PUT_32BIT(buf, value);
+	buffer_append(buffer, buf, 4);
+}
+
+/*
+ * Returns an arbitrary binary string from the buffer.  The string cannot
+ * be longer than 256k.  The returned value points to memory allocated
+ * with xmalloc; it is the responsibility of the calling function to free
+ * the data.  If length_ptr is non-NULL, the length of the returned data
+ * will be stored there.  A null character will be automatically appended
+ * to the returned string, and is not counted in length.
+ */
+char *
+buffer_get_string(Buffer *buffer, unsigned int *length_ptr)
+{
+	unsigned int len;
+	char *value;
+	/* Get the length. */
+	len = buffer_get_int(buffer);
+	if (len > 256 * 1024)
+		fatal("Received packet with bad string length %d", len);
+	/* Allocate space for the string.  Add one byte for a null character. */
+	value = xmalloc(len + 1);
+	/* Get the string. */
+	buffer_get(buffer, value, len);
+	/* Append a null character to make processing easier. */
+	value[len] = 0;
+	/* Optionally return the length of the string. */
+	if (length_ptr)
+		*length_ptr = len;
+	return value;
+}
+
+/*
+ * Stores and arbitrary binary string in the buffer.
+ */
+void
+buffer_put_string(Buffer *buffer, const void *buf, unsigned int len)
+{
+	buffer_put_int(buffer, len);
+	buffer_append(buffer, buf, len);
+}
+void
+buffer_put_cstring(Buffer *buffer, const char *s)
+{
+	buffer_put_string(buffer, s, strlen(s));
+}
+
+/*
+ * Returns a character from the buffer (0 - 255).
+ */
+int
+buffer_get_char(Buffer *buffer)
+{
+	char ch;
+	buffer_get(buffer, &ch, 1);
+	return (unsigned char) ch;
+}
+
+/*
+ * Stores a character in the buffer.
+ */
+void
+buffer_put_char(Buffer *buffer, int value)
+{
+	char ch = value;
+	buffer_append(buffer, &ch, 1);
+}