--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ssl/libcrypto/src/crypto/aes/aes_ctr.c	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,139 @@
+/* crypto/aes/aes_ctr.c -*- mode:C; c-file-style: "eay" -*- */
+/* ====================================================================
+ * Copyright (c) 1998-2002 The OpenSSL Project.  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.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ */
+
+#ifndef AES_DEBUG
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+#include <openssl/aes.h>
+#include "aes_locl.h"
+
+/* NOTE: the IV/counter CTR mode is big-endian.  The rest of the AES code
+ * is endian-neutral. */
+
+/* increment counter (128-bit int) by 1 */
+static void AES_ctr128_inc(unsigned char *counter) {
+	unsigned long c;
+
+	/* Grab bottom dword of counter and increment */
+	c = GETU32(counter + 12);
+	c++;	c &= 0xFFFFFFFF;
+	PUTU32(counter + 12, c);
+
+	/* if no overflow, we're done */
+	if (c)
+		return;
+
+	/* Grab 1st dword of counter and increment */
+	c = GETU32(counter +  8);
+	c++;	c &= 0xFFFFFFFF;
+	PUTU32(counter +  8, c);
+
+	/* if no overflow, we're done */
+	if (c)
+		return;
+
+	/* Grab 2nd dword of counter and increment */
+	c = GETU32(counter +  4);
+	c++;	c &= 0xFFFFFFFF;
+	PUTU32(counter +  4, c);
+
+	/* if no overflow, we're done */
+	if (c)
+		return;
+
+	/* Grab top dword of counter and increment */
+	c = GETU32(counter +  0);
+	c++;	c &= 0xFFFFFFFF;
+	PUTU32(counter +  0, c);
+}
+
+/* The input encrypted as though 128bit counter mode is being
+ * used.  The extra state information to record how much of the
+ * 128bit block we have used is contained in *num, and the
+ * encrypted counter is kept in ecount_buf.  Both *num and
+ * ecount_buf must be initialised with zeros before the first
+ * call to AES_ctr128_encrypt().
+ *
+ * This algorithm assumes that the counter is in the x lower bits
+ * of the IV (ivec), and that the application has full control over
+ * overflow and the rest of the IV.  This implementation takes NO
+ * responsability for checking that the counter doesn't overflow
+ * into the rest of the IV when incremented.
+ */
+EXPORT_C void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
+	const unsigned long length, const AES_KEY *key,
+	unsigned char ivec[AES_BLOCK_SIZE],
+	unsigned char ecount_buf[AES_BLOCK_SIZE],
+	unsigned int *num) {
+
+	unsigned int n;
+	unsigned long l=length;
+
+	assert(in && out && key && counter && num);
+	assert(*num < AES_BLOCK_SIZE);
+
+	n = *num;
+
+	while (l--) {
+		if (n == 0) {
+			AES_encrypt(ivec, ecount_buf, key);
+ 			AES_ctr128_inc(ivec);
+		}
+		*(out++) = *(in++) ^ ecount_buf[n];
+		n = (n+1) % AES_BLOCK_SIZE;
+	}
+
+	*num=n;
+}