Forward port of IGE mode.

1 files changed, 283 insertions, 0 deletions

diff --git a/crypto/aes/aes_ige.c b/crypto/aes/aes_ige.c
new file mode 100644
index 0000000000..eda7922c6d
--- /dev/null
+++ b/crypto/aes/aes_ige.c
@@ -0,0 +1,283 @@
+/* crypto/aes/aes_ige.c -*- mode:C; c-file-style: "eay" -*- */
+/* ====================================================================
+ * Copyright (c) 2006 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.
+ * ====================================================================
+ *
+ */
+
+#include <assert.h>
+
+#include <openssl/aes.h>
+#include "aes_locl.h"
+
+/*
+static void hexdump(FILE *f,const char *title,const unsigned char *s,int l)
+    {
+    int n=0;
+
+    fprintf(f,"%s",title);
+    for( ; n < l ; ++n)
+		{
+		if((n%16) == 0)
+			fprintf(f,"\n%04x",n);
+		fprintf(f," %02x",s[n]);
+		}
+    fprintf(f,"\n");
+    }
+*/
+
+/* N.B. The IV for this mode is _twice_ the block size */
+
+void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
+					 const unsigned long length, const AES_KEY *key,
+					 unsigned char *ivec, const int enc)
+	{
+	unsigned long n;
+	unsigned long len = length;
+	unsigned char tmp[AES_BLOCK_SIZE];
+	unsigned char tmp2[AES_BLOCK_SIZE];
+	unsigned char prev[AES_BLOCK_SIZE];
+	const unsigned char *iv = ivec;
+	const unsigned char *iv2 = ivec + AES_BLOCK_SIZE;
+
+	assert(in && out && key && ivec);
+	assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
+	assert((length%AES_BLOCK_SIZE) == 0);
+
+	if (AES_ENCRYPT == enc)
+		{
+		/* XXX: Do a separate case for when in != out (strictly should
+		   check for overlap, too) */
+		while (len >= AES_BLOCK_SIZE)
+			{
+			//			hexdump(stdout, "in", in, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] = in[n] ^ iv[n];
+			//			hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE);
+			AES_encrypt(out, out, key);
+			//			hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= iv2[n];
+			//			hexdump(stdout,"out", out, AES_BLOCK_SIZE);
+			iv = out;
+			memcpy(prev, in, AES_BLOCK_SIZE);
+			iv2 = prev;
+			len -= AES_BLOCK_SIZE;
+			in += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
+			}
+		memcpy(ivec, iv, AES_BLOCK_SIZE);
+		memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE);
+		}
+	else
+		{
+		while (len >= AES_BLOCK_SIZE)
+			{
+			memcpy(tmp, in, AES_BLOCK_SIZE);
+			memcpy(tmp2, in, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "in", in, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				tmp[n] ^= iv2[n];
+			//			hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE);
+			AES_decrypt(tmp, out, key);
+			//			hexdump(stdout, "dec", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= ivec[n];
+			//			hexdump(stdout, "out", out, AES_BLOCK_SIZE);
+			memcpy(ivec, tmp2, AES_BLOCK_SIZE);
+			iv2 = out;
+			len -= AES_BLOCK_SIZE;
+			in += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
+			}
+		memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE);
+		}
+	}
+
+/*
+ * Note that its effectively impossible to do biIGE in anything other
+ * than a single pass, so no provision is made for chaining.
+ */
+
+/* N.B. The IV for this mode is _four times_ the block size */
+
+void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
+						const unsigned long length, const AES_KEY *key,
+						const AES_KEY *key2, const unsigned char *ivec,
+						const int enc)
+	{
+	unsigned long n;
+	unsigned long len = length;
+	unsigned char tmp[AES_BLOCK_SIZE];
+	unsigned char tmp2[AES_BLOCK_SIZE];
+	unsigned char tmp3[AES_BLOCK_SIZE];
+	unsigned char prev[AES_BLOCK_SIZE];
+	const unsigned char *iv;
+	const unsigned char *iv2;
+
+	assert(in && out && key && ivec);
+	assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
+	assert((length%AES_BLOCK_SIZE) == 0);
+
+	if (AES_ENCRYPT == enc)
+		{
+		/* XXX: Do a separate case for when in != out (strictly should
+		   check for overlap, too) */
+
+		/* First the forward pass */ 
+		iv = ivec;
+		iv2 = ivec + AES_BLOCK_SIZE;
+		while (len >= AES_BLOCK_SIZE)
+			{
+			//			hexdump(stdout, "in", in, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] = in[n] ^ iv[n];
+			//			hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE);
+			AES_encrypt(out, out, key);
+			//			hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= iv2[n];
+			//			hexdump(stdout,"out", out, AES_BLOCK_SIZE);
+			iv = out;
+			memcpy(prev, in, AES_BLOCK_SIZE);
+			iv2 = prev;
+			len -= AES_BLOCK_SIZE;
+			in += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
+			}
+
+		/* And now backwards */
+		iv = ivec + AES_BLOCK_SIZE*2;
+		iv2 = ivec + AES_BLOCK_SIZE*3;
+		len = length;
+		while(len >= AES_BLOCK_SIZE)
+			{
+			out -= AES_BLOCK_SIZE;
+			//			hexdump(stdout, "intermediate", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
+			// XXX: reduce copies by alternating between buffers
+			memcpy(tmp, out, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= iv[n];
+			//			hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE);
+			AES_encrypt(out, out, key);
+			//			hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= iv2[n];
+			//			hexdump(stdout,"out", out, AES_BLOCK_SIZE);
+			iv = out;
+			memcpy(prev, tmp, AES_BLOCK_SIZE);
+			iv2 = prev;
+			len -= AES_BLOCK_SIZE;
+			}
+		}
+	else
+		{
+		/* First backwards */
+		iv = ivec + AES_BLOCK_SIZE*2;
+		iv2 = ivec + AES_BLOCK_SIZE*3;
+		in += length;
+		out += length;
+		while (len >= AES_BLOCK_SIZE)
+			{
+			in -= AES_BLOCK_SIZE;
+			out -= AES_BLOCK_SIZE;
+			memcpy(tmp, in, AES_BLOCK_SIZE);
+			memcpy(tmp2, in, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "in", in, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				tmp[n] ^= iv2[n];
+			//			hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE);
+			AES_decrypt(tmp, out, key);
+			//			hexdump(stdout, "dec", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= iv[n];
+			//			hexdump(stdout, "out", out, AES_BLOCK_SIZE);
+			memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
+			iv = tmp3;
+			iv2 = out;
+			len -= AES_BLOCK_SIZE;
+			}
+
+		/* And now forwards */
+		iv = ivec;
+		iv2 = ivec + AES_BLOCK_SIZE;
+		len = length;
+		while (len >= AES_BLOCK_SIZE)
+			{
+			memcpy(tmp, out, AES_BLOCK_SIZE);
+			memcpy(tmp2, out, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "intermediate", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				tmp[n] ^= iv2[n];
+			//			hexdump(stdout, "out ^ iv2", tmp, AES_BLOCK_SIZE);
+			AES_decrypt(tmp, out, key);
+			//			hexdump(stdout, "dec", out, AES_BLOCK_SIZE);
+			//			hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE);
+			for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+				out[n] ^= iv[n];
+			//			hexdump(stdout, "out", out, AES_BLOCK_SIZE);
+			memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
+			iv = tmp3;
+			iv2 = out;
+			len -= AES_BLOCK_SIZE;
+			in += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
+			}
+
+		}
+	}