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openssl/crypto/modes/cfb128.c

Index: openssl/crypto/modes/cfb128.c
===================================================================
--- openssl/crypto/modes/cfb128.c	(revision 0)
+++ openssl/crypto/modes/cfb128.c	(revision 0)
@@ -0,0 +1,249 @@
+/* ====================================================================
+ * Copyright (c) 2008 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 "modes.h"
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+#define STRICT_ALIGNMENT
+#if defined(__i386) || defined(__i386__) || \
+    defined(__x86_64) || defined(__x86_64__) || \
+    defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
+    defined(__s390__) || defined(__s390x__)
+#  undef STRICT_ALIGNMENT
+#endif
+
+/* The input and output encrypted as though 128bit cfb mode is being
+ * used.  The extra state information to record how much of the
+ * 128bit block we have used is contained in *num;
+ */
+void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], int *num,
+			int enc, block128_f block)
+{
+    unsigned int n;
+    size_t l = 0;
+
+    assert(in && out && key && ivec && num);
+
+    n = *num;
+
+    if (enc) {
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+	if (16%sizeof(size_t) == 0) do {	/* always true actually */
+		while (n && len) {
+			*(out++) = ivec[n] ^= *(in++);
+			--len;
+			n = (n+1) % 16;
+		}
+#if defined(STRICT_ALIGNMENT)
+		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+			break;
+#endif
+		while (len>=16) {
+			(*block)(ivec, ivec, key);
+			for (; n<16; n+=sizeof(size_t)) {
+				*(size_t*)(out+n) =
+				*(size_t*)(ivec+n) ^= *(size_t*)(in+n);
+			}
+			len -= 16;
+			out += 16;
+			in  += 16;
+			n = 0;
+		}
+		if (len) {
+			(*block)(ivec, ivec, key);
+			while (len--) {
+				out[n] = ivec[n] ^= in[n];
+				++n;
+			}
+		}
+		*num = n;
+		return;
+	} while (0);
+	/* the rest would be commonly eliminated by x86* compiler */
+#endif
+	while (l<len) {
+		if (n == 0) {
+			(*block)(ivec, ivec, key);
+		}
+		out[l] = ivec[n] ^= in[l];
+		++l;
+		n = (n+1) % 16;
+	}
+	*num = n;
+    } else {
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+	if (16%sizeof(size_t) == 0) do {	/* always true actually */
+		while (n && len) {
+			unsigned char c;
+			*(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c;
+			--len;
+			n = (n+1) % 16;
+ 		}
+#if defined(STRICT_ALIGNMENT)
+		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+			break;
+#endif
+		while (len>=16) {
+			(*block)(ivec, ivec, key);
+			for (; n<16; n+=sizeof(size_t)) {
+				size_t t = *(size_t*)(in+n);
+				*(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t;
+				*(size_t*)(ivec+n) = t;
+			}
+			len -= 16;
+			out += 16;
+			in  += 16;
+			n = 0;
+		}
+		if (len) {
+			(*block)(ivec, ivec, key);
+			while (len--) {
+				unsigned char c;
+				out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c;
+				++n;
+			}
+ 		}
+		*num = n;
+		return;
+	} while (0);
+	/* the rest would be commonly eliminated by x86* compiler */
+#endif
+	while (l<len) {
+		unsigned char c;
+		if (n == 0) {
+			(*block)(ivec, ivec, key);
+		}
+		out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
+		++l;
+		n = (n+1) % 16;
+	}
+	*num=n;
+    }
+}
+
+/* This expects a single block of size nbits for both in and out. Note that
+   it corrupts any extra bits in the last byte of out */
+static void cfbr_encrypt_block(const unsigned char *in,unsigned char *out,
+			    int nbits,const void *key,
+			    unsigned char ivec[16],int enc,
+			    block128_f block)
+{
+    int n,rem,num;
+    unsigned char ovec[16*2 + 1];  /* +1 because we dererefence (but don't use) one byte off the end */
+
+    if (nbits<=0 || nbits>128) return;
+
+	/* fill in the first half of the new IV with the current IV */
+	memcpy(ovec,ivec,16);
+	/* construct the new IV */
+	(*block)(ivec,ivec,key);
+	num = (nbits+7)/8;
+	if (enc)	/* encrypt the input */
+	    for(n=0 ; n < num ; ++n)
+		out[n] = (ovec[16+n] = in[n] ^ ivec[n]);
+	else		/* decrypt the input */
+	    for(n=0 ; n < num ; ++n)
+		out[n] = (ovec[16+n] = in[n]) ^ ivec[n];
+	/* shift ovec left... */
+	rem = nbits%8;
+	num = nbits/8;
+	if(rem==0)
+	    memcpy(ivec,ovec+num,16);
+	else
+	    for(n=0 ; n < 16 ; ++n)
+		ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);
+
+    /* it is not necessary to cleanse ovec, since the IV is not secret */
+}
+
+/* N.B. This expects the input to be packed, MS bit first */
+void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out,
+		 	size_t bits, const void *key,
+			unsigned char ivec[16], int *num,
+			int enc, block128_f block)
+{
+    size_t n;
+    unsigned char c[1],d[1];
+
+    assert(in && out && key && ivec && num);
+    assert(*num == 0);
+
+    for(n=0 ; n<bits ; ++n)
+	{
+	c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
+	cfbr_encrypt_block(c,d,1,key,ivec,enc,block);
+	out[n/8]=(out[n/8]&~(1 << (unsigned int)(7-n%8))) |
+		 ((d[0]&0x80) >> (unsigned int)(n%8));
+	}
+}
+
+void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out,
+			size_t length, const void *key,
+			unsigned char ivec[16], int *num,
+			int enc, block128_f block)
+{
+    size_t n;
+
+    assert(in && out && key && ivec && num);
+    assert(*num == 0);
+
+    for(n=0 ; n<length ; ++n)
+	cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block);
+}
+