128-bit block cipher modes consolidation. As consolidated functions

rely on indirect call to block functions, they are not as fast as
non-consolidated routines. However, performance loss(*) is within
measurement error and consolidation advantages are considered to
outweigh it.

(*) actually one can observe performance *improvement* on e.g.
    CBC benchmarks thanks to optimization, which also becomes
    shared among ciphers.

crypto/modes/Makefile

+#
+# OpenSSL/crypto/modes/Makefile
+#
+
+DIR=	modes
+TOP=	../..
+CC=	cc
+INCLUDES= -I.. -I$(TOP) -I../../include
+CFLAG=-g
+MAKEFILE=	Makefile
+AR=		ar r
+
+CFLAGS= $(INCLUDES) $(CFLAG)
+
+GENERAL=Makefile
+TEST=
+APPS=
+
+LIB=$(TOP)/libcrypto.a
+LIBSRC= cbc128.c ctr128.c cfb128.c ofb128.c
+LIBOBJ= cbc128.o ctr128.o cfb128.o ofb128.o
+
+SRC= $(LIBSRC)
+
+#EXHEADER= store.h str_compat.h
+EXHEADER= modes.h
+HEADER=	$(EXHEADER)
+
+ALL=    $(GENERAL) $(SRC) $(HEADER)
+
+top:
+	(cd ../..; $(MAKE) DIRS=crypto SDIRS=$(DIR) sub_all)
+
+all:	lib
+
+lib:	$(LIBOBJ)
+	$(AR) $(LIB) $(LIBOBJ)
+	$(RANLIB) $(LIB) || echo Never mind.
+	@touch lib
+
+files:
+	$(PERL) $(TOP)/util/files.pl Makefile >> $(TOP)/MINFO
+
+links:
+	@$(PERL) $(TOP)/util/mklink.pl ../../include/openssl $(EXHEADER)
+	@$(PERL) $(TOP)/util/mklink.pl ../../test $(TEST)
+	@$(PERL) $(TOP)/util/mklink.pl ../../apps $(APPS)
+
+install:
+	@[ -n "$(INSTALLTOP)" ] # should be set by top Makefile...
+	@headerlist="$(EXHEADER)"; for i in $$headerlist; \
+	do  \
+	(cp $$i $(INSTALL_PREFIX)$(INSTALLTOP)/include/openssl/$$i; \
+	chmod 644 $(INSTALL_PREFIX)$(INSTALLTOP)/include/openssl/$$i ); \
+	done;
+
+tags:
+	ctags $(SRC)
+
+tests:
+
+lint:
+	lint -DLINT $(INCLUDES) $(SRC)>fluff
+
+depend:
+	@[ -n "$(MAKEDEPEND)" ] # should be set by upper Makefile...
+	$(MAKEDEPEND) -- $(CFLAG) $(INCLUDES) $(DEPFLAG) -- $(PROGS) $(LIBSRC)
+
+dclean:
+	$(PERL) -pe 'if (/^# DO NOT DELETE THIS LINE/) {print; exit(0);}' $(MAKEFILE) >Makefile.new
+	mv -f Makefile.new $(MAKEFILE)
+
+clean:
+	rm -f *.o */*.o *.obj lib tags core .pure .nfs* *.old *.bak fluff
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+cbc128.o: cbc128.c modes.h
+cfb128.o: cfb128.c modes.h
+ctr128.o: ctr128.c modes.h
+ofb128.o: modes.h ofb128.c

crypto/modes/cbc128.c

+/* ====================================================================
+ * 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 <stddef.h>
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+#include "modes.h"
+
+#define STRICT_ALIGNMENT 1
+#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
+#  define STRICT_ALIGNMENT 0
+#endif
+
+void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], block_f block)
+{
+	size_t n;
+	const unsigned char *iv = ivec;
+
+	assert(in && out && key && ivec);
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+	if (STRICT_ALIGNMENT &&
+	    ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
+		while (len>=16) {
+			for(n=0; n<16; ++n)
+				out[n] = in[n] ^ iv[n];
+			(*block)(out, out, key);
+			iv = out;
+			len -= 16;
+			in  += 16;
+			out += 16;
+		}
+	} else {
+		while (len>=16) {
+			for(n=0; n<16; n+=sizeof(size_t))
+				*(size_t*)(out+n) =
+				*(size_t*)(in+n) ^ *(size_t*)(iv+n);
+			(*block)(out, out, key);
+			iv = out;
+			len -= 16;
+			in  += 16;
+			out += 16;
+		}
+	}
+#endif
+	while (len) {
+		for(n=0; n<16 && n<len; ++n)
+			out[n] = in[n] ^ iv[n];
+		for(; n<16; ++n)
+			out[n] = iv[n];
+		(*block)(out, out, key);
+		iv = out;
+		if (len<=16) break;
+		len -= 16;
+		in  += 16;
+		out += 16;
+	}
+	memcpy(ivec,iv,16);
+}
+
+void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], block_f block)
+{
+	size_t n;
+	union { size_t align; unsigned char c[16]; } tmp;
+
+	assert(in && out && key && ivec);
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+	if (in != out) {
+		const unsigned char *iv = ivec;
+
+		if (STRICT_ALIGNMENT &&
+		    ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
+			while (len>=16) {
+				(*block)(in, out, key);
+				for(n=0; n<16; ++n)
+					out[n] ^= iv[n];
+				iv = in;
+				len -= 16;
+				in  += 16;
+				out += 16;
+			}
+		}
+		else {
+			while (len>=16) {
+				(*block)(in, out, key);
+				for(n=0; n<16; n+=sizeof(size_t))
+					*(size_t *)(out+n) ^= *(size_t *)(iv+n);
+				iv = in;
+				len -= 16;
+				in  += 16;
+				out += 16;
+			}
+		}
+		memcpy(ivec,iv,16);
+	} else {
+		if (STRICT_ALIGNMENT &&
+		    ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
+			unsigned char c;
+			while (len>=16) {
+				(*block)(in, tmp.c, key);
+				for(n=0; n<16; ++n) {
+					c = in[n];
+					out[n] = tmp.c[n] ^ ivec[n];
+					ivec[n] = c;
+				}
+				len -= 16;
+				in  += 16;
+				out += 16;
+			}
+		}
+		else {
+			size_t c;
+			while (len>=16) {
+				(*block)(in, tmp.c, key);
+				for(n=0; n<16; n+=sizeof(size_t)) {
+					c = *(size_t *)(in+n);
+					*(size_t *)(out+n) =
+					*(size_t *)(tmp.c+n) ^ *(size_t *)(ivec+n);
+					*(size_t *)(ivec+n) = c;
+				}
+				len -= 16;
+				in  += 16;
+				out += 16;
+			}
+		}
+	}
+#endif
+	while (len) {
+		unsigned char c;
+		(*block)(in, tmp.c, key);
+		for(n=0; n<16 && n<len; ++n) {
+			c = in[n];
+			out[n] = tmp.c[n] ^ ivec[n];
+			ivec[n] = c;
+		}
+		if (len<=16) {
+			for (; n<16; ++n)
+				ivec[n] = in[n];
+			break;
+		}
+		len -= 16;
+		in  += 16;
+		out += 16;
+	}
+}

crypto/modes/cfb128.c

+/* ====================================================================
+ * 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 <stddef.h>
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+#include "modes.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, block_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=0; 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=0; 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,
+			    block_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, block_f block)
+{
+    size_t n;
+    unsigned char c[1],d[1];
+
+    assert(in && out && key && ivec && num);
+    assert(*num == 0);
+
+    memset(out,0,(bits+7)/8);
+    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 << (7-n%8)))|((d[0]&0x80) >> (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, block_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);
+}
+

crypto/modes/ctr128.c

+/* ====================================================================
+ * 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 <stddef.h>
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+#include "modes.h"
+
+typedef unsigned int u32;
+typedef unsigned char u8;
+
+# define GETU32(pt) (((u32)(pt)[0] << 24) ^ ((u32)(pt)[1] << 16) ^ ((u32)(pt)[2] <<  8) ^ ((u32)(pt)[3]))
+# define PUTU32(ct, st) { (ct)[0] = (u8)((st) >> 24); (ct)[1] = (u8)((st) >> 16); (ct)[2] = (u8)((st) >>  8); (ct)[3] = (u8)(st); }
+
+#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
+
+/* NOTE: the IV/counter CTR mode is big-endian.  The code itself
+ * is endian-neutral. */
+
+/* increment counter (128-bit int) by 1 */
+static void ctr128_inc(unsigned char *counter) {
+	u32 c,n=16;
+
+	do {
+		n -= 4;
+		c = GETU32(counter+n);
+		++c;	c &= 0xFFFFFFFF;
+		PUTU32(counter + n, c);
+		if (c) return;
+	} while (n);
+}
+
+#if !defined(OPENSSL_SMALL_FOORPRINT)
+static void ctr128_inc_aligned(unsigned char *counter) {
+	size_t *data,c,n;
+	const union { long one; char little; } is_endian = {1};
+
+	if (is_endian.little) {
+		ctr128_inc(counter);
+		return;
+	}
+
+	data = (size_t *)counter;
+	n = 16/sizeof(size_t);
+	do {
+		--n;
+		c = data[n];
+		++c;
+		data[n] = c;
+		if (c) return;
+	} while (n);
+}
+#endif
+
+/* 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 CRYPTO_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.
+ */
+void CRYPTO_ctr128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], unsigned char ecount_buf[16],
+			unsigned int *num, block_f block)
+{
+	unsigned int n;
+	size_t l=0;
+
+	assert(in && out && key && ecount_buf && num);
+	assert(*num < 16);
+
+	n = *num;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+	if (16%sizeof(size_t) == 0) do { /* always true actually */
+		while (n && len) {
+			*(out++) = *(in++) ^ ecount_buf[n];
+			--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, ecount_buf, key);
+			ctr128_inc_aligned(ivec);
+			for (n=0; n<16; n+=sizeof(size_t))
+				*(size_t *)(out+n) =
+				*(size_t *)(in+n) ^ *(size_t *)(ecount_buf+n);
+			len -= 16;
+			out += 16;
+			in  += 16;
+		}
+		n = 0;
+		if (len) {
+			(*block)(ivec, ecount_buf, key);
+ 			ctr128_inc_aligned(ivec);
+			while (len--) {
+				out[n] = in[n] ^ ecount_buf[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, ecount_buf, key);
+ 			ctr128_inc(ivec);
+		}
+		out[l] = in[l] ^ ecount_buf[n];
+		++l;
+		n = (n+1) % 16;
+	}
+
+	*num=n;
+}

crypto/modes/modes.h

+typedef void (*block_f)(const unsigned char in[16],
+			unsigned char out[16],
+			const void *key);
+
+void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], block_f block);
+void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], block_f block);
+
+void CRYPTO_ctr128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], unsigned char ecount_buf[16],
+			unsigned int *num, block_f block);
+
+void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], int *num,
+			block_f block);
+
+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, block_f block);
+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, block_f block);
+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, block_f block);
+

crypto/modes/ofb128.c

+/* ====================================================================
+ * 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 <stddef.h>
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+#include "modes.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 ofb 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_ofb128_encrypt(const unsigned char *in, unsigned char *out,
+			size_t len, const void *key,
+			unsigned char ivec[16], int *num,
+			block_f block)
+{
+	unsigned int n;
+	size_t l=0;
+
+	assert(in && out && key && ivec && num);
+
+	n = *num;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+	if (16%sizeof(size_t) == 0) do { /* always true actually */
+		while (n && len) {
+			*(out++) = *(in++) ^ ivec[n];
+			--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=0; n<16; n+=sizeof(size_t))
+				*(size_t*)(out+n) =
+				*(size_t*)(in+n) ^ *(size_t*)(ivec+n);
+			len -= 16;
+			out += 16;
+			in  += 16;
+		}
+		n = 0;
+		if (len) {
+			(*block)(ivec, ivec, key);
+			while (len--) {
+				out[n] = in[n] ^ ivec[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] = in[l] ^ ivec[n];
+		++l;
+		n = (n+1) % 16;
+	}
+
+	*num=n;
+}