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libressl/0030-modes-add-functions-implementing-common-code-for-64-.patch
Mikhail Novosyolov faac7d3eaa Add gost-new patches sponsored by ROSA Linux 
TODO: add tests
2020-08-05 12:58:06 +03:00

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From ea7314c1d00c3d63636dd769f0cec60b7e42e79d Mon Sep 17 00:00:00 2001
From: Dmitry Baryshkov <dbaryshkov@gmail.com>
Date: Fri, 20 Mar 2020 00:39:56 +0300
Subject: [PATCH 30/87] modes: add functions implementing common code for
64-bit ciphers
64-bit ciphers are old, but it would be good to use common code for
their implementations.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
---
src/lib/libcrypto/modes/cbc64.c | 202 ++++++++++++++++++++++++++++++++
src/lib/libcrypto/modes/cfb64.c | 169 ++++++++++++++++++++++++++
src/lib/libcrypto/modes/ctr64.c | 174 +++++++++++++++++++++++++++
src/lib/libcrypto/modes/modes.h | 26 ++++
src/lib/libcrypto/modes/ofb64.c | 119 +++++++++++++++++++
5 files changed, 690 insertions(+)
create mode 100644 src/lib/libcrypto/modes/cbc64.c
create mode 100644 src/lib/libcrypto/modes/cfb64.c
create mode 100644 src/lib/libcrypto/modes/ctr64.c
create mode 100644 src/lib/libcrypto/modes/ofb64.c
diff --git a/src/lib/libcrypto/modes/cbc64.c b/src/lib/libcrypto/modes/cbc64.c
new file mode 100644
index 000000000..ec65ac5d3
--- /dev/null
+++ b/src/lib/libcrypto/modes/cbc64.c
@@ -0,0 +1,202 @@
+/* $OpenBSD: cbc64.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
+/* ====================================================================
+ * 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 <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+# define NDEBUG
+# endif
+#endif
+
+#undef STRICT_ALIGNMENT
+#ifdef __STRICT_ALIGNMENT
+#define STRICT_ALIGNMENT 1
+#else
+#define STRICT_ALIGNMENT 0
+#endif
+
+void CRYPTO_cbc64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], block64_f block)
+{
+ size_t n;
+ const unsigned char *iv = ivec;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+ if (STRICT_ALIGNMENT &&
+ ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
+ while (len>=8) {
+ for(n=0; n<8; ++n)
+ out[n] = in[n] ^ iv[n];
+ (*block)(out, out, key);
+ iv = out;
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ } else {
+ while (len>=8) {
+ for(n=0; n<8; n+=sizeof(size_t))
+ *(size_t*)(out+n) =
+ *(size_t*)(in+n) ^ *(size_t*)(iv+n);
+ (*block)(out, out, key);
+ iv = out;
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ }
+#endif
+ while (len) {
+ for(n=0; n<8 && n<len; ++n)
+ out[n] = in[n] ^ iv[n];
+ for(; n<8; ++n)
+ out[n] = iv[n];
+ (*block)(out, out, key);
+ iv = out;
+ if (len<=8) break;
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ memcpy(ivec,iv,8);
+}
+
+void CRYPTO_cbc64_decrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], block64_f block)
+{
+ size_t n;
+ union { size_t t[8/sizeof(size_t)]; unsigned char c[8]; } tmp;
+
+#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>=8) {
+ (*block)(in, out, key);
+ for(n=0; n<8; ++n)
+ out[n] ^= iv[n];
+ iv = in;
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ } else if (8%sizeof(size_t) == 0) { /* always true */
+ while (len>=8) {
+ size_t *out_t=(size_t *)out, *iv_t=(size_t *)iv;
+
+ (*block)(in, out, key);
+ for(n=0; n<8/sizeof(size_t); n++)
+ out_t[n] ^= iv_t[n];
+ iv = in;
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ }
+ memcpy(ivec,iv,8);
+ } else {
+ if (STRICT_ALIGNMENT &&
+ ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
+ unsigned char c;
+ while (len>=8) {
+ (*block)(in, tmp.c, key);
+ for(n=0; n<8; ++n) {
+ c = in[n];
+ out[n] = tmp.c[n] ^ ivec[n];
+ ivec[n] = c;
+ }
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ } else if (8%sizeof(size_t) == 0) { /* always true */
+ while (len>=8) {
+ size_t c, *out_t=(size_t *)out, *ivec_t=(size_t *)ivec;
+ const size_t *in_t=(const size_t *)in;
+
+ (*block)(in, tmp.c, key);
+ for(n=0; n<8/sizeof(size_t); n++) {
+ c = in_t[n];
+ out_t[n] = tmp.t[n] ^ ivec_t[n];
+ ivec_t[n] = c;
+ }
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+ }
+ }
+#endif
+ while (len) {
+ unsigned char c;
+ (*block)(in, tmp.c, key);
+ for(n=0; n<8 && n<len; ++n) {
+ c = in[n];
+ out[n] = tmp.c[n] ^ ivec[n];
+ ivec[n] = c;
+ }
+ if (len<=8) {
+ for (; n<8; ++n)
+ ivec[n] = in[n];
+ break;
+ }
+ len -= 8;
+ in += 8;
+ out += 8;
+ }
+}
diff --git a/src/lib/libcrypto/modes/cfb64.c b/src/lib/libcrypto/modes/cfb64.c
new file mode 100644
index 000000000..f335fa39c
--- /dev/null
+++ b/src/lib/libcrypto/modes/cfb64.c
@@ -0,0 +1,169 @@
+/* $OpenBSD: cfb64.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
+/* ====================================================================
+ * 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 <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+# define NDEBUG
+# endif
+#endif
+
+/* The input and output encrypted as though 64bit cfb mode is being
+ * used. The extra state information to record how much of the
+ * 64bit block we have used is contained in *num;
+ */
+void CRYPTO_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], int *num,
+ int enc, block64_f block)
+{
+ unsigned int n;
+ size_t l = 0;
+
+ n = *num;
+
+ if (enc) {
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+ if (8%sizeof(size_t) == 0) do { /* always true actually */
+ while (n && len) {
+ *(out++) = ivec[n] ^= *(in++);
+ --len;
+ n = (n+1) % 8;
+ }
+#ifdef __STRICT_ALIGNMENT
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+ break;
+#endif
+ while (len>=8) {
+ (*block)(ivec, ivec, key);
+ for (; n<8; n+=sizeof(size_t)) {
+ *(size_t*)(out+n) =
+ *(size_t*)(ivec+n) ^= *(size_t*)(in+n);
+ }
+ len -= 8;
+ out += 8;
+ in += 8;
+ 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) % 8;
+ }
+ *num = n;
+ } else {
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+ if (8%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) % 8;
+ }
+#ifdef __STRICT_ALIGNMENT
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+ break;
+#endif
+ while (len>=8) {
+ (*block)(ivec, ivec, key);
+ for (; n<8; 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 -= 8;
+ out += 8;
+ in += 8;
+ 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) % 8;
+ }
+ *num=n;
+ }
+}
diff --git a/src/lib/libcrypto/modes/ctr64.c b/src/lib/libcrypto/modes/ctr64.c
new file mode 100644
index 000000000..e1743cb91
--- /dev/null
+++ b/src/lib/libcrypto/modes/ctr64.c
@@ -0,0 +1,174 @@
+/* $OpenBSD: ctr64.c,v 1.7 2017/08/13 17:46:24 bcook Exp $ */
+/* ====================================================================
+ * 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 <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+# define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+/* NOTE: the IV/counter CTR mode is big-endian. The code itself
+ * is endian-neutral. */
+
+/* increment counter (64-bit int) by 1 */
+static void ctr64_inc(unsigned char *counter) {
+ u32 n=8;
+ u8 c;
+
+ do {
+ --n;
+ c = counter[n];
+ ++c;
+ counter[n] = c;
+ if (c) return;
+ } while (n);
+}
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+static void
+ctr64_inc_aligned(unsigned char *counter)
+{
+#if BYTE_ORDER == LITTLE_ENDIAN
+ ctr64_inc(counter);
+#else
+ size_t *data, c, n;
+ data = (size_t *)counter;
+ n = 8 / sizeof(size_t);
+ do {
+ --n;
+ c = data[n];
+ ++c;
+ data[n] = c;
+ if (c)
+ return;
+ } while (n);
+#endif
+}
+#endif
+
+/* The input encrypted as though 64bit counter mode is being
+ * used. The extra state information to record how much of the
+ * 64bit 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_ctr64_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_ctr64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], unsigned char ecount_buf[8],
+ unsigned int *num, block64_f block)
+{
+ unsigned int n;
+ size_t l=0;
+
+ assert(*num < 8);
+
+ n = *num;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+ if (8%sizeof(size_t) == 0) do { /* always true actually */
+ while (n && len) {
+ *(out++) = *(in++) ^ ecount_buf[n];
+ --len;
+ n = (n+1) % 8;
+ }
+
+#ifdef __STRICT_ALIGNMENT
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+ break;
+#endif
+ while (len>=8) {
+ (*block)(ivec, ecount_buf, key);
+ ctr64_inc_aligned(ivec);
+ for (; n<8; n+=sizeof(size_t))
+ *(size_t *)(out+n) =
+ *(size_t *)(in+n) ^ *(size_t *)(ecount_buf+n);
+ len -= 8;
+ out += 8;
+ in += 8;
+ n = 0;
+ }
+ if (len) {
+ (*block)(ivec, ecount_buf, key);
+ ctr64_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);
+ ctr64_inc(ivec);
+ }
+ out[l] = in[l] ^ ecount_buf[n];
+ ++l;
+ n = (n+1) % 8;
+ }
+
+ *num=n;
+}
diff --git a/src/lib/libcrypto/modes/modes.h b/src/lib/libcrypto/modes/modes.h
index 67ec7518d..2344e944e 100644
--- a/src/lib/libcrypto/modes/modes.h
+++ b/src/lib/libcrypto/modes/modes.h
@@ -139,6 +139,32 @@ typedef struct xts128_context XTS128_CONTEXT;
int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],
const unsigned char *inp, unsigned char *out, size_t len, int enc);
+typedef void (*block64_f)(const unsigned char in[8],
+ unsigned char out[8],
+ const void *key);
+
+void CRYPTO_cbc64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], block64_f block);
+void CRYPTO_cbc64_decrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], block64_f block);
+
+void CRYPTO_ctr64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], unsigned char ecount_buf[8],
+ unsigned int *num, block64_f block);
+
+void CRYPTO_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], int *num,
+ block64_f block);
+
+void CRYPTO_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], int *num,
+ int enc, block64_f block);
+
#ifdef __cplusplus
}
#endif
diff --git a/src/lib/libcrypto/modes/ofb64.c b/src/lib/libcrypto/modes/ofb64.c
new file mode 100644
index 000000000..8368811ce
--- /dev/null
+++ b/src/lib/libcrypto/modes/ofb64.c
@@ -0,0 +1,119 @@
+/* $OpenBSD: ofb64.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
+/* ====================================================================
+ * 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 <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+# define NDEBUG
+# endif
+#endif
+
+/* The input and output encrypted as though 64bit ofb mode is being
+ * used. The extra state information to record how much of the
+ * 64bit block we have used is contained in *num;
+ */
+void CRYPTO_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[8], int *num,
+ block64_f block)
+{
+ unsigned int n;
+ size_t l=0;
+
+ n = *num;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+ if (8%sizeof(size_t) == 0) do { /* always true actually */
+ while (n && len) {
+ *(out++) = *(in++) ^ ivec[n];
+ --len;
+ n = (n+1) % 8;
+ }
+#ifdef __STRICT_ALIGNMENT
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+ break;
+#endif
+ while (len>=8) {
+ (*block)(ivec, ivec, key);
+ for (; n<8; n+=sizeof(size_t))
+ *(size_t*)(out+n) =
+ *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
+ len -= 8;
+ out += 8;
+ in += 8;
+ 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) % 8;
+ }
+
+ *num=n;
+}
--
2.17.1
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