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diff --git a/crypto/bn/rsaz_exp.h b/crypto/bn/rsaz_exp.h
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+/******************************************************************************
+* Copyright(c) 2012, Intel Corp.
+* Developers and authors:
+* Shay Gueron (1, 2), and Vlad Krasnov (1)
+* (1) Intel Corporation, Israel Development Center, Haifa, Israel
+* (2) University of Haifa, Israel
+******************************************************************************
+* LICENSE:
+* This submission to OpenSSL is to be made available under the OpenSSL
+* license, and only to the OpenSSL project, in order to allow integration
+* into the publicly distributed code.
+* The use of this code, or portions of this code, or concepts embedded in
+* this code, or modification of this code and/or algorithm(s) in it, or the
+* use of this code for any other purpose than stated above, requires special
+* licensing.
+******************************************************************************
+* DISCLAIMER:
+* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS AND THE COPYRIGHT OWNERS
+* ``AS IS''. 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 CONTRIBUTORS OR THE COPYRIGHT
+* OWNERS 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 RSAZ_EXP_H
+# define RSAZ_EXP_H
+
+# undef RSAZ_ENABLED
+# if defined(OPENSSL_BN_ASM_MONT) && \
+        (defined(__x86_64) || defined(__x86_64__) || \
+         defined(_M_AMD64) || defined(_M_X64))
+#  define RSAZ_ENABLED
+
+#  include <openssl/bn.h>
+
+void RSAZ_1024_mod_exp_avx2(BN_ULONG result[16],
+                            const BN_ULONG base_norm[16],
+                            const BN_ULONG exponent[16],
+                            const BN_ULONG m_norm[16], const BN_ULONG RR[16],
+                            BN_ULONG k0);
+int rsaz_avx2_eligible();
+
+void RSAZ_512_mod_exp(BN_ULONG result[8],
+                      const BN_ULONG base_norm[8], const BN_ULONG exponent[8],
+                      const BN_ULONG m_norm[8], BN_ULONG k0,
+                      const BN_ULONG RR[8]);
+
+# endif
+
+#endif