From b6f94dbeacfc6f0a507413096189304c58dbe66c Mon Sep 17 00:00:00 2001 From: Mathieu Trudel-Lapierre Date: Wed, 13 Sep 2017 12:09:40 -0700 Subject: New upstream version 13~git1505328970.9c1c35c5 --- Cryptlib/Include/internal/constant_time_locl.h | 185 ------------------------- 1 file changed, 185 deletions(-) delete mode 100644 Cryptlib/Include/internal/constant_time_locl.h (limited to 'Cryptlib/Include/internal/constant_time_locl.h') diff --git a/Cryptlib/Include/internal/constant_time_locl.h b/Cryptlib/Include/internal/constant_time_locl.h deleted file mode 100644 index d27fb14c..00000000 --- a/Cryptlib/Include/internal/constant_time_locl.h +++ /dev/null @@ -1,185 +0,0 @@ -/* - * Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved. - * - * Licensed under the OpenSSL license (the "License"). You may not use - * this file except in compliance with the License. You can obtain a copy - * in the file LICENSE in the source distribution or at - * https://www.openssl.org/source/license.html - */ - -#ifndef HEADER_CONSTANT_TIME_LOCL_H -# define HEADER_CONSTANT_TIME_LOCL_H - -# include /* For 'ossl_inline' */ - -#ifdef __cplusplus -extern "C" { -#endif - -/*- - * The boolean methods return a bitmask of all ones (0xff...f) for true - * and 0 for false. This is useful for choosing a value based on the result - * of a conditional in constant time. For example, - * - * if (a < b) { - * c = a; - * } else { - * c = b; - * } - * - * can be written as - * - * unsigned int lt = constant_time_lt(a, b); - * c = constant_time_select(lt, a, b); - */ - -/* - * Returns the given value with the MSB copied to all the other - * bits. Uses the fact that arithmetic shift shifts-in the sign bit. - * However, this is not ensured by the C standard so you may need to - * replace this with something else on odd CPUs. - */ -static ossl_inline unsigned int constant_time_msb(unsigned int a); - -/* - * Returns 0xff..f if a < b and 0 otherwise. - */ -static ossl_inline unsigned int constant_time_lt(unsigned int a, - unsigned int b); -/* Convenience method for getting an 8-bit mask. */ -static ossl_inline unsigned char constant_time_lt_8(unsigned int a, - unsigned int b); - -/* - * Returns 0xff..f if a >= b and 0 otherwise. - */ -static ossl_inline unsigned int constant_time_ge(unsigned int a, - unsigned int b); -/* Convenience method for getting an 8-bit mask. */ -static ossl_inline unsigned char constant_time_ge_8(unsigned int a, - unsigned int b); - -/* - * Returns 0xff..f if a == 0 and 0 otherwise. - */ -static ossl_inline unsigned int constant_time_is_zero(unsigned int a); -/* Convenience method for getting an 8-bit mask. */ -static ossl_inline unsigned char constant_time_is_zero_8(unsigned int a); - -/* - * Returns 0xff..f if a == b and 0 otherwise. - */ -static ossl_inline unsigned int constant_time_eq(unsigned int a, - unsigned int b); -/* Convenience method for getting an 8-bit mask. */ -static ossl_inline unsigned char constant_time_eq_8(unsigned int a, - unsigned int b); -/* Signed integers. */ -static ossl_inline unsigned int constant_time_eq_int(int a, int b); -/* Convenience method for getting an 8-bit mask. */ -static ossl_inline unsigned char constant_time_eq_int_8(int a, int b); - -/*- - * Returns (mask & a) | (~mask & b). - * - * When |mask| is all 1s or all 0s (as returned by the methods above), - * the select methods return either |a| (if |mask| is nonzero) or |b| - * (if |mask| is zero). - */ -static ossl_inline unsigned int constant_time_select(unsigned int mask, - unsigned int a, - unsigned int b); -/* Convenience method for unsigned chars. */ -static ossl_inline unsigned char constant_time_select_8(unsigned char mask, - unsigned char a, - unsigned char b); -/* Convenience method for signed integers. */ -static ossl_inline int constant_time_select_int(unsigned int mask, int a, - int b); - -static ossl_inline unsigned int constant_time_msb(unsigned int a) -{ - return 0 - (a >> (sizeof(a) * 8 - 1)); -} - -static ossl_inline unsigned int constant_time_lt(unsigned int a, - unsigned int b) -{ - return constant_time_msb(a ^ ((a ^ b) | ((a - b) ^ b))); -} - -static ossl_inline unsigned char constant_time_lt_8(unsigned int a, - unsigned int b) -{ - return (unsigned char)(constant_time_lt(a, b)); -} - -static ossl_inline unsigned int constant_time_ge(unsigned int a, - unsigned int b) -{ - return ~constant_time_lt(a, b); -} - -static ossl_inline unsigned char constant_time_ge_8(unsigned int a, - unsigned int b) -{ - return (unsigned char)(constant_time_ge(a, b)); -} - -static ossl_inline unsigned int constant_time_is_zero(unsigned int a) -{ - return constant_time_msb(~a & (a - 1)); -} - -static ossl_inline unsigned char constant_time_is_zero_8(unsigned int a) -{ - return (unsigned char)(constant_time_is_zero(a)); -} - -static ossl_inline unsigned int constant_time_eq(unsigned int a, - unsigned int b) -{ - return constant_time_is_zero(a ^ b); -} - -static ossl_inline unsigned char constant_time_eq_8(unsigned int a, - unsigned int b) -{ - return (unsigned char)(constant_time_eq(a, b)); -} - -static ossl_inline unsigned int constant_time_eq_int(int a, int b) -{ - return constant_time_eq((unsigned)(a), (unsigned)(b)); -} - -static ossl_inline unsigned char constant_time_eq_int_8(int a, int b) -{ - return constant_time_eq_8((unsigned)(a), (unsigned)(b)); -} - -static ossl_inline unsigned int constant_time_select(unsigned int mask, - unsigned int a, - unsigned int b) -{ - return (mask & a) | (~mask & b); -} - -static ossl_inline unsigned char constant_time_select_8(unsigned char mask, - unsigned char a, - unsigned char b) -{ - return (unsigned char)(constant_time_select(mask, a, b)); -} - -static ossl_inline int constant_time_select_int(unsigned int mask, int a, - int b) -{ - return (int)(constant_time_select(mask, (unsigned)(a), (unsigned)(b))); -} - -#ifdef __cplusplus -} -#endif - -#endif /* HEADER_CONSTANT_TIME_LOCL_H */ -- cgit v1.2.3