From eb8dd9dca1228af0cd132f515509051ecfabf6f6 Mon Sep 17 00:00:00 2001 From: cvs2svn Date: Mon, 14 Apr 2025 17:32:06 +0000 Subject: This commit was manufactured by cvs2git to create tag 'tb_20250414'. --- src/lib/libcrypto/constant_time.h | 207 -------------------------------------- 1 file changed, 207 deletions(-) delete mode 100644 src/lib/libcrypto/constant_time.h (limited to 'src/lib/libcrypto/constant_time.h') diff --git a/src/lib/libcrypto/constant_time.h b/src/lib/libcrypto/constant_time.h deleted file mode 100644 index ea7dede9db..0000000000 --- a/src/lib/libcrypto/constant_time.h +++ /dev/null @@ -1,207 +0,0 @@ -/* $OpenBSD: constant_time.h,v 1.3 2023/04/06 18:43:47 tb Exp $ */ -/*- - * Utilities for constant-time cryptography. - * - * Author: Emilia Kasper (emilia@openssl.org) - * Based on previous work by Bodo Moeller, Emilia Kasper, Adam Langley - * (Google). - * ==================================================================== - * Copyright (c) 2014 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 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 acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS 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 AUTHOR OR 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. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] - */ - -#ifndef HEADER_CONSTANT_TIME_H -#define HEADER_CONSTANT_TIME_H - -__BEGIN_HIDDEN_DECLS - -/*- - * 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 inline unsigned int constant_time_msb(unsigned int a); - -/* - * Returns 0xff..f if a < b and 0 otherwise. - */ -static inline unsigned int constant_time_lt(unsigned int a, unsigned int b); -/* Convenience method for getting an 8-bit mask. */ -static inline unsigned char constant_time_lt_8(unsigned int a, - unsigned int b); - -/* - * Returns 0xff..f if a >= b and 0 otherwise. - */ -static inline unsigned int constant_time_ge(unsigned int a, unsigned int b); -/* Convenience method for getting an 8-bit mask. */ -static inline unsigned char constant_time_ge_8(unsigned int a, - unsigned int b); - -/* - * Returns 0xff..f if a == 0 and 0 otherwise. - */ -static inline unsigned int constant_time_is_zero(unsigned int a); -/* Convenience method for getting an 8-bit mask. */ -static inline unsigned char constant_time_is_zero_8(unsigned int a); - -/* - * Returns 0xff..f if a == b and 0 otherwise. - */ -static inline unsigned int constant_time_eq(unsigned int a, unsigned int b); -/* Convenience method for getting an 8-bit mask. */ -static inline unsigned char constant_time_eq_8(unsigned int a, - unsigned int b); -/* Signed integers. */ -static inline unsigned int constant_time_eq_int(int a, int b); -/* Convenience method for getting an 8-bit mask. */ -static 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 inline unsigned int constant_time_select(unsigned int mask, - unsigned int a, - unsigned int b); -/* Convenience method for unsigned chars. */ -static inline unsigned char constant_time_select_8(unsigned char mask, - unsigned char a, - unsigned char b); -/* Convenience method for signed integers. */ -static inline int constant_time_select_int(unsigned int mask, int a, int b); - -static inline unsigned int constant_time_msb(unsigned int a) -{ - return 0 - (a >> (sizeof(a) * 8 - 1)); -} - -static inline unsigned int constant_time_lt(unsigned int a, unsigned int b) -{ - return constant_time_msb(a ^ ((a ^ b) | ((a - b) ^ b))); -} - -static inline unsigned char constant_time_lt_8(unsigned int a, unsigned int b) -{ - return (unsigned char)(constant_time_lt(a, b)); -} - -static inline unsigned int constant_time_ge(unsigned int a, unsigned int b) -{ - return ~constant_time_lt(a, b); -} - -static inline unsigned char constant_time_ge_8(unsigned int a, unsigned int b) -{ - return (unsigned char)(constant_time_ge(a, b)); -} - -static inline unsigned int constant_time_is_zero(unsigned int a) -{ - return constant_time_msb(~a & (a - 1)); -} - -static inline unsigned char constant_time_is_zero_8(unsigned int a) -{ - return (unsigned char)(constant_time_is_zero(a)); -} - -static inline unsigned int constant_time_eq(unsigned int a, unsigned int b) -{ - return constant_time_is_zero(a ^ b); -} - -static inline unsigned char constant_time_eq_8(unsigned int a, unsigned int b) -{ - return (unsigned char)(constant_time_eq(a, b)); -} - -static inline unsigned int constant_time_eq_int(int a, int b) -{ - return constant_time_eq((unsigned)(a), (unsigned)(b)); -} - -static inline unsigned char constant_time_eq_int_8(int a, int b) -{ - return constant_time_eq_8((unsigned)(a), (unsigned)(b)); -} - -static inline unsigned int constant_time_select(unsigned int mask, - unsigned int a, - unsigned int b) -{ - return (mask & a) | (~mask & b); -} - -static 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 inline int constant_time_select_int(unsigned int mask, int a, int b) -{ - return (int)(constant_time_select(mask, (unsigned)(a), (unsigned)(b))); -} - -void err_clear_last_constant_time(int clear); - -__END_HIDDEN_DECLS - -#endif /* !HEADER_CONSTANT_TIME_H */ -- cgit v1.2.3-55-g6feb