2016-05-17 18:24:17 +00:00
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/*
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2019-09-10 12:56:40 +00:00
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* Copyright 2014-2019 The OpenSSL Project Authors. All Rights Reserved.
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2014-08-28 13:33:34 +00:00
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*
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2016-05-17 18:24:17 +00:00
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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2014-08-28 13:33:34 +00:00
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*/
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2019-09-27 21:58:12 +00:00
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#ifndef OSSL_INTERNAL_CONSTANT_TIME_H
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# define OSSL_INTERNAL_CONSTANT_TIME_H
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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# include <stdlib.h>
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2018-02-01 13:51:53 +00:00
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# include <string.h>
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2015-12-22 16:07:24 +00:00
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# include <openssl/e_os2.h> /* For 'ossl_inline' */
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2014-08-28 13:33:34 +00:00
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2014-12-28 02:48:40 +00:00
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/*-
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2014-08-28 17:43:49 +00:00
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* The boolean methods return a bitmask of all ones (0xff...f) for true
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2014-08-28 13:33:34 +00:00
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* and 0 for false. This is useful for choosing a value based on the result
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* of a conditional in constant time. For example,
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2017-06-20 19:21:21 +00:00
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* if (a < b) {
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* c = a;
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* } else {
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* c = b;
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* }
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2014-08-28 13:33:34 +00:00
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* can be written as
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2017-06-20 19:21:21 +00:00
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* unsigned int lt = constant_time_lt(a, b);
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* c = constant_time_select(lt, a, b);
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2014-08-28 13:33:34 +00:00
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*/
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2017-12-23 22:32:11 +00:00
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/* Returns the given value with the MSB copied to all the other bits. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_msb(unsigned int a);
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2018-02-01 13:51:53 +00:00
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/* Convenience method for uint32_t. */
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static ossl_inline uint32_t constant_time_msb_32(uint32_t a);
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2017-06-20 19:21:21 +00:00
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/* Convenience method for uint64_t. */
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static ossl_inline uint64_t constant_time_msb_64(uint64_t a);
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2014-08-28 13:33:34 +00:00
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2017-06-20 19:21:21 +00:00
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/* Returns 0xff..f if a < b and 0 otherwise. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_lt(unsigned int a,
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unsigned int b);
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2014-08-28 13:33:34 +00:00
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/* Convenience method for getting an 8-bit mask. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_lt_8(unsigned int a,
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unsigned int b);
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2017-06-20 19:21:21 +00:00
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/* Convenience method for uint64_t. */
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static ossl_inline uint64_t constant_time_lt_64(uint64_t a, uint64_t b);
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2014-08-28 13:33:34 +00:00
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2017-06-20 19:21:21 +00:00
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/* Returns 0xff..f if a >= b and 0 otherwise. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_ge(unsigned int a,
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unsigned int b);
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2014-08-28 13:33:34 +00:00
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/* Convenience method for getting an 8-bit mask. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_ge_8(unsigned int a,
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unsigned int b);
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2014-08-28 13:33:34 +00:00
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2017-06-20 19:21:21 +00:00
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/* Returns 0xff..f if a == 0 and 0 otherwise. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_is_zero(unsigned int a);
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2014-08-28 13:33:34 +00:00
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/* Convenience method for getting an 8-bit mask. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_is_zero_8(unsigned int a);
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2018-02-01 13:51:53 +00:00
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/* Convenience method for getting a 32-bit mask. */
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static ossl_inline uint32_t constant_time_is_zero_32(uint32_t a);
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2014-08-28 13:33:34 +00:00
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2017-06-20 19:21:21 +00:00
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/* Returns 0xff..f if a == b and 0 otherwise. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_eq(unsigned int a,
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unsigned int b);
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2014-08-28 13:33:34 +00:00
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/* Convenience method for getting an 8-bit mask. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_eq_8(unsigned int a,
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unsigned int b);
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2014-09-04 11:04:42 +00:00
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/* Signed integers. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_eq_int(int a, int b);
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2014-09-04 11:04:42 +00:00
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/* Convenience method for getting an 8-bit mask. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_eq_int_8(int a, int b);
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2014-09-04 11:04:42 +00:00
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2014-12-28 02:48:40 +00:00
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/*-
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2014-08-28 17:43:49 +00:00
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* Returns (mask & a) | (~mask & b).
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*
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* When |mask| is all 1s or all 0s (as returned by the methods above),
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* the select methods return either |a| (if |mask| is nonzero) or |b|
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* (if |mask| is zero).
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*/
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_select(unsigned int mask,
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unsigned int a,
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unsigned int b);
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2014-08-28 17:43:49 +00:00
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/* Convenience method for unsigned chars. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_select_8(unsigned char mask,
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unsigned char a,
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unsigned char b);
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2018-02-01 13:51:53 +00:00
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/* Convenience method for uint32_t. */
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static ossl_inline uint32_t constant_time_select_32(uint32_t mask, uint32_t a,
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uint32_t b);
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2017-06-20 19:21:21 +00:00
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/* Convenience method for uint64_t. */
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static ossl_inline uint64_t constant_time_select_64(uint64_t mask, uint64_t a,
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uint64_t b);
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2014-08-28 17:43:49 +00:00
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/* Convenience method for signed integers. */
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2015-12-22 16:07:24 +00:00
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static ossl_inline int constant_time_select_int(unsigned int mask, int a,
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int b);
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2014-08-28 17:43:49 +00:00
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2017-06-20 19:21:21 +00:00
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_msb(unsigned int a)
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2015-01-22 03:40:55 +00:00
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{
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return 0 - (a >> (sizeof(a) * 8 - 1));
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}
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2014-08-28 13:33:34 +00:00
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2018-02-01 13:51:53 +00:00
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static ossl_inline uint32_t constant_time_msb_32(uint32_t a)
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{
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return 0 - (a >> 31);
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}
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2017-06-20 19:21:21 +00:00
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static ossl_inline uint64_t constant_time_msb_64(uint64_t a)
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{
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return 0 - (a >> 63);
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}
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2016-10-19 16:13:13 +00:00
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static ossl_inline size_t constant_time_msb_s(size_t a)
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{
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return 0 - (a >> (sizeof(a) * 8 - 1));
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_lt(unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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return constant_time_msb(a ^ ((a ^ b) | ((a - b) ^ b)));
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}
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline size_t constant_time_lt_s(size_t a, size_t b)
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{
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return constant_time_msb_s(a ^ ((a ^ b) | ((a - b) ^ b)));
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_lt_8(unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_lt(a, b);
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2015-01-22 03:40:55 +00:00
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}
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2014-08-28 13:33:34 +00:00
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2017-06-20 19:21:21 +00:00
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static ossl_inline uint64_t constant_time_lt_64(uint64_t a, uint64_t b)
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{
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return constant_time_msb_64(a ^ ((a ^ b) | ((a - b) ^ b)));
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_ge(unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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return ~constant_time_lt(a, b);
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}
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline size_t constant_time_ge_s(size_t a, size_t b)
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{
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return ~constant_time_lt_s(a, b);
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_ge_8(unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_ge(a, b);
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2015-01-22 03:40:55 +00:00
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}
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline unsigned char constant_time_ge_8_s(size_t a, size_t b)
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{
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2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_ge_s(a, b);
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2016-10-19 16:13:13 +00:00
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_is_zero(unsigned int a)
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2015-01-22 03:40:55 +00:00
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{
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return constant_time_msb(~a & (a - 1));
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}
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline size_t constant_time_is_zero_s(size_t a)
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{
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return constant_time_msb_s(~a & (a - 1));
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_is_zero_8(unsigned int a)
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2015-01-22 03:40:55 +00:00
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{
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2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_is_zero(a);
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2015-01-22 03:40:55 +00:00
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}
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2014-08-28 13:33:34 +00:00
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2018-02-01 13:51:53 +00:00
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static ossl_inline uint32_t constant_time_is_zero_32(uint32_t a)
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{
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return constant_time_msb_32(~a & (a - 1));
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_eq(unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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return constant_time_is_zero(a ^ b);
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}
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline size_t constant_time_eq_s(size_t a, size_t b)
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{
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return constant_time_is_zero_s(a ^ b);
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_eq_8(unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_eq(a, b);
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2015-01-22 03:40:55 +00:00
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}
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2014-08-28 13:33:34 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline unsigned char constant_time_eq_8_s(size_t a, size_t b)
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{
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2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_eq_s(a, b);
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2016-10-19 16:13:13 +00:00
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_eq_int(int a, int b)
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2015-01-22 03:40:55 +00:00
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{
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return constant_time_eq((unsigned)(a), (unsigned)(b));
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}
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2014-09-04 11:04:42 +00:00
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_eq_int_8(int a, int b)
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2015-01-22 03:40:55 +00:00
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{
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return constant_time_eq_8((unsigned)(a), (unsigned)(b));
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}
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2014-09-04 11:04:42 +00:00
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2019-06-21 19:26:19 +00:00
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/*
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* Returns the value unmodified, but avoids optimizations.
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* The barriers prevent the compiler from narrowing down the
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* possible value range of the mask and ~mask in the select
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* statements, which avoids the recognition of the select
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* and turning it into a conditional load or branch.
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*/
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static ossl_inline unsigned int value_barrier(unsigned int a)
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{
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#if !defined(OPENSSL_NO_ASM) && defined(__GNUC__)
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unsigned int r;
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__asm__("" : "=r"(r) : "0"(a));
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#else
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volatile unsigned int r = a;
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#endif
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return r;
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}
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/* Convenience method for uint32_t. */
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static ossl_inline uint32_t value_barrier_32(uint32_t a)
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{
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#if !defined(OPENSSL_NO_ASM) && defined(__GNUC__)
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uint32_t r;
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__asm__("" : "=r"(r) : "0"(a));
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#else
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volatile uint32_t r = a;
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#endif
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return r;
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}
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/* Convenience method for uint64_t. */
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static ossl_inline uint64_t value_barrier_64(uint64_t a)
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{
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#if !defined(OPENSSL_NO_ASM) && defined(__GNUC__)
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uint64_t r;
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__asm__("" : "=r"(r) : "0"(a));
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#else
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volatile uint64_t r = a;
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#endif
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return r;
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}
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/* Convenience method for size_t. */
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static ossl_inline size_t value_barrier_s(size_t a)
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{
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#if !defined(OPENSSL_NO_ASM) && defined(__GNUC__)
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size_t r;
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__asm__("" : "=r"(r) : "0"(a));
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#else
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volatile size_t r = a;
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#endif
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return r;
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned int constant_time_select(unsigned int mask,
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unsigned int a,
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unsigned int b)
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2015-01-22 03:40:55 +00:00
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{
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2019-06-21 19:26:19 +00:00
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return (value_barrier(mask) & a) | (value_barrier(~mask) & b);
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2015-01-22 03:40:55 +00:00
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}
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2014-08-28 17:43:49 +00:00
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2016-10-19 16:13:13 +00:00
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static ossl_inline size_t constant_time_select_s(size_t mask,
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size_t a,
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|
size_t b)
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{
|
2019-06-21 19:26:19 +00:00
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return (value_barrier_s(mask) & a) | (value_barrier_s(~mask) & b);
|
2016-10-19 16:13:13 +00:00
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}
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2015-12-22 16:07:24 +00:00
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static ossl_inline unsigned char constant_time_select_8(unsigned char mask,
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unsigned char a,
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unsigned char b)
|
2015-01-22 03:40:55 +00:00
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{
|
2017-10-17 14:04:09 +00:00
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return (unsigned char)constant_time_select(mask, a, b);
|
2015-01-22 03:40:55 +00:00
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}
|
2014-08-28 17:43:49 +00:00
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2015-12-22 16:07:24 +00:00
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static ossl_inline int constant_time_select_int(unsigned int mask, int a,
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int b)
|
2015-01-22 03:40:55 +00:00
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{
|
2017-10-17 14:04:09 +00:00
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return (int)constant_time_select(mask, (unsigned)(a), (unsigned)(b));
|
2015-01-22 03:40:55 +00:00
|
|
|
}
|
2014-08-28 17:43:49 +00:00
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2016-10-19 16:13:13 +00:00
|
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static ossl_inline int constant_time_select_int_s(size_t mask, int a, int b)
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{
|
2017-10-17 14:04:09 +00:00
|
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return (int)constant_time_select((unsigned)mask, (unsigned)(a),
|
|
|
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(unsigned)(b));
|
2016-10-19 16:13:13 +00:00
|
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}
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|
2018-02-01 13:51:53 +00:00
|
|
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static ossl_inline uint32_t constant_time_select_32(uint32_t mask, uint32_t a,
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|
|
uint32_t b)
|
|
|
|
{
|
2019-06-21 19:26:19 +00:00
|
|
|
return (value_barrier_32(mask) & a) | (value_barrier_32(~mask) & b);
|
2018-02-01 13:51:53 +00:00
|
|
|
}
|
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|
2017-06-20 19:21:21 +00:00
|
|
|
static ossl_inline uint64_t constant_time_select_64(uint64_t mask, uint64_t a,
|
|
|
|
uint64_t b)
|
|
|
|
{
|
2019-06-21 19:26:19 +00:00
|
|
|
return (value_barrier_64(mask) & a) | (value_barrier_64(~mask) & b);
|
2017-06-20 19:21:21 +00:00
|
|
|
}
|
|
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|
2018-02-01 13:51:53 +00:00
|
|
|
/*
|
|
|
|
* mask must be 0xFFFFFFFF or 0x00000000.
|
|
|
|
*
|
|
|
|
* if (mask) {
|
|
|
|
* uint32_t tmp = *a;
|
|
|
|
*
|
|
|
|
* *a = *b;
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|
|
|
* *b = tmp;
|
|
|
|
* }
|
|
|
|
*/
|
|
|
|
static ossl_inline void constant_time_cond_swap_32(uint32_t mask, uint32_t *a,
|
|
|
|
uint32_t *b)
|
|
|
|
{
|
|
|
|
uint32_t xor = *a ^ *b;
|
|
|
|
|
|
|
|
xor &= mask;
|
|
|
|
*a ^= xor;
|
|
|
|
*b ^= xor;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* mask must be 0xFFFFFFFF or 0x00000000.
|
|
|
|
*
|
|
|
|
* if (mask) {
|
|
|
|
* uint64_t tmp = *a;
|
|
|
|
*
|
|
|
|
* *a = *b;
|
|
|
|
* *b = tmp;
|
|
|
|
* }
|
|
|
|
*/
|
|
|
|
static ossl_inline void constant_time_cond_swap_64(uint64_t mask, uint64_t *a,
|
|
|
|
uint64_t *b)
|
|
|
|
{
|
|
|
|
uint64_t xor = *a ^ *b;
|
|
|
|
|
|
|
|
xor &= mask;
|
|
|
|
*a ^= xor;
|
|
|
|
*b ^= xor;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* table is a two dimensional array of bytes. Each row has rowsize elements.
|
|
|
|
* Copies row number idx into out. rowsize and numrows are not considered
|
|
|
|
* private.
|
|
|
|
*/
|
|
|
|
static ossl_inline void constant_time_lookup(void *out,
|
|
|
|
const void *table,
|
|
|
|
size_t rowsize,
|
|
|
|
size_t numrows,
|
|
|
|
size_t idx)
|
|
|
|
{
|
|
|
|
size_t i, j;
|
|
|
|
const unsigned char *tablec = (const unsigned char *)table;
|
|
|
|
unsigned char *outc = (unsigned char *)out;
|
|
|
|
unsigned char mask;
|
|
|
|
|
|
|
|
memset(out, 0, rowsize);
|
|
|
|
|
|
|
|
/* Note idx may underflow - but that is well defined */
|
|
|
|
for (i = 0; i < numrows; i++, idx--) {
|
|
|
|
mask = (unsigned char)constant_time_is_zero_s(idx);
|
|
|
|
for (j = 0; j < rowsize; j++)
|
|
|
|
*(outc + j) |= constant_time_select_8(mask, *(tablec++), 0);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-09-01 10:19:30 +00:00
|
|
|
/*
|
|
|
|
* Expected usage pattern is to unconditionally set error and then
|
|
|
|
* wipe it if there was no actual error. |clear| is 1 or 0.
|
|
|
|
*/
|
|
|
|
void err_clear_last_constant_time(int clear);
|
|
|
|
|
2019-09-27 21:58:12 +00:00
|
|
|
#endif /* OSSL_INTERNAL_CONSTANT_TIME_H */
|