From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:19:13 +0200 Subject: Adding upstream version 1.21.8. Signed-off-by: Daniel Baumann --- src/crypto/subtle/constant_time.go | 62 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 src/crypto/subtle/constant_time.go (limited to 'src/crypto/subtle/constant_time.go') diff --git a/src/crypto/subtle/constant_time.go b/src/crypto/subtle/constant_time.go new file mode 100644 index 0000000..4e0527f --- /dev/null +++ b/src/crypto/subtle/constant_time.go @@ -0,0 +1,62 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package subtle implements functions that are often useful in cryptographic +// code but require careful thought to use correctly. +package subtle + +// ConstantTimeCompare returns 1 if the two slices, x and y, have equal contents +// and 0 otherwise. The time taken is a function of the length of the slices and +// is independent of the contents. If the lengths of x and y do not match it +// returns 0 immediately. +func ConstantTimeCompare(x, y []byte) int { + if len(x) != len(y) { + return 0 + } + + var v byte + + for i := 0; i < len(x); i++ { + v |= x[i] ^ y[i] + } + + return ConstantTimeByteEq(v, 0) +} + +// ConstantTimeSelect returns x if v == 1 and y if v == 0. +// Its behavior is undefined if v takes any other value. +func ConstantTimeSelect(v, x, y int) int { return ^(v-1)&x | (v-1)&y } + +// ConstantTimeByteEq returns 1 if x == y and 0 otherwise. +func ConstantTimeByteEq(x, y uint8) int { + return int((uint32(x^y) - 1) >> 31) +} + +// ConstantTimeEq returns 1 if x == y and 0 otherwise. +func ConstantTimeEq(x, y int32) int { + return int((uint64(uint32(x^y)) - 1) >> 63) +} + +// ConstantTimeCopy copies the contents of y into x (a slice of equal length) +// if v == 1. If v == 0, x is left unchanged. Its behavior is undefined if v +// takes any other value. +func ConstantTimeCopy(v int, x, y []byte) { + if len(x) != len(y) { + panic("subtle: slices have different lengths") + } + + xmask := byte(v - 1) + ymask := byte(^(v - 1)) + for i := 0; i < len(x); i++ { + x[i] = x[i]&xmask | y[i]&ymask + } +} + +// ConstantTimeLessOrEq returns 1 if x <= y and 0 otherwise. +// Its behavior is undefined if x or y are negative or > 2**31 - 1. +func ConstantTimeLessOrEq(x, y int) int { + x32 := int32(x) + y32 := int32(y) + return int(((x32 - y32 - 1) >> 31) & 1) +} -- cgit v1.2.3