From 0f708daf2d14dcca261ef98cc698a1b1f2a6aa74 Mon Sep 17 00:00:00 2001 From: Wim Date: Thu, 9 Jan 2020 21:02:56 +0100 Subject: Update dependencies (#975) --- vendor/golang.org/x/crypto/poly1305/bits_compat.go | 39 ++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 vendor/golang.org/x/crypto/poly1305/bits_compat.go (limited to 'vendor/golang.org/x/crypto/poly1305/bits_compat.go') diff --git a/vendor/golang.org/x/crypto/poly1305/bits_compat.go b/vendor/golang.org/x/crypto/poly1305/bits_compat.go new file mode 100644 index 00000000..157a69f6 --- /dev/null +++ b/vendor/golang.org/x/crypto/poly1305/bits_compat.go @@ -0,0 +1,39 @@ +// Copyright 2019 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. + +// +build !go1.13 + +package poly1305 + +// Generic fallbacks for the math/bits intrinsics, copied from +// src/math/bits/bits.go. They were added in Go 1.12, but Add64 and Sum64 had +// variable time fallbacks until Go 1.13. + +func bitsAdd64(x, y, carry uint64) (sum, carryOut uint64) { + sum = x + y + carry + carryOut = ((x & y) | ((x | y) &^ sum)) >> 63 + return +} + +func bitsSub64(x, y, borrow uint64) (diff, borrowOut uint64) { + diff = x - y - borrow + borrowOut = ((^x & y) | (^(x ^ y) & diff)) >> 63 + return +} + +func bitsMul64(x, y uint64) (hi, lo uint64) { + const mask32 = 1<<32 - 1 + x0 := x & mask32 + x1 := x >> 32 + y0 := y & mask32 + y1 := y >> 32 + w0 := x0 * y0 + t := x1*y0 + w0>>32 + w1 := t & mask32 + w2 := t >> 32 + w1 += x0 * y1 + hi = x1*y1 + w2 + w1>>32 + lo = x * y + return +} -- cgit v1.2.3