golang aliasing_appengine 代码
文件路径：/src/crypto/internal/subtle/aliasing_appengine.go
/ Copyright 2018 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.
/go:build appengine
/ Package subtle implements functions that are often useful in cryptographic
/ code but require careful thought to use correctly.
/
/ This is a mirror of golang.org/x/crypto/internal/subtle.
package subtle / import "crypto/internal/subtle"
/ This is the Google App Engine standard variant based on reflect
/ because the unsafe package and cgo are disallowed.
import "reflect"
/ AnyOverlap reports whether x and y share memory at any (not necessarily
/ corresponding) index. The memory beyond the slice length is ignored.
func AnyOverlap(x, y []byte) bool {
return len(x) > 0 && len(y) > 0 &&
reflect.ValueOf(&x[0]).Pointer() <= reflect.ValueOf(&y[len(y)-1]).Pointer() &&
reflect.ValueOf(&y[0]).Pointer() <= reflect.ValueOf(&x[len(x)-1]).Pointer()
}
/ InexactOverlap reports whether x and y share memory at any non-corresponding
/ index. The memory beyond the slice length is ignored. Note that x and y can
/ have different lengths and still not have any inexact overlap.
/
/ InexactOverlap can be used to implement the requirements of the crypto/cipher
/ AEAD, Block, BlockMode and Stream interfaces.
func InexactOverlap(x, y []byte) bool {
if len(x) == 0 || len(y) == 0 || &x[0] == &y[0] {
return false
}
return AnyOverlap(x, y)
}