subtle

package standard library
go1.22.5 Latest Latest
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Published: Jul 2, 2024 License: BSD-3-Clause Imports: 0 Imported by: 19,830

Documentation

Overview

Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func ConstantTimeByteEq

func ConstantTimeByteEq(x, y uint8) int

ConstantTimeByteEq returns 1 if x == y and 0 otherwise.

func ConstantTimeCompare

func ConstantTimeCompare(x, y []byte) int

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 ConstantTimeCopy

func ConstantTimeCopy(v int, x, y []byte)

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 ConstantTimeEq

func ConstantTimeEq(x, y int32) int

ConstantTimeEq returns 1 if x == y and 0 otherwise.

func ConstantTimeLessOrEq added in go1.2

func ConstantTimeLessOrEq(x, y int) int

ConstantTimeLessOrEq returns 1 if x <= y and 0 otherwise. Its behavior is undefined if x or y are negative or > 2**31 - 1.

func ConstantTimeSelect

func ConstantTimeSelect(v, x, y int) int

ConstantTimeSelect returns x if v == 1 and y if v == 0. Its behavior is undefined if v takes any other value.

func XORBytes added in go1.20

func XORBytes(dst, x, y []byte) int

XORBytes sets dst[i] = x[i] ^ y[i] for all i < n = min(len(x), len(y)), returning n, the number of bytes written to dst. If dst does not have length at least n, XORBytes panics without writing anything to dst.

Types

This section is empty.

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