common

Documentation

Overview

Package common contains common implementation details of other packages, and should not be used directly.

Index

• func Msb(buf []byte) uint8
• func PadBlock(block []byte) []byte
• func ShiftLeft(b []byte) []byte
• func Xor(dst []byte, a []byte, b []byte)

Functions

func Msb

func Msb(buf []byte) uint8

Msb returns the most significant bit of the supplied data (which must be non-empty). This is the MSB(L) function of RFC 4493.

func PadBlock

func PadBlock(block []byte) []byte

PadBlock pads a string of bytes less than 16 bytes long to a full block size by appending a one bit followed by zero bits. This is the padding function used in RFCs 4493 and 5297.

func ShiftLeft

func ShiftLeft(b []byte) []byte

ShiftLeft shifts the binary string left by one bit, causing the most-signficant bit to disappear and a zero to be introduced at the right. This corresponds to the `x << 1` notation of RFC 4493.

func Xor

func Xor(dst []byte, a []byte, b []byte)

Xor computes `a XOR b`, as defined by RFC 4493. dst, a, and b must all have the same length.