crypto

Documentation

Index

• Constants
• func Signature(value uint32) []byte
• func SignatureToUint32(sig []byte) uint32
• type MAC
  • func New(key []byte) (*MAC, error)
  • func (m *MAC) Decrypt(dst, src []byte) ([]byte, error)
  • func (m *MAC) Encrypt(dst, src []byte) []byte
  • func (m *MAC) Overhead() int

Constants

const (
	// EpochSize length of epoch
	EpochSize = 4
	// MessageOffset offset for the message without overhead
	MessageOffset = EpochSize + 4
)

Functions

func Signature

func Signature(value uint32) []byte

Signature signature is used in the message encryption to validate signature of the message signature is added to the destination slice

func SignatureToUint32

func SignatureToUint32(sig []byte) uint32

SignatureToUint32 returns uint32 for signature

Types

type MAC

type MAC struct {
	// contains filtered or unexported fields
}

MAC has the ability to encrypt and decrypt (short) messages as long as they share the same key and the same epoch.

func New

func New(key []byte) (*MAC, error)

New builds a new MAC using a 256-bit/32 byte encryption key, a numeric epoch and numeric pseudo-random salt

func (*MAC) Decrypt

func (m *MAC) Decrypt(dst, src []byte) ([]byte, error)

Decrypt decrypts src and appends to dst, returning the resulting byte slice or an error if the input cannot be authenticated.

func (*MAC) Encrypt

func (m *MAC) Encrypt(dst, src []byte) []byte

Encrypt encrypts src and appends to dst, returning the resulting byte slice

func (*MAC) Overhead

func (m *MAC) Overhead() int

Overhead returns the maximum difference between the lengths of a plaintext and its ciphertext.