ed25519

Documentation

Overview

Package ed25519 implements the Ed25519 signature algorithm.

These functions are compatible with the particular validation rules around edge cases described in IOTA protocol RFC-0028. This package is a drop-in replacement for "crypto/ed25519".

Index

• Constants
• func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error)
• func Sign(privateKey PrivateKey, message []byte) []byte
• func Verify(publicKey PublicKey, message, sig []byte) bool
• type PrivateKey
  • func NewKeyFromSeed(seed []byte) PrivateKey
  • func (priv PrivateKey) Equal(x crypto.PrivateKey) bool
  • func (priv PrivateKey) Public() crypto.PublicKey
  • func (priv PrivateKey) Seed() []byte
  • func (priv PrivateKey) Sign(_ io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error)
• type PublicKey
  • func (pub PublicKey) Equal(x crypto.PublicKey) bool

Constants

const (
	// PublicKeySize is the size, in bytes, of public keys as used in this package.
	PublicKeySize = 32
	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
	PrivateKeySize = 64
	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
	SignatureSize = 64
	// SeedSize is the size, in bytes, of private key seeds. These are the private key representations used by RFC 8032.
	SeedSize = 32
)

Functions

func GenerateKey

func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error)

GenerateKey generates a public/private key pair using entropy from rand. If rand is nil, crypto/rand.Reader will be used.

func Sign

func Sign(privateKey PrivateKey, message []byte) []byte

Sign signs the message with privateKey and returns a signature. It will panic if len(privateKey) is not PrivateKeySize.

func Verify

func Verify(publicKey PublicKey, message, sig []byte) bool

Verify reports whether sig is a valid signature of message by publicKey. It uses precisely-specified validation criteria (ZIP 215) suitable for use in consensus-critical contexts.

Types

type PrivateKey

type PrivateKey []byte

PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.

func NewKeyFromSeed

func NewKeyFromSeed(seed []byte) PrivateKey

NewKeyFromSeed calculates a private key from a seed. It will panic if len(seed) is not SeedSize. This function is provided for interoperability with RFC 8032. RFC 8032's private keys correspond to seeds in this package.

func (PrivateKey) Equal

func (priv PrivateKey) Equal(x crypto.PrivateKey) bool

Equal reports whether priv and x have the same value.

func (PrivateKey) Public

func (priv PrivateKey) Public() crypto.PublicKey

Public returns the PublicKey corresponding to priv.

func (PrivateKey) Seed

func (priv PrivateKey) Seed() []byte

Seed returns the private key seed corresponding to priv. It is provided for interoperability with RFC 8032. RFC 8032's private keys correspond to seeds in this package.

func (PrivateKey) Sign

func (priv PrivateKey) Sign(_ io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error)

Sign signs the given message with priv. Ed25519 performs two passes over messages to be signed and therefore cannot handle pre-hashed messages. Thus opts.HashFunc() must return zero to indicate the message hasn't been hashed. This can be achieved by passing crypto.Hash(0) as the value for opts.

type PublicKey

type PublicKey []byte

PublicKey is the type of Ed25519 public keys.

func (PublicKey) Equal

func (pub PublicKey) Equal(x crypto.PublicKey) bool

Equal reports whether pub and x have the same value.