Package ed25519 implements the Ed25519 signature algorithm. See https://ed25519.cr.yp.to/.
These functions are also compatible with the “Ed25519” function defined in RFC 8032. However, unlike RFC 8032's formulation, this package's private key representation includes a public key suffix to make multiple signing operations with the same key more efficient. This package refers to the RFC 8032 private key as the “seed”.
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 )
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(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(publicKey PublicKey, message, sig byte) bool
Verify reports whether sig is a valid signature of message by publicKey. It will panic if len(publicKey) is not PublicKeySize.
PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
type PrivateKey byte
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 (priv PrivateKey) Equal(x crypto.PrivateKey) bool
Equal reports whether priv and x have the same value.
func (priv PrivateKey) Public() crypto.PublicKey
Public returns the PublicKey corresponding to priv.
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 (priv PrivateKey) Sign(rand 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.
PublicKey is the type of Ed25519 public keys.
type PublicKey byte
func (pub PublicKey) Equal(x crypto.PublicKey) bool
Equal reports whether pub and x have the same value.