package standard library
Version: go1.5 Latest Latest

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Published: Aug 19, 2015 License: BSD-3-Clause Imports: 8 Imported by: 26,684



Package ecdsa implements the Elliptic Curve Digital Signature Algorithm, as defined in FIPS 186-3.

This implementation derives the nonce from an AES-CTR CSPRNG keyed by ChopMD(256, SHA2-512(priv.D || entropy || hash)). The CSPRNG key is IRO by a result of Coron; the AES-CTR stream is IRO under standard assumptions.



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func Sign

func Sign(rand io.Reader, priv *PrivateKey, hash []byte) (r, s *big.Int, err error)

Sign signs an arbitrary length hash (which should be the result of hashing a larger message) using the private key, priv. It returns the signature as a pair of integers. The security of the private key depends on the entropy of rand.

func Verify

func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool

Verify verifies the signature in r, s of hash using the public key, pub. Its return value records whether the signature is valid.


type PrivateKey

type PrivateKey struct {
	D *big.Int

PrivateKey represents a ECDSA private key.

func GenerateKey

func GenerateKey(c elliptic.Curve, rand io.Reader) (priv *PrivateKey, err error)

GenerateKey generates a public and private key pair.

func (*PrivateKey) Public added in go1.4

func (priv *PrivateKey) Public() crypto.PublicKey

Public returns the public key corresponding to priv.

func (*PrivateKey) Sign added in go1.4

func (priv *PrivateKey) Sign(rand io.Reader, msg []byte, opts crypto.SignerOpts) ([]byte, error)

Sign signs msg with priv, reading randomness from rand. This method is intended to support keys where the private part is kept in, for example, a hardware module. Common uses should use the Sign function in this package directly.

type PublicKey

type PublicKey struct {
	X, Y *big.Int

PublicKey represents an ECDSA public key.

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