ecdsa.GenerateKey
// GenerateKey generates a public and private key pair.
func GenerateKey(c elliptic.Curve, rand io.Reader) (*PrivateKey, error)
ecdsa.Sign
// Sign signs a hash (which should be the result of hashing a larger message)
// using the private key, priv. If the hash is longer than the bit-length of the
// private key's curve order, the hash will be truncated to that length. It
// returns the signature as a pair of integers. Most applications should use
// SignASN1 instead of dealing directly with r, s.
func Sign(rand io.Reader, priv *PrivateKey, hash []byte) (r *big.Int, s *big.Int, err error)
ecdsa.SignASN1
// SignASN1 signs a hash (which should be the result of hashing a larger message)
// using the private key, priv. If the hash is longer than the bit-length of the
// private key's curve order, the hash will be truncated to that length. It
// returns the ASN.1 encoded signature.
func SignASN1(rand io.Reader, priv *PrivateKey, hash []byte) ([]byte, error)
ecdsa.Verify
// Verify verifies the signature in r, s of hash using the public key, pub. Its
// return value records whether the signature is valid. Most applications should
// use VerifyASN1 instead of dealing directly with r, s.
func Verify(pub *PublicKey, hash []byte, r *big.Int, s *big.Int) bool
ecdsa.VerifyASN1
// VerifyASN1 verifies the ASN.1 encoded signature, sig, of hash using the
// public key, pub. Its return value records whether the signature is valid.
func VerifyASN1(pub *PublicKey, hash []byte, sig []byte) bool