rfc6979

func SignECDSA ¶

func SignECDSA(priv *ecdsa.PrivateKey, digest []byte, alg func() hash.Hash) (r, s *big.Int)

SignECDSA 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.

Note that FIPS 186-3 section 4.6 specifies that the hash should be truncated to the byte-length of the subgroup. This function does not perform that truncation itself.