context length: " + strconv.Itoa(l)) } return signWithDom(signature, priv, message, domPrefixPh, context), nil } func SignCtx(priv *PrivateKey, message []byte, context string) ([]byte, error) { // Outline the function body so that the returned signature can be // stack-allocated. signature := make([]byte, signatureSize) return signCtx(signature, priv, message, context) } func signCtx(signature []byte, priv *PrivateKey, message []byte, context string) ([]byte, error) { fipsSelfTest() // FIPS 186-5 specifies...