generateSecretDate method
Generate the secret date for the request.
SecretDate = HMAC_SHA256("TC3" + SecretKey, Date)
Implementation
crypto.Digest generateSecretDate(DateTime date) {
final key = convert.utf8.encode('TC3$secretKey');
final data = convert.utf8.encode(generateDate(date));
return _hmacSha256(key, data);
}