/**
* Checks if the signature is valid (transaction has not been tampered with).
* It uses the fromAddress as the public key.
*
* @returns {boolean}
*/
public bool IsValid()
{
try
{
if (this.signature == null)
{
return(false);
}
if (this.signature.Length == 0)
{
return(false);
}
// check the fromAccount is the signingKey
string error;
if (!CryptoKeyUtility.IsValidSignature(signature, encryptKey, initVector, fromAccount, out error))
{
return(false);
}
return(true);
}
catch
{
return(false);
}
}
/**
* Signs a transaction with the given signingKey (which is an Elliptic keypair
* object that contains a private key). The signature is then stored inside the
* transaction object and later stored on the blockchain.
*
* @param {string} signingKey
*/
public bool SignTransaction(string signingKey, out string error)
{
try
{
error = null;
var encryptResult = CryptoKeyUtility.GenerateKeyFromString(signingKey, out error);
if (encryptResult == null)
{
throw new Exception(error);
}
this.signature = encryptResult.Item1;
this.encryptKey = encryptResult.Item2;
this.initVector = encryptResult.Item3;
return(true);
}
catch (Exception ex)
{
error = ex.Message;
this.signature = null;
this.encryptKey = null;
this.initVector = null;
return(false);
}
}
