public ValidationResult Validate(MerkleNode tree)
{
if (tree == null)
{
return(new ValidationResult(true));
}
if (tree.GetType() == typeof(Model.Transaction.Node))
{
var node = (Model.Transaction.Node)tree;
var combinedHashes = $"{node.LeftNode.Hash}{node.RightNode?.Hash}";
var hash = EncryptionService.GetSha256Hash(combinedHashes);
if (hash != node.Hash)
{
return(new ValidationResult(false,
$"Wrong hash for nodes with hashes h1:{node.LeftNode.Hash} and h2: {node.RightNode?.Hash}"));
}
var leftNodeValidationResult = Validate(node.LeftNode);
var rightNodeValidationResult = Validate(node.RightNode);
return(new ValidationResult(leftNodeValidationResult.IsSuccess && rightNodeValidationResult.IsSuccess,
leftNodeValidationResult.Errors.Concat(rightNodeValidationResult.Errors).ToArray()));
}
if (tree.GetType() != typeof(Leaf))
{
return(new ValidationResult(false, "Wrong type of merkle tree node!"));
}
var leaf = (Leaf)tree;
var transactionJson = leaf.Transaction.TransactionJson;
var transactionHash = EncryptionService.GetSha256Hash(transactionJson);
return(leaf.Hash != transactionHash
? new ValidationResult(false, $"Wrong hash for transaction with id: {leaf.TransactionId}")
: new ValidationResult(true));
}
