Documentation
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Overview ¶
A merkle tree for lanyard.org. merkle uses keccak256 hashing for leaves and intermediary nodes and therefore is vulnerable to a second preimage attack. This package does not duplicate or pad leaves in the case of odd cardinality and therefore may be unsafe for certain use cases. If you are curious about this type of bug, see the following bitcoin issue.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
Types ¶
type Tree ¶
type Tree [][][]byte
A the outer list represents levels in the tree. Each level is a list of nodes in the tree. Each node is a hash of its children.
Example ¶
var addrStrs = []string{
"0xE124F06277b5AC791bA45B92853BA9A0ea93327D",
"0x07d048f78B7C093B3Ef27D478B78026a70D9734e",
"0x38976611f5f7bEAd7e79E752f5B80AE72dD3eFa7",
"0x1Ab00ffedD724B930080aD30269083F1453cF34E",
"0x860a6bC426C3bb1186b2E11Ac486ABa000C209B4",
"0x0B3eC21fc53AD8b17AF4A80723c1496541fCb35f",
"0x2D13F6CEe6dA8b30a84ee7954594925bd5E47Ab7",
"0x3C64Cd43331beb5B6fAb76dbAb85226955c5CC3A",
"0x238dA873f984188b4F4c7efF03B5580C65a49dcB",
"0xbAfC038aDfd8BcF6E632C797175A057714416d04",
}
var addrs [][]byte
for i := range addrStrs {
addrs = append(addrs, common.HexToAddress(addrStrs[i]).Bytes())
}
var tr Tree
tr = New(addrs)
fmt.Println(common.Bytes2Hex(tr.Root()))
Output: ed40d49077a2cd13601cf79a512e6b92c7fd0f952e7dc9f4758d7134f9712bc4
func New ¶
Returns a complete Tree using items for the leaves. Intermediary nodes and items will be hashed using Keccak256.
func (Tree) Index ¶ added in v1.0.4
Returns the index of the target leaf in the tree. If the target is not a leaf in the tree, returns -1.
func (Tree) LeafProofs ¶ added in v1.0.4
Returns proofs for all leafs in the tree. For details on how an individual proof is calculated, see Tree.Proof.
func (Tree) Proof ¶
Returns a list of hashes such that cumulatively hashing the list pairwise will yield the root hash of the tree. Example:
[abcde] [abcd, e] [ab, cd, e] [a, b, c, d, e]
If the target is 'c' Proof returns: [d, ab, e]
If the target is 'e' Proof returns: [cd]
The result of this func will be used in Valid
Source Files