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merkletreejs
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add getting started example

This commit is contained in:
Miguel Mota 2018-12-09 19:10:43 -08:00
parent 02f9f9b80f
commit 069cc98640
5 changed files with 318 additions and 218 deletions
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43
README.md
View File

@ -12,6 +12,7 @@
- [Diagrams](#diagrams) - [Diagrams](#diagrams)
- [Install](#install) - [Install](#install)
- [Getting started](#Getting-started)
- [Documentation](#documentation) - [Documentation](#documentation)
- [Test](#test) - [Test](#test)
- [FAQ](#faq) - [FAQ](#faq)
@ -43,6 +44,48 @@ Diagram of Bitcoin Merkle Tree
npm install merkletreejs npm install merkletreejs
``` ```
## Getting started
Construct tree, generate proof, and verify proof:
```bash
const MerkleTree = require('merkletreejs')
const SHA256 = require('crypto-js/sha256')
const leaves = ['a', 'b', 'c'].map(x => SHA256(x))
const tree = new MerkleTree(leaves, SHA256)
const root = tree.getRoot().toString('hex')
const leaf = SHA256('a')
const proof = tree.getProof(leaf)
console.log(tree.verify(proof, leaf, root)) // true
const badLeaves = ['a', 'x', 'c'].map(x => SHA256(x))
const badTree = new MerkleTree(badLeaves, SHA256)
const badLeaf = SHA256('x')
const badProof = tree.getProof(badLeaf)
console.log(tree.verify(badProof, leaf, root)) // false
```
Print tree to console:
```js
const leaves = ['a', 'b', 'c'].map(x => sha3(x))
const tree = new MerkleTree(leaves, sha256)
MerkleTree.print(tree)
```
Output
```bash
└─ 311d2e46f49b15fff8b746b74ad57f2cc9e0d9939fda94387141a2d3fdf187ae
├─ 176f0f307632fdd5831875eb709e2f68d770b102262998b214ddeb3f04164ae1
│ ├─ 3ac225168df54212a25c1c01fd35bebfea408fdac2e31ddd6f80a4bbf9a5f1cb
│ └─ b5553de315e0edf504d9150af82dafa5c4667fa618ed0a6f19c69b41166c5510
└─ 0b42b6393c1f53060fe3ddbfcd7aadcca894465a5a438f69c87d790b2299b9b2
└─ 0b42b6393c1f53060fe3ddbfcd7aadcca894465a5a438f69c87d790b2299b9b2
```
## Documentation ## Documentation
## Classes ## Classes

34
index.js
View File

@ -1,5 +1,6 @@
const reverse = require('buffer-reverse') const reverse = require('buffer-reverse')
const CryptoJS = require('crypto-js') const CryptoJS = require('crypto-js')
const treeify = require('treeify')
/** /**
* Class reprensenting a Merkle Tree * Class reprensenting a Merkle Tree
@ -220,6 +221,7 @@ class MerkleTree {
*/ */
verify(proof, targetNode, root) { verify(proof, targetNode, root) {
let hash = bufferify(targetNode) let hash = bufferify(targetNode)
root = bufferify(root)
if (!Array.isArray(proof) || if (!Array.isArray(proof) ||
!proof.length || !proof.length ||
@ -256,6 +258,38 @@ class MerkleTree {
static bufferify(x) { static bufferify(x) {
return bufferify(x) return bufferify(x)
} }
static print(tree, opts) {
opts = opts || {}
const log = opts instanceof Object && opts.log !== false
const layers = tree.getLayers().map(x => x.map(x => x.toString('hex')))
const objs = []
for (let i = 0; i < layers.length; i++) {
const arr = []
for (let j = 0; j < layers[i].length; j++) {
const obj = { [layers[i][j]]: {} }
if (objs.length) {
const a = objs.shift()
const akey = Object.keys(a)[0]
obj[layers[i][j]][akey] = a[akey]
if (objs.length) {
const b = objs.shift()
const bkey = Object.keys(b)[0]
obj[layers[i][j]][bkey] = b[bkey]
}
}
arr.push(obj)
}
objs.push(...arr)
}
const str = treeify.asTree(objs[0], true)
if (log) console.log(str)
return str
}
} }
function bufferify(x) { function bufferify(x) {

439
package-lock.json generated
View File

@ -16,7 +16,7 @@
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@ -42,7 +42,7 @@
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@ -51,7 +51,7 @@
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@ -62,7 +62,7 @@
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@ -89,7 +89,7 @@
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@ -110,7 +110,7 @@
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@ -126,12 +126,12 @@
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@ -151,9 +151,9 @@
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} }
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@ -169,7 +169,7 @@
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} }
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@ -179,8 +179,8 @@
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@ -189,8 +189,8 @@
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@ -200,8 +200,8 @@
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}, },
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@ -220,8 +220,8 @@
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} }
}, },
"command-line-args": { "command-line-args": {
@ -230,9 +230,9 @@
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} }
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"command-line-tool": { "command-line-tool": {
@ -241,11 +241,11 @@
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@ -254,7 +254,7 @@
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@ -265,10 +265,10 @@
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@ -277,7 +277,7 @@
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} }
@ -300,7 +300,7 @@
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@ -317,11 +317,11 @@
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"ripemd160": "2.0.2", "ripemd160": "^2.0.1",
"sha.js": "2.4.11" "sha.js": "^2.4.0"
} }
}, },
"create-hmac": { "create-hmac": {
@ -330,12 +330,12 @@
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"ripemd160": "2.0.2", "ripemd160": "^2.0.0",
"safe-buffer": "5.1.2", "safe-buffer": "^5.0.1",
"sha.js": "2.4.11" "sha.js": "^2.4.8"
} }
}, },
"crypto": { "crypto": {
@ -380,18 +380,18 @@
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"file-set": "2.0.0", "file-set": "^2.0.0",
"handlebars": "4.0.11", "handlebars": "^4.0.11",
"marked": "0.3.19", "marked": "^0.3.16",
"object-get": "2.1.0", "object-get": "^2.1.0",
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"reduce-unique": "1.0.0", "reduce-unique": "^1.0.0",
"reduce-without": "1.0.1", "reduce-without": "^1.0.1",
"test-value": "3.0.0", "test-value": "^3.0.0",
"walk-back": "3.0.0" "walk-back": "^3.0.0"
}, },
"dependencies": { "dependencies": {
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@ -400,8 +400,8 @@
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"dev": true, "dev": true,
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"typical": "2.6.1" "typical": "^2.6.1"
} }
} }
} }
@ -412,9 +412,9 @@
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} }
}, },
"elliptic": { "elliptic": {
@ -423,13 +423,13 @@
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"dev": true, "dev": true,
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"inherits": "2.0.3", "inherits": "^2.0.1",
"minimalistic-assert": "1.0.1", "minimalistic-assert": "^1.0.0",
"minimalistic-crypto-utils": "1.0.1" "minimalistic-crypto-utils": "^1.0.0"
} }
}, },
"escape-string-regexp": { "escape-string-regexp": {
@ -444,8 +444,8 @@
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} }
}, },
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@ -454,13 +454,13 @@
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"ethjs-util": "0.1.6", "ethjs-util": "^0.1.3",
"keccak": "1.4.0", "keccak": "^1.0.2",
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"dev": true, "dev": true,
"requires": { "requires": {
"typical": "2.6.1" "typical": "^2.6.0"
} }
} }
} }
@ -1096,7 +1096,7 @@
"integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=", "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
"dev": true, "dev": true,
"requires": { "requires": {
"amdefine": "1.0.1" "amdefine": ">=0.0.4"
} }
}, },
"stream-connect": { "stream-connect": {
@ -1105,7 +1105,7 @@
"integrity": "sha1-GLyB8u2zW4tdmoAJIAqYUxRCipc=", "integrity": "sha1-GLyB8u2zW4tdmoAJIAqYUxRCipc=",
"dev": true, "dev": true,
"requires": { "requires": {
"array-back": "1.0.4" "array-back": "^1.0.2"
}, },
"dependencies": { "dependencies": {
"array-back": { "array-back": {
@ -1114,7 +1114,7 @@
"integrity": "sha1-ZEun8JX3/898Q7Xw3DnTwfA8Bjs=", "integrity": "sha1-ZEun8JX3/898Q7Xw3DnTwfA8Bjs=",
"dev": true, "dev": true,
"requires": { "requires": {
"typical": "2.6.1" "typical": "^2.6.0"
} }
} }
} }
@ -1146,11 +1146,11 @@
"integrity": "sha512-uNaR3SRMJwfdp9OUr36eyEi6LLsbcTqTO/hfTsNviKsNeyMBPICJCC7QXRF3+07bAP6FRwA8rczJPBqXDc0CkQ==", "integrity": "sha512-uNaR3SRMJwfdp9OUr36eyEi6LLsbcTqTO/hfTsNviKsNeyMBPICJCC7QXRF3+07bAP6FRwA8rczJPBqXDc0CkQ==",
"dev": true, "dev": true,
"requires": { "requires": {
"array-back": "2.0.0", "array-back": "^2.0.0",
"deep-extend": "0.6.0", "deep-extend": "~0.6.0",
"lodash.padend": "4.6.1", "lodash.padend": "^4.6.1",
"typical": "2.6.1", "typical": "^2.6.1",
"wordwrapjs": "3.0.0" "wordwrapjs": "^3.0.0"
} }
}, },
"taffydb": { "taffydb": {
@ -1165,13 +1165,13 @@
"integrity": "sha1-SJPdU+KApfWMDOswwsDrs7zVHh8=", "integrity": "sha1-SJPdU+KApfWMDOswwsDrs7zVHh8=",
"dev": true, "dev": true,
"requires": { "requires": {
"deep-equal": "0.2.2", "deep-equal": "~0.2.0",
"defined": "0.0.0", "defined": "~0.0.0",
"glob": "3.2.11", "glob": "~3.2.9",
"inherits": "2.0.3", "inherits": "~2.0.1",
"object-inspect": "0.4.0", "object-inspect": "~0.4.0",
"resumer": "0.0.0", "resumer": "~0.0.0",
"through": "2.3.8" "through": "~2.3.4"
}, },
"dependencies": { "dependencies": {
"glob": { "glob": {
@ -1180,8 +1180,8 @@
"integrity": "sha1-Spc/Y1uRkPcV0QmH1cAP0oFevj0=", "integrity": "sha1-Spc/Y1uRkPcV0QmH1cAP0oFevj0=",
"dev": true, "dev": true,
"requires": { "requires": {
"inherits": "2.0.3", "inherits": "2",
"minimatch": "0.3.0" "minimatch": "0.3"
} }
}, },
"minimatch": { "minimatch": {
@ -1190,8 +1190,8 @@
"integrity": "sha1-J12O2qxPG7MyZHIInnlJyDlGmd0=", "integrity": "sha1-J12O2qxPG7MyZHIInnlJyDlGmd0=",
"dev": true, "dev": true,
"requires": { "requires": {
"lru-cache": "2.7.3", "lru-cache": "2",
"sigmund": "1.0.1" "sigmund": "~1.0.0"
} }
} }
} }
@ -1208,8 +1208,8 @@
"integrity": "sha1-Edpv9nDzRxpztiXKTz/c97t0gpE=", "integrity": "sha1-Edpv9nDzRxpztiXKTz/c97t0gpE=",
"dev": true, "dev": true,
"requires": { "requires": {
"array-back": "1.0.4", "array-back": "^1.0.3",
"typical": "2.6.1" "typical": "^2.6.0"
}, },
"dependencies": { "dependencies": {
"array-back": { "array-back": {
@ -1218,7 +1218,7 @@
"integrity": "sha1-ZEun8JX3/898Q7Xw3DnTwfA8Bjs=", "integrity": "sha1-ZEun8JX3/898Q7Xw3DnTwfA8Bjs=",
"dev": true, "dev": true,
"requires": { "requires": {
"typical": "2.6.1" "typical": "^2.6.0"
} }
} }
} }
@ -1229,6 +1229,11 @@
"integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=", "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
"dev": true "dev": true
}, },
"treeify": {
"version": "1.1.0",
"resolved": "https://registry.npmjs.org/treeify/-/treeify-1.1.0.tgz",
"integrity": "sha512-1m4RA7xVAJrSGrrXGs0L3YTwyvBs2S8PbRHaLZAkFw7JR8oIFwYtysxlBZhYIa7xSyiYJKZ3iGrrk55cGA3i9A=="
},
"typical": { "typical": {
"version": "2.6.1", "version": "2.6.1",
"resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz", "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
@ -1242,9 +1247,9 @@
"dev": true, "dev": true,
"optional": true, "optional": true,
"requires": { "requires": {
"source-map": "0.5.7", "source-map": "~0.5.1",
"uglify-to-browserify": "1.0.2", "uglify-to-browserify": "~1.0.0",
"yargs": "3.10.0" "yargs": "~3.10.0"
}, },
"dependencies": { "dependencies": {
"source-map": { "source-map": {
@ -1311,8 +1316,8 @@
"integrity": "sha512-mO8XtqyPvykVCsrwj5MlOVWvSnCdT+C+QVbm6blradR7JExAhbkZ7hZ9A+9NUtwzSqrlUo9a67ws0EiILrvRpw==", "integrity": "sha512-mO8XtqyPvykVCsrwj5MlOVWvSnCdT+C+QVbm6blradR7JExAhbkZ7hZ9A+9NUtwzSqrlUo9a67ws0EiILrvRpw==",
"dev": true, "dev": true,
"requires": { "requires": {
"reduce-flatten": "1.0.1", "reduce-flatten": "^1.0.1",
"typical": "2.6.1" "typical": "^2.6.1"
} }
}, },
"wrappy": { "wrappy": {
@ -1328,9 +1333,9 @@
"dev": true, "dev": true,
"optional": true, "optional": true,
"requires": { "requires": {
"camelcase": "1.2.1", "camelcase": "^1.0.2",
"cliui": "2.1.0", "cliui": "^2.1.0",
"decamelize": "1.2.0", "decamelize": "^1.0.0",
"window-size": "0.1.0" "window-size": "0.1.0"
} }
} }

3
package.json
View File

@ -47,6 +47,7 @@
"dependencies": { "dependencies": {
"buffer-reverse": "^1.0.1", "buffer-reverse": "^1.0.1",
"crypto-js": "^3.1.9-1", "crypto-js": "^3.1.9-1",
"is-buffer": "^2.0.3" "is-buffer": "^2.0.3",
"treeify": "^1.1.0"
} }
} }

17
test/index.js
View File

@ -309,3 +309,20 @@ test('crypto-js bufferify', t => {
t.deepEqual(leaves.map(MerkleTree.bufferify), leaves.map(bufferifyCryptoJS)) t.deepEqual(leaves.map(MerkleTree.bufferify), leaves.map(bufferifyCryptoJS))
}) })
test('print', t => {
t.plan(1)
const leaves = ['a', 'b', 'c'].map(x => sha3(x))
const tree = new MerkleTree(leaves, sha256)
const str = MerkleTree.print(tree, {log: false})
t.equal(str,
`└─ 311d2e46f49b15fff8b746b74ad57f2cc9e0d9939fda94387141a2d3fdf187ae
├─ 176f0f307632fdd5831875eb709e2f68d770b102262998b214ddeb3f04164ae1
│ ├─ 3ac225168df54212a25c1c01fd35bebfea408fdac2e31ddd6f80a4bbf9a5f1cb
│ └─ b5553de315e0edf504d9150af82dafa5c4667fa618ed0a6f19c69b41166c5510
└─ 0b42b6393c1f53060fe3ddbfcd7aadcca894465a5a438f69c87d790b2299b9b2
└─ 0b42b6393c1f53060fe3ddbfcd7aadcca894465a5a438f69c87d790b2299b9b2
`)
})