arweave - npm Package Compare versions

Comparing version 0.1.0 to 1.0.0

dist/node/arweave/lib/crypto/crypto-interface.d.ts

@@ -5,3 +5,4 @@ import { JWKInterface } from "../Wallet";
     sign(jwk: JWKInterface, data: Uint8Array): Promise<Uint8Array>;
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>;
     hash(data: Uint8Array): Promise<Uint8Array>;
 }

dist/node/arweave/lib/crypto/node-driver.d.ts

@@ -9,11 +9,7 @@ /// <reference types="node" />
     generateJWK(): Promise<JWKInterface>;
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
     sign(jwk: object, data: Uint8Array): Promise<Uint8Array>;
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>;
     hash(data: Buffer): Promise<Uint8Array>;
-    private jwkToPem;
+    jwkToPem(jwk: object): string;
     private pemToJWK;
 }

dist/node/arweave/lib/crypto/node-driver.js

@@ -12,4 +12,4 @@ "use strict";
     generateJWK() {
-        if (typeof !crypto.generateKeyPair == 'function') {
-            throw new Error('Keypair generation not supported in this version of Node, only supported in versions 10.x+');
+        if (typeof crypto.generateKeyPair != "function") {
+            throw new Error('Keypair generation not supported in this version of Node, only supported in versions 10+');
         }
@@ -37,7 +37,2 @@ return new Promise((resolve, reject) => {
     }
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
     sign(jwk, data) {
@@ -55,2 +50,20 @@ return new Promise((resolve, reject) => {
     }
+    verify(publicModulus, data, signature) {
+        return new Promise((resolve, reject) => {
+            const publicKey = {
+                kty: 'RSA',
+                e: 'AQAB',
+                n: publicModulus,
+            };
+            const pem = this.jwkToPem(publicKey);
+            resolve(crypto
+                .createVerify(this.hashAlgorithm)
+                .update(data)
+                .verify({
+                key: pem,
+                padding: crypto.constants.RSA_PKCS1_PSS_PADDING,
+                saltLength: 0
+            }, signature));
+        });
+    }
     hash(data) {
@@ -65,6 +78,6 @@ return new Promise((resolve, reject) => {
     jwkToPem(jwk) {
-        return pem_1.jwk2pem(jwk);
+        return pem_1.jwkTopem(jwk);
     }
     pemToJWK(pem) {
-        let jwk = pem_1.pem2jwk(pem);
+        let jwk = pem_1.pemTojwk(pem);
         return jwk;
@@ -71,0 +84,0 @@ }

dist/node/arweave/lib/crypto/pem.d.ts

@@ -1,2 +0,2 @@
-export declare function pem2jwk(pem: any, extras?: any): any;
-export declare function jwk2pem(json: any): any;
+export declare function pemTojwk(pem: any, extras?: any): any;
+export declare function jwkTopem(json: any): any;

dist/node/arweave/lib/crypto/pem.js

@@ -120,3 +120,3 @@ "use strict";
 }
-function pem2jwk(pem, extras) {
+function pemTojwk(pem, extras) {
     var text = pem.toString().split(/(\r\n|\r|\n)+/g);
@@ -130,4 +130,4 @@ text = text.filter(function (line) {
 }
-exports.pem2jwk = pem2jwk;
-function jwk2pem(json) {
+exports.pemTojwk = pemTojwk;
+function jwkTopem(json) {
     var jwk = parse(json);
@@ -149,3 +149,3 @@ var isPrivate = !!(jwk.d);
 }
-exports.jwk2pem = jwk2pem;
+exports.jwkTopem = jwkTopem;
 //# sourceMappingURL=pem.js.map

dist/node/arweave/lib/crypto/webcrypto-driver.d.ts

@@ -10,11 +10,8 @@ import { JWKInterface } from "../Wallet";
     generateJWK(): Promise<JWKInterface>;
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
-    sign(jwk: JWKInterface, data: any): Promise<Uint8Array>;
+    sign(jwk: JWKInterface, data: Uint8Array): Promise<Uint8Array>;
     hash(data: Uint8Array): Promise<Uint8Array>;
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>;
     private jwkToCryptoKey;
+    private jwkToPublicCryptoKey;
     private detectWebCrypto;
 }

dist/node/arweave/lib/crypto/webcrypto-driver.js

@@ -39,7 +39,2 @@ "use strict";
     }
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
     async sign(jwk, data) {
@@ -60,2 +55,14 @@ let signature = await this
     }
+    async verify(publicModulus, data, signature) {
+        const publicKey = {
+            kty: 'RSA',
+            e: 'AQAB',
+            n: publicModulus,
+        };
+        const key = await this.jwkToPublicCryptoKey(publicKey);
+        return this.driver.verify({
+            name: 'RSA-PSS',
+            saltLength: 0,
+        }, key, signature, data);
+    }
     async jwkToCryptoKey(jwk) {
@@ -67,4 +74,12 @@ return this.driver.importKey('jwk', jwk, {
             }
-        }, false, ['sign']);
+        }, false, ["sign"]);
     }
+    async jwkToPublicCryptoKey(publicJwk) {
+        return this.driver.importKey('jwk', publicJwk, {
+            name: 'RSA-PSS',
+            hash: {
+                name: 'SHA-256',
+            }
+        }, false, ["verify"]);
+    }
     detectWebCrypto() {
@@ -71,0 +86,0 @@ if (!window || !window.crypto || !window.crypto.subtle) {

dist/node/arweave/lib/error.d.ts

@@ -5,3 +5,4 @@ import { AxiosResponse } from "axios";
     TX_NOT_FOUND = "TX_NOT_FOUND",
-    TX_FAILED = "TX_FAILED"
+    TX_FAILED = "TX_FAILED",
+    TX_INVALID = "TX_INVALID"
 }
@@ -8,0 +9,0 @@ export declare class ArweaveError extends Error {

dist/node/arweave/lib/Wallet.d.ts

@@ -12,1 +12,6 @@ export interface JWKInterface {
 }
+export interface JWKPublicInterface {
+    kty: string;
+    e: string;
+    n: string;
+}

dist/node/arweave/transactions.d.ts

@@ -15,3 +15,4 @@ /// <reference types="node" />
     sign(transaction: Transaction, jwk: JWKInterface): Promise<Transaction>;
+    verify(transaction: Transaction): Promise<boolean>;
     post(transaction: Transaction | Buffer | string | object): Promise<AxiosResponse>;
 }

dist/node/arweave/transactions.js

@@ -32,3 +32,3 @@ "use strict";
         return this.api.get(`tx/${id}`).then(response => {
-            if (response.status == 200) {
+            if (response.status == 200 && response.data && response.data.id == id) {
                 return new transaction_1.Transaction(response.data);
@@ -45,2 +45,3 @@ }
             }
+            new error_1.ArweaveError("TX_INVALID" /* TX_INVALID */);
         });
@@ -63,2 +64,18 @@ }
     }
+    async verify(transaction) {
+        const signaturePayload = transaction.getSignatureData();
+        /**
+         * The transaction ID should be a SHA-256 hash of the raw signature bytes, so this needs
+         * to be recalculated from the signature and checked against the transaction ID.
+         */
+        const rawSignature = transaction.get('signature', { decode: true, string: false });
+        const expectedId = utils_1.ArweaveUtils.bufferTob64Url(await this.crypto.hash(rawSignature));
+        if (transaction.id !== expectedId) {
+            throw new Error(`Invalid transaction signature or ID! The transaction ID doesn't match the expected SHA-256 hash of the signature.`);
+        }
+        /**
+         * Now verify the signature is valid and signed by the owner wallet (owner field = originating wallet public key).
+        */
+        return this.crypto.verify(transaction.owner, signaturePayload, rawSignature);
+    }
     post(transaction) {
@@ -65,0 +82,0 @@ return this.api.post(`tx`, transaction).then(response => {

dist/web.bundle.min.js

@@ -1,2 +0,2 @@
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dist/web/arweave/lib/crypto/crypto-interface.d.ts

@@ -5,3 +5,4 @@ import { JWKInterface } from "../Wallet";
     sign(jwk: JWKInterface, data: Uint8Array): Promise<Uint8Array>;
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>;
     hash(data: Uint8Array): Promise<Uint8Array>;
 }

dist/web/arweave/lib/crypto/node-driver.d.ts

@@ -9,11 +9,7 @@ /// <reference types="node" />
     generateJWK(): Promise<JWKInterface>;
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
     sign(jwk: object, data: Uint8Array): Promise<Uint8Array>;
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>;
     hash(data: Buffer): Promise<Uint8Array>;
-    private jwkToPem;
+    jwkToPem(jwk: object): string;
     private pemToJWK;
 }

dist/web/arweave/lib/crypto/node-driver.js

@@ -1,2 +0,2 @@
-import { pem2jwk, jwk2pem } from "./pem";
+import { pemTojwk, jwkTopem } from "./pem";
 const crypto = require('crypto');
@@ -10,4 +10,4 @@ export class NodeCryptoDriver {
     generateJWK() {
-        if (typeof !crypto.generateKeyPair == 'function') {
-            throw new Error('Keypair generation not supported in this version of Node, only supported in versions 10.x+');
+        if (typeof crypto.generateKeyPair != "function") {
+            throw new Error('Keypair generation not supported in this version of Node, only supported in versions 10+');
         }
@@ -35,7 +35,2 @@ return new Promise((resolve, reject) => {
     }
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
     sign(jwk, data) {
@@ -53,2 +48,20 @@ return new Promise((resolve, reject) => {
     }
+    verify(publicModulus, data, signature) {
+        return new Promise((resolve, reject) => {
+            const publicKey = {
+                kty: 'RSA',
+                e: 'AQAB',
+                n: publicModulus,
+            };
+            const pem = this.jwkToPem(publicKey);
+            resolve(crypto
+                .createVerify(this.hashAlgorithm)
+                .update(data)
+                .verify({
+                key: pem,
+                padding: crypto.constants.RSA_PKCS1_PSS_PADDING,
+                saltLength: 0
+            }, signature));
+        });
+    }
     hash(data) {
@@ -63,6 +76,6 @@ return new Promise((resolve, reject) => {
     jwkToPem(jwk) {
-        return jwk2pem(jwk);
+        return jwkTopem(jwk);
     }
     pemToJWK(pem) {
-        let jwk = pem2jwk(pem);
+        let jwk = pemTojwk(pem);
         return jwk;
@@ -69,0 +82,0 @@ }

dist/web/arweave/lib/crypto/pem.d.ts

@@ -1,2 +0,2 @@
-export declare function pem2jwk(pem: any, extras?: any): any;
-export declare function jwk2pem(json: any): any;
+export declare function pemTojwk(pem: any, extras?: any): any;
+export declare function jwkTopem(json: any): any;

dist/web/arweave/lib/crypto/pem.js

@@ -118,3 +118,3 @@ // @ts-ignore
 }
-export function pem2jwk(pem, extras) {
+export function pemTojwk(pem, extras) {
     var text = pem.toString().split(/(\r\n|\r|\n)+/g);
@@ -128,3 +128,3 @@ text = text.filter(function (line) {
 }
-export function jwk2pem(json) {
+export function jwkTopem(json) {
     var jwk = parse(json);
@@ -131,0 +131,0 @@ var isPrivate = !!(jwk.d);

dist/web/arweave/lib/crypto/webcrypto-driver.d.ts

@@ -10,11 +10,8 @@ import { JWKInterface } from "../Wallet";
     generateJWK(): Promise<JWKInterface>;
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
-    sign(jwk: JWKInterface, data: any): Promise<Uint8Array>;
+    sign(jwk: JWKInterface, data: Uint8Array): Promise<Uint8Array>;
     hash(data: Uint8Array): Promise<Uint8Array>;
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>;
     private jwkToCryptoKey;
+    private jwkToPublicCryptoKey;
     private detectWebCrypto;
 }

dist/web/arweave/lib/crypto/webcrypto-driver.js

@@ -37,7 +37,2 @@ export class WebCryptoDriver {
     }
-    /**
-     *
-     * @param jwk
-     * @param data
-     */
     async sign(jwk, data) {
@@ -58,2 +53,14 @@ let signature = await this
     }
+    async verify(publicModulus, data, signature) {
+        const publicKey = {
+            kty: 'RSA',
+            e: 'AQAB',
+            n: publicModulus,
+        };
+        const key = await this.jwkToPublicCryptoKey(publicKey);
+        return this.driver.verify({
+            name: 'RSA-PSS',
+            saltLength: 0,
+        }, key, signature, data);
+    }
     async jwkToCryptoKey(jwk) {
@@ -65,4 +72,12 @@ return this.driver.importKey('jwk', jwk, {
             }
-        }, false, ['sign']);
+        }, false, ["sign"]);
     }
+    async jwkToPublicCryptoKey(publicJwk) {
+        return this.driver.importKey('jwk', publicJwk, {
+            name: 'RSA-PSS',
+            hash: {
+                name: 'SHA-256',
+            }
+        }, false, ["verify"]);
+    }
     detectWebCrypto() {
@@ -69,0 +84,0 @@ if (!window || !window.crypto || !window.crypto.subtle) {

dist/web/arweave/lib/error.d.ts

@@ -5,3 +5,4 @@ import { AxiosResponse } from "axios";
     TX_NOT_FOUND = "TX_NOT_FOUND",
-    TX_FAILED = "TX_FAILED"
+    TX_FAILED = "TX_FAILED",
+    TX_INVALID = "TX_INVALID"
 }
@@ -8,0 +9,0 @@ export declare class ArweaveError extends Error {

dist/web/arweave/lib/Wallet.d.ts

@@ -12,1 +12,6 @@ export interface JWKInterface {
 }
+export interface JWKPublicInterface {
+    kty: string;
+    e: string;
+    n: string;
+}

dist/web/arweave/transactions.d.ts

@@ -15,3 +15,4 @@ /// <reference types="node" />
     sign(transaction: Transaction, jwk: JWKInterface): Promise<Transaction>;
+    verify(transaction: Transaction): Promise<boolean>;
     post(transaction: Transaction | Buffer | string | object): Promise<AxiosResponse>;
 }

dist/web/arweave/transactions.js

@@ -30,3 +30,3 @@ import { ArweaveError } from './lib/error';
         return this.api.get(`tx/${id}`).then(response => {
-            if (response.status == 200) {
+            if (response.status == 200 && response.data && response.data.id == id) {
                 return new Transaction(response.data);
@@ -43,2 +43,3 @@ }
             }
+            new ArweaveError("TX_INVALID" /* TX_INVALID */);
         });
@@ -61,2 +62,18 @@ }
     }
+    async verify(transaction) {
+        const signaturePayload = transaction.getSignatureData();
+        /**
+         * The transaction ID should be a SHA-256 hash of the raw signature bytes, so this needs
+         * to be recalculated from the signature and checked against the transaction ID.
+         */
+        const rawSignature = transaction.get('signature', { decode: true, string: false });
+        const expectedId = ArweaveUtils.bufferTob64Url(await this.crypto.hash(rawSignature));
+        if (transaction.id !== expectedId) {
+            throw new Error(`Invalid transaction signature or ID! The transaction ID doesn't match the expected SHA-256 hash of the signature.`);
+        }
+        /**
+         * Now verify the signature is valid and signed by the owner wallet (owner field = originating wallet public key).
+        */
+        return this.crypto.verify(transaction.owner, signaturePayload, rawSignature);
+    }
     post(transaction) {
@@ -63,0 +80,0 @@ return this.api.post(`tx`, transaction).then(response => {

dist/web/web.js

 import { Arweave } from "./arweave/arweave";
 import { WebCryptoDriver } from "./arweave/lib/crypto/webcrypto-driver";
-window.arweave = {
+window.Arweave = {
     init(apiConfig) {
@@ -5,0 +5,0 @@ return new Arweave({

package.json

 {
   "name": "arweave",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "description": "Arweave JS client library",
@@ -9,9 +9,7 @@ "main": "index.js",
     "compile:web": "tsc --declaration -project tsconfig.web.json",
-    "build:node": "npx webpack --config-name node",
-    "build:web": "npx webpack --config-name web",
-    "build:web-prod": "npx webpack --config-name web-prod",
-    "profile:node": "npx webpack --config-name node --json > ./node.profile.json && npx webpack-bundle-analyzer ./node.profile.json",
+    "bundle:web": "npx webpack --config-name web",
+    "bundle:web-prod": "npx webpack --config-name web-prod",
     "profile:web": "npx webpack --config-name web --json > ./web.profile.json && npx webpack-bundle-analyzer ./web.profile.json",
-    "build": "npm run compile:node && npm run compile:web && npm run build:node && npm run build:web && npm run build:web-prod",
-    "test": "mocha"
+    "build": "npm run compile:node && npm run compile:web && npm run bundle:web && npm run bundle:web-prod",
+    "test": "mocha --require ts-node/register test/*.ts"
   },
@@ -38,2 +36,4 @@ "repository": {
   "devDependencies": {
+    "@types/chai": "^4.1.7",
+    "@types/mocha": "^5.2.5",
     "@types/node": "^10.12.10",
@@ -43,2 +43,3 @@ "chai": "^4.2.0",
     "ts-loader": "^5.3.0",
+    "ts-node": "^7.0.1",
     "typescript": "^3.1.6",
@@ -59,2 +60,2 @@ "webpack": "^4.25.1",
   }
-}
+}

src/arweave/lib/crypto/crypto-interface.ts

@@ -9,3 +9,5 @@ import { JWKInterface } from "../Wallet";
 
-    hash(data: Uint8Array):  Promise<Uint8Array>
+    verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean>
+
+    hash(data: Uint8Array): Promise<Uint8Array>
 }

src/arweave/lib/crypto/node-driver.ts

 import { JWKInterface } from "../Wallet";
 import { CryptoInterface } from "./crypto-interface";
 
-import {pem2jwk, jwk2pem} from "./pem";
+import { pemTojwk, jwkTopem } from "./pem";
 
@@ -14,6 +14,5 @@ const crypto = require('crypto');
 
-    generateJWK(): Promise<JWKInterface> {
-
-        if (typeof !crypto.generateKeyPair == 'function') {
-            throw new Error('Keypair generation not supported in this version of Node, only supported in versions 10.x+');
+    public generateJWK(): Promise<JWKInterface> {
+        if (typeof crypto.generateKeyPair != "function") {
+            throw new Error('Keypair generation not supported in this version of Node, only supported in versions 10+');
         }
@@ -43,8 +42,3 @@
 
-    /**
-     * 
-     * @param jwk 
-     * @param data 
-     */
-    sign(jwk: object, data: Uint8Array): Promise<Uint8Array>{
+    public sign(jwk: object, data: Uint8Array): Promise<Uint8Array> {
         return new Promise((resolve, reject) => {
@@ -62,5 +56,28 @@ resolve(crypto
 
-    hash(data: Buffer): Promise<Uint8Array> {
+    public verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean> {
         return new Promise((resolve, reject) => {
+
+            const publicKey = {
+                kty: 'RSA',
+                e: 'AQAB',
+                n: publicModulus,
+            };
+
+            const pem = this.jwkToPem(publicKey);
+
             resolve(crypto
+                .createVerify(this.hashAlgorithm)
+                .update(data)
+                .verify({
+                    key: pem,
+                    padding: crypto.constants.RSA_PKCS1_PSS_PADDING,
+                    saltLength: 0
+                }, signature)
+            );
+        });
+    }
+
+    public hash(data: Buffer): Promise<Uint8Array> {
+        return new Promise((resolve, reject) => {
+            resolve(crypto
                 .createHash(this.hashAlgorithm)
@@ -73,8 +90,8 @@ .update(data)
 
-    private jwkToPem(jwk: object): string{
-        return jwk2pem(jwk);
+    public jwkToPem(jwk: object): string {
+        return jwkTopem(jwk);
     }
 
-    private pemToJWK(pem: string): JWKInterface{
-        let jwk = pem2jwk(pem);
+    private pemToJWK(pem: string): JWKInterface {
+        let jwk = pemTojwk(pem);
         return jwk;
@@ -81,0 +98,0 @@ }

src/arweave/lib/crypto/pem.ts

@@ -168,5 +168,5 @@ // @ts-ignore
 
-export function pem2jwk(pem: any, extras?: any): any {
+export function pemTojwk(pem: any, extras?: any): any {
   var text = pem.toString().split(/(\r\n|\r|\n)+/g)
-  text = text.filter(function(line: string) {
+  text = text.filter(function (line: string) {
     return line.trim().length !== 0
@@ -180,3 +180,3 @@ });
 
-export function jwk2pem(json: any): any {
+export function jwkTopem(json: any): any {
   var jwk = parse(json)
@@ -183,0 +183,0 @@ var isPrivate = !!(jwk.d)

src/arweave/lib/crypto/webcrypto-driver.ts

@@ -1,4 +0,3 @@
-import { JWKInterface } from "../Wallet";
+import { JWKInterface, JWKPublicInterface } from "../Wallet";
 import { CryptoInterface } from "./crypto-interface";
-import { ArweaveUtils } from "../utils";
 
@@ -13,3 +12,3 @@ export class WebCryptoDriver implements CryptoInterface {
 
-	constructor() {
+    constructor() {
         if (!this.detectWebCrypto()) {
@@ -23,3 +22,3 @@ throw new Error('SubtleCrypto not available!');
 
-    async generateJWK(): Promise<JWKInterface> {
+    public async generateJWK(): Promise<JWKInterface> {
 
@@ -50,25 +49,20 @@ let cryptoKey = await this
             'kty': jwk.kty,
-            'e'  : jwk.e,
-            'n'  : jwk.n,
-            'd'  : jwk.d,
-            'p'  : jwk.p,
-            'q'  : jwk.q,
-            'dp' : jwk.dp,
-            'dq' : jwk.dq,
-            'qi' : jwk.qi,
+            'e': jwk.e,
+            'n': jwk.n,
+            'd': jwk.d,
+            'p': jwk.p,
+            'q': jwk.q,
+            'dp': jwk.dp,
+            'dq': jwk.dq,
+            'qi': jwk.qi,
         };
     }
 
-    /**
-     * 
-     * @param jwk 
-     * @param data 
-     */
-    async sign(jwk: JWKInterface, data: any): Promise<Uint8Array>{
+    public async sign(jwk: JWKInterface, data: Uint8Array): Promise<Uint8Array> {
         let signature = await this
             .driver
             .sign({
-                    name: 'RSA-PSS',
-                    saltLength: 0,
-                },
+                name: 'RSA-PSS',
+                saltLength: 0,
+            },
                 (await this.jwkToCryptoKey(jwk)),
@@ -81,3 +75,3 @@ data
 
-    async hash(data: Uint8Array): Promise<Uint8Array> {
+    public async hash(data: Uint8Array): Promise<Uint8Array> {
         let digest = await this
@@ -93,3 +87,19 @@ .driver
 
-    private async jwkToCryptoKey(jwk: JWKInterface): Promise<CryptoKey>{
+    public async verify(publicModulus: string, data: Uint8Array, signature: Uint8Array): Promise<boolean> {
+
+        const publicKey = {
+            kty: 'RSA',
+            e: 'AQAB',
+            n: publicModulus,
+        };
+
+        const key = await this.jwkToPublicCryptoKey(publicKey);
+
+        return this.driver.verify({
+            name: 'RSA-PSS',
+            saltLength: 0,
+        }, key, signature, data);
+    }
+
+    private async jwkToCryptoKey(jwk: JWKInterface): Promise<CryptoKey> {
         return this.driver.importKey(
@@ -105,7 +115,22 @@ 'jwk',
             false,
-            ['sign']
+            ["sign"]
         );
     }
 
-    private detectWebCrypto(){
+    private async jwkToPublicCryptoKey(publicJwk: JWKPublicInterface): Promise<CryptoKey> {
+        return this.driver.importKey(
+            'jwk',
+            publicJwk,
+            {
+                name: 'RSA-PSS',
+                hash: {
+                    name: 'SHA-256',
+                }
+            },
+            false,
+            ["verify"]
+        );
+    }
+
+    private detectWebCrypto() {
         if (!window || !window.crypto || !window.crypto.subtle) {
@@ -112,0 +137,0 @@ return false;

src/arweave/lib/error.ts

@@ -7,5 +7,6 @@ import { AxiosResponse } from "axios";
     TX_FAILED = 'TX_FAILED',
+    TX_INVALID = 'TX_INVALID',
 };
 
-export class ArweaveError extends Error{
+export class ArweaveError extends Error {
 
@@ -15,3 +16,3 @@ public readonly type: ArweaveErrorType;
 
-	constructor(type: ArweaveErrorType, optional?: {
+    constructor(type: ArweaveErrorType, optional?: {
         message?: string,
@@ -24,7 +25,7 @@ response?: AxiosResponse,
             super(optional.message);
-        }else{
+        } else {
             super();
         }
 
-        
+
         this.type = type;
@@ -34,3 +35,3 @@ this.response = optional.response;
 
-    public getType(): ArweaveErrorType{
+    public getType(): ArweaveErrorType {
         return this.type;
@@ -37,0 +38,0 @@ }

src/arweave/lib/transaction.ts

@@ -5,7 +5,7 @@ import { ArweaveUtils } from './utils';
 
-    [key:string]: any;
+    [key: string]: any;
 
     public get(field: string): string;
-    public get(field: string, options: {decode: true, string: false}): Uint8Array;
-    public get(field: string, options: {decode: true, string: true}): string;
+    public get(field: string, options: { decode: true, string: false }): Uint8Array;
+    public get(field: string, options: { decode: true, string: true }): string;
 
@@ -15,19 +15,19 @@ public get(field: string, options?: {
         decode?: boolean
-     }): string | Uint8Array | Tag[] {
-     
+    }): string | Uint8Array | Tag[] {
+
         if (!Object.getOwnPropertyNames(this).includes(field)) {
             throw new Error(`Field "${field}" is not a property of the Arweave Transaction class.`);
         }
-     
+
         if (options && options.decode == true) {
-     
+
             if (options && options.string) {
                 return ArweaveUtils.b64UrlToString(this[field]);
             }
-     
+
             return ArweaveUtils.b64UrlToBuffer(this[field]);
         }
-     
+
         return this[field];
-     }
+    }
 }
@@ -40,3 +40,3 @@
 
-    public constructor(name: string, value: string, decode = false){
+    public constructor(name: string, value: string, decode = false) {
         super();
@@ -51,3 +51,3 @@ this.name = name;
 
-    [key:string]: any
+    [key: string]: any
 
@@ -57,3 +57,3 @@ id: string,
     owner: string,
-    tags:  Tag[],
+    tags: Tag[],
     target: string,
@@ -67,9 +67,9 @@ quantity: string,
 
-export class Transaction  extends BaseObject implements TransactionInterface {
+export class Transaction extends BaseObject implements TransactionInterface {
 
-    [key:string]: any
+    [key: string]: any
 
     public id: string;
-    public readonly last_tx:string = '';
-    public readonly owner:string  = '';
+    public readonly last_tx: string = '';
+    public readonly owner: string = '';
     public readonly tags: Tag[] = [];
@@ -85,5 +85,11 @@ public readonly target: string = '';
         Object.assign(this, attributes);
+
+        if (attributes.tags) {
+            this.tags = attributes.tags.map((tag: { name: string, value: string }) => {
+                return new Tag(tag.name, tag.value);
+            });
+        }
     }
 
-    public addTag(name: string, value: string){
+    public addTag(name: string, value: string) {
         this.tags.push(new Tag(
@@ -95,3 +101,3 @@ ArweaveUtils.stringToB64Url(name),
 
-    public toJSON(){
+    public toJSON() {
         return {
@@ -110,3 +116,3 @@ id: this.id,
 
-    public setSignature({signature, id}: {
+    public setSignature({ signature, id }: {
         signature: string,
@@ -122,15 +128,15 @@ id: string,
         let tagString = this.tags.reduce((accumulator: string, tag: Tag) => {
-            return accumulator + '' + tag.get('name', {decode: true, string: true}) + '' + tag.get('value', {decode: true, string: true})
+            return accumulator + tag.get('name', { decode: true, string: true }) + tag.get('value', { decode: true, string: true })
         }, '');
 
         return ArweaveUtils.concatBuffers([
-            this.get('owner', {decode: true, string: false}),
-            this.get('target', {decode: true, string: false}),
-            this.get('data', {decode: true, string: false}),
+            this.get('owner', { decode: true, string: false }),
+            this.get('target', { decode: true, string: false }),
+            this.get('data', { decode: true, string: false }),
             ArweaveUtils.stringToBuffer(this.quantity),
             ArweaveUtils.stringToBuffer(this.reward),
-            this.get('last_tx', {decode: true, string: false}),
+            this.get('last_tx', { decode: true, string: false }),
             ArweaveUtils.stringToBuffer(tagString)
         ]);
     }
-}
+}

src/arweave/lib/wallet.ts

@@ -12,1 +12,7 @@ export interface JWKInterface {
 }
+
+export interface JWKPublicInterface {
+    kty: string;
+    e: string;
+    n: string;
+}

src/arweave/transactions.ts

@@ -16,3 +16,3 @@ import { Api } from "./lib/api";
 
-    constructor(api: Api, crypto: CryptoInterface){
+    constructor(api: Api, crypto: CryptoInterface) {
         this.api = api;
@@ -35,7 +35,7 @@ this.crypto = crypto;
                  */
-                function(data): string {
-                return data;
-              }
+                function (data): string {
+                    return data;
+                }
             ]
-        }).then( response => {
+        }).then(response => {
             return response.data;
@@ -46,5 +46,5 @@ });
     public get(id: string): Promise<Transaction> {
-        return this.api.get(`tx/${id}`).then( response => {
+        return this.api.get(`tx/${id}`).then(response => {
 
-            if (response.status == 200) {
+            if (response.status == 200 && response.data && response.data.id == id) {
                 return new Transaction(response.data);
@@ -65,2 +65,4 @@ }
 
+            new ArweaveError(ArweaveErrorType.TX_INVALID);
+
         });
@@ -70,3 +72,3 @@ }
     public getStatus(id: string): Promise<number> {
-        return this.api.get(`tx/${id}/id`).then( response => {
+        return this.api.get(`tx/${id}/id`).then(response => {
             return response.status;
@@ -92,4 +94,30 @@ });
 
-    public post(transaction: Transaction|Buffer|string|object): Promise<AxiosResponse> {
-        return this.api.post(`tx`, transaction).then( response => {
+    public async verify(transaction: Transaction): Promise<boolean> {
+
+        const signaturePayload = transaction.getSignatureData();
+
+        /**
+         * The transaction ID should be a SHA-256 hash of the raw signature bytes, so this needs
+         * to be recalculated from the signature and checked against the transaction ID.
+         */
+        const rawSignature = transaction.get('signature', { decode: true, string: false });
+
+        const expectedId = ArweaveUtils.bufferTob64Url(await this.crypto.hash(rawSignature));
+
+        if (transaction.id !== expectedId) {
+            throw new Error(`Invalid transaction signature or ID! The transaction ID doesn't match the expected SHA-256 hash of the signature.`);
+        }
+
+        /**
+         * Now verify the signature is valid and signed by the owner wallet (owner field = originating wallet public key).
+        */
+        return this.crypto.verify(
+            transaction.owner,
+            signaturePayload,
+            rawSignature
+        );
+    }
+
+    public post(transaction: Transaction | Buffer | string | object): Promise<AxiosResponse> {
+        return this.api.post(`tx`, transaction).then(response => {
             return response;
@@ -96,0 +124,0 @@ });

src/web.ts

@@ -5,3 +5,3 @@ import { Arweave } from "./arweave/arweave";
 
-(<any>window).arweave = {
+(<any>window).Arweave = {
     init(apiConfig: object): Arweave {
@@ -8,0 +8,0 @@ return new Arweave({

webpack.config.js

 const path = require('path');
-const webpack = require("webpack");
 
 const config = {};
 
-config.node = {
-    name: 'node',
-    entry: './src/node.ts',
-    mode: 'development',
-    target: 'node',
-    module: {
-        rules: [
-            {
-                test: /\.ts?$/,
-                use: 'ts-loader',
-                exclude: /node_modules/
-            }
-        ]
-    },
-    resolve: {
-        extensions: ['.tsx', '.ts', '.js']
-    },
-    devtool: 'inline-source-map',
-    devServer: {
-        contentBase: './dist'
-    },
-    plugins: [],
-    output: {
-        filename: 'node.bundle.js',
-        path: path.resolve(__dirname, 'dist')
-    }
-};
-
 config.web = {
@@ -87,2 +58,2 @@ name: 'web',
 
-module.exports = [config.node, config.web, config.webprod];
+module.exports = [config.web, config.webprod];

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