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-rw-r--r--package.json3
-rw-r--r--src/ts/0x.js.ts32
-rw-r--r--src/ts/globals.d.ts1
-rw-r--r--test/0x.js.ts50
4 files changed, 79 insertions, 7 deletions
diff --git a/package.json b/package.json
index 340e042ce..091d54f7e 100644
--- a/package.json
+++ b/package.json
@@ -46,5 +46,8 @@
"typedoc": "^0.7.1",
"typescript": "^2.3.3",
"webpack": "^2.6.0"
+ },
+ "dependencies": {
+ "ethereumjs-util": "^5.1.1"
}
}
diff --git a/src/ts/0x.js.ts b/src/ts/0x.js.ts
index 95446ad74..6d6d5fed6 100644
--- a/src/ts/0x.js.ts
+++ b/src/ts/0x.js.ts
@@ -1,6 +1,32 @@
+import * as ethUtil from 'ethereumjs-util';
+
+/**
+ * Elliptic Curve signature
+ */
+export interface ECSignature {
+ v: number;
+ r: string;
+ s: string;
+}
+
+export type ETHAddress = string;
+
export class ZeroEx {
- /** Verifies the signature */
- public verifySignature() {
- // TODO
+ /**
+ * Checks if the signature is valid
+ */
+ public static isValidSignature(data: string, signature: ECSignature, signer: ETHAddress): boolean {
+ const dataBuff = ethUtil.toBuffer(data);
+ const msgHashBuff = ethUtil.hashPersonalMessage(dataBuff);
+ try {
+ const pubKey = ethUtil.ecrecover(msgHashBuff,
+ signature.v,
+ ethUtil.toBuffer(signature.r),
+ ethUtil.toBuffer(signature.s));
+ const retrievedAddress = ethUtil.bufferToHex(ethUtil.pubToAddress(pubKey));
+ return retrievedAddress === signer;
+ } catch (err) {
+ return false;
+ }
}
}
diff --git a/src/ts/globals.d.ts b/src/ts/globals.d.ts
new file mode 100644
index 000000000..99f9cf50b
--- /dev/null
+++ b/src/ts/globals.d.ts
@@ -0,0 +1 @@
+declare module 'ethereumjs-util';
diff --git a/test/0x.js.ts b/test/0x.js.ts
index 65475bf32..7216ed34f 100644
--- a/test/0x.js.ts
+++ b/test/0x.js.ts
@@ -3,10 +3,52 @@ import {expect} from 'chai';
import 'mocha';
describe('ZeroEx library', () => {
- describe('#verifySignature', () => {
- it('should return undefined', () => {
- const zeroEx = new ZeroEx();
- expect(zeroEx.verifySignature()).to.be.undefined;
+ describe('#isValidSignature', () => {
+ const data = '0xdeadbeaf';
+ const signature = {
+ v: 27,
+ r: '0xa3f20717a250c2b0b729b7e5becbff67fdaef7e0699da4de7ca5895b02a170a1',
+ s: '0x2d887fd3b17bfdce3481f10bea41f45ba9f709d39ce8325427b57afcfc994cee',
+ };
+ const address = '0x9b2055d370f73ec7d8a03e965129118dc8f5bf83';
+ describe('should return false for malformed signature', () => {
+ it('malformed v', () => {
+ const malformedSignature = {
+ v: 34,
+ r: signature.r,
+ s: signature.s,
+ };
+ const isValid = ZeroEx.isValidSignature(data, malformedSignature, address);
+ expect(isValid).to.be.false;
+ });
+ it('malformed r', () => {
+ const malformedSignature = {
+ v: signature.v,
+ r: signature.r.replace('0x', ''),
+ s: signature.s,
+ };
+ const isValid = ZeroEx.isValidSignature(data, malformedSignature, address);
+ expect(isValid).to.be.false;
+ });
+ });
+ describe('should return false for invalid signature', () => {
+ it('wrong data', () => {
+ const isValid = ZeroEx.isValidSignature('wrong data', signature, address);
+ expect(isValid).to.be.false;
+ });
+ it('wrong signer', () => {
+ const isValid = ZeroEx.isValidSignature(data, signature, '0xIamWrong');
+ expect(isValid).to.be.false;
+ });
+ it('wrong signature', () => {
+ const wrongSignature = Object.assign({}, signature, {v: 28});
+ const isValid = ZeroEx.isValidSignature(data, wrongSignature, address);
+ expect(isValid).to.be.false;
+ });
+ });
+ it('should return true for valid signature', () => {
+ const isValid = ZeroEx.isValidSignature(data, signature, address);
+ expect(isValid).to.be.true;
});
});
});