Implement signature

test/signature.test.ts

@@ -0,0 +1,57 @@
+import {test, expect} from 'bun:test'
+
+import {signature} from '../index'
+
+test('base case', async () => {
+    let keypair = await signature.gen_keypair()
+    let data = new TextEncoder().encode("Message 123 !")
+
+    const sig = (await signature.sign(keypair[0], data)).expect("Should sign the message")
+    let verification = await signature.verify(keypair[1], data, sig)
+
+    expect(verification).toBe(true)
+})
+
+test('inverted keys', async () => {
+    let keypair = await signature.gen_keypair()
+    let data = new TextEncoder().encode("Message 123 !")
+
+    ;(await signature.sign(keypair[1], data)).expect_err("Shouldn't sign the message with the wrong key")
+
+    const sig = (await signature.sign(keypair[0], data)).expect("Should sign the message")
+    let verification = await signature.verify(keypair[0], data, sig)
+    expect(verification).toBe(false)
+})
+
+test('tampered message', async () => {
+    let keypair = await signature.gen_keypair()
+    let data1 = new TextEncoder().encode("Message 123 !")
+    let data2 = new TextEncoder().encode("Message 321 !")
+    expect(data1).not.toEqual(data2)
+
+    const sig = (await signature.sign(keypair[0], data1)).expect("Should sign the message")
+    let verification = await signature.verify(keypair[1], data2, sig)
+
+    expect(verification).toBe(false)
+})
+
+test('different keypair', async () => {
+    const keypair = await signature.gen_keypair()
+    const keypair2 = await signature.gen_keypair()
+    let data = new TextEncoder().encode("Message 123 !")
+
+    const sig = (await signature.sign(keypair[0], data)).expect("Should sign the message")
+    let verification = await signature.verify(keypair2[1], data, sig)
+
+    expect(verification).toBe(false)
+})
+
+test('tampered signature', async () => {
+    let keypair = await signature.gen_keypair()
+    let data = new TextEncoder().encode("Message 123 !")
+
+    const sig = (await signature.sign(keypair[0], data)).expect("Should sign the message")
+    let verification = await signature.verify(keypair[1], data, sig.slice(0, -1))
+
+    expect(verification).toBe(false)
+})