From 0bbaafcd36ce68f95faee0b91738a169848c7a90 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Thu, 7 Oct 2021 15:09:40 +0200
Subject: anastasis: implement user id derivation

---
 packages/anastasis-core/src/crypto.ts | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'packages/anastasis-core/src/crypto.ts')

diff --git a/packages/anastasis-core/src/crypto.ts b/packages/anastasis-core/src/crypto.ts
index 54f27b646..c20d323a7 100644
--- a/packages/anastasis-core/src/crypto.ts
+++ b/packages/anastasis-core/src/crypto.ts
@@ -1,10 +1,27 @@
+import {
+  canonicalJson,
+  decodeCrock,
+  encodeCrock,
+  stringToBytes,
+} from "@gnu-taler/taler-util";
 import { argon2id } from "hash-wasm";
 
-async function userIdentifierDerive(
+export async function userIdentifierDerive(
   idData: any,
   serverSalt: string,
 ): Promise<string> {
-  throw Error("not implemented");
+  const canonIdData = canonicalJson(idData);
+  const hashInput = stringToBytes(canonIdData);
+  const result = await argon2id({
+    hashLength: 64,
+    iterations: 3,
+    memorySize: 1024 /* kibibytes */,
+    parallelism: 1,
+    password: hashInput,
+    salt: decodeCrock(serverSalt),
+    outputType: "binary",
+  });
+  return encodeCrock(result);
 }
 
 // interface Keypair {
-- 
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