From d98711cb51d13bb2da3682014c7c6e75d7fbb4f0 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Fri, 23 Dec 2022 12:58:26 +0100
Subject: use native KDF / hash state if available

---
 packages/taler-util/src/kdf.ts | 40 ----------------------------------------
 1 file changed, 40 deletions(-)

(limited to 'packages/taler-util/src/kdf.ts')

diff --git a/packages/taler-util/src/kdf.ts b/packages/taler-util/src/kdf.ts
index dd8a2a459..8f4314340 100644
--- a/packages/taler-util/src/kdf.ts
+++ b/packages/taler-util/src/kdf.ts
@@ -16,7 +16,6 @@
 
 import * as nacl from "./nacl-fast.js";
 import { sha256 } from "./sha256.js";
-import { useNative } from "./taler-crypto.js";
 
 export function sha512(data: Uint8Array): Uint8Array {
   return nacl.hash(data);
@@ -59,42 +58,3 @@ export function hmacSha512(key: Uint8Array, message: Uint8Array): Uint8Array {
 export function hmacSha256(key: Uint8Array, message: Uint8Array): Uint8Array {
   return hmac(sha256, 64, key, message);
 }
-
-export function kdf(
-  outputLength: number,
-  ikm: Uint8Array,
-  salt?: Uint8Array,
-  info?: Uint8Array,
-): Uint8Array {
-  if (useNative && "_kdf" in globalThis) {
-    // @ts-ignore
-    return globalThis._kdf(outputLength, ikm, salt, info);
-  }
-  salt = salt ?? new Uint8Array(64);
-  // extract
-  const prk = hmacSha512(salt, ikm);
-
-  info = info ?? new Uint8Array(0);
-
-  // expand
-  const N = Math.ceil(outputLength / 32);
-  const output = new Uint8Array(N * 32);
-  for (let i = 0; i < N; i++) {
-    let buf;
-    if (i == 0) {
-      buf = new Uint8Array(info.byteLength + 1);
-      buf.set(info, 0);
-    } else {
-      buf = new Uint8Array(info.byteLength + 1 + 32);
-      for (let j = 0; j < 32; j++) {
-        buf[j] = output[(i - 1) * 32 + j];
-      }
-      buf.set(info, 32);
-    }
-    buf[buf.length - 1] = i + 1;
-    const chunk = hmacSha256(prk, buf);
-    output.set(chunk, i * 32);
-  }
-
-  return output.slice(0, outputLength);
-}
-- 
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