make crypto lib injectable

Author: matthiasgeihs

src/index.ts

@@ -2,9 +2,9 @@ import { ec as EC } from "elliptic";
 
 const ec = new EC("secp256k1");
 // eslint-disable-next-line @typescript-eslint/no-explicit-any, n/no-unsupported-features/node-builtins
-const browserCrypto = globalThis.crypto || (globalThis as any).msCrypto || {};
+let browserCrypto = globalThis.crypto || (globalThis as any).msCrypto || {};
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const subtle = browserCrypto.subtle || (browserCrypto as any).webkitSubtle;
+let subtle = browserCrypto.subtle || (browserCrypto as any).webkitSubtle;
 
 const EC_GROUP_ORDER = Buffer.from("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", "hex");
 const ZERO32 = Buffer.alloc(32, 0);
@@ -16,6 +16,12 @@ export interface Ecies {
   mac: Buffer;
 }
 
+export function injectCryptoLib(cryptoLib: unknown) {
+  browserCrypto = cryptoLib;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  subtle = browserCrypto.subtle || (browserCrypto as any).webkitSubtle;
+}
+
 function assert(condition: boolean, message: string) {
   if (!condition) {
     throw new Error(message || "Assertion failed");