chore: custom crypto provider per singleton constructor

.gitignore

@@ -120,3 +120,4 @@ dist
 .idea
 .turbo
 coverage.json
+.DS_Store

packages/crypto/src/__tests__/crypto.spec.ts

@@ -22,13 +22,11 @@ class TestCryptoProvider implements CryptoProvider {
 
 describe('Crypto', () => {
     test('should use custom crypto provider', () => {
-        const crypto = Crypto.getInstance();
-        crypto.setCustomProvider(new TestCryptoProvider());
+        const crypto = Crypto.getInstance(new TestCryptoProvider());
         const testHash = crypto.provider.sha256(new Uint8Array([12, 23, 54, 46]));
         expect(testHash).toEqual(new Uint8Array([11, 12, 13, 14, 15]));
     });
     test('should use custom crypto provider', () => {
-        Crypto.getInstance().setCustomProvider(new TestCryptoProvider());
         const testHash = sha256AsBytes('foo', 'utf8');
         expect(testHash).toEqual(new Uint8Array([11, 12, 13, 14, 15]));
     });

packages/crypto/src/crypto/crypto.ts

@@ -16,10 +16,8 @@ import {WebCryptoProvider} from './webCryptoProvider';
 export class Crypto {
 
     private static instance: Crypto;
-    private cryptoProvider: CryptoProvider;
 
-    private constructor() {
-        this.cryptoProvider = Crypto.isNode() ? new NodeJSCryptoProvider() : new WebCryptoProvider();
+    private constructor(private cryptoProvider: CryptoProvider) {
     }
 
     /**
@@ -32,10 +30,12 @@ export class Crypto {
 
     /**
      * Singleton instance accessor
+     * @param customProvider The implementation of a CryptoProvider for non-Web or NodeJS environments
      */
-    static getInstance(): Crypto {
+    static getInstance(customProvider?: CryptoProvider): Crypto {
         if (!Crypto.instance) {
-            Crypto.instance = new Crypto();
+            const provider = !customProvider ? Crypto.isNode() ? new NodeJSCryptoProvider() : new WebCryptoProvider() : customProvider;
+            Crypto.instance = new Crypto(provider);
         }
         return Crypto.instance;
     }
@@ -47,13 +47,5 @@ export class Crypto {
         return typeof process !== 'undefined' && process.versions != null && process.versions.node != null;
     }
 
-    /**
-     * Allows to set a custom crypto provider.
-     * This may be useful/necessary when using non-NodeJs or non-Web environments, e.g. React Native
-     * @param customProvider The implementation of a CryptoProvider
-     */
-    setCustomProvider(customProvider: CryptoProvider): void {
-        this.cryptoProvider = customProvider;
-    }
 }