Do not require padding on schema

packages/wallet-connectors/CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 -   Fixed serialization of parameters in `requestVerifiablePresentation` and parsing of the result of the request.
 
+### Changed
+
+-   `schemaAsBuffer` and thereby `typeSchemaFromBase64` no longer requires a base64 encoded schema to be padded.
+
 ## [0.5.0] - 2024-03-13
 
 ### Added

packages/wallet-connectors/src/WalletConnection.ts

@@ -69,11 +69,17 @@ export function typeSchema(schema: Buffer): TypeSchema {
     };
 }
 
-function schemaAsBuffer(schemaBase64: string) {
+export function schemaAsBuffer(schemaBase64: string) {
+    let unpaddedLen = schemaBase64.length;
+    if (schemaBase64.charAt(unpaddedLen - 1) === '=') {
+        unpaddedLen--;
+    }
+    if (schemaBase64.charAt(unpaddedLen - 1) === '=') {
+        unpaddedLen--;
+    }
     const res = toBuffer(schemaBase64, 'base64');
-    // Check round-trip. This requires the provided schema to be properly padded.
-    if (res.toString('base64') !== schemaBase64) {
-        throw new Error(`provided schema '${schemaBase64}' is not valid base64`);
+    if (unpaddedLen !== Math.ceil((4 * res.length) / 3)) {
+        throw new Error(`The provided schema '${schemaBase64}' is not valid base64`);
     }
     return res;
 }