Increase memory size if necessary sha256.js

sha256.js

@@ -1,10 +1,19 @@
 const fileUrl = import.meta.url.replace(/\.js$/, '.wasm');
 const sha256_wasm = await (await fetch(fileUrl)).arrayBuffer()
+
 const sha256_wasm_exports = (await WebAssembly.instantiate(sha256_wasm)).instance.exports
+const memory = sha256_wasm_exports.memory
+const bytesPerPage = 64 * 1024
 
 export function sha256(data) {
-	const wasm_data = new Uint8Array(sha256_wasm_exports.memory.buffer, 0, data.length)
-	const wasm_hash = new Uint8Array(sha256_wasm_exports.memory.buffer, data.length, 32)
+	// Increase the size of the wasm memory if necessary
+	if(data.length > memory.buffer.byteLength){
+		const pages = Math.floor((data.length - memory.buffer.byteLength) / bytesPerPage ) + 1
+		memory.grow(pages)
+	}
+
+	const wasm_data = new Uint8Array(memory.buffer, 0, data.length)
+	const wasm_hash = new Uint8Array(memory.buffer, data.length, 32)
 	wasm_data.set(data)
 	sha256_wasm_exports.SHA256(wasm_data.byteOffset, wasm_hash.byteOffset);
 	return wasm_hash.slice(0, 32)