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node_modules/crypto-es/lib/pad-zeropadding.js

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+/**
+ * Zero padding strategy.
+ */
+export const ZeroPadding = {
+  pad(data, blockSize) {
+    const _data = data;
+
+    // Shortcut
+    const blockSizeBytes = blockSize * 4;
+
+    // Pad
+    _data.clamp();
+    _data.sigBytes += blockSizeBytes - ((data.sigBytes % blockSizeBytes) || blockSizeBytes);
+  },
+
+  unpad(data) {
+    const _data = data;
+
+    // Shortcut
+    const dataWords = _data.words;
+
+    // Unpad
+    for (let i = _data.sigBytes - 1; i >= 0; i -= 1) {
+      if (((dataWords[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff)) {
+        _data.sigBytes = i + 1;
+        break;
+      }
+    }
+  },
+};