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node_modules/crypto-es/lib/pad-iso10126.js

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+import {
+  WordArray,
+} from './core.js';
+
+/**
+ * ISO 10126 padding strategy.
+ */
+export const Iso10126 = {
+  pad(data, blockSize) {
+    // Shortcut
+    const blockSizeBytes = blockSize * 4;
+
+    // Count padding bytes
+    const nPaddingBytes = blockSizeBytes - (data.sigBytes % blockSizeBytes);
+
+    // Pad
+    data
+      .concat(WordArray.random(nPaddingBytes - 1))
+      .concat(WordArray.create([nPaddingBytes << 24], 1));
+  },
+
+  unpad(data) {
+    const _data = data;
+    // Get number of padding bytes from last byte
+    const nPaddingBytes = _data.words[(_data.sigBytes - 1) >>> 2] & 0xff;
+
+    // Remove padding
+    _data.sigBytes -= nPaddingBytes;
+  },
+};