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node_modules/crypto-es/lib/pad-iso97971.js

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+import {
+  WordArray,
+} from './core.js';
+import {
+  ZeroPadding,
+} from './pad-zeropadding.js';
+
+/**
+ * ISO/IEC 9797-1 Padding Method 2.
+ */
+export const Iso97971 = {
+  pad(data, blockSize) {
+    // Add 0x80 byte
+    data.concat(WordArray.create([0x80000000], 1));
+
+    // Zero pad the rest
+    ZeroPadding.pad(data, blockSize);
+  },
+
+  unpad(data) {
+    const _data = data;
+
+    // Remove zero padding
+    ZeroPadding.unpad(_data);
+
+    // Remove one more byte -- the 0x80 byte
+    _data.sigBytes -= 1;
+  },
+};