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node_modules/crypto-es/lib/pad-ansix923.js

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+/**
+ * ANSI X.923 padding strategy.
+ */
+export const AnsiX923 = {
+  pad(data, blockSize) {
+    const _data = data;
+
+    // Shortcuts
+    const dataSigBytes = _data.sigBytes;
+    const blockSizeBytes = blockSize * 4;
+
+    // Count padding bytes
+    const nPaddingBytes = blockSizeBytes - (dataSigBytes % blockSizeBytes);
+
+    // Compute last byte position
+    const lastBytePos = dataSigBytes + nPaddingBytes - 1;
+
+    // Pad
+    _data.clamp();
+    _data.words[lastBytePos >>> 2] |= nPaddingBytes << (24 - (lastBytePos % 4) * 8);
+    _data.sigBytes += nPaddingBytes;
+  },
+
+  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;
+  },
+};