int outputLength = kwa.wrap(km, 0, km.length, wrapped, 0);
harness.check(outputLength == 16,
"Wrapped 64-bit key material MUST produce 16 bytes");
byte[] unwrapped = new byte[8];
outputLength = kwa.unwrap(wrapped, 0, wrapped.length, unwrapped, 0);
harness.check(outputLength == 8,
"Unwrapped 128-bit key material MUST produce 8 bytes");
harness.check(Arrays.equals(km, unwrapped),
"Unwrapped key material MUST match original value");
}