openssl rsautl -decrypt -inkey private.pem -in data.2056bits.enc.bin -out data.128bits.dec.bin

opendssl rsa -in private.pem -pubout > pub.pem
openssl rsautl -encrypt -inkey pub.pem -pubin -in data.128bits.dec.bin -out data.2056bits.enc.bin

openssl rsautl -decrypt -inkey private.pem -in data.2056bits.enc.bin -out data.128bits.dec.bin