sign    verify    sign/s verify/s
rsa  512 bits 0.005059s 0.000441s    197.7   2267.6
rsa 1024 bits 0.023690s 0.001112s     42.2    899.3
rsa 2048 bits 0.130403s 0.003371s      7.7    296.6
rsa 4096 bits 0.815769s 0.011288s      1.2     88.6