| #!/bin/bash | |
| # Sign a file with a private key using OpenSSL | |
| # Encode the signature in Base64 format | |
| # | |
| # Usage: sign <file> <private_key> | |
| # | |
| # NOTE: to generate a public/private key use the following commands: | |
| # | |
| # openssl genrsa -aes128 -passout pass:<passphrase> -out private.pem 2048 | |
| # openssl rsa -in private.pem -passin pass:<passphrase> -pubout -out public.pem |
Inspired by this article. Neat tricks for speeding up integer computations.
Note: cin.sync_with_stdio(false); disables synchronous IO and gives you a performance boost.
If used, you should only use cin for reading input
(don't use both cin and scanf when sync is disabled, for example)
or you will get unexpected results.
x = x << 1; // x = x * 2
