This program is written in C++11, can sign or verify files using Schnorr_Signature. Interactive mode(rather than passing arguement) is recommended, this can get full advantage of Schnorr algorithm , which is able to pre-generate keys. This program has one thread for key generating, and one another for signing or verifing.
openssl & GMP6.0
when installing gmp, cxx should be enabled, as below ./configure --enable-cxx
If your lib is installed under /usr/local/lib,
one possible way is to create etc/ld.so.conf.d/gmp.conf, add "/usr/local/lib" in it, then run ldconfig.
Edit MAXSAVEDKEY for the limit of pairs of key to genarate and put in the keyqueue for use. This program implements Hash using SHA-256, so set QLength = 256