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See the README and INSTALL files in the package for instructions on how to use and how to install the ec-keygen, ec-sign, ec-verify, ec-crypt and ec-decrypt commands.

List nicknames of curves:

ec-keygen -l
c47n23r1:secp112r1:secp112r2:secp160r1:secp384r1:sect113r1:sect163k1

Generate a public and private key:

ec-keygen -e secp112r2 -o stes

Generated files:

ls -ltr stes.pub stes.prv
-rw-r--r--    1 stes     users         311 Jul 12 22:00 stes.pub
-rw-------    1 stes     users         135 Jul 12 22:00 stes.prv

Digital Signature:

ec-sign -c sha1 -k stes.prv -f README -s README.sign

Verify the signature:

ec-verify -k stes.pub -f README -s README.sign
echo $? 
0

Encrypt:

ec-crypt -c aes-128-cbc -k stes.pub -f README -s README.key -o enc
ec-crypt: unable to get 16 bytes of key from this curve, use a different curve
ec-crypt -c rc4-40 -k stes.pub -f README -s README.key -o enc

Decrypt:

ec-decrypt -k stes.prv -f enc -s README.key -o myREADME

A unique feature of this implementation is the possibility of using a few curves over finite fields with prime fields of odd characteristic (in this case, a finite field of characteristic 47 (a small prime))