To build ctool
cd src
make
Create certificate files for demo.
./m1
Sign certificate A with B and save as C. (Bash scripts sign and check invoke ctool.)
./sign
Check that certificate C is signed by B.
./check
Print certificate keys.
./ctool key key.pem
Supported public key algorithms
RSA
prime256v1 (NIST P-256)
secp384r1 (NIST P-384)
Supported hash algorithms
MD5
SHA1
SHA224
SHA256
SHA384
SHA512