Operation request: Sign/Verify with ECDSA

[cplussharp]

Summary

Similar to RSA, support "Sign with ECDSA" and "Verfiy with ECDSA"

Example Input

the needed key for the operation (sign=>private key | verify => public key) as PEM
the hash operation (SHA256, SHA384, SHA512)

for sign the message is the input
for verify the signature is the input (and the message is provided as option)

Example Output

for sign: the signature
for verify: the verification result