sslscan does not support dual certificate servers

[tetlowgm]

Servers can run with ECDSA and RSA certificates concurrently, but the certificate information only shows one.

An example of this:

$ sslscan google.com
...
  SSL Certificate:
Signature Algorithm: ecdsa-with-SHA256
ECC Curve Name:      prime256v1
ECC Key Strength:    128
...
Issuer:   WE2

This can be verified by hand with OpenSSL:

$ openssl s_client -connect google.com:443
...
subject=CN=*.google.com
issuer=C=US, O=Google Trust Services, CN=WE2
...
Peer signature type: ECDSA
...
Server public key is 256 bit
...

However, the server also supports RSA certificates:

$ openssl s_client -sigalgs "RSA-PSS+SHA512:RSA-PSS+SHA384:RSA-PSS+SHA256" -connect google.com:443
...
subject=CN=*.google.com
issuer=C=US, O=Google Trust Services, CN=WR2
...
Peer signature type: RSA-PSS
...
Server public key is 2048 bit
...

It would be nice if sslscan understood this and output information on both certificates.

[tetlowgm]

Duplicate of #208