Obtain the ssl certificate from a given url and generate the fingerprint for it (SHA1 and SHA256)

cert.py

from M2Crypto import X509
import ssl


def colon(s):
    return ':'.join(s[i:i+2] for i in range(0, len(s), 2))

addr = ("www.example.com", 443)
cert_pem = ssl.get_server_certificate(addr)
x509 = X509.load_cert_string(str(cert_pem), X509.FORMAT_PEM)

sha1_fingerprint = x509.get_fingerprint('sha1')
sha256_fingerprint = x509.get_fingerprint('sha256')

print("Address: {}:{}\nSHA1: {}\nSHA256: {}".format(
    addr[0], addr[1],
    colon(sha1_fingerprint),
    colon(sha256_fingerprint))
)

Some notes:

• M2Crypto is not yet python 3.x compatible
• Installing M2Crypto on mac, you might want to read http://stackoverflow.com/a/33125400