Improve CMS/Kerberos support of other hashes (#4974)

Author: gpotter2

scapy/asn1/mib.py

@@ -807,6 +807,7 @@ def load_mib(filenames):
 # of some algorithms from pkcs1_oids and x962Signature_oids.
 
 hash_by_oid = {
+    "1.2.840.113549.1.1.1": "sha1",
     "1.2.840.113549.1.1.2": "md2",
     "1.2.840.113549.1.1.3": "md4",
     "1.2.840.113549.1.1.4": "md5",

scapy/layers/gssapi.py

@@ -342,7 +342,7 @@ def fromssl(
                 log_runtime.warning("Failed to parse the SSL Certificate. CBT not used")
                 return GSS_C_NO_CHANNEL_BINDINGS
             try:
-                h = cert.getSignatureHash()
+                h = cert.getCertSignatureHash()
             except Exception:
                 # We failed to get the signature algorithm.
                 log_runtime.warning(