From 6edfd7d3410477aaf69059ad2c1a090c8327e069 Mon Sep 17 00:00:00 2001
From: 3c7 <Nils.Kuhnert@posteo.de>
Date: Wed, 12 Jul 2023 22:29:12 +0200
Subject: [PATCH] Added `hash_from_banner`

---
 hhhash/__init__.py |  2 +-
 hhhash/create.py   | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/hhhash/__init__.py b/hhhash/__init__.py
index 685d7a6..f08de11 100644
--- a/hhhash/__init__.py
+++ b/hhhash/__init__.py
@@ -1 +1 @@
-from hhhash.create import buildhash
+from hhhash.create import buildhash, hash_from_banner
diff --git a/hhhash/create.py b/hhhash/create.py
index 3e06899..faf5af8 100644
--- a/hhhash/create.py
+++ b/hhhash/create.py
@@ -15,3 +15,39 @@ def buildhash(url=None, debug=False):
     m.update(hhhash[1:].encode())
     digest = m.hexdigest()
     return f"hhh:1:{digest}"
+
+def hash_from_banner(banner, debug=False):
+    """This allows the creation of hhhash without a request, if the banner string is already available
+    
+    Example:
+        >>> hash_from_banner('''HTTP/1.1 200 OK
+        ... Content-Type: text/html; charset=ISO-8859-1
+        ... Content-Security-Policy-Report-Only: object-src 'none';base-uri 'self';script-src 'nonce-iV-j91UJEG2jNx4j6EeTug' 'strict-dynamic' 'report-sample' 'unsafe-eval' 'unsafe-inline' https: http:;report-uri https://csp.withgoogle.com/csp/gws/other-hp
+        ... P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info."
+        ... Date: Wed, 12 Jul 2023 20:23:42 GMT
+        ... Server: gws
+        ... X-XSS-Protection: 0
+        ... X-Frame-Options: SAMEORIGIN
+        ... Transfer-Encoding: chunked
+        ... Expires: Wed, 12 Jul 2023 20:23:42 GMT
+        ... Cache-Control: private
+        ... Set-Cookie: <removed>
+        ... Set-Cookie: <removed>
+        ... Set-Cookie: <removed>
+        ... Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000''')
+        hhh:1:d9576f3e7a381562f7d18a514ab095fa8699e96891d346d0042f83e942373215
+    """
+    hhhash = ""
+    for line in banner.splitlines():
+        if line[:4] == "HTTP":
+            continue
+        key = line
+        if ":" in key:
+            key, _ = line.split(":", maxsplit=1)
+        hhhash = f"{hhhash}:{key.strip()}"
+    if debug:
+        print(hhhash[1:])
+    m = hashlib.sha256()
+    m.update(hhhash[1:].encode())
+    digest = m.hexdigest()
+    return f"hhh:1:{digest}"