updated IS codes

IS/Lab/Lab5/hashbench.py

@@ -1,10 +1,55 @@
 import hashlib
+import random
+import string
+import time
 
 def ds_gen(dsize):
+    """Generate random strings dataset"""
+    dataset = []
+    for _ in range(dsize):
+        length = random.randint(10, 50)
+        random_string = ''.join(random.choices(string.ascii_letters + string.digits, k=length))
+        dataset.append(random_string)
+    return dataset
 
+def hash_benchmark(dataset, hash_func, hash_name):
+    """Benchmark hashing function and detect collisions"""
+    start_time = time.time()
+    hashes = {}
+    collisions = []
+    
+    for data in dataset:
+        hash_value = hash_func(data.encode()).hexdigest()
+        if hash_value in hashes:
+            collisions.append((data, hashes[hash_value]))
+        else:
+            hashes[hash_value] = data
+    
+    end_time = time.time()
+    return end_time - start_time, len(collisions), collisions
 
 def main():
-    dsize = int(input("Enter data size: "))
+    dsize = int(input("Enter data size (50-100): "))
+    dsize = max(50, min(100, dsize))  # Ensure range 50-100
+    
+    dataset = ds_gen(dsize)
+    
+    hash_functions = [
+        (hashlib.md5, "MD5"),
+        (hashlib.sha1, "SHA-1"), 
+        (hashlib.sha256, "SHA-256")
+    ]
+    
+    print(f"Testing with {len(dataset)} strings\n")
+    
+    for hash_func, name in hash_functions:
+        time_taken, collision_count, collisions = hash_benchmark(dataset, hash_func, name)
+        print(f"{name}:")
+        print(f"  Time: {time_taken:.6f} seconds")
+        print(f"  Collisions: {collision_count}")
+        if collisions:
+            print(f"  Collision pairs: {collisions[:3]}")  # Show first 3
+        print()
 
 if __name__ == '__main__':
     main()