Add a benchmark of loading a certificate (#7551)

tests/bench/test_x509.py

@@ -3,8 +3,12 @@
 # 2.0, and the BSD License. See the LICENSE file in the root of this repository
 # for complete details.
 
+import os
+
 from cryptography import x509
 
+from ..utils import load_vectors_from_file
+
 
 def test_object_identier_constructor(benchmark):
     benchmark(x509.ObjectIdentifier, "1.3.6.1.4.1.11129.2.4.5")
@@ -17,3 +21,13 @@ def test_aki_public_bytes(benchmark):
         authority_cert_serial_number=None,
     )
     benchmark(aki.public_bytes)
+
+
+def test_load_pem_certificate(benchmark):
+    cert_bytes = load_vectors_from_file(
+        os.path.join("x509", "cryptography.io.pem"),
+        loader=lambda pemfile: pemfile.read(),
+        mode="rb",
+    )
+
+    benchmark(x509.load_pem_x509_certificate, cert_bytes)