Bump Hardcoded RSA Default in API (#9855)

Rectifies: https://github.com/certbot/certbot/security/advisories/GHSA-pcq2-mjvr-m4jj

certbot/certbot/_internal/tests/crypto_util_test.py

@@ -168,7 +168,7 @@ class MakeKeyTest(unittest.TestCase):
         from certbot.crypto_util import make_key
 
         # Do not test larger keys as it takes too long.
-        OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, make_key(1024))
+        OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, make_key(2048))
 
     def test_ec(self):  # pylint: disable=no-self-use
         # ECDSA Key Type Tests
@@ -185,8 +185,8 @@ class MakeKeyTest(unittest.TestCase):
         from certbot.crypto_util import make_key
 
         # Try a bad key size for RSA and ECDSA
-        with pytest.raises(errors.Error, match='Unsupported RSA key length: 512'):
-            make_key(bits=512, key_type='rsa')
+        with pytest.raises(errors.Error, match='Unsupported RSA key length: 1024'):
+            make_key(bits=1024, key_type='rsa')
 
     def test_bad_elliptic_curve_name(self):
         from certbot.crypto_util import make_key
@@ -200,7 +200,7 @@ class MakeKeyTest(unittest.TestCase):
         with pytest.raises(errors.Error,
                            match=re.escape('Invalid key_type specified: unf.  Use [rsa|ecdsa]')):
             OpenSSL.crypto.load_privatekey(
-                OpenSSL.crypto.FILETYPE_PEM, make_key(1024, key_type='unf'))
+                OpenSSL.crypto.FILETYPE_PEM, make_key(2048, key_type='unf'))
 
 
 class VerifyCertSetup(unittest.TestCase):

certbot/certbot/crypto_util.py

@@ -208,11 +208,11 @@ def import_csr_file(csrfile: str, data: bytes) -> Tuple[int, util.CSR, List[str]
     return PEM, util.CSR(file=csrfile, data=data_pem, form="pem"), domains
 
 
-def make_key(bits: int = 1024, key_type: str = "rsa",
+def make_key(bits: int = 2048, key_type: str = "rsa",
              elliptic_curve: Optional[str] = None) -> bytes:
     """Generate PEM encoded RSA|EC key.
 
-    :param int bits: Number of bits if key_type=rsa. At least 1024 for RSA.
+    :param int bits: Number of bits if key_type=rsa. At least 2048 for RSA.
     :param str key_type: The type of key to generate, but be rsa or ecdsa
     :param str elliptic_curve: The elliptic curve to use.
 
@@ -221,7 +221,7 @@ def make_key(bits: int = 1024, key_type: str = "rsa",
     :rtype: str
     """
     if key_type == 'rsa':
-        if bits < 1024:
+        if bits < 2048:
             raise errors.Error("Unsupported RSA key length: {}".format(bits))
 
         key = crypto.PKey()