fix grammar in error message (#5322)

alex · web-flow · commit 31359f36c067 · 2020-07-19T12:31:29.000-05:00
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -743,7 +743,7 @@ def _x509_check_signature_params(self, private_key, algorithm):
         elif not isinstance(private_key, (rsa.RSAPrivateKey, dsa.DSAPrivateKey,
                             ec.EllipticCurvePrivateKey)):
             raise TypeError(
-                "Key must be rsa, dsa, ec, ed25519 or ed448 private key."
+                "Key must be an rsa, dsa, ec, ed25519, or ed448 private key."
             )
         elif not isinstance(algorithm, hashes.HashAlgorithm):
             raise TypeError("Algorithm must be a registered hash algorithm.")

Original file line number	Diff line number	Diff line change
`@@ -743,7 +743,7 @@ def _x509_check_signature_params(self, private_key, algorithm):`
`743`	`743`	`elif not isinstance(private_key, (rsa.RSAPrivateKey, dsa.DSAPrivateKey,`
`744`	`744`	`ec.EllipticCurvePrivateKey)):`
`745`	`745`	`raise TypeError(`
`746`		`- "Key must be rsa, dsa, ec, ed25519 or ed448 private key."`
	`746`	`+ "Key must be an rsa, dsa, ec, ed25519, or ed448 private key."`
`747`	`747`	`)`
`748`	`748`	`elif not isinstance(algorithm, hashes.HashAlgorithm):`
`749`	`749`	`raise TypeError("Algorithm must be a registered hash algorithm.")`