bpo-32602: Test ECDSA certs (#5247)

Add test certs and test for ECDSA cert and EC/RSA dual mode.

I'm also adding certs for IDNA 2003/2008 tests and simplify some test
data handling.

Signed-off-by: Christian Heimes <christian@python.org>

1 files changed, 58 insertions, 31 deletions

diff --git a/Lib/test/allsans.pem b/Lib/test/allsans.pem
index 3ee4f59513..bf59f30aba 100644
--- a/Lib/test/allsans.pem
+++ b/Lib/test/allsans.pem
@@ -1,37 +1,64 @@
 -----BEGIN PRIVATE KEY-----
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 -----END PRIVATE KEY-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----