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diff --git a/test/testdata/certificate/instructions.md b/test/testdata/certificate/instructions.md
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+# Generate certificates for client cert tests
+
+## CA
+```sh
+openssl ecparam -name prime256v1 -genkey -noout -out ca.key
+openssl req -new -x509 -sha256 -days 6027 -key ca.key -out ca.crt -subj "/CN=ytdlptest"
+```
+
+## Client
+```sh
+openssl ecparam -name prime256v1 -genkey -noout -out client.key
+openssl ec -in client.key -out clientencrypted.key -passout pass:foobar -aes256
+openssl req -new -sha256 -key client.key -out client.csr -subj "/CN=ytdlptest2"
+openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 6027 -sha256
+cp client.crt clientwithkey.crt
+cp client.crt clientwithencryptedkey.crt
+cat client.key >> clientwithkey.crt
+cat clientencrypted.key >> clientwithencryptedkey.crt
+```
+\ No newline at end of file