openssl command requires winpty on windows for OTA example (GIT8266O-556)

[ruthgrace]

On Windows, running these commands with mingw as per https://docs.espressif.com/projects/esp8266-rtos-sdk/en/latest/get-started/windows-setup.html , the openssl command must be run with winpty, or else it hangs. This is because openssl requires input from terminal.
See https://stackoverflow.com/questions/9450120/openssl-hangs-and-does-not-exit/45732888 and https://www.esp32.com/viewtopic.php?t=9521 .

When generating the ssl certificate and key, this command hangs:

ruthg@WINDOWS-T98KIEE MINGW32 ~/esp/ota/server
$ openssl req -x509 -newkey rsa:2048 -keyout ca_key.pem -out ca_cert.pem -days 365
Generating a RSA private key
...................................................+++++
..................................+++++

This command works:

ruthg@WINDOWS-T98KIEE MINGW32 ~/esp/ota/server
$ winpty openssl req -x509 -newkey rsa:2048 -keyout ca_key.pem -out ca_cert.pem -days 365
Generating a RSA private key
........................+++++
..........................................+++++
writing new private key to 'ca_key.pem'
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:California
Locality Name (eg, city) []:San-Francisco
Organization Name (eg, company) [Internet Widgits Pty Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (e.g. server FQDN or YOUR name) []:ruth
Email Address []:[email protected]
ruthg@WINDOWS-T98KIEE MINGW32 ~/esp/ota/server
$

When running the server, this command hangs:

ruthg@WINDOWS-T98KIEE MINGW32 ~/esp/ota/server
$ openssl s_server -WWW -key ca_key.pem -cert ca_cert.pem -port 8070

This command works:

ruthg@WINDOWS-T98KIEE MINGW32 ~/esp/ota/server
$ winpty openssl s_server -WWW -key ca_key.pem -cert ca_cert.pem -port 8070
Enter pass phrase for ca_key.pem:
Using default temp DH parameters
ACCEPT

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