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Added Simple SSL Echo Client/Server to demos.
Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from openssl#17260)
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Useful Links: | ||
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OpenSSL API Documentation: https://www.openssl.org/docs | ||
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Github: https://github.com/openssl/openssl | ||
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OpenSSL Wiki: https://wiki.openssl.org/index.php/Main_Page | ||
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Original Simple Server: https://wiki.openssl.org/index.php/Simple_TLS_Server | ||
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--------------------------------------------------------------- | ||
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Generate self signed cert and key 'pem' files (good for 10 years): | ||
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openssl req -newkey rsa:4096 -x509 -sha256 -days 3650 -nodes -out cert.pem -keyout key.pem | ||
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You can just hit carriage returns to accept the default values, except for "Common Name"; you | ||
should enter 'localhost', or an actual hostname. | ||
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The same keys can be used for both communicating instances; same or different machines. |
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OpenSSL Simple Echo Client/Server | ||
================================= | ||
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This project implements a simple echo client/server. | ||
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It is a console application, with command line parameters determining the mode | ||
of operation (client or server). Start it with no parameters to see usage. | ||
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The server code was adapted from the Simple TLS Server on the OpenSSL Wiki. | ||
The server code was modified to perform the echo function, and client code | ||
was added to open a connection with the server and to send keyboard input | ||
to the server. | ||
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The new client code illustrates that: | ||
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- Connection to the SSL server starts as a standard TCP 'connect'. | ||
- Once connected with TCP, the client 'upgrades' to SSL using | ||
SSL_connect(). | ||
- When the SSL connection completes, data is sent and received using | ||
SSL_write() and SSL_read(). | ||
- Pretty simple. | ||
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The cert.pem and key.pem files included are self signed certificates with the | ||
"Common Name" of 'localhost'. | ||
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Best to create the 'pem' files using an actual hostname. |
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-----BEGIN CERTIFICATE----- | ||
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-----END CERTIFICATE----- |
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-----BEGIN PRIVATE KEY----- | ||
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-----END PRIVATE KEY----- |
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