Updated LICENSE and README.md file

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,

   this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,

# TS 103 744 Quantum-safe Hybrid Key Exchanges

## TS 103 744 Quantum-safe Hybrid Key Exchanges ##

 Informative reference implementation as reported in Annex C of ETSI TS 103 744,

 "CYBER; Quantum-safe Hybrid Key Exchanges. The code is not intended for production use.

 It is intended to be a reference implementation for test.

## License

 More information and standards download at the [work item page](https://portal.etsi.org/webapp/WorkProgram/Report_WorkItem.asp?WKI_ID=56659). 

 ### Usage ###

 This code is provided as an informative implementation of the Quantum-safe Hybrid Key Exchanges for the Concatenate 

 KDF (CatKDF) and Cascade KDF (CasKDF).  It generates the test vectors contained in the TS.

 This is not intended for production use.  It is intended to be a reference

 implementation for test vectors for the specification.

 ### Build instructions ###

This library requires OpenSSL version 1.1.1d libcrypto.

     gcc -Wall -o etsi-hkex-test main.c qshkex.c -lcrypto

     ./etsi-hkex-test

### License ###     

The content of this repository and the files

contained are released under the BSD-3-Clause license.

See the attached LICENSE file or visit https://forge.etsi.org/legal-matters.

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