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README.md: add some details and references. #234

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27 changes: 23 additions & 4 deletions README.md
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# About tinydtls

tinydtls is a library for Datagram Transport Layer Security (DTLS)
covering both the client and the server state machine. It is
implemented in C and provides support for a minimal set of cipher
suites suitable for the Internet of Things.
tinydtls is a library for Datagram Transport Layer Security (DTLS 1.2
[RFC 6347](https://www.rfc-editor.org/rfc/rfc6347)) covering both the client
and the server state machine. It is implemented in C and provides support
for a minimal set of cipher suites suitable for the Internet of Things.

This library contains functions and structures that can help
constructing a single-threaded UDP server with DTLS support in
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mv libtinydtls.so libtinydtls.dll # Apply Windows file extension
```

# Implemented Cipher Suites

| Name | ID | RFC |
| ------ | ----------- | ------- |
| TLS_PSK_WITH_AES_128_CCM | 0xC0A4 | [RFC 6655](https://www.rfc-editor.org/rfc/rfc6655) |
| TLS_PSK_WITH_AES_128_CCM_8 | 0xC0A8 | [RFC 6655](https://www.rfc-editor.org/rfc/rfc6655) |
| TLS_ECDHE_ECDSA_WITH_AES_128_CCM | 0xC0AC | [RFC 7251](https://www.rfc-editor.org/rfc/rfc7251) |
| TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 | 0xC0AE | [RFC 7251](https://www.rfc-editor.org/rfc/rfc7251) |

# Supported TLS Extensions

| Name | RFC |
| ------ | ------- |
| Pre Shared Key (PSK) | [RFC 4279](https://www.rfc-editor.org/rfc/rfc4279) |
| TLS Renegotiation Indication (minimal version) | [RFC 5746](https://www.rfc-editor.org/rfc/rfc5746) |
| Raw Public Key (RPK) | [RFC 7250](https://www.rfc-editor.org/rfc/rfc7250) |
| Extended Master Secret | [RFC 7627](https://www.rfc-editor.org/rfc/rfc7627) |
| DTLS 1.2 Connection ID (client only, feature branch) | [RFC 9146](https://www.rfc-editor.org/rfc/rfc9146) |

# License

Copyright (c) 2011–2022 Olaf Bergmann (TZI) and others.
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