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Uthash is an implementation of hash tables and linked lists for C structures by Troy D. Hanson. Uthash is licensed under the BSD revised license, see https://troydhanson.github.io/uthash/license.html,
The library uses an implementation of the Rijndael algorithm (AES) from OpenBSD by Vincent Rijmen, Antoon Bosselaers, and Paulo Barreto. The authors have placed the code in the public domain under the license included in the file rijndael.h (see http://www.openbsd.org/cgi-bin/cvsweb).
The SHA-256 implementation from Aaron D. Gifford is available at http://www.aarongifford.com/computers/sha2-1.0.1.tgz under a 3-clause BSD license.
The implementation of the ECC curve secp256r1 was originally developed by Chris K Cockrum and has been put under MIT license for inclusion with tinydtls. The original source is made available in https://cockrum.net/Implementation_of_ECC_on_an_8-bit_microcontroller.pdf