SHA1 / SHA256 and HMAC-SHA1 / HMAC-SHA256 Hash library
SHA1 / SHA256 and HMAC-SHA1 / HMACSHA256 Hash library
hmacsha256test.cpp

For Rasberry pi
Updated: spaniakos 2015

This is an example of how to use HMAC-SHA256 of this SHA library.
The text and keys can be either in HEX or String format.
The examples are from the RFC4231

to use String key it must be in the form of : uint8_t hmacKey2= (unsigned char)"0123456789:;<=>?@ABC";