a #GChecksumType to use for the HMAC
the key to use in the HMAC
the string to compute the HMAC for
the length of the string, or -1 if the string is nul-terminated
Return: the HMAC as a hexadecimal string. The returned string should be freed with g_free() when done using it.
2.30
Computes the HMAC for a string.
The hexadecimal string returned will be in lower case.