[Error Compiling] read-only variables must be const. about cryptosuite

[beyondszine]

also, declare them const.

[raddevus]

Just confirming that I had same issues: In Sha256.cpp need to change so it looks like (partial snippets of each) : -- simply added const keyword to each.

uint32_t const sha256K[] PROGMEM = {
  0x428a2f98,0x71374491,0xb5c0fbcf,

and

uint8_t const sha256InitState[] PROGMEM = {
  0x67,0xe6,0x09,0x6a, // H0
  0x85,0xae,0x67,0xbb, // H1

After changing these -- along with a changing the return value of write() method, it all compiled in the Arduino IDE against a nano board with atmeg328.
Thanks,