+void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest) {
+ while (len--) {
+ dest[len] = n & 1;
+ n >>= 1;
+ }
+}
+
+// aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp
+// to
+// hh,gg,ff,ee,dd,cc,bb,aa, pp,oo,nn,mm,ll,kk,jj,ii
+// up to 64 bytes or 512 bits
+uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize){
+ static uint8_t buf[64];
+ memset(buf, 0x00, 64);
+ uint8_t *tmp = buf;
+ for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
+ for (size_t i = 0; i < blockSize; i++){
+ tmp[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
+ }
+ }
+ return tmp;
+}
+