+// 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(uint8_t *src, size_t len){
+ static uint8_t temp[64]={0};
+ for (uint8_t block=0; block < (uint8_t)len/8; block++){
+ for (size_t i = 0; i < 8; i++){
+ temp[i+(8*block)] = src[(7-i)+(8*block)];
+ }
+ }
+ return temp;
+}
+