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#include "../crypto.h"
#include <stdio.h>
#include <stdint.h>
uint8_t i_fletcher8(uint8_t *aa, size_t len){
uint8_t s1 = 0, s2 = 0;
for(int i = 0; i != len; i++){
s1 = (s1 + aa[i]) % 15;
s2 = (s2 + s1) % 15;
}
return (s2 << 4) | s1;
}
uint16_t i_fletcher16(uint8_t *aa, size_t len){
uint16_t s1 = 0, s2 = 0;
for(int i = 0; i != len; i++){
s1 = (s1 + aa[i]) % 255;
s2 = (s2 + s1) % 255;
}
return (s2 << 8) | s1;
}
uint32_t i_fletcher32(uint8_t *aa, size_t len){
uint32_t s1 = 0, s2 = 0;
for(int i = 0; i != len; i++){
s1 = (s1 + aa[i]) % 65535;
s2 = (s2 + s1) % 65535;
}
return (s2 << 16) | s1;
}
int l_fletcher32(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[32];
uint32_t u = i_fletcher32(a, len);
sprintf(digest,"%x",u);
lua_pushstring(L, digest);
return 1;
}
int l_fletcher16(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[16];
uint16_t u = i_fletcher16(a, len);
sprintf(digest,"%x",u);
lua_pushstring(L, digest);
return 1;
}
int l_fletcher8(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[8];
uint8_t u = i_fletcher8(a, len);
sprintf(digest,"%x",u);
lua_pushstring(L, digest);
return 1;
}
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