OpenSoure_Repos/TheAlgorithms-C-Plus-Plus
1
0
Fork 0
mirror of https://hub.njuu.cf/TheAlgorithms/C-Plus-Plus.git synced 2023-10-11 13:05:55 +08:00
Code Issues Packages Projects Releases Wiki Activity

Feat: Elliptic Curve Diffie Hellman Key Exchange, Ciphers: Error handling-bit handling

Browse Source
This commit is contained in:
Ashish Bhanu Daulatabad 2021-04-10 22:37:59 +05:30
parent 8f207ffdcf
commit c6d0db0c9d
1 changed files with 29 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
ciphers/uint128_t.hpp
View File

@ -12,6 +12,10 @@
#include <string>
#include <utility>
#ifdef _MSC_VER
#include <intrin.h>
#endif
#ifndef CIPHERS_UINT128_T_HPP_
#define CIPHERS_UINT128_T_HPP_
class uint128_t;
@ -127,9 +131,20 @@ class uint128_t {
* @returns Integer denoting leading zeroes
*/
inline uint32_t _lez() {
#ifndef _MSC_VER
if (f)
return __builtin_clzll(f);
return 64 + __builtin_clzll(s);
#else
uint32_t r = 0;
_BitScanForward64(&r, f);
if (r == 64) {
uint32_t l = 0;
_BitScanForward64(&l, s);
return 64 + l;
}
return r;
#endif
}
/**
@ -138,9 +153,20 @@ class uint128_t {
* @returns Integer denoting Trailing zeroes
*/
inline uint32_t _trz() {
if (s)
return __builtin_ctzll(s);
return 64 + __builtin_ctzll(f);
#ifndef _MSC_VER
if (f)
return __builtin_ctzll(f);
return 64 + __builtin_ctzll(s);
#else
uint32_t r = 0;
_BitScanReverse64(&r, s);
if (r == 64) {
uint32_t l = 0;
_BitScanReverse64(&l, f);
return 64 + l;
}
return r;
#endif
}
inline uint32_t _len() { return _lez(); }