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

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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
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32
ciphers/uint128_t.hpp
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@ -12,6 +12,10 @@
#include <string> #include <string>
#include <utility> #include <utility>
#ifdef _MSC_VER
#include <intrin.h>
#endif
#ifndef CIPHERS_UINT128_T_HPP_ #ifndef CIPHERS_UINT128_T_HPP_
#define CIPHERS_UINT128_T_HPP_ #define CIPHERS_UINT128_T_HPP_
class uint128_t; class uint128_t;
@ -127,9 +131,20 @@ class uint128_t {
* @returns Integer denoting leading zeroes * @returns Integer denoting leading zeroes
*/ */
inline uint32_t _lez() { inline uint32_t _lez() {
#ifndef _MSC_VER
if (f) if (f)
return __builtin_clzll(f); return __builtin_clzll(f);
return 64 + __builtin_clzll(s); 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 * @returns Integer denoting Trailing zeroes
*/ */
inline uint32_t _trz() { inline uint32_t _trz() {
if (s) #ifndef _MSC_VER
return __builtin_ctzll(s); if (f)
return 64 + __builtin_ctzll(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(); } inline uint32_t _len() { return _lez(); }