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ASP.NET Identity's default Password Hasher - How does it work and is it secure?
...6, 128-bit salt, 256-bit subkey, 10000 iterations.
* Format: { 0x01, prf (UInt32), iter count (UInt32), salt length (UInt32), salt, subkey }
* (All UInt32s are stored big-endian.)
*/
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imp...
What is the meaning of “POSIX”?
...sn't specified, but I know that at minimum Posix requires the existence of uint8_t, uint16_t, uint32_t and the corresponding signed types. I'm not sure if it guarantees that types like "int" have power-of-two sizes and that a system won't do something nasty like have an "int" with 32 value bits, 1 ...
node.js global variables?
...unction: ArrayBuffer],
Int8Array: { [Function] BYTES_PER_ELEMENT: 1 },
Uint8Array: { [Function] BYTES_PER_ELEMENT: 1 },
Int16Array: { [Function] BYTES_PER_ELEMENT: 2 },
Uint16Array: { [Function] BYTES_PER_ELEMENT: 2 },
Int32Array: { [Function] BYTES_PER_ELEMENT: 4 },
Uint32Array: { [Func...
Is gettimeofday() guaranteed to be of microsecond resolution?
...ons of detail.
#include <stdio.h>
#include <stdint.h>
inline uint64_t rdtsc() {
uint32_t lo, hi;
__asm__ __volatile__ (
"xorl %%eax, %%eax\n"
"cpuid\n"
"rdtsc\n"
: "=a" (lo), "=d" (hi)
:
: "%ebx", "%ecx");
return (uint64_t)hi << 32 ...
How do I shuffle an array in Swift?
...tartIndex ..< endIndex - 1 {
let j = Int(arc4random_uniform(UInt32(count - i))) + i
guard i != j else { continue }
swap(&self[i], &self[j])
}
}
}
extension CollectionType {
/// Return a copy of `self` with its elements shuffled.
fun...
Purpose of Unions in C and C++
...lity, then you can just use the struct and provide a setter that takes the uint32_t and sets the fields appropriately through bitmask operations. The same can be done in C with a function.
Edit: I was expecting AProgrammer to write down an answer to vote and close this one. As some comments have po...
When to use reinterpret_cast?
... function to achieve this:
/*constexpr*/ bool is_little_endian() {
std::uint16_t x=0x0001;
auto p = reinterpret_cast<std::uint8_t*>(&x);
return *p != 0;
}
Explanation: the binary representation of x in memory could be 0000'0000'0000'0001 (big) or 0000'0001'0000'0000 (little endian...
How to write log base(2) in c/c++
...could use a lookup table like in Bit Twiddling Hacks (integer log2 only).
uint32_t v; // find the log base 2 of 32-bit v
int r; // result goes here
static const int MultiplyDeBruijnBitPosition[32] =
{
0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
8, 12, 20, 28, 15, 17, 24, 7...
Detecting endianness programmatically in a C++ program
...ctly what unions are for !
bool is_big_endian(void)
{
union {
uint32_t i;
char c[4];
} bint = {0x01020304};
return bint.c[0] == 1;
}
The principle is equivalent to the type case as suggested by others, but this is clearer - and according to C99, is guaranteed to be c...
How to find the type of an object in Go?
...ssertions - allows grouping types, for example recognize all int32, int64, uint32, uint64 types as "int"
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