Commit 418c25a7 authored by Niels Möller's avatar Niels Möller

* shadata.c: New file, for generating SHA-256 constants.

Rev: src/nettle/shadata.c:1.1
parent e0c32627
#include <math.h>
#include <stdio.h>
static const unsigned primes[64] =
{
2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
73, 79, 83, 89, 97, 101, 103, 107, 109, 113,
127, 131, 137, 139, 149, 151, 157, 163, 167, 173,
179, 181, 191, 193, 197, 199, 211, 223, 227, 229,
233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
283, 293, 307, 311
};
int main(int argc, char **argv)
{
int i;
static const double third = 1.0/3;
printf("SHA-256 constants: \n");
for (i = 0; i < 64; )
{
double root = pow(primes[i++], third);
double fraction = root - (floor(root));
double value = floor(ldexp(fraction, 32));
printf("0x%lxUL, ", (unsigned long) value);
if (!(i % 4))
printf("\n");
}
printf("\nSHA-256 initial values: \n");
for (i = 0; i < 8; )
{
double root = pow(primes[i++], 0.5);
double fraction = root - (floor(root));
double value = floor(ldexp(fraction, 32));
printf("0x%lxUL, ", (unsigned long) value);
if (!(i % 4))
printf("\n");
}
return 0;
}
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