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/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* Convert a hexadecimal hashsum (both lower case, upper
* case and mixed is supported) to binary representation
*
* @param output Output array, should have an allocation size of at least `strlen(hashsum) / 2`
* @param hashsum The hashsum to convert
*/
void
libkeccak_unhex(void *restrict output_, const char *restrict hashsum)
{
unsigned char *restrict output = output_;
size_t n = strlen(hashsum) / 2;
unsigned char a, b;
while (n--) {
a = (unsigned char)hashsum[2 * n + 0];
b = (unsigned char)hashsum[2 * n + 1];
a = (unsigned char)((a & 15) + (a > '9' ? 9 : 0));
b = (unsigned char)((b & 15) + (b > '9' ? 9 : 0));
a = (unsigned char)(a << 4);
a |= b;
output[n] = a;
}
}
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