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pqcrypto/crypto_kem/sntrup857/clean/crypto_decode_857x3.c
2021-03-24 21:02:47 +00:00

25 lines
510 B
C

#include "crypto_decode_857x3.h"
#define uint8 uint8_t
#define p 857
void PQCLEAN_SNTRUP857_CLEAN_crypto_decode_857x3(void *v, const unsigned char *s) {
uint8 *f = v;
uint8 x;
int i;
for (i = 0; i < p / 4; ++i) {
x = *s++;
*f++ = (uint8) ((x & 3) - 1);
x >>= 2;
*f++ = (uint8) ((x & 3) - 1);
x >>= 2;
*f++ = (uint8) ((x & 3) - 1);
x >>= 2;
*f++ = (uint8) ((x & 3) - 1);
}
x = *s++;
*f++ = (uint8) ((x & 3) - 1);
}