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Do not violate strict aliasing in int128_aes128ctr.c

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This commit is contained in:
Frank Denis 2014-05-20 19:41:43 -07:00
parent 7da592b730
commit 5f847cb76c
1 changed files with 12 additions and 12 deletions
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24
src/libsodium/crypto_stream/aes128ctr/portable/int128_aes128ctr.c
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@ -1,3 +1,6 @@
#include <string.h>
#include "int128.h"
#include "common.h"
@ -27,13 +30,11 @@ void copy2(int128 *r, const int128 *x)
void shufb(int128 *r, const unsigned char *l)
{
int128 t;
unsigned char ct[16];
unsigned char *cr;
unsigned char *ct;
copy2(&t,r);
memcpy(ct, r, 16);
cr = (unsigned char *)r;
ct = (unsigned char *)&t;
cr[0] = ct[l[0]];
cr[1] = ct[l[1]];
cr[2] = ct[l[2]];
@ -54,14 +55,13 @@ void shufb(int128 *r, const unsigned char *l)
void shufd(int128 *r, const int128 *x, const unsigned int c)
{
int128 t;
uint32 *tp = (uint32 *)&t;
const uint32 *xp = (const uint32 *)x;
tp[0] = xp[c&3];
tp[1] = xp[(c>>2)&3];
tp[2] = xp[(c>>4)&3];
tp[3] = xp[(c>>6)&3];
copy2(r,&t);
unsigned char tp[16];
const unsigned char *xp = (const unsigned char *) x;
memcpy(tp + 0, xp + (c >> 0 & 3) * 4, 4);
memcpy(tp + 4, xp + (c >> 2 & 3) * 4, 4);
memcpy(tp + 8, xp + (c >> 4 & 3) * 4, 4);
memcpy(tp + 12, xp + (c >> 6 & 3) * 4, 4);
memcpy(r, tp, 16);
}
void rshift32_littleendian(int128 *r, const unsigned int n)