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Enforce round-to-nearest.

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Frank Denis 2013-04-17 23:50:25 +02:00
parent b282b45dc7
commit b64beede1d
1 changed files with 13 additions and 0 deletions
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13
src/libsodium/crypto_onetimeauth/poly1305/53/auth_poly1305.c
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@ -4,7 +4,9 @@ D. J. Bernstein
Public domain.
*/
#include <fenv.h>
#include <stdint.h>
#include <stdlib.h>
#include "crypto_onetimeauth.h"
@ -232,6 +234,13 @@ int crypto_onetimeauth(unsigned char *out,const unsigned char *m,unsigned long l
register uint64 g3;
register uint64 g4;
const int previous_rounding_mode = fegetround();
if (previous_rounding_mode != FE_TONEAREST) {
if (fesetround(FE_TONEAREST) != 0) {
return -1;
}
}
r00 = *(uchar *) (r + 0);
constants = (char *) &poly1305_53_constants;
@ -1614,5 +1623,9 @@ nomorebytes:;
f3 >>= 8;
*(uchar *) (out + 15) = f3;
if (previous_rounding_mode != FE_TONEAREST &&
fesetround(previous_rounding_mode) != 0) {
abort();
}
return 0;
}