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Add error check to mp_sqrtmod_prime()

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Signed-off-by: Tom St Denis <tstdenis82@gmail.com>
This commit is contained in:
Tom St Denis 2015-10-30 18:08:42 -04:00
parent 5b3178d83e
commit 575d9bac4b
1 changed files with 3 additions and 1 deletions
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4
bn_mp_sqrtmod_prime.c
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@ -30,7 +30,9 @@ int mp_sqrtmod_prime(mp_int *n, mp_int *prime, mp_int *ret)
if ((res = mp_jacobi(n, prime, &legendre)) != MP_OKAY) return res; if ((res = mp_jacobi(n, prime, &legendre)) != MP_OKAY) return res;
if (legendre == -1) return MP_VAL; /* quadratic non-residue mod prime */ if (legendre == -1) return MP_VAL; /* quadratic non-residue mod prime */
mp_init_multi(&t1, &C, &Q, &S, &Z, &M, &T, &R, &two, NULL); if ((res = mp_init_multi(&t1, &C, &Q, &S, &Z, &M, &T, &R, &two, NULL)) != MP_OKAY) {
return res;
}
/* SPECIAL CASE: if prime mod 4 == 3 /* SPECIAL CASE: if prime mod 4 == 3
* compute directly: res = n^(prime+1)/4 mod prime * compute directly: res = n^(prime+1)/4 mod prime