diff options
Diffstat (limited to 'networking/tls_sp_c32.c')
| -rw-r--r-- | networking/tls_sp_c32.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/networking/tls_sp_c32.c b/networking/tls_sp_c32.c index 99f9c68..bba22de 100644 --- a/networking/tls_sp_c32.c +++ b/networking/tls_sp_c32.c @@ -163,11 +163,13 @@ static void dump_512(const char *fmt, const sp_digit* cr) a[j] = 0; for (i = 0; i < 20 && j >= 0; i++) { b = 0; - a[j--] |= r[i] << s; b += 8 - s; + a[j--] |= r[i] << s; + b += 8 - s; if (j < 0) break; while (b < 26) { - a[j--] = r[i] >> b; b += 8; + a[j--] = r[i] >> b; + b += 8; if (j < 0) break; } @@ -286,9 +288,10 @@ static void sp_256_mont_add_10(sp_digit* r, const sp_digit* a, const sp_digit* b { sp_256_add_10(r, a, b); sp_256_norm_10(r); - if ((r[9] >> 22) > 0) + if ((r[9] >> 22) > 0) { sp_256_sub_10(r, r, m); - sp_256_norm_10(r); + sp_256_norm_10(r); + } } /* Subtract two Montgomery form numbers (r = a - b % m) */ @@ -296,10 +299,12 @@ static void sp_256_mont_sub_10(sp_digit* r, const sp_digit* a, const sp_digit* b const sp_digit* m) { sp_256_sub_10(r, a, b); - if (r[9] >> 22) - sp_256_add_10(r, r, m); sp_256_norm_10(r); - r[9] &= 0x03fffff; /* truncate to 22 bits */ + if (r[9] >> 22) { + sp_256_add_10(r, r, m); + sp_256_norm_10(r); + r[9] &= 0x03fffff; /* truncate to 22 bits */ + } } /* Double a Montgomery form number (r = a + a % m) */ @@ -317,14 +322,17 @@ static void sp_256_mont_tpl_10(sp_digit* r, const sp_digit* a, const sp_digit* m { sp_256_add_10(r, a, a); sp_256_norm_10(r); - if ((r[9] >> 22) > 0) + if ((r[9] >> 22) > 0) { sp_256_sub_10(r, r, m); - sp_256_norm_10(r); + sp_256_norm_10(r); + } sp_256_add_10(r, r, a); sp_256_norm_10(r); - if ((r[9] >> 22) > 0) + if ((r[9] >> 22) > 0) { sp_256_sub_10(r, r, m); - sp_256_norm_10(r); + sp_256_norm_10(r); + } + r[9] &= 0x03fffff; /* truncate to 22 bits */ } /* Shift the result in the high 256 bits down to the bottom. */ @@ -650,6 +658,13 @@ static void sp_256_proj_point_dbl_10(sp_point* r, sp_point* p) if (r->infinity) /* If infinity, don't double */ return; + if (SP_DEBUG) { + /* unused part of t2, may result in spurios + * differences in debug output. Clear it. + */ + memset(t2, 0, sizeof(t2)); + } + /* T1 = Z * Z */ sp_256_mont_sqr_10(t1, r->z /*, p256_mod, p256_mp_mod*/); /* Z = Y * Z */ |