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Change mp_leading_bit (integer.c) to not to require a copy

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This commit is contained in:
Sean Parkinson
2020-07-13 16:24:02 +10:00
parent 1caa6f860b
commit e754076c37
2 changed files with 4 additions and 17 deletions
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2
src/ssl.c
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@@ -41804,7 +41804,7 @@ int wolfSSL_X509_NAME_print_ex(WOLFSSL_BIO* bio, WOLFSSL_X509_NAME* name,
if (i < count - 1) { if (i < count - 1) {
/* tmpSz+1 for last null char */ /* tmpSz+1 for last null char */
XSNPRINTF(tmp, tmpSz+1, "%s=%s,", buf, str->data); XSNPRINTF(tmp, tmpSz+1, "%s=%s,", buf, str->data);
XSTRNCAT(fullName, tmp, tmpSz); XSTRNCAT(fullName, tmp, tmpSz+1);
} }
else { else {
XSNPRINTF(tmp, tmpSz, "%s=%s", buf, str->data); XSNPRINTF(tmp, tmpSz, "%s=%s", buf, str->data);

19
wolfcrypt/src/integer.c
View File

@@ -271,23 +271,10 @@ int mp_count_bits (mp_int * a)
int mp_leading_bit (mp_int * a) int mp_leading_bit (mp_int * a)
{ {
int bit = 0; int c = mp_count_bits(a);
mp_int t;
if (mp_init_copy(&t, a) != MP_OKAY) if (c == 0) return 0;
return 0; return (c % 8) == 0;
while (mp_iszero(&t) == MP_NO) {
#ifndef MP_8BIT
bit = (t.dp[0] & 0x80) != 0;
#else
bit = ((t.dp[0] | ((t.dp[1] & 0x01) << 7)) & 0x80) != 0;
#endif
if (mp_div_2d (&t, 8, &t, NULL) != MP_OKAY)
break;
}
mp_clear(&t);
return bit;
} }
int mp_to_unsigned_bin_at_pos(int x, mp_int *t, unsigned char *b) int mp_to_unsigned_bin_at_pos(int x, mp_int *t, unsigned char *b)