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Add direct tests of division/modulus to testbn.

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I'm about to rewrite the division code, so it'll be useful to have a
way to test it directly, particularly one which exercises difficult
cases such as extreme values of the leading word and remainders just
above and below zero.
This commit is contained in:
Simon Tatham
2015-12-13 14:46:43 +00:00
parent 90c7b1562c
commit 984792e9f4
2 changed files with 74 additions and 0 deletions
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59
sshbn.c
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@ -2059,6 +2059,65 @@ int main(int argc, char **argv)
freebn(modulus);
freebn(expected);
freebn(answer);
} else if (!strcmp(buf, "divmod")) {
Bignum n, d, expect_q, expect_r, answer_q, answer_r;
int fail;
if (ptrnum != 4) {
printf("%d: divmod with %d parameters, expected 4\n", line, ptrnum);
exit(1);
}
n = bignum_from_bytes(ptrs[0], ptrs[1]-ptrs[0]);
d = bignum_from_bytes(ptrs[1], ptrs[2]-ptrs[1]);
expect_q = bignum_from_bytes(ptrs[2], ptrs[3]-ptrs[2]);
expect_r = bignum_from_bytes(ptrs[3], ptrs[4]-ptrs[3]);
answer_q = bigdiv(n, d);
answer_r = bigmod(n, d);
fail = FALSE;
if (bignum_cmp(expect_q, answer_q) != 0) {
char *as = bignum_decimal(n);
char *bs = bignum_decimal(d);
char *cs = bignum_decimal(answer_q);
char *ds = bignum_decimal(expect_q);
printf("%d: fail: %s / %s gave %s expected %s\n",
line, as, bs, cs, ds);
fail = TRUE;
sfree(as);
sfree(bs);
sfree(cs);
sfree(ds);
}
if (bignum_cmp(expect_r, answer_r) != 0) {
char *as = bignum_decimal(n);
char *bs = bignum_decimal(d);
char *cs = bignum_decimal(answer_r);
char *ds = bignum_decimal(expect_r);
printf("%d: fail: %s mod %s gave %s expected %s\n",
line, as, bs, cs, ds);
fail = TRUE;
sfree(as);
sfree(bs);
sfree(cs);
sfree(ds);
}
freebn(n);
freebn(d);
freebn(expect_q);
freebn(expect_r);
freebn(answer_q);
freebn(answer_r);
if (fail)
fails++;
else
passes++;
} else {
printf("%d: unrecognised test keyword: '%s'\n", line, buf);
exit(1);