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mpint: add a few simple bitwise operations.

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I want to use mp_xor_into as part of an upcoming test program, and
while I'm at it, I thought I'd add a few other obvious bitops too.
This commit is contained in:
Simon Tatham
2019-02-09 14:00:06 +00:00
parent 8ccbd164c7
commit bfae3ee96e
4 changed files with 61 additions and 0 deletions
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32
mpint.c
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@ -692,6 +692,38 @@ void mp_sub_into(mp_int *r, mp_int *a, mp_int *b)
mp_add_masked_into(r->w, r->nw, a, b, ~(BignumInt)0, ~(BignumInt)0, 1);
}
void mp_and_into(mp_int *r, mp_int *a, mp_int *b)
{
for (size_t i = 0; i < r->nw; i++) {
BignumInt aword = mp_word(a, i), bword = mp_word(b, i);
r->w[i] = aword & bword;
}
}
void mp_or_into(mp_int *r, mp_int *a, mp_int *b)
{
for (size_t i = 0; i < r->nw; i++) {
BignumInt aword = mp_word(a, i), bword = mp_word(b, i);
r->w[i] = aword | bword;
}
}
void mp_xor_into(mp_int *r, mp_int *a, mp_int *b)
{
for (size_t i = 0; i < r->nw; i++) {
BignumInt aword = mp_word(a, i), bword = mp_word(b, i);
r->w[i] = aword ^ bword;
}
}
void mp_bic_into(mp_int *r, mp_int *a, mp_int *b)
{
for (size_t i = 0; i < r->nw; i++) {
BignumInt aword = mp_word(a, i), bword = mp_word(b, i);
r->w[i] = aword & ~bword;
}
}
static void mp_cond_negate(mp_int *r, mp_int *x, unsigned yes)
{
BignumCarry carry = yes;