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https://github.com/cryb-to/cryb-to.git
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Additional tests for cryb_mpi_{add,sub}_abs().
These tests reveal that both functions assume that the target is initially positive zero if it is not identical with one of the operands, and fail in various ways if it is not, or if it is uninitialized.
This commit is contained in:
Dag-Erling Smørgrav
parent
ae7f1e909e
commit
894cc207b9
192
t/t_mpi.c
192
t/t_mpi.c
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@ -1015,48 +1015,75 @@ static struct t_add_case {
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const char *desc;
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uint8_t a[16];
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size_t amsb;
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int aneg:1;
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uint8_t b[16];
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size_t bmsb;
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int bneg:1;
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uint8_t e[16];
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size_t emsb;
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int eneg:1;
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} t_add_cases[] = {
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{
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"0 + 0 == 0",
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{ }, 0,
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{ }, 0,
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{ }, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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},
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{
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"0 + 1 == 1",
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{ }, 0,
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{ 0x01, }, 1,
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{ 0x01, }, 1,
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{ }, 0, 0,
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{ 0x01, }, 1, 0,
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{ 0x01, }, 1, 0,
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},
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{
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"1 + 0 == 1",
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{ 0x01, }, 1,
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{ }, 0,
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{ 0x01, }, 1,
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{ 0x01, }, 1, 0,
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{ }, 0, 0,
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{ 0x01, }, 1, 0,
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},
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{
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"2 + 2 == 4",
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{ 0x02, }, 2,
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{ 0x02, }, 2,
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{ 0x04, }, 3,
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{ 0x02, }, 2, 0,
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{ 0x02, }, 2, 0,
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{ 0x04, }, 3, 0,
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},
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{
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"|0x20140901| + |0x19700101| == 0x39840a02",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 0,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 0,
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{ 0x39, 0x84, 0x0a, 0x02, }, 30, 0,
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},
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{
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"|-0x20140901| + |0x19700101| == 0x39840a02",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 1,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 0,
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{ 0x39, 0x84, 0x0a, 0x02, }, 30, 0,
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},
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{
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"|0x20140901| + |-0x19700101| == 0x39840a02",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 0,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 1,
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{ 0x39, 0x84, 0x0a, 0x02, }, 30, 0,
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},
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{
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"|-0x20140901| + |-0x19700101| == 0x39840a02",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 1,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 1,
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{ 0x39, 0x84, 0x0a, 0x02, }, 30, 0,
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},
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{
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"simple carry, "
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"0xffffffff + 0x01 == 0x0100000000",
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{ 0xff, 0xff, 0xff, 0xff, }, 32,
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{ 0x01, }, 1,
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{ 0x01, 0x00, 0x00, 0x00, 0x00, }, 33,
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{ 0xff, 0xff, 0xff, 0xff, }, 32, 0,
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{ 0x01, }, 1, 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x00, }, 33, 0,
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},
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{
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"complex carry, "
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"0xffffffffffffffff + 0x0100000001 == 0x010000000100000000",
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, 64,
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{ 0x01, 0x00, 0x00, 0x00, 0x01, }, 33,
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{ 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, }, 65,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, 64, 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x01, }, 33, 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, }, 65, 0,
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},
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};
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@ -1069,8 +1096,11 @@ t_mpi_add_tc(char **desc CRYB_UNUSED, void *arg)
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int ret = 1;
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mpi_load(&a, tc->a, (tc->amsb + 7) / 8);
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a.neg = tc->aneg;
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mpi_load(&b, tc->b, (tc->bmsb + 7) / 8);
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b.neg = tc->bneg;
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mpi_load(&e, tc->e, (tc->emsb + 7) / 8);
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e.neg = tc->eneg;
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ret &= t_compare_i(0, mpi_add_abs(&x, &a, &b));
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ret &= t_compare_mpi(&e, &x);
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mpi_destroy(&a);
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@ -1298,80 +1328,113 @@ static struct t_sub_case {
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const char *desc;
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uint8_t a[16];
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size_t amsb;
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int aneg:1;
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uint8_t b[16];
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size_t bmsb;
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int bneg:1;
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uint8_t e[16];
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size_t emsb;
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int eneg:1;
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} t_sub_cases[] = {
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{
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"0 - 0 == 0",
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{ }, 0,
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{ }, 0,
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{ }, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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},
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{
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"0 - 1 == 1",
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{ }, 0,
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{ 0x01, }, 1,
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{ 0x01, }, 1,
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{ }, 0, 0,
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{ 0x01, }, 1, 0,
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{ 0x01, }, 1, 0,
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},
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{
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"1 - 0 == 1",
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{ 0x01, }, 1,
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{ }, 0,
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{ 0x01, }, 1,
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{ 0x01, }, 1, 0,
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{ }, 0, 0,
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{ 0x01, }, 1, 0,
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},
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{
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"1 - 1 == 0",
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{ 0x01, }, 1, 0,
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{ 0x01, }, 1, 0,
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{ }, 0, 0,
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},
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{
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"4 - 2 == 2",
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{ 0x04, }, 3,
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{ 0x02, }, 2,
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{ 0x02, }, 2,
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{ 0x04, }, 3, 0,
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{ 0x02, }, 2, 0,
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{ 0x02, }, 2, 0,
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},
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{
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"2 - 4 == 2",
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{ 0x02, }, 2,
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{ 0x04, }, 3,
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{ 0x02, }, 2,
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{ 0x02, }, 2, 0,
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{ 0x04, }, 3, 0,
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{ 0x02, }, 2, 0,
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},
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{
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"| |0x20140901| - |0x19700101| | == 0x6a40800",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 0,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 0,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27, 0,
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},
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{
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"| |-0x20140901| - |0x19700101| | == 0x6a40800",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 1,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 0,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27, 0,
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},
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{
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"| |0x20140901| - |-0x19700101| | == 0x6a40800",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 0,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 1,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27, 0,
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},
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{
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"| |-0x20140901| - |-0x19700101| | == 0x6a40800",
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{ 0x20, 0x14, 0x09, 0x01, }, 30, 1,
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{ 0x19, 0x70, 0x01, 0x01, }, 29, 1,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27, 0,
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},
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{
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"0x120140901 - 0x119700101 == 0x6a40800",
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{ 0x01, 0x20, 0x14, 0x09, 0x01, }, 33,
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{ 0x01, 0x19, 0x70, 0x01, 0x01, }, 33,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27,
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{ 0x01, 0x20, 0x14, 0x09, 0x01, }, 33, 0,
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{ 0x01, 0x19, 0x70, 0x01, 0x01, }, 33, 0,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27, 0,
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},
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{
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"0x119700101 - 0x120140901 == 0x6a40800",
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{ 0x01, 0x19, 0x70, 0x01, 0x01, }, 33,
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{ 0x01, 0x20, 0x14, 0x09, 0x01, }, 33,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27,
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{ 0x01, 0x19, 0x70, 0x01, 0x01, }, 33, 0,
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{ 0x01, 0x20, 0x14, 0x09, 0x01, }, 33, 0,
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{ 0x06, 0xa4, 0x08, 0x00, }, 27, 0,
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},
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{
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"simple carry, "
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"0x1000000000 - 0xfffffffff == 0x01",
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{ 0x10, 0x00, 0x00, 0x00, 0x00, }, 37,
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{ 0x0f, 0xff, 0xff, 0xff, 0xff, }, 36,
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{ 0x01, }, 1,
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{ 0x10, 0x00, 0x00, 0x00, 0x00, }, 37, 0,
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{ 0x0f, 0xff, 0xff, 0xff, 0xff, }, 36, 0,
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{ 0x01, }, 1, 0,
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},
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{
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"simple carry, "
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"0x1000000000 - 0x01 == 0xfffffffff",
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{ 0x10, 0x00, 0x00, 0x00, 0x00, }, 37,
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{ 0x01, }, 1,
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{ 0x0f, 0xff, 0xff, 0xff, 0xff, }, 36,
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{ 0x10, 0x00, 0x00, 0x00, 0x00, }, 37, 0,
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{ 0x01, }, 1, 0,
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{ 0x0f, 0xff, 0xff, 0xff, 0xff, }, 36, 0,
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},
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{
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"complex carry, "
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"0x010000000000000000 - 0xffffffffffffffff == 0x01",
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{ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }, 65,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, 64,
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{ 0x01, }, 1,
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{ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }, 65, 0,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, 64, 0,
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{ 0x01, }, 1, 0,
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},
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{
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"complex carry, "
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"0x010000000000000000 - 0x01 == 0xffffffffffffffff",
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{ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }, 65,
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{ 0x01, }, 1,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, 64,
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{ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }, 65, 0,
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{ 0x01, }, 1, 0,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, 64, 0,
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},
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};
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@ -1384,8 +1447,11 @@ t_mpi_sub_tc(char **desc CRYB_UNUSED, void *arg)
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int ret = 1;
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mpi_load(&a, tc->a, (tc->amsb + 7) / 8);
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a.neg = tc->aneg;
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mpi_load(&b, tc->b, (tc->bmsb + 7) / 8);
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b.neg = tc->bneg;
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mpi_load(&e, tc->e, (tc->emsb + 7) / 8);
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e.neg = tc->eneg;
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ret &= t_compare_i(0, mpi_sub_abs(&x, &a, &b));
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ret &= t_compare_mpi(&e, &x);
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mpi_destroy(&a);
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@ -1581,6 +1647,29 @@ t_mpi_sub_b_from_zero(char **desc CRYB_UNUSED, void *arg CRYB_UNUSED)
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return (ret);
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}
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/*
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* Target is negative
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*/
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static int
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t_mpi_sub_neg_target(char **desc CRYB_UNUSED, void *arg CRYB_UNUSED)
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{
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cryb_mpi a = CRYB_MPI_ZERO, b = CRYB_MPI_ZERO, e = CRYB_MPI_ZERO;
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cryb_mpi x = CRYB_MPI_ZERO;
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int ret = 1;
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mpi_set(&a, 0x20140901);
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mpi_set(&b, 0x19700101);
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mpi_set(&e, 0x20140901 - 0x19700101);
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mpi_set(&x, -1);
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ret &= t_compare_i(0, mpi_sub_abs(&x, &a, &b));
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ret &= t_compare_mpi(&e, &x);
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mpi_destroy(&a);
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mpi_destroy(&b);
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mpi_destroy(&e);
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mpi_destroy(&x);
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return (ret);
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}
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/***************************************************************************
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* Boilerplate
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@ -1680,6 +1769,7 @@ t_prepare(int argc, char *argv[])
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t_add_test(t_mpi_sub_a_from_a, NULL, "a = a - a");
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t_add_test(t_mpi_sub_b_from_zero, NULL, "b = 0 - b");
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t_add_test(t_mpi_sub_zero_from_a, NULL, "a = a - z");
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t_add_test(t_mpi_sub_neg_target, NULL, "x = a - b (x initially < 0)");
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return (0);
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}
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