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include: util: Add mem_xor functions

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Add functions to do XOR on arrays of memory, with one that
takes arbitrary sizes and one for 32 bits and 128 bits as
those are common sizes for this functionality.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
This commit is contained in:
Emil Gydesen 2024-01-03 13:31:58 +01:00 • committed by Carles Cufí
commit 87c8b897b3
9 changed files with 117 additions and 42 deletions
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71
tests/unit/util/main.c
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@ -646,4 +646,75 @@ skipped_c:
#undef test_IF_DISABLED_FLAG_B
}
ZTEST(util, test_mem_xor_n)
{
const size_t max_len = 128;
uint8_t expected_result[max_len];
uint8_t src1[max_len];
uint8_t src2[max_len];
uint8_t dst[max_len];
memset(expected_result, 0, sizeof(expected_result));
memset(src1, 0, sizeof(src1));
memset(src2, 0, sizeof(src2));
memset(dst, 0, sizeof(dst));
for (size_t i = 0U; i < max_len; i++) {
const size_t len = i;
for (size_t j = 0U; j < len; j++) {
src1[j] = 0x33;
src2[j] = 0x0F;
expected_result[j] = 0x3C;
}
mem_xor_n(dst, src1, src2, len);
zassert_mem_equal(expected_result, dst, len);
}
}
ZTEST(util, test_mem_xor_32)
{
uint8_t expected_result[4];
uint8_t src1[4];
uint8_t src2[4];
uint8_t dst[4];
memset(expected_result, 0, sizeof(expected_result));
memset(src1, 0, sizeof(src1));
memset(src2, 0, sizeof(src2));
memset(dst, 0, sizeof(dst));
for (size_t i = 0U; i < 4; i++) {
src1[i] = 0x43;
src2[i] = 0x0F;
expected_result[i] = 0x4C;
}
mem_xor_32(dst, src1, src2);
zassert_mem_equal(expected_result, dst, 4);
}
ZTEST(util, test_mem_xor_128)
{
uint8_t expected_result[16];
uint8_t src1[16];
uint8_t src2[16];
uint8_t dst[16];
memset(expected_result, 0, sizeof(expected_result));
memset(src1, 0, sizeof(src1));
memset(src2, 0, sizeof(src2));
memset(dst, 0, sizeof(dst));
for (size_t i = 0U; i < 16; i++) {
src1[i] = 0x53;
src2[i] = 0x0F;
expected_result[i] = 0x5C;
}
mem_xor_128(dst, src1, src2);
zassert_mem_equal(expected_result, dst, 16);
}
ZTEST_SUITE(util, NULL, NULL, NULL, NULL, NULL);