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/* BEGIN_HEADER */
#include "common.h"
static void fill_arrays(unsigned char *a,
unsigned char *b,
unsigned char *r1,
unsigned char *r2,
size_t n)
{
for (size_t i = 0; i < n; i++) {
a[i] = (unsigned char) i * 3;
b[i] = (unsigned char) i * 3 + 1;
r1[i] = (unsigned char) i * 3 + 2;
r2[i] = r1[i];
}
}
/* END_HEADER */
/* BEGIN_CASE */
void mbedtls_xor(int len)
{
size_t n = (size_t) len;
unsigned char *a = NULL, *b = NULL, *r1 = NULL, *r2 = NULL;
TEST_CALLOC(a, n + 1);
TEST_CALLOC(b, n + 1);
TEST_CALLOC(r1, n + 1);
TEST_CALLOC(r2, n + 1);
/* Test non-overlapping */
fill_arrays(a, b, r1, r2, n);
for (size_t i = 0; i < n; i++) {
r1[i] = a[i] ^ b[i];
}
mbedtls_xor(r2, a, b, n);
TEST_MEMORY_COMPARE(r1, n, r2, n);
/* Test r == a */
fill_arrays(a, b, r1, r2, n);
for (size_t i = 0; i < n; i++) {
r1[i] = r1[i] ^ b[i];
}
mbedtls_xor(r2, r2, b, n);
TEST_MEMORY_COMPARE(r1, n, r2, n);
/* Test r == b */
fill_arrays(a, b, r1, r2, n);
for (size_t i = 0; i < n; i++) {
r1[i] = a[i] ^ r1[i];
}
mbedtls_xor(r2, a, r2, n);
TEST_MEMORY_COMPARE(r1, n, r2, n);
/* Test a == b */
fill_arrays(a, b, r1, r2, n);
for (size_t i = 0; i < n; i++) {
r1[i] = a[i] ^ a[i];
}
mbedtls_xor(r2, a, a, n);
TEST_MEMORY_COMPARE(r1, n, r2, n);
/* Test a == b == r */
fill_arrays(a, b, r1, r2, n);
for (size_t i = 0; i < n; i++) {
r1[i] = r1[i] ^ r1[i];
}
mbedtls_xor(r2, r2, r2, n);
TEST_MEMORY_COMPARE(r1, n, r2, n);
/* Test non-word-aligned buffers, for all combinations of alignedness */
for (int i = 0; i < 7; i++) {
int r_off = i & 1, a_off = (i & 2) >> 1, b_off = (i & 4) >> 2;
fill_arrays(a, b, r1, r2, n + 1);
for (size_t j = 0; j < n; j++) {
r1[j + r_off] = a[j + a_off] ^ b[j + b_off];
}
mbedtls_xor(r2 + r_off, a + a_off, b + b_off, n);
TEST_MEMORY_COMPARE(r1 + r_off, n, r2 + r_off, n);
}
exit:
mbedtls_free(a);
mbedtls_free(b);
mbedtls_free(r1);
mbedtls_free(r2);
}
/* END_CASE */
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