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imxtools/sbtools: add crypto code for documentation purpose

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Change-Id: I4f3c659d65c1453b192cbce4bf6c85d882761929
This commit is contained in:
Amaury Pouly 2012-12-26 01:01:19 +01:00
parent 54a414b69e
commit c3a7190d78
1 changed files with 43 additions and 0 deletions
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43
utils/imxtools/sbtools/xorcrypt.c
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@ -54,6 +54,49 @@ static uint32_t do_round(union xorcrypt_key_t *key)
return key->k[0];
}
static uint32_t do_unround(union xorcrypt_key_t *key)
{
uint32_t k7 = key->k[6];
uint32_t k2 = key->k[1];
uint32_t k11 = key->k[10] >> 31 | key->k[10] << 1;
uint32_t k0 = key->k[0];
key->k[0] = key->k[15];
key->k[15] = key->k[14];
key->k[14] = key->k[13];
key->k[13] = key->k[12];
key->k[12] = key->k[11] ^ k11;
key->k[11] = k11;
key->k[10] = key->k[9];
key->k[9] = key->k[8];
key->k[8] = key->k[7] ^ k7;
key->k[7] = key->k[6];
key->k[6] = key->k[5];
key->k[5] = key->k[4];
key->k[4] = key->k[3];
key->k[3] = key->k[2] ^ k2;
key->k[2] = key->k[1];
key->k[1] = k0 ^ key->k[0] ^ key->k[5] ^ key->k[3] ^ key->k[7] ^ key->k[11] ^ key->k[13];
return 0;
}
static void test_round(union xorcrypt_key_t keys[2])
{
union xorcrypt_key_t save[2];
memcpy(save, keys, sizeof(save));
do_round(keys);
do_unround(keys);
if(memcmp(save, keys, sizeof(save)))
{
printf("Mismatch\n");
for(int i = 0; i < 16; i++)
printf(" %s%08x", save[0].k[i] == keys[0].k[i] ? YELLOW : RED, save[0].k[i]);
printf("\n");
for(int i = 0; i < 16; i++)
printf(" %s%08x", save[0].k[i] == keys[0].k[i] ? YELLOW : RED, keys[0].k[i]);
printf("\n");
}
}
uint32_t xor_encrypt(union xorcrypt_key_t keys[2], void *_data, int size)
{
if(size % 4)