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Use CT interface in get_zeros_padding

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-09-19 16:19:38 +01:00
parent 1cfc43c77b
commit d8c68a948a
1 changed files with 3 additions and 3 deletions
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6
library/cipher.c
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@ -983,7 +983,7 @@ static int get_zeros_padding(unsigned char *input, size_t input_len,
size_t *data_len)
{
size_t i;
unsigned char done = 0, prev_done;
mbedtls_ct_condition_t done = MBEDTLS_CT_FALSE, prev_done;
if (NULL == input || NULL == data_len) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
@ -992,8 +992,8 @@ static int get_zeros_padding(unsigned char *input, size_t input_len,
*data_len = 0;
for (i = input_len; i > 0; i--) {
prev_done = done;
done |= (input[i-1] != 0);
*data_len |= i * (done != prev_done);
done = mbedtls_ct_bool_or(done, mbedtls_ct_uint_ne(input[i-1], 0));
*data_len = mbedtls_ct_size_if(mbedtls_ct_bool_ne(done, prev_done), i, *data_len);
}
return 0;