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CT fix for get_zeros_padding

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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Dave Rodgman
2023-09-20 14:54:29 +01:00
parent 51773aa68b
commit c1a17f5458
1 changed files with 2 additions and 1 deletions
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3
library/cipher.c
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@ -879,7 +879,8 @@ static int get_zeros_padding(unsigned char *input, size_t input_len,
for (i = input_len; i > 0; i--) {
prev_done = done;
done |= (input[i-1] != 0);
*data_len |= i * (done != prev_done);
size_t mask = mbedtls_ct_size_mask(done ^ prev_done);
*data_len |= i & mask;
}
return 0;