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Improve comments about padlen convention

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The convention from the TLS RFC is a bit unusual, so even if the test
function's introductory comment mentions that we're taking the RFC's
definition, it doesn't hurt to repeat it in crucial places.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-07-22 11:42:57 +02:00
parent b51f04466f
commit e55653f085
1 changed files with 5 additions and 3 deletions
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8
tests/suites/test_suite_ssl.function
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@ -3479,7 +3479,7 @@ void ssl_decrypt_non_etm_cbc( int cipher_type, int hash_id, int trunc_hmac,
unsigned char *buf = NULL, *buf_save = NULL;
size_t buflen, olen = 0;
size_t plaintext_len, block_size, i;
unsigned char padlen;
unsigned char padlen; /* excluding the padding_length byte */
unsigned char add_data[13];
unsigned char mac[MBEDTLS_MD_MAX_SIZE];
int exp_ret;
@ -3502,7 +3502,8 @@ void ssl_decrypt_non_etm_cbc( int cipher_type, int hash_id, int trunc_hmac,
{
plaintext_len = 0;
/* Minimal padding */
/* Minimal padding
* The +1 is for the padding_length byte, not counted in padlen. */
padlen = block_size - ( t0.maclen + 1 ) % block_size;
/* Maximal padding? */
@ -3513,7 +3514,8 @@ void ssl_decrypt_non_etm_cbc( int cipher_type, int hash_id, int trunc_hmac,
{
padlen = length_selector;
/* Minimal non-zero plaintext_length givin desired padding */
/* Minimal non-zero plaintext_length giving desired padding.
* The +1 is for the padding_length byte, not counted in padlen. */
plaintext_len = block_size - ( padlen + t0.maclen + 1 ) % block_size;
}