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| author | Denys Vlasenko | 2018-11-23 18:02:44 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2018-11-23 18:02:44 +0100 |
| commit | 5e4236d226309a32842a6928878fd0e1cd5937e7 (patch) | |
| tree | eb41a6c5cbaaac79b22b8c200e0aabfe26ba7d15 /networking/tls.c | |
| parent | 83e5c627e1b2c7f34d694696d0c3d5a3ce25dc59 (diff) | |
| download | busybox-5e4236d226309a32842a6928878fd0e1cd5937e7.zip busybox-5e4236d226309a32842a6928878fd0e1cd5937e7.tar.gz | |
tls: in AES-CBC code, do not set key for every record - do it once
function old new delta
aes_setkey 16 212 +196
tls_handshake 1941 1977 +36
aes_encrypt_1 382 396 +14
xwrite_encrypted 605 604 -1
tls_xread_record 659 656 -3
aes_encrypt_one_block 65 59 -6
aes_cbc_encrypt 172 121 -51
aesgcm_setkey 58 - -58
aes_cbc_decrypt 958 881 -77
KeyExpansion 188 - -188
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 3/5 up/down: 246/-384) Total: -138 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking/tls.c')
| -rw-r--r-- | networking/tls.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/networking/tls.c b/networking/tls.c index 38a965a..23622d7 100644 --- a/networking/tls.c +++ b/networking/tls.c @@ -758,7 +758,7 @@ static void xwrite_encrypted_and_hmac_signed(tls_state_t *tls, unsigned size, un /* Encrypt content+MAC+padding in place */ //optimize key setup aes_cbc_encrypt( - tls->client_write_key, tls->key_size, /* selects 128/256 */ + &tls->aes_decrypt, /* selects 128/256 */ buf - AES_BLOCK_SIZE, /* IV */ buf, size, /* plaintext */ buf /* ciphertext */ @@ -1061,7 +1061,7 @@ static int tls_xread_record(tls_state_t *tls, const char *expected) /* Decrypt content+MAC+padding, moving it over IV in the process */ sz -= AES_BLOCK_SIZE; /* we will overwrite IV now */ aes_cbc_decrypt( - tls->server_write_key, tls->key_size, /* selects 128/256 */ + &tls->aes_decrypt, /* selects 128/256 */ p, /* IV */ p + AES_BLOCK_SIZE, sz, /* ciphertext */ p /* plaintext */ @@ -1934,8 +1934,14 @@ static void send_client_key_exchange(tls_state_t *tls) dump_hex("client_write_IV:%s\n", tls->client_write_IV, tls->IV_size ); - aesgcm_setkey(tls->H, &tls->aes_encrypt, tls->client_write_key, tls->key_size); + aes_setkey(&tls->aes_decrypt, tls->server_write_key, tls->key_size); + aes_setkey(&tls->aes_encrypt, tls->client_write_key, tls->key_size); + { + uint8_t iv[AES_BLOCK_SIZE]; + memset(iv, 0, AES_BLOCK_SIZE); + aes_encrypt_one_block(&tls->aes_encrypt, iv, tls->H); + } } } |