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Start refining parameters of populate_transform()

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Parameters 'handshake' and 'ssl' will be replaced with more fine-grained
inputs in follow-up commits.
This commit is contained in:
Manuel Pégourié-Gonnard 2019-05-06 12:55:40 +02:00
parent a1abb26094
commit 12a3f445b6
1 changed files with 17 additions and 9 deletions
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26
library/ssl_tls.c
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@ -608,12 +608,21 @@ static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
/*
* This function will ultimetaly only be responsible for populating a
* transform structure from data passed as explicit parameters.
* Populate a transform structure with session keys and all the other
* necessary information.
*
* For now however it's doing rather more in a rather less explicit way.
* Parameters:
* - [in/out]: transform: structure to populate
* [in] must be just initialised with mbedtls_ssl_transform_init()
* [out] fully populate, ready for use by mbedtls_ssl_{en,de}crypt_buf()
* - [in] session: used members: encrypt_then_max, master, compression
* - [in] handshake: used members: prf, ciphersuite_info, randbytes
* - [in]: ssl: used members: minor_ver, conf->endpoint
*/
static int ssl_populate_transform( mbedtls_ssl_context *ssl )
static int ssl_populate_transform( mbedtls_ssl_transform *transform,
const mbedtls_ssl_session *session,
const mbedtls_ssl_handshake_params *handshake,
const mbedtls_ssl_context *ssl )
{
int ret = 0;
unsigned char keyblk[256];
@ -628,10 +637,6 @@ static int ssl_populate_transform( mbedtls_ssl_context *ssl )
const mbedtls_cipher_info_t *cipher_info;
const mbedtls_md_info_t *md_info;
mbedtls_ssl_session *session = ssl->session_negotiate;
mbedtls_ssl_transform *transform = ssl->transform_negotiate;
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
transform->encrypt_then_mac = session->encrypt_then_mac;
#endif
@ -1170,7 +1175,10 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
}
/* Populate transform structure */
ret = ssl_populate_transform( ssl );
ret = ssl_populate_transform( ssl->transform_negotiate,
ssl->session_negotiate,
ssl->handshake,
ssl );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_populate_transform", ret );