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Create MBEDTLS_SSL_KEYING_MATERIAL_EXPORT option

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Add the option MBEDTLS_SSL_KEYING_MATERIAL_EXPORT to mbedtls_config.h
to control if the function mbedtls_ssl_export_keying_material() should
be available. By default, the option is disabled.

This is because the exporter for TLS 1.2 requires client_random and
server_random need to be stored after the handshake is complete.

Signed-off-by: Max Fillinger <max@max-fillinger.net>
This commit is contained in:
Max Fillinger
2024-10-25 00:52:24 +02:00
committed by Max Fillinger
parent 281fb79116
commit 2fe35f61bf
6 changed files with 55 additions and 19 deletions
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7
library/ssl_misc.h
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@@ -1118,10 +1118,11 @@ struct mbedtls_ssl_transform {
unsigned char out_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX];
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
#if defined(MBEDTLS_SSL_KEEP_RANDBYTES)
/* We need the Hello random bytes in order to re-derive keys from the
* Master Secret and other session info,
* see ssl_tls12_populate_transform() */
* Master Secret and other session info and for the keying material
* exporter in TLS 1.2.
* See ssl_tls12_populate_transform() */
unsigned char randbytes[MBEDTLS_SERVER_HELLO_RANDOM_LEN +
MBEDTLS_CLIENT_HELLO_RANDOM_LEN];
/*!< ServerHello.random+ClientHello.random */