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Free peer's public key as soon as it's no longer needed

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On constrained devices, this saves a significant amount of RAM that
might be needed for subsequent expensive operations like ECDHE.
This commit is contained in:
Hanno Becker 2019-02-08 14:06:00 +00:00
parent b9d4479080
commit ae553dde3a
1 changed files with 18 additions and 0 deletions
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18
library/ssl_cli.c
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@ -2331,6 +2331,10 @@ static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
}
#endif
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* We don't need the peer's public key anymore. Free it. */
mbedtls_pk_free( peer_pk );
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
return( 0 );
}
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
@ -2440,6 +2444,13 @@ static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
}
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* We don't need the peer's public key anymore. Free it,
* so that more RAM is available for upcoming expensive
* operations like ECDHE. */
mbedtls_pk_free( peer_pk );
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
return( ret );
}
#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
@ -2796,6 +2807,13 @@ start_processing:
#endif
return( ret );
}
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* We don't need the peer's public key anymore. Free it,
* so that more RAM is available for upcoming expensive
* operations like ECDHE. */
mbedtls_pk_free( peer_pk );
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
}
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */