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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 17572473c6
commit 6c83db7f7b
1 changed files with 18 additions and 0 deletions
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18
library/ssl_cli.c
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@ -2354,6 +2354,10 @@ static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
} }
#endif #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 ); return( 0 );
} }
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
@ -2463,6 +2467,13 @@ static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); 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 ); return( ret );
} }
#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || #endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
@ -2801,6 +2812,13 @@ start_processing:
#endif #endif
return( ret ); 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 */ #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */