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Add config.h option MBEDTLS_ECP_NO_INTERNAL_RNG

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No effect so far, except on dependency checking, as the feature it's meant to
disable isn't implemented yet (so the descriptions in config.h and the
ChangeLog entry are anticipation for now).

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-05-19 12:38:31 +02:00
parent a7f6d25e12
commit 1a3f9edc08
7 changed files with 65 additions and 0 deletions
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5
ChangeLog.d/ecp-internal-rng.txt Normal file
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@ -0,0 +1,5 @@
Changes
* The ECP module, enabled by `MBEDTLS_ECP_C`, now depends on
`MBEDTLS_CTR_DRBG_C` or `MBEDTLS_HMAC_DRBG_C` for some side-channel
coutermeasures. If side channels are not a concern, this dependency can
be avoided by enabling the new option `MBEDTLS_ECP_NO_INTERNAL_RNG`.

8
include/mbedtls/check_config.h
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@ -156,6 +156,14 @@
#error "MBEDTLS_ECP_C defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_C) && !( \
defined(MBEDTLS_ECP_ALT) || \
defined(MBEDTLS_CTR_DRBG_C) || \
defined(MBEDTLS_HMAC_DRBG_C) || \
defined(MBEDTLS_ECP_NO_INTERNAL_RNG))
#error "MBEDTLS_ECP_C requires a DRBG module unless MBEDTLS_ECP_NO_INTERNAL_RNG is defined or an alternative implementation is used"
#endif
#if defined(MBEDTLS_PK_PARSE_C) && !defined(MBEDTLS_ASN1_PARSE_C)
#error "MBEDTLS_PK_PARSE_C defined, but not all prerequesites"
#endif

22
include/mbedtls/config.h
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@ -781,6 +781,28 @@
*/
#define MBEDTLS_ECP_NIST_OPTIM
/**
* \def MBEDTLS_ECP_NO_INTERNAL_RNG
*
* When this option is disabled, mbedtls_ecp_mul() will make use of an
* internal RNG when called with a NULL \c f_rng argument, in order to protect
* against some side-channel attacks.
*
* This protection introduces a dependency of the ECP module on one of the
* DRBG modules. For very constrained implementations that don't require this
* protection (for example, because you're only doing signature verification,
* so not manipulating any secret, or because local/physical side-channel
* attacks are outside your threat model), it might be desirable to get rid of
* that dependency.
*
* \warning Enabling this option makes some uses of ECP vulnerable to some
* side-channel attacks. Only enable it if you know that's not a problem for
* your use case.
*
* Uncomment this macro to disable some counter-measures in ECP.
*/
//#define MBEDTLS_ECP_NO_INTERNAL_RNG
/**
* \def MBEDTLS_ECP_RESTARTABLE
*

3
library/version_features.c
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@ -354,6 +354,9 @@ static const char * const features[] = {
#if defined(MBEDTLS_ECP_NIST_OPTIM)
"MBEDTLS_ECP_NIST_OPTIM",
#endif /* MBEDTLS_ECP_NIST_OPTIM */
#if defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
"MBEDTLS_ECP_NO_INTERNAL_RNG",
#endif /* MBEDTLS_ECP_NO_INTERNAL_RNG */
#if defined(MBEDTLS_ECP_RESTARTABLE)
"MBEDTLS_ECP_RESTARTABLE",
#endif /* MBEDTLS_ECP_RESTARTABLE */

8
programs/test/query_config.c
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@ -986,6 +986,14 @@ int query_config( const char *config )
}
#endif /* MBEDTLS_ECP_NIST_OPTIM */
#if defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
if( strcmp( "MBEDTLS_ECP_NO_INTERNAL_RNG", config ) == 0 )
{
MACRO_EXPANSION_TO_STR( MBEDTLS_ECP_NO_INTERNAL_RNG );
return( 0 );
}
#endif /* MBEDTLS_ECP_NO_INTERNAL_RNG */
#if defined(MBEDTLS_ECP_RESTARTABLE)
if( strcmp( "MBEDTLS_ECP_RESTARTABLE", config ) == 0 )
{

1
scripts/config.py
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@ -173,6 +173,7 @@ EXCLUDE_FROM_FULL = frozenset([
'MBEDTLS_DEPRECATED_REMOVED', # conflicts with deprecated options
'MBEDTLS_DEPRECATED_WARNING', # conflicts with deprecated options
'MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED', # influences the use of ECDH in TLS
'MBEDTLS_ECP_NO_INTERNAL_RNG', # removes a feature
'MBEDTLS_ECP_RESTARTABLE', # incompatible with USE_PSA_CRYPTO
'MBEDTLS_ENTROPY_FORCE_SHA256', # interacts with CTR_DRBG_128_BIT_KEY
'MBEDTLS_HAVE_SSE2', # hardware dependency

18
tests/scripts/all.sh
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@ -865,6 +865,24 @@ component_test_no_hmac_drbg () {
# so there's little value in running those lengthy tests here.
}
component_test_ecp_no_internal_rng () {
msg "build: Default plus ECP_NO_INTERNAL_RNG minus DRBG modules"
scripts/config.py set MBEDTLS_ECP_NO_INTERNAL_RNG
scripts/config.py unset MBEDTLS_CTR_DRBG_C
scripts/config.py unset MBEDTLS_HMAC_DRBG_C
scripts/config.py unset MBEDTLS_ECDSA_DETERMINISTIC # requires HMAC_DRBG
scripts/config.py unset MBEDTLS_PSA_CRYPTO_C # requires a DRBG
scripts/config.py unset MBEDTLS_PSA_CRYPTO_STORAGE_C # requires PSA Crypto
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
make
msg "test: ECP_NO_INTERNAL_RNG, no DRBG module"
make test
# no SSL tests as they all depend on having a DRBG
}
component_test_new_ecdh_context () {
msg "build: new ECDH context (ASan build)" # ~ 6 min
scripts/config.py unset MBEDTLS_ECDH_LEGACY_CONTEXT