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Support mbedtls_psa_get_random() in SSL test programs

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The SSL test programs can now use mbedtls_psa_get_random() rather than
entropy+DRBG as a random generator. This happens if
the configuration option MBEDTLS_USE_PSA_CRYPTO is enabled, or if
MBEDTLS_TEST_USE_PSA_CRYPTO_RNG is set at build time.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-02-03 20:07:11 +01:00
parent e3ed802138
commit 8eb2943705
3 changed files with 78 additions and 4 deletions
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29
programs/ssl/ssl_test_lib.h
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@ -130,10 +130,38 @@ void my_debug( void *ctx, int level,
mbedtls_time_t dummy_constant_time( mbedtls_time_t* time );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/* If MBEDTLS_TEST_USE_PSA_CRYPTO_RNG is defined, the SSL test programs will use
* mbedtls_psa_get_random() rather than entropy+DRBG as a random generator.
*
* The constraints are:
* - Without the entropy module, the PSA RNG is the only option.
* - Without at least one of the DRBG modules, the PSA RNG is the only option.
* - The PSA RNG does not support explicit seeding, so it is incompatible with
* the reproducible mode used by test programs.
* - For good overall test coverage, there should be at least one configuration
* where the test programs use the PSA RNG while the PSA RNG is itself based
* on entropy+DRBG, and at least one configuration where the test programs
* do not use the PSA RNG even though it's there.
*
* A simple choice that meets the constraints is to use the PSA RNG whenever
* MBEDTLS_USE_PSA_CRYPTO is enabled. There's no real technical reason the
* choice to use the PSA RNG in the test programs and the choice to use
* PSA crypto when TLS code needs crypto have to be tied together, but it
* happens to be a good match. It's also a good match from an application
* perspective: either PSA is preferred for TLS (both for crypto and for
* random generation) or it isn't.
*/
#define MBEDTLS_TEST_USE_PSA_CRYPTO_RNG
#endif
/** A context for random number generation (RNG).
*/
typedef struct
{
#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
unsigned char dummy;
#else /* MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
mbedtls_entropy_context entropy;
#if defined(MBEDTLS_CTR_DRBG_C)
mbedtls_ctr_drbg_context drbg;
@ -142,6 +170,7 @@ typedef struct
#else
#error "No DRBG available"
#endif
#endif /* MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
} rng_context_t;
/** Initialize the RNG.