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Explain the design of mbedtls_psa_get_random better

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-01-05 16:03:55 +01:00
parent 0c59ba88cb
commit 9c3e060253
2 changed files with 20 additions and 2 deletions
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4
library/psa_crypto_random_impl.h
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@ -30,10 +30,12 @@
typedef mbedtls_psa_external_random_context_t mbedtls_psa_random_context_t;
/* Trivial wrapper around psa_generate_random(). */
int mbedtls_psa_get_random( void *p_rng,
unsigned char *output,
size_t output_size );
/* The PSA RNG API doesn't need any externally maintained state. */
#define MBEDTLS_PSA_RANDOM_STATE NULL
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
@ -163,6 +165,8 @@ static mbedtls_f_rng_t *const mbedtls_psa_get_random = mbedtls_hmac_drbg_random;
* This variable is only intended to be used through the macro
* #MBEDTLS_PSA_RANDOM_STATE.
*/
/* psa_crypto.c sets this variable to a pointer to the DRBG state in the
* global PSA crypto state. */
extern mbedtls_psa_drbg_context_t *const mbedtls_psa_random_state;
/** A pointer to the PSA DRBG state.