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Note the expectations on mbedtls_psa_external_get_random()

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-11-18 15:27:37 +01:00
parent 89ffb28051
commit b663a60140
2 changed files with 16 additions and 0 deletions
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8
include/mbedtls/config.h
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@ -1342,6 +1342,14 @@
* Make the PSA Crypto module use an external random generator provided
* by a driver, instead of Mbed TLS's entropy and DRBG modules.
*
* \note This random generator must deliver random numbers with cryptographic
* quality and high performance. It must supply unpredictable numbers
* with a uniform distribution. The implementation of this function
* is responsible for ensuring that the random generator is seeded
* with sufficient entropy. If you have a hardware TRNG which is slow
* or delivers non-uniform output, declare it as an entropy source
* with mbedtls_entropy_add_source() instead of enabling this option.
*
* If you enable this option, you must supply configure the type
* ::mbedtls_psa_external_random_context_t in psa/crypto_platform.h
* and define a function called mbedtls_psa_external_get_random()