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Implement MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG

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Implement support for MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG.

For test purposes, write an implementation that uses libc rand().

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-11-13 18:47:18 +01:00
parent 1c49f1ac46
commit 4fc21fdeb6
6 changed files with 97 additions and 5 deletions
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30
library/psa_crypto_random.h
View file

@ -22,6 +22,34 @@
#ifndef PSA_CRYPTO_RANDOM_H
#define PSA_CRYPTO_RANDOM_H
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
#include <string.h>
#include <mbedtls/entropy.h> // only for error codes
#include <psa/crypto.h>
typedef mbedtls_psa_external_random_context_t mbedtls_psa_random_context_t;
static inline int mbedtls_psa_get_random( void *p_rng,
unsigned char *output,
size_t output_size )
{
(void) p_rng;
psa_status_t status = psa_generate_random( output, output_size );
if( status == PSA_SUCCESS )
return( 0 );
else
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
}
static inline void *mbedtls_psa_random_state( mbedtls_psa_random_context_t *rng )
{
(void) rng;
return( NULL );
}
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
/* Currently, the only supported RNG is Mbed TLS's CTR_DRBG seeded with
* mbedtls_entropy_func(). */
@ -127,4 +155,6 @@ static inline int mbedtls_psa_drbg_seed(
custom, len ) );
}
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
#endif /* PSA_CRYPTO_RANDOM_H */