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Introduce mbedtls_pk_get_psa_attributes

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Follow the specification in https://github.com/Mbed-TLS/mbedtls/pull/8657
as of dd77343381, i.e.
dd77343381/docs/architecture/psa-migration/psa-legacy-bridges.md (api-to-create-a-psa-key-from-a-pk-context)

This commit introduces the function declaration, its documentation, the
definition without the interesting parts and a negative unit test function.
Subsequent commits will add RSA, ECC and PK_OPAQUE support.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2024-01-18 14:11:26 +01:00
parent bc5d9165ae
commit 0b17255da1
4 changed files with 207 additions and 2 deletions
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26
library/pk.c
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@ -29,7 +29,7 @@
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
#include "psa_util_internal.h"
#include "md_psa.h"
#endif
@ -378,6 +378,30 @@ int mbedtls_pk_can_do_ext(const mbedtls_pk_context *ctx, psa_algorithm_t alg,
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
int mbedtls_pk_get_psa_attributes(const mbedtls_pk_context *pk,
psa_key_usage_t usage,
psa_key_attributes_t *attributes)
{
mbedtls_pk_type_t pk_type = mbedtls_pk_get_type(pk);
switch (pk_type) {
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
case MBEDTLS_PK_RSA_ALT:
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
default:
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
usage |= PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_COPY;
psa_set_key_usage_flags(attributes, usage);
return 0;
}
#endif
/*
* Helper for mbedtls_pk_sign and mbedtls_pk_verify
*/