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New function mbedtls_pk_copy_public_from_psa

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Document and implement mbedtls_pk_copy_public_from_psa() to export the
public key of a PSA key into PK.

Unit-test it alongside mbedtls_pk_copy_from_psa().

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2024-03-06 13:39:01 +01:00
parent d7e7f48323
commit bf69f2e682
4 changed files with 157 additions and 6 deletions
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26
library/pk.c
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@ -1379,7 +1379,9 @@ mbedtls_pk_type_t mbedtls_pk_get_type(const mbedtls_pk_context *ctx)
}
#if defined(MBEDTLS_PSA_CRYPTO_C)
int mbedtls_pk_copy_from_psa(mbedtls_svc_key_id_t key_id, mbedtls_pk_context *pk)
static int copy_from_psa(mbedtls_svc_key_id_t key_id,
mbedtls_pk_context *pk,
int public_only)
{
psa_status_t status;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
@ -1400,13 +1402,20 @@ int mbedtls_pk_copy_from_psa(mbedtls_svc_key_id_t key_id, mbedtls_pk_context *pk
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
status = psa_export_key(key_id, exp_key, sizeof(exp_key), &exp_key_len);
if (public_only) {
status = psa_export_public_key(key_id, exp_key, sizeof(exp_key), &exp_key_len);
} else {
status = psa_export_key(key_id, exp_key, sizeof(exp_key), &exp_key_len);
}
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto exit;
}
key_type = psa_get_key_type(&key_attr);
if (public_only) {
key_type = PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(key_type);
}
key_bits = psa_get_key_bits(&key_attr);
alg_type = psa_get_key_algorithm(&key_attr);
@ -1485,6 +1494,19 @@ exit:
return ret;
}
int mbedtls_pk_copy_from_psa(mbedtls_svc_key_id_t key_id,
mbedtls_pk_context *pk)
{
return copy_from_psa(key_id, pk, 0);
}
int mbedtls_pk_copy_public_from_psa(mbedtls_svc_key_id_t key_id,
mbedtls_pk_context *pk)
{
return copy_from_psa(key_id, pk, 1);
}
#endif /* MBEDTLS_PSA_CRYPTO_C */
#endif /* MBEDTLS_PK_C */