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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (C) Foundries Ltd. 2020 - All Rights Reserved
* Author: Jorge Ramirez <jorge@foundries.io>
*/
#include <crypto/crypto.h>
#include <se050.h>
#include <se050_utils.h>
#include <string.h>
#include <util.h>
/* exp: minimal amount of transient memory required to generate an RSA key */
#define TRANSIENT_MEMORY_THRESHOLD 0x140
#define NBR_OID ((uint32_t)(OID_MAX - OID_MIN))
#define IS_WATERMARKED(x) (((x) & WATERMARKED(0)) == WATERMARKED(0))
static void delete_transient_objects(void)
{
Se05xSession_t *ctx = NULL;
uint8_t more = kSE05x_MoreIndicator_NA;
uint8_t *list = NULL;
size_t len = 1024;
smStatus_t status = SM_NOT_OK;
uint16_t offset = 0;
uint32_t id = 0;
size_t i = 0;
if (!se050_session)
return;
ctx = &se050_session->s_ctx;
list = calloc(1, len);
if (!list)
return;
do {
status = Se05x_API_ReadIDList(ctx, offset, 0xFF, &more,
list, &len);
if (status != SM_OK)
break;
offset = len;
for (i = 0; i < len; i += 4) {
id = (list[i + 0] << (3 * 8)) |
(list[i + 1] << (2 * 8)) |
(list[i + 2] << (1 * 8)) |
(list[i + 3] << (0 * 8));
if (id >= OID_MAX || id == 0)
continue;
if (id & BIT(0))
Se05x_API_DeleteSecureObject(ctx, id);
}
} while (more == kSE05x_MoreIndicator_MORE);
free(list);
}
static sss_status_t generate_oid(sss_key_object_mode_t mode, uint32_t *val)
{
uint32_t oid = OID_MIN;
uint32_t random = 0;
size_t i = 0;
for (i = 0; i < NBR_OID; i++) {
if (crypto_rng_read(&random, sizeof(random)))
return kStatus_SSS_Fail;
oid = OID_MIN + (random & OID_MAX);
if (oid > OID_MAX)
continue;
if (mode == kKeyObject_Mode_Transient)
oid |= BIT(0);
else
oid &= ~BIT(0);
if (!se050_key_exists(oid, &se050_session->s_ctx)) {
*val = oid;
return kStatus_SSS_Success;
}
}
return kStatus_SSS_Fail;
}
sss_status_t se050_get_oid(sss_key_object_mode_t mode, uint32_t *val)
{
sss_status_t status = kStatus_SSS_Success;
uint16_t mem_t = 0;
if (!val)
return kStatus_SSS_Fail;
status = se050_get_free_memory(&se050_session->s_ctx, &mem_t,
kSE05x_MemoryType_TRANSIENT_DESELECT);
if (status != kStatus_SSS_Success)
return kStatus_SSS_Fail;
if (mem_t < TRANSIENT_MEMORY_THRESHOLD)
delete_transient_objects();
return generate_oid(mode, val);
}
static uint32_t se050_key(uint64_t key)
{
uint32_t oid = (uint32_t)key;
if (!IS_WATERMARKED(key))
return 0;
if (oid < OID_MIN || oid > OID_MAX)
return 0;
return oid;
}
uint32_t se050_rsa_keypair_from_nvm(struct rsa_keypair *key)
{
uint64_t key_id = 0;
if (!key)
return 0;
if (crypto_bignum_num_bytes(key->d) != sizeof(uint64_t))
return 0;
crypto_bignum_bn2bin(key->d, (uint8_t *)&key_id);
return se050_key(key_id);
}
uint32_t se050_ecc_keypair_from_nvm(struct ecc_keypair *key)
{
uint64_t key_id = 0;
if (!key)
return 0;
if (crypto_bignum_num_bytes(key->d) != sizeof(uint64_t))
return 0;
crypto_bignum_bn2bin(key->d, (uint8_t *)&key_id);
return se050_key(key_id);
}
uint64_t se050_generate_private_key(uint32_t oid)
{
return WATERMARKED(oid);
}
void se050_refcount_init_ctx(uint8_t **cnt)
{
if (!*cnt) {
*cnt = calloc(1, sizeof(uint8_t));
if (*cnt)
**cnt = 1;
else
EMSG("can't allocate refcount");
} else {
**cnt = **cnt + 1;
}
}
int se050_refcount_final_ctx(uint8_t *cnt)
{
if (!cnt)
return 1;
if (!*cnt) {
free(cnt);
return 1;
}
*cnt = *cnt - 1;
return 0;
}
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