/* Export the environment and generate CRC for it. */
int env_export(env_t *env_out)
{
char *res;
ssize_t len;
int ret;
res = (char *)env_out->data;
len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
if (len < 0) {
error("Cannot export environment: errno = %d\n", errno);
return 1;
}
/* Encrypt the env if desired. */
ret = env_aes_cbc_crypt(env_out, 1);
if (ret)
return ret;
env_out->crc = crc32(0, env_out->data, ENV_SIZE);
#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
env_out->flags = ++env_flags; /* increase the serial */
#endif
return 0;
}
/* Emport the environment and generate CRC for it. */
int env_export(env_t *env_out)
{
char *res;
ssize_t len;
int ret;
res = (char *)env_out->data;
len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
if (len < 0) {
error("Cannot export environment: errno = %d\n", errno);
return 1;
}
/* Encrypt the env if desired. */
ret = env_aes_cbc_crypt(env_out, 1);
if (ret)
return ret;
env_out->crc = crc32(0, env_out->data, ENV_SIZE);
return 0;
}
/*
* Check if CRC is valid and (if yes) import the environment.
* Note that "buf" may or may not be aligned.
*/
int env_import(const char *buf, int check)
{
env_t *ep = (env_t *)buf;
int ret;
if (check) {
uint32_t crc;
memcpy(&crc, &ep->crc, sizeof(crc));
if (crc32(0, ep->data, ENV_SIZE) != crc) {
set_default_env("!bad CRC");
return 0;
}
}
/* Decrypt the env if desired. */
ret = env_aes_cbc_crypt(ep, 0);
if (ret) {
error("Failed to decrypt env!\n");
set_default_env("!import failed");
return ret;
}
if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
0, NULL)) {
gd->flags |= GD_FLG_ENV_READY;
return 1;
}
error("Cannot import environment: errno = %d\n", errno);
set_default_env("!import failed");
return 0;
}