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lib: wrap crypt API to hide errno usage

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In order to prevent using the global errno, replace it with a static
version and create a wrapper function which returns the error value.

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Steffen Jaeckel 2021-07-08 15:57:34 +02:00 • committed by Tom Rini
parent 26dd993657
commit 29bbe71ccf
8 changed files with 98 additions and 38 deletions
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27
lib/crypt/crypt-sha512.c
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@ -1,10 +1,14 @@
// SPDX-License-Identifier: CC0-1.0
/* Based on libxcrypt v4.4.17-0-g6b110bc */
/* One way encryption based on the SHA512-based Unix crypt implementation.
*
* Written by Ulrich Drepper <drepper at redhat.com> in 2007 [1].
* Modified by Zack Weinberg <zackw at panix.com> in 2017, 2018.
* Composed by Björn Esser <besser82 at fedoraproject.org> in 2018.
* Modified by Björn Esser <besser82 at fedoraproject.org> in 2020.
* Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2020.
* Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2021
* for U-Boot, instead of using the global errno to use a static one
* inside this file.
* To the extent possible under law, the named authors have waived all
* copyright and related or neighboring rights to this work.
*
@ -20,7 +24,7 @@
#include "crypt-port.h"
#include "alg-sha512.h"
#include <errno.h>
#include <linux/errno.h>
#include <stdio.h>
#include <stdlib.h>
@ -69,6 +73,25 @@ static_assert (sizeof (struct sha512_buffer) <= ALG_SPECIFIC_SIZE,
"ALG_SPECIFIC_SIZE is too small for SHA512");
/* Use this instead of including errno.h */
static int errno;
void crypt_sha512crypt_rn(const char *phrase, size_t phr_size,
const char *setting, size_t ARG_UNUSED(set_size),
uint8_t *output, size_t out_size, void *scratch,
size_t scr_size);
int crypt_sha512crypt_rn_wrapped(const char *phrase, size_t phr_size,
const char *setting, size_t set_size,
u8 *output, size_t out_size, void *scratch,
size_t scr_size)
{
errno = 0;
crypt_sha512crypt_rn(phrase, phr_size, setting, set_size, output,
out_size, scratch, scr_size);
return -errno;
}
/* Subroutine of _xcrypt_crypt_sha512crypt_rn: Feed CTX with LEN bytes of a
virtual byte sequence consisting of BLOCK repeated over and over
indefinitely. */