mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 18:53:06 +00:00
29bbe71ccf
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>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/* Copyright (C) 2020 Steffen Jaeckel <jaeckel-floss@eyet-services.de> */
|
|
|
|
#include <common.h>
|
|
#include <crypt.h>
|
|
#include "crypt-port.h"
|
|
|
|
typedef int (*crypt_fn)(const char *, size_t, const char *, size_t, uint8_t *,
|
|
size_t, void *, size_t);
|
|
|
|
const unsigned char ascii64[65] =
|
|
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
|
|
|
|
static void equals_constant_time(const void *a_, const void *b_, size_t len,
|
|
int *equal)
|
|
{
|
|
u8 ret = 0;
|
|
const u8 *a = a_, *b = b_;
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++)
|
|
ret |= a[i] ^ b[i];
|
|
|
|
ret |= ret >> 4;
|
|
ret |= ret >> 2;
|
|
ret |= ret >> 1;
|
|
ret &= 1;
|
|
|
|
*equal = ret ^ 1;
|
|
}
|
|
|
|
int crypt_compare(const char *should, const char *passphrase, int *equal)
|
|
{
|
|
u8 output[CRYPT_OUTPUT_SIZE], scratch[ALG_SPECIFIC_SIZE];
|
|
size_t n;
|
|
int err;
|
|
struct {
|
|
const char *prefix;
|
|
crypt_fn crypt;
|
|
} crypt_algos[] = {
|
|
#if defined(CONFIG_CRYPT_PW_SHA256)
|
|
{ "$5$", crypt_sha256crypt_rn_wrapped },
|
|
#endif
|
|
#if defined(CONFIG_CRYPT_PW_SHA512)
|
|
{ "$6$", crypt_sha512crypt_rn_wrapped },
|
|
#endif
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
*equal = 0;
|
|
|
|
for (n = 0; n < ARRAY_SIZE(crypt_algos); ++n) {
|
|
if (!crypt_algos[n].prefix)
|
|
continue;
|
|
if (strncmp(should, crypt_algos[n].prefix, 3) == 0)
|
|
break;
|
|
}
|
|
|
|
if (n >= ARRAY_SIZE(crypt_algos))
|
|
return -EINVAL;
|
|
|
|
err = crypt_algos[n].crypt(passphrase, strlen(passphrase), should, 0,
|
|
output, sizeof(output), scratch,
|
|
sizeof(scratch));
|
|
/* early return on error, nothing really happened inside the crypt() function */
|
|
if (err)
|
|
return err;
|
|
|
|
equals_constant_time(should, output, strlen((const char *)output),
|
|
equal);
|
|
|
|
memset(scratch, 0, sizeof(scratch));
|
|
memset(output, 0, sizeof(output));
|
|
|
|
return 0;
|
|
}
|