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lib: add crypt subsystem
Add the basic functionality required to support the standard crypt format. The files crypt-sha256.c and crypt-sha512.c originate from libxcrypt and their formatting is therefor retained. The integration is done via a crypt_compare() function in crypt.c. ``` libxcrypt $ git describe --long --always --all tags/v4.4.17-0-g6b110bc ``` 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
Tom Rini
parent
c74675bd90
commit
26dd993657
14 changed files with 881 additions and 0 deletions
13
include/crypt.h
Normal file
13
include/crypt.h
Normal file
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@ -0,0 +1,13 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/* Copyright (C) 2020 Steffen Jaeckel <jaeckel-floss@eyet-services.de> */
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/**
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* Compare should with the processed passphrase.
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*
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* @should The crypt-style string to compare against
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* @passphrase The plaintext passphrase
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* @equal Pointer to an int where the result is stored
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* '0' = unequal
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* '1' = equal
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*/
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void crypt_compare(const char *should, const char *passphrase, int *equal);
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@ -297,6 +297,7 @@ config AES
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source lib/rsa/Kconfig
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source lib/crypto/Kconfig
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source lib/crypt/Kconfig
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config TPM
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bool "Trusted Platform Module (TPM) Support"
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@ -65,6 +65,7 @@ obj-$(CONFIG_HASH) += hash-checksum.o
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obj-$(CONFIG_SHA1) += sha1.o
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obj-$(CONFIG_SHA256) += sha256.o
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obj-$(CONFIG_SHA512_ALGO) += sha512.o
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obj-$(CONFIG_CRYPT_PW) += crypt/
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obj-$(CONFIG_$(SPL_)ZLIB) += zlib/
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obj-$(CONFIG_$(SPL_)ZSTD) += zstd/
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28
lib/crypt/Kconfig
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28
lib/crypt/Kconfig
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@ -0,0 +1,28 @@
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menuconfig CRYPT_PW
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bool "Add crypt support for password-based unlock"
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depends on AUTOBOOT_KEYED && AUTOBOOT_ENCRYPTION
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help
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Enable support for crypt-style hashed passphrases.
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This will then be used as the mechanism of choice to
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verify whether the entered password to unlock the
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console is correct or not.
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if CRYPT_PW
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config CRYPT_PW_SHA256
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bool "Provide sha256crypt"
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select SHA256
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select SHA256_ALGO
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help
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Enables support for the sha256crypt password-hashing algorithm.
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The prefix is "$5$".
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config CRYPT_PW_SHA512
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bool "Provide sha512crypt"
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select SHA512
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select SHA512_ALGO
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help
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Enables support for the sha512crypt password-hashing algorithm.
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The prefix is "$6$".
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endif
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7
lib/crypt/Makefile
Normal file
7
lib/crypt/Makefile
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@ -0,0 +1,7 @@
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (c) 2021, Steffen Jaeckel <jaeckel-floss@eyet-services.de>
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obj-$(CONFIG_CRYPT_PW) += crypt.o
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obj-$(CONFIG_CRYPT_PW_SHA256) += crypt-sha256.o
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obj-$(CONFIG_CRYPT_PW_SHA512) += crypt-sha512.o
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17
lib/crypt/alg-sha256.h
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17
lib/crypt/alg-sha256.h
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@ -0,0 +1,17 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/* Copyright (C) 2020 Steffen Jaeckel <jaeckel-floss@eyet-services.de> */
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#ifndef USE_HOSTCC
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#include "common.h"
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#else
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#include <string.h>
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#endif
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#include "u-boot/sha256.h"
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#define INCLUDE_sha256crypt 1
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#define SHA256_CTX sha256_context
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#define SHA256_Init sha256_starts
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#define SHA256_Update(c, i, l) sha256_update(c, (const void *)i, l)
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#define SHA256_Final(b, c) sha256_finish(c, b)
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17
lib/crypt/alg-sha512.h
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17
lib/crypt/alg-sha512.h
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@ -0,0 +1,17 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/* Copyright (C) 2020 Steffen Jaeckel <jaeckel-floss@eyet-services.de> */
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#ifndef USE_HOSTCC
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#include "common.h"
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#else
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#include <string.h>
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#endif
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#include "u-boot/sha512.h"
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#define INCLUDE_sha512crypt 1
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#define SHA512_CTX sha512_context
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#define SHA512_Init sha512_starts
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#define SHA512_Update(c, i, l) sha512_update(c, (const void *)i, l)
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#define SHA512_Final(b, c) sha512_finish(c, b)
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28
lib/crypt/crypt-port.h
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28
lib/crypt/crypt-port.h
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@ -0,0 +1,28 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/* Copyright (C) 2020 Steffen Jaeckel <jaeckel-floss@eyet-services.de> */
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#include <linux/types.h>
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#include <vsprintf.h>
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#define NO_GENSALT
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#define CRYPT_OUTPUT_SIZE 384
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#define ALG_SPECIFIC_SIZE 8192
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#define ARG_UNUSED(x) (x)
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#define static_assert(a, b) _Static_assert(a, b)
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#define strtoul(cp, endp, base) simple_strtoul(cp, endp, base)
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extern const unsigned char ascii64[65];
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#define b64t ((const char *)ascii64)
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void crypt_sha256crypt_rn(const char *phrase, size_t phr_size,
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const char *setting, size_t ARG_UNUSED(set_size),
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uint8_t *output, size_t out_size, void *scratch,
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size_t scr_size);
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void crypt_sha512crypt_rn(const char *phrase, size_t phr_size,
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const char *setting, size_t ARG_UNUSED(set_size),
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uint8_t *output, size_t out_size, void *scratch,
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size_t scr_size);
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313
lib/crypt/crypt-sha256.c
Normal file
313
lib/crypt/crypt-sha256.c
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@ -0,0 +1,313 @@
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/* One way encryption based on the SHA256-based Unix crypt implementation.
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*
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* Written by Ulrich Drepper <drepper at redhat.com> in 2007 [1].
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* Modified by Zack Weinberg <zackw at panix.com> in 2017, 2018.
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* Composed by Björn Esser <besser82 at fedoraproject.org> in 2018.
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* Modified by Björn Esser <besser82 at fedoraproject.org> in 2020.
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* Modified by Steffen Jaeckel <jaeckel-floss at eyet-services.de> in 2020.
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* To the extent possible under law, the named authors have waived all
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* copyright and related or neighboring rights to this work.
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*
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* See https://creativecommons.org/publicdomain/zero/1.0/ for further
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* details.
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*
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* This file is a modified except from [2], lines 648 up to 909.
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*
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* [1] https://www.akkadia.org/drepper/sha-crypt.html
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* [2] https://www.akkadia.org/drepper/SHA-crypt.txt
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*/
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#include "crypt-port.h"
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#include "alg-sha256.h"
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#if INCLUDE_sha256crypt
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/* Define our magic string to mark salt for SHA256 "encryption"
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replacement. */
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static const char sha256_salt_prefix[] = "$5$";
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/* Prefix for optional rounds specification. */
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static const char sha256_rounds_prefix[] = "rounds=";
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/* Maximum salt string length. */
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#define SALT_LEN_MAX 16
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/* Default number of rounds if not explicitly specified. */
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#define ROUNDS_DEFAULT 5000
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/* Minimum number of rounds. */
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#define ROUNDS_MIN 1000
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/* Maximum number of rounds. */
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#define ROUNDS_MAX 999999999
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/* The maximum possible length of a SHA256-hashed password string,
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including the terminating NUL character. Prefix (including its NUL)
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+ rounds tag ("rounds=$" = "rounds=\0") + strlen(ROUNDS_MAX)
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+ salt (up to SALT_LEN_MAX chars) + '$' + hash (43 chars). */
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#define LENGTH_OF_NUMBER(n) (sizeof #n - 1)
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#define SHA256_HASH_LENGTH \
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(sizeof (sha256_salt_prefix) + sizeof (sha256_rounds_prefix) + \
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LENGTH_OF_NUMBER (ROUNDS_MAX) + SALT_LEN_MAX + 1 + 43)
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static_assert (SHA256_HASH_LENGTH <= CRYPT_OUTPUT_SIZE,
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"CRYPT_OUTPUT_SIZE is too small for SHA256");
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/* A sha256_buffer holds all of the sensitive intermediate data. */
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struct sha256_buffer
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{
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SHA256_CTX ctx;
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uint8_t result[32];
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uint8_t p_bytes[32];
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uint8_t s_bytes[32];
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};
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static_assert (sizeof (struct sha256_buffer) <= ALG_SPECIFIC_SIZE,
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"ALG_SPECIFIC_SIZE is too small for SHA256");
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/* Feed CTX with LEN bytes of a virtual byte sequence consisting of
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BLOCK repeated over and over indefinitely. */
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static void
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SHA256_Update_recycled (SHA256_CTX *ctx,
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unsigned char block[32], size_t len)
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{
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size_t cnt;
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for (cnt = len; cnt >= 32; cnt -= 32)
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SHA256_Update (ctx, block, 32);
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SHA256_Update (ctx, block, cnt);
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}
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void
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crypt_sha256crypt_rn (const char *phrase, size_t phr_size,
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const char *setting, size_t ARG_UNUSED (set_size),
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uint8_t *output, size_t out_size,
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void *scratch, size_t scr_size)
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{
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/* This shouldn't ever happen, but... */
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if (out_size < SHA256_HASH_LENGTH
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|| scr_size < sizeof (struct sha256_buffer))
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{
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errno = ERANGE;
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return;
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}
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struct sha256_buffer *buf = scratch;
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SHA256_CTX *ctx = &buf->ctx;
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uint8_t *result = buf->result;
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uint8_t *p_bytes = buf->p_bytes;
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uint8_t *s_bytes = buf->s_bytes;
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char *cp = (char *)output;
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const char *salt = setting;
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size_t salt_size;
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size_t cnt;
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/* Default number of rounds. */
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size_t rounds = ROUNDS_DEFAULT;
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bool rounds_custom = false;
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/* Find beginning of salt string. The prefix should normally always
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be present. Just in case it is not. */
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if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
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/* Skip salt prefix. */
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salt += sizeof (sha256_salt_prefix) - 1;
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if (strncmp (salt, sha256_rounds_prefix, sizeof (sha256_rounds_prefix) - 1)
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== 0)
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{
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const char *num = salt + sizeof (sha256_rounds_prefix) - 1;
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/* Do not allow an explicit setting of zero rounds, nor of the
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default number of rounds, nor leading zeroes on the rounds. */
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if (!(*num >= '1' && *num <= '9'))
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{
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errno = EINVAL;
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return;
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}
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errno = 0;
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char *endp;
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rounds = strtoul (num, &endp, 10);
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if (endp == num || *endp != '$'
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|| rounds < ROUNDS_MIN
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|| rounds > ROUNDS_MAX
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|| errno)
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{
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errno = EINVAL;
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return;
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}
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salt = endp + 1;
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rounds_custom = true;
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}
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/* The salt ends at the next '$' or the end of the string.
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Ensure ':' does not appear in the salt (it is used as a separator in /etc/passwd).
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Also check for '\n', as in /etc/passwd the whole parameters of the user data must
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be on a single line. */
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salt_size = strcspn (salt, "$:\n");
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if (!(salt[salt_size] == '$' || !salt[salt_size]))
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{
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errno = EINVAL;
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return;
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}
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/* Ensure we do not use more salt than SALT_LEN_MAX. */
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if (salt_size > SALT_LEN_MAX)
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salt_size = SALT_LEN_MAX;
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/* Compute alternate SHA256 sum with input PHRASE, SALT, and PHRASE. The
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final result will be added to the first context. */
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SHA256_Init (ctx);
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/* Add phrase. */
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SHA256_Update (ctx, phrase, phr_size);
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/* Add salt. */
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SHA256_Update (ctx, salt, salt_size);
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/* Add phrase again. */
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SHA256_Update (ctx, phrase, phr_size);
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/* Now get result of this (32 bytes). */
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SHA256_Final (result, ctx);
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/* Prepare for the real work. */
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SHA256_Init (ctx);
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/* Add the phrase string. */
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SHA256_Update (ctx, phrase, phr_size);
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/* The last part is the salt string. This must be at most 8
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characters and it ends at the first `$' character (for
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compatibility with existing implementations). */
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SHA256_Update (ctx, salt, salt_size);
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/* Add for any character in the phrase one byte of the alternate sum. */
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for (cnt = phr_size; cnt > 32; cnt -= 32)
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SHA256_Update (ctx, result, 32);
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SHA256_Update (ctx, result, cnt);
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/* Take the binary representation of the length of the phrase and for every
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1 add the alternate sum, for every 0 the phrase. */
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for (cnt = phr_size; cnt > 0; cnt >>= 1)
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if ((cnt & 1) != 0)
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SHA256_Update (ctx, result, 32);
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else
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SHA256_Update (ctx, phrase, phr_size);
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/* Create intermediate result. */
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SHA256_Final (result, ctx);
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/* Start computation of P byte sequence. */
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SHA256_Init (ctx);
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/* For every character in the password add the entire password. */
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for (cnt = 0; cnt < phr_size; ++cnt)
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SHA256_Update (ctx, phrase, phr_size);
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/* Finish the digest. */
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SHA256_Final (p_bytes, ctx);
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/* Start computation of S byte sequence. */
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SHA256_Init (ctx);
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/* For every character in the password add the entire password. */
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for (cnt = 0; cnt < (size_t) 16 + (size_t) result[0]; ++cnt)
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SHA256_Update (ctx, salt, salt_size);
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/* Finish the digest. */
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SHA256_Final (s_bytes, ctx);
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/* Repeatedly run the collected hash value through SHA256 to burn
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CPU cycles. */
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for (cnt = 0; cnt < rounds; ++cnt)
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{
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/* New context. */
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SHA256_Init (ctx);
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/* Add phrase or last result. */
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if ((cnt & 1) != 0)
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SHA256_Update_recycled (ctx, p_bytes, phr_size);
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else
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SHA256_Update (ctx, result, 32);
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/* Add salt for numbers not divisible by 3. */
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if (cnt % 3 != 0)
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SHA256_Update_recycled (ctx, s_bytes, salt_size);
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/* Add phrase for numbers not divisible by 7. */
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if (cnt % 7 != 0)
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SHA256_Update_recycled (ctx, p_bytes, phr_size);
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/* Add phrase or last result. */
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if ((cnt & 1) != 0)
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SHA256_Update (ctx, result, 32);
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else
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SHA256_Update_recycled (ctx, p_bytes, phr_size);
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/* Create intermediate result. */
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SHA256_Final (result, ctx);
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}
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/* Now we can construct the result string. It consists of four
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parts, one of which is optional. We already know that there
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is sufficient space at CP for the longest possible result string. */
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memcpy (cp, sha256_salt_prefix, sizeof (sha256_salt_prefix) - 1);
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cp += sizeof (sha256_salt_prefix) - 1;
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if (rounds_custom)
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{
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int n = snprintf (cp,
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SHA256_HASH_LENGTH - (sizeof (sha256_salt_prefix) - 1),
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"%s%zu$", sha256_rounds_prefix, rounds);
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cp += n;
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}
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memcpy (cp, salt, salt_size);
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cp += salt_size;
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*cp++ = '$';
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#define b64_from_24bit(B2, B1, B0, N) \
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do { \
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unsigned int w = ((((unsigned int)(B2)) << 16) | \
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(((unsigned int)(B1)) << 8) | \
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((unsigned int)(B0))); \
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int n = (N); \
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while (n-- > 0) \
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{ \
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*cp++ = b64t[w & 0x3f]; \
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w >>= 6; \
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} \
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} while (0)
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b64_from_24bit (result[0], result[10], result[20], 4);
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b64_from_24bit (result[21], result[1], result[11], 4);
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b64_from_24bit (result[12], result[22], result[2], 4);
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b64_from_24bit (result[3], result[13], result[23], 4);
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b64_from_24bit (result[24], result[4], result[14], 4);
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b64_from_24bit (result[15], result[25], result[5], 4);
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b64_from_24bit (result[6], result[16], result[26], 4);
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b64_from_24bit (result[27], result[7], result[17], 4);
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b64_from_24bit (result[18], result[28], result[8], 4);
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b64_from_24bit (result[9], result[19], result[29], 4);
|
||||
b64_from_24bit (0, result[31], result[30], 3);
|
||||
|
||||
*cp = '\0';
|
||||
}
|
||||
|
||||
#ifndef NO_GENSALT
|
||||
|
||||
void
|
||||
gensalt_sha256crypt_rn (unsigned long count,
|
||||
const uint8_t *rbytes, size_t nrbytes,
|
||||
uint8_t *output, size_t output_size)
|
||||
{
|
||||
gensalt_sha_rn ('5', SALT_LEN_MAX, ROUNDS_DEFAULT, ROUNDS_MIN, ROUNDS_MAX,
|
||||
count, rbytes, nrbytes, output, output_size);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#endif
|
||||
328
lib/crypt/crypt-sha512.c
Normal file
328
lib/crypt/crypt-sha512.c
Normal file
|
|
@ -0,0 +1,328 @@
|
|||
/* 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.
|
||||
* To the extent possible under law, the named authors have waived all
|
||||
* copyright and related or neighboring rights to this work.
|
||||
*
|
||||
* See https://creativecommons.org/publicdomain/zero/1.0/ for further
|
||||
* details.
|
||||
*
|
||||
* This file is a modified except from [2], lines 1403 up to 1676.
|
||||
*
|
||||
* [1] https://www.akkadia.org/drepper/sha-crypt.html
|
||||
* [2] https://www.akkadia.org/drepper/SHA-crypt.txt
|
||||
*/
|
||||
|
||||
#include "crypt-port.h"
|
||||
#include "alg-sha512.h"
|
||||
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#if INCLUDE_sha512crypt
|
||||
|
||||
/* Define our magic string to mark salt for SHA512 "encryption"
|
||||
replacement. */
|
||||
static const char sha512_salt_prefix[] = "$6$";
|
||||
|
||||
/* Prefix for optional rounds specification. */
|
||||
static const char sha512_rounds_prefix[] = "rounds=";
|
||||
|
||||
/* Maximum salt string length. */
|
||||
#define SALT_LEN_MAX 16
|
||||
/* Default number of rounds if not explicitly specified. */
|
||||
#define ROUNDS_DEFAULT 5000
|
||||
/* Minimum number of rounds. */
|
||||
#define ROUNDS_MIN 1000
|
||||
/* Maximum number of rounds. */
|
||||
#define ROUNDS_MAX 999999999
|
||||
|
||||
/* The maximum possible length of a SHA512-hashed password string,
|
||||
including the terminating NUL character. Prefix (including its NUL)
|
||||
+ rounds tag ("rounds=$" = "rounds=\0") + strlen(ROUNDS_MAX)
|
||||
+ salt (up to SALT_LEN_MAX chars) + '$' + hash (86 chars). */
|
||||
|
||||
#define LENGTH_OF_NUMBER(n) (sizeof #n - 1)
|
||||
|
||||
#define SHA512_HASH_LENGTH \
|
||||
(sizeof (sha512_salt_prefix) + sizeof (sha512_rounds_prefix) + \
|
||||
LENGTH_OF_NUMBER (ROUNDS_MAX) + SALT_LEN_MAX + 1 + 86)
|
||||
|
||||
static_assert (SHA512_HASH_LENGTH <= CRYPT_OUTPUT_SIZE,
|
||||
"CRYPT_OUTPUT_SIZE is too small for SHA512");
|
||||
|
||||
/* A sha512_buffer holds all of the sensitive intermediate data. */
|
||||
struct sha512_buffer
|
||||
{
|
||||
SHA512_CTX ctx;
|
||||
uint8_t result[64];
|
||||
uint8_t p_bytes[64];
|
||||
uint8_t s_bytes[64];
|
||||
};
|
||||
|
||||
static_assert (sizeof (struct sha512_buffer) <= ALG_SPECIFIC_SIZE,
|
||||
"ALG_SPECIFIC_SIZE is too small for SHA512");
|
||||
|
||||
|
||||
/* Subroutine of _xcrypt_crypt_sha512crypt_rn: Feed CTX with LEN bytes of a
|
||||
virtual byte sequence consisting of BLOCK repeated over and over
|
||||
indefinitely. */
|
||||
static void
|
||||
sha512_process_recycled_bytes (unsigned char block[64], size_t len,
|
||||
SHA512_CTX *ctx)
|
||||
{
|
||||
size_t cnt;
|
||||
for (cnt = len; cnt >= 64; cnt -= 64)
|
||||
SHA512_Update (ctx, block, 64);
|
||||
SHA512_Update (ctx, block, cnt);
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
/* This shouldn't ever happen, but... */
|
||||
if (out_size < SHA512_HASH_LENGTH
|
||||
|| scr_size < sizeof (struct sha512_buffer))
|
||||
{
|
||||
errno = ERANGE;
|
||||
return;
|
||||
}
|
||||
|
||||
struct sha512_buffer *buf = scratch;
|
||||
SHA512_CTX *ctx = &buf->ctx;
|
||||
uint8_t *result = buf->result;
|
||||
uint8_t *p_bytes = buf->p_bytes;
|
||||
uint8_t *s_bytes = buf->s_bytes;
|
||||
char *cp = (char *)output;
|
||||
const char *salt = setting;
|
||||
|
||||
size_t salt_size;
|
||||
size_t cnt;
|
||||
/* Default number of rounds. */
|
||||
size_t rounds = ROUNDS_DEFAULT;
|
||||
bool rounds_custom = false;
|
||||
|
||||
/* Find beginning of salt string. The prefix should normally always
|
||||
be present. Just in case it is not. */
|
||||
if (strncmp (sha512_salt_prefix, salt, sizeof (sha512_salt_prefix) - 1) == 0)
|
||||
/* Skip salt prefix. */
|
||||
salt += sizeof (sha512_salt_prefix) - 1;
|
||||
|
||||
if (strncmp (salt, sha512_rounds_prefix, sizeof (sha512_rounds_prefix) - 1)
|
||||
== 0)
|
||||
{
|
||||
const char *num = salt + sizeof (sha512_rounds_prefix) - 1;
|
||||
/* Do not allow an explicit setting of zero rounds, nor of the
|
||||
default number of rounds, nor leading zeroes on the rounds. */
|
||||
if (!(*num >= '1' && *num <= '9'))
|
||||
{
|
||||
errno = EINVAL;
|
||||
return;
|
||||
}
|
||||
|
||||
errno = 0;
|
||||
char *endp;
|
||||
rounds = strtoul (num, &endp, 10);
|
||||
if (endp == num || *endp != '$'
|
||||
|| rounds < ROUNDS_MIN
|
||||
|| rounds > ROUNDS_MAX
|
||||
|| errno)
|
||||
{
|
||||
errno = EINVAL;
|
||||
return;
|
||||
}
|
||||
salt = endp + 1;
|
||||
rounds_custom = true;
|
||||
}
|
||||
|
||||
/* The salt ends at the next '$' or the end of the string.
|
||||
Ensure ':' does not appear in the salt (it is used as a separator in /etc/passwd).
|
||||
Also check for '\n', as in /etc/passwd the whole parameters of the user data must
|
||||
be on a single line. */
|
||||
salt_size = strcspn (salt, "$:\n");
|
||||
if (!(salt[salt_size] == '$' || !salt[salt_size]))
|
||||
{
|
||||
errno = EINVAL;
|
||||
return;
|
||||
}
|
||||
|
||||
/* Ensure we do not use more salt than SALT_LEN_MAX. */
|
||||
if (salt_size > SALT_LEN_MAX)
|
||||
salt_size = SALT_LEN_MAX;
|
||||
|
||||
/* Compute alternate SHA512 sum with input PHRASE, SALT, and PHRASE. The
|
||||
final result will be added to the first context. */
|
||||
SHA512_Init (ctx);
|
||||
|
||||
/* Add phrase. */
|
||||
SHA512_Update (ctx, phrase, phr_size);
|
||||
|
||||
/* Add salt. */
|
||||
SHA512_Update (ctx, salt, salt_size);
|
||||
|
||||
/* Add phrase again. */
|
||||
SHA512_Update (ctx, phrase, phr_size);
|
||||
|
||||
/* Now get result of this (64 bytes) and add it to the other
|
||||
context. */
|
||||
SHA512_Final (result, ctx);
|
||||
|
||||
/* Prepare for the real work. */
|
||||
SHA512_Init (ctx);
|
||||
|
||||
/* Add the phrase string. */
|
||||
SHA512_Update (ctx, phrase, phr_size);
|
||||
|
||||
/* The last part is the salt string. This must be at most 8
|
||||
characters and it ends at the first `$' character (for
|
||||
compatibility with existing implementations). */
|
||||
SHA512_Update (ctx, salt, salt_size);
|
||||
|
||||
/* Add for any character in the phrase one byte of the alternate sum. */
|
||||
for (cnt = phr_size; cnt > 64; cnt -= 64)
|
||||
SHA512_Update (ctx, result, 64);
|
||||
SHA512_Update (ctx, result, cnt);
|
||||
|
||||
/* Take the binary representation of the length of the phrase and for every
|
||||
1 add the alternate sum, for every 0 the phrase. */
|
||||
for (cnt = phr_size; cnt > 0; cnt >>= 1)
|
||||
if ((cnt & 1) != 0)
|
||||
SHA512_Update (ctx, result, 64);
|
||||
else
|
||||
SHA512_Update (ctx, phrase, phr_size);
|
||||
|
||||
/* Create intermediate result. */
|
||||
SHA512_Final (result, ctx);
|
||||
|
||||
/* Start computation of P byte sequence. */
|
||||
SHA512_Init (ctx);
|
||||
|
||||
/* For every character in the password add the entire password. */
|
||||
for (cnt = 0; cnt < phr_size; ++cnt)
|
||||
SHA512_Update (ctx, phrase, phr_size);
|
||||
|
||||
/* Finish the digest. */
|
||||
SHA512_Final (p_bytes, ctx);
|
||||
|
||||
/* Start computation of S byte sequence. */
|
||||
SHA512_Init (ctx);
|
||||
|
||||
/* For every character in the password add the entire password. */
|
||||
for (cnt = 0; cnt < (size_t) 16 + (size_t) result[0]; ++cnt)
|
||||
SHA512_Update (ctx, salt, salt_size);
|
||||
|
||||
/* Finish the digest. */
|
||||
SHA512_Final (s_bytes, ctx);
|
||||
|
||||
/* Repeatedly run the collected hash value through SHA512 to burn
|
||||
CPU cycles. */
|
||||
for (cnt = 0; cnt < rounds; ++cnt)
|
||||
{
|
||||
/* New context. */
|
||||
SHA512_Init (ctx);
|
||||
|
||||
/* Add phrase or last result. */
|
||||
if ((cnt & 1) != 0)
|
||||
sha512_process_recycled_bytes (p_bytes, phr_size, ctx);
|
||||
else
|
||||
SHA512_Update (ctx, result, 64);
|
||||
|
||||
/* Add salt for numbers not divisible by 3. */
|
||||
if (cnt % 3 != 0)
|
||||
sha512_process_recycled_bytes (s_bytes, salt_size, ctx);
|
||||
|
||||
/* Add phrase for numbers not divisible by 7. */
|
||||
if (cnt % 7 != 0)
|
||||
sha512_process_recycled_bytes (p_bytes, phr_size, ctx);
|
||||
|
||||
/* Add phrase or last result. */
|
||||
if ((cnt & 1) != 0)
|
||||
SHA512_Update (ctx, result, 64);
|
||||
else
|
||||
sha512_process_recycled_bytes (p_bytes, phr_size, ctx);
|
||||
|
||||
/* Create intermediate result. */
|
||||
SHA512_Final (result, ctx);
|
||||
}
|
||||
|
||||
/* Now we can construct the result string. It consists of four
|
||||
parts, one of which is optional. We already know that buflen is
|
||||
at least sha512_hash_length, therefore none of the string bashing
|
||||
below can overflow the buffer. */
|
||||
|
||||
memcpy (cp, sha512_salt_prefix, sizeof (sha512_salt_prefix) - 1);
|
||||
cp += sizeof (sha512_salt_prefix) - 1;
|
||||
|
||||
if (rounds_custom)
|
||||
{
|
||||
int n = snprintf (cp,
|
||||
SHA512_HASH_LENGTH - (sizeof (sha512_salt_prefix) - 1),
|
||||
"%s%zu$", sha512_rounds_prefix, rounds);
|
||||
cp += n;
|
||||
}
|
||||
|
||||
memcpy (cp, salt, salt_size);
|
||||
cp += salt_size;
|
||||
*cp++ = '$';
|
||||
|
||||
#define b64_from_24bit(B2, B1, B0, N) \
|
||||
do { \
|
||||
unsigned int w = ((((unsigned int)(B2)) << 16) | \
|
||||
(((unsigned int)(B1)) << 8) | \
|
||||
((unsigned int)(B0))); \
|
||||
int n = (N); \
|
||||
while (n-- > 0) \
|
||||
{ \
|
||||
*cp++ = b64t[w & 0x3f]; \
|
||||
w >>= 6; \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
b64_from_24bit (result[0], result[21], result[42], 4);
|
||||
b64_from_24bit (result[22], result[43], result[1], 4);
|
||||
b64_from_24bit (result[44], result[2], result[23], 4);
|
||||
b64_from_24bit (result[3], result[24], result[45], 4);
|
||||
b64_from_24bit (result[25], result[46], result[4], 4);
|
||||
b64_from_24bit (result[47], result[5], result[26], 4);
|
||||
b64_from_24bit (result[6], result[27], result[48], 4);
|
||||
b64_from_24bit (result[28], result[49], result[7], 4);
|
||||
b64_from_24bit (result[50], result[8], result[29], 4);
|
||||
b64_from_24bit (result[9], result[30], result[51], 4);
|
||||
b64_from_24bit (result[31], result[52], result[10], 4);
|
||||
b64_from_24bit (result[53], result[11], result[32], 4);
|
||||
b64_from_24bit (result[12], result[33], result[54], 4);
|
||||
b64_from_24bit (result[34], result[55], result[13], 4);
|
||||
b64_from_24bit (result[56], result[14], result[35], 4);
|
||||
b64_from_24bit (result[15], result[36], result[57], 4);
|
||||
b64_from_24bit (result[37], result[58], result[16], 4);
|
||||
b64_from_24bit (result[59], result[17], result[38], 4);
|
||||
b64_from_24bit (result[18], result[39], result[60], 4);
|
||||
b64_from_24bit (result[40], result[61], result[19], 4);
|
||||
b64_from_24bit (result[62], result[20], result[41], 4);
|
||||
b64_from_24bit (0, 0, result[63], 2);
|
||||
|
||||
*cp = '\0';
|
||||
}
|
||||
|
||||
#ifndef NO_GENSALT
|
||||
|
||||
void
|
||||
gensalt_sha512crypt_rn (unsigned long count,
|
||||
const uint8_t *rbytes, size_t nrbytes,
|
||||
uint8_t *output, size_t output_size)
|
||||
{
|
||||
gensalt_sha_rn ('6', SALT_LEN_MAX, ROUNDS_DEFAULT, ROUNDS_MIN, ROUNDS_MAX,
|
||||
count, rbytes, nrbytes, output, output_size);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#endif
|
||||
73
lib/crypt/crypt.c
Normal file
73
lib/crypt/crypt.c
Normal file
|
|
@ -0,0 +1,73 @@
|
|||
// 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 void (*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;
|
||||
}
|
||||
|
||||
void crypt_compare(const char *should, const char *passphrase, int *equal)
|
||||
{
|
||||
u8 output[CRYPT_OUTPUT_SIZE], scratch[ALG_SPECIFIC_SIZE];
|
||||
size_t n;
|
||||
struct {
|
||||
const char *prefix;
|
||||
crypt_fn crypt;
|
||||
} crypt_algos[] = {
|
||||
#if defined(CONFIG_CRYPT_PW_SHA256)
|
||||
{ "$5$", crypt_sha256crypt_rn },
|
||||
#endif
|
||||
#if defined(CONFIG_CRYPT_PW_SHA512)
|
||||
{ "$6$", crypt_sha512crypt_rn },
|
||||
#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;
|
||||
|
||||
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 (errno == ERANGE || errno == EINVAL)
|
||||
return;
|
||||
|
||||
equals_constant_time(should, output, strlen((const char *)output),
|
||||
equal);
|
||||
|
||||
memset(scratch, 0, sizeof(scratch));
|
||||
memset(output, 0, sizeof(output));
|
||||
}
|
||||
10
test/Kconfig
10
test/Kconfig
|
|
@ -38,6 +38,16 @@ config UT_LIB_ASN1
|
|||
Enables a test which exercises asn1 compiler and decoder function
|
||||
via various parsers.
|
||||
|
||||
config UT_LIB_CRYPT
|
||||
bool "Unit test for crypt-style password hashing"
|
||||
depends on !SPL && AUTOBOOT_KEYED && AUTOBOOT_ENCRYPTION
|
||||
default y
|
||||
select CRYPT_PW
|
||||
select CRYPT_PW_SHA256
|
||||
select CRYPT_PW_SHA512
|
||||
help
|
||||
Enables a test for the crypt-style password hash functions.
|
||||
|
||||
config UT_LIB_RSA
|
||||
bool "Unit test for rsa_verify() function"
|
||||
depends on RSA
|
||||
|
|
|
|||
|
|
@ -17,3 +17,4 @@ obj-$(CONFIG_UT_LIB_ASN1) += asn1.o
|
|||
obj-$(CONFIG_UT_LIB_RSA) += rsa.o
|
||||
obj-$(CONFIG_AES) += test_aes.o
|
||||
obj-$(CONFIG_GETOPT) += getopt.o
|
||||
obj-$(CONFIG_UT_LIB_CRYPT) += test_crypt.o
|
||||
|
|
|
|||
44
test/lib/test_crypt.c
Normal file
44
test/lib/test_crypt.c
Normal file
|
|
@ -0,0 +1,44 @@
|
|||
// SPDX-License-Identifier: GPL-2.0+
|
||||
/*
|
||||
* Copyright (c) 2021 Steffen Jaeckel
|
||||
*
|
||||
* Unit test for crypt-style password hashing
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <test/lib.h>
|
||||
#include <test/test.h>
|
||||
#include <test/ut.h>
|
||||
|
||||
#include <crypt.h>
|
||||
|
||||
/**
|
||||
* lib_crypt() - unit test for crypt-style password hashing
|
||||
*
|
||||
* @uts: unit test state
|
||||
* Return: 0 = success, 1 = failure
|
||||
*/
|
||||
static int lib_crypt(struct unit_test_state *uts)
|
||||
{
|
||||
int equals = 0;
|
||||
|
||||
if (IS_ENABLED(CONFIG_CRYPT_PW_SHA256)) {
|
||||
crypt_compare(
|
||||
"$5$rounds=640000$TM4lL4zXDG7F4aRX$JM7a9wmvodnA0WasjTztj6mxg.KVuk6doQ/eBhdcapB",
|
||||
"password", &equals);
|
||||
ut_assertf(equals == 1,
|
||||
"crypt-sha256 password hash didn't match\n");
|
||||
}
|
||||
equals = 0;
|
||||
if (IS_ENABLED(CONFIG_CRYPT_PW_SHA512)) {
|
||||
crypt_compare(
|
||||
"$6$rounds=640000$fCTP1F0N5JLq2eND$z5EzK5KZJA9JnOaj5d1Gg/2v6VqFOQJ3bVekWuCPauabutBt/8qzV1exJnytUyhbq3H0bSBXtodwNbtGEi/Tm/",
|
||||
"password", &equals);
|
||||
ut_assertf(equals == 1,
|
||||
"crypt-sha512 password hash didn't match\n");
|
||||
}
|
||||
|
||||
return CMD_RET_SUCCESS;
|
||||
}
|
||||
|
||||
LIB_TEST(lib_crypt, 0);
|
||||
Loading…
Reference in a new issue