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net/rxrpc: Add local FCrypt-PCBC implementation

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Add a local implementation of FCrypt-PCBC encryption and decryption.
This will be used instead of the crypto API one, allowing the crypto API
one to be removed.  It will also simplify rxkad.c quite a bit.

A KUnit test is included.  The FCrypt-PCBC test vectors are borrowed
from the existing ones in crypto/testmgr.h.  Note that this adds the
first KUnit test for net/rxrpc/, which previously had no KUnit tests.

The FCrypt code is based on crypto/fcrypt.c, but I simplified it a bit.
The PCBC part is straightforward and I just wrote it from scratch.

Tested with:

    kunit.py run --kunitconfig net/rxrpc/

Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
Link: https://patch.msgid.link/20260522050740.84561-2-ebiggers@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Biggers
2026-05-22 00:07:32 -05:00
committed by Jakub Kicinski
parent 3abbe30231
commit f10e73dffd
7 changed files with 493 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/rxrpc/.kunitconfig Normal file
View File

@@ -0,0 +1,6 @@
CONFIG_KUNIT=y
CONFIG_NET=y
CONFIG_INET=y
CONFIG_AF_RXRPC=y
CONFIG_RXKAD=y
CONFIG_AF_RXRPC_KUNIT_TEST=y

7
net/rxrpc/Kconfig
View File

@@ -97,4 +97,11 @@ config RXPERF
incoming calls from the rxperf program (an example of which can be
found in OpenAFS).
config AF_RXRPC_KUNIT_TEST
tristate "RxRPC crypto KUnit test" if !KUNIT_ALL_TESTS
depends on KUNIT && RXKAD
default KUNIT_ALL_TESTS
help
Enable the KUnit test suite for RxRPC's crypto routines.
endif

3
net/rxrpc/Makefile
View File

@@ -38,7 +38,7 @@ rxrpc-y := \
utils.o
rxrpc-$(CONFIG_PROC_FS) += proc.o
rxrpc-$(CONFIG_RXKAD) += rxkad.o
rxrpc-$(CONFIG_RXKAD) += rxkad.o fcrypt.o
rxrpc-$(CONFIG_SYSCTL) += sysctl.o
rxrpc-$(CONFIG_RXGK) += \
rxgk.o \
@@ -46,3 +46,4 @@ rxrpc-$(CONFIG_RXGK) += \
rxgk_kdf.o
obj-$(CONFIG_RXPERF) += rxperf.o
obj-$(CONFIG_KUNIT) += tests/

14
net/rxrpc/ar-internal.h
View File

@@ -15,6 +15,12 @@
#include <keys/rxrpc-type.h>
#include "protocol.h"
#define FCRYPT_ROUNDS 16
struct fcrypt_key {
__be32 sched[FCRYPT_ROUNDS];
};
#define FCRYPT_BSIZE 8
struct rxrpc_crypt {
union {
@@ -23,6 +29,14 @@ struct rxrpc_crypt {
};
} __attribute__((aligned(8)));
void fcrypt_preparekey(struct fcrypt_key *key, const u8 raw_key[FCRYPT_BSIZE]);
void fcrypt_pcbc_encrypt(const struct fcrypt_key *key,
const u8 iv[FCRYPT_BSIZE], const void *src, void *dst,
size_t nblocks);
void fcrypt_pcbc_decrypt(const struct fcrypt_key *key,
const u8 iv[FCRYPT_BSIZE], const void *src, void *dst,
size_t nblocks);
#define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
#define rxrpc_queue_delayed_work(WS,D) \
queue_delayed_work(rxrpc_workqueue, (WS), (D))

352
net/rxrpc/fcrypt.c Normal file
View File

@@ -0,0 +1,352 @@
/* FCrypt encryption algorithm
*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Based on code:
*
* Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <asm/byteorder.h>
#include <kunit/visibility.h>
#include <linux/export.h>
#include <linux/unaligned.h>
#include "ar-internal.h"
/*
* Sboxes for Feistel network derived from
* /afs/transarc.com/public/afsps/afs.rel31b.export-src/rxkad/sboxes.h
*/
#undef Z
#define Z(x) cpu_to_be32(x << 3)
static const __be32 sbox0[256] = {
Z(0xea), Z(0x7f), Z(0xb2), Z(0x64), Z(0x9d), Z(0xb0), Z(0xd9), Z(0x11),
Z(0xcd), Z(0x86), Z(0x86), Z(0x91), Z(0x0a), Z(0xb2), Z(0x93), Z(0x06),
Z(0x0e), Z(0x06), Z(0xd2), Z(0x65), Z(0x73), Z(0xc5), Z(0x28), Z(0x60),
Z(0xf2), Z(0x20), Z(0xb5), Z(0x38), Z(0x7e), Z(0xda), Z(0x9f), Z(0xe3),
Z(0xd2), Z(0xcf), Z(0xc4), Z(0x3c), Z(0x61), Z(0xff), Z(0x4a), Z(0x4a),
Z(0x35), Z(0xac), Z(0xaa), Z(0x5f), Z(0x2b), Z(0xbb), Z(0xbc), Z(0x53),
Z(0x4e), Z(0x9d), Z(0x78), Z(0xa3), Z(0xdc), Z(0x09), Z(0x32), Z(0x10),
Z(0xc6), Z(0x6f), Z(0x66), Z(0xd6), Z(0xab), Z(0xa9), Z(0xaf), Z(0xfd),
Z(0x3b), Z(0x95), Z(0xe8), Z(0x34), Z(0x9a), Z(0x81), Z(0x72), Z(0x80),
Z(0x9c), Z(0xf3), Z(0xec), Z(0xda), Z(0x9f), Z(0x26), Z(0x76), Z(0x15),
Z(0x3e), Z(0x55), Z(0x4d), Z(0xde), Z(0x84), Z(0xee), Z(0xad), Z(0xc7),
Z(0xf1), Z(0x6b), Z(0x3d), Z(0xd3), Z(0x04), Z(0x49), Z(0xaa), Z(0x24),
Z(0x0b), Z(0x8a), Z(0x83), Z(0xba), Z(0xfa), Z(0x85), Z(0xa0), Z(0xa8),
Z(0xb1), Z(0xd4), Z(0x01), Z(0xd8), Z(0x70), Z(0x64), Z(0xf0), Z(0x51),
Z(0xd2), Z(0xc3), Z(0xa7), Z(0x75), Z(0x8c), Z(0xa5), Z(0x64), Z(0xef),
Z(0x10), Z(0x4e), Z(0xb7), Z(0xc6), Z(0x61), Z(0x03), Z(0xeb), Z(0x44),
Z(0x3d), Z(0xe5), Z(0xb3), Z(0x5b), Z(0xae), Z(0xd5), Z(0xad), Z(0x1d),
Z(0xfa), Z(0x5a), Z(0x1e), Z(0x33), Z(0xab), Z(0x93), Z(0xa2), Z(0xb7),
Z(0xe7), Z(0xa8), Z(0x45), Z(0xa4), Z(0xcd), Z(0x29), Z(0x63), Z(0x44),
Z(0xb6), Z(0x69), Z(0x7e), Z(0x2e), Z(0x62), Z(0x03), Z(0xc8), Z(0xe0),
Z(0x17), Z(0xbb), Z(0xc7), Z(0xf3), Z(0x3f), Z(0x36), Z(0xba), Z(0x71),
Z(0x8e), Z(0x97), Z(0x65), Z(0x60), Z(0x69), Z(0xb6), Z(0xf6), Z(0xe6),
Z(0x6e), Z(0xe0), Z(0x81), Z(0x59), Z(0xe8), Z(0xaf), Z(0xdd), Z(0x95),
Z(0x22), Z(0x99), Z(0xfd), Z(0x63), Z(0x19), Z(0x74), Z(0x61), Z(0xb1),
Z(0xb6), Z(0x5b), Z(0xae), Z(0x54), Z(0xb3), Z(0x70), Z(0xff), Z(0xc6),
Z(0x3b), Z(0x3e), Z(0xc1), Z(0xd7), Z(0xe1), Z(0x0e), Z(0x76), Z(0xe5),
Z(0x36), Z(0x4f), Z(0x59), Z(0xc7), Z(0x08), Z(0x6e), Z(0x82), Z(0xa6),
Z(0x93), Z(0xc4), Z(0xaa), Z(0x26), Z(0x49), Z(0xe0), Z(0x21), Z(0x64),
Z(0x07), Z(0x9f), Z(0x64), Z(0x81), Z(0x9c), Z(0xbf), Z(0xf9), Z(0xd1),
Z(0x43), Z(0xf8), Z(0xb6), Z(0xb9), Z(0xf1), Z(0x24), Z(0x75), Z(0x03),
Z(0xe4), Z(0xb0), Z(0x99), Z(0x46), Z(0x3d), Z(0xf5), Z(0xd1), Z(0x39),
Z(0x72), Z(0x12), Z(0xf6), Z(0xba), Z(0x0c), Z(0x0d), Z(0x42), Z(0x2e)
};
#undef Z
#define Z(x) cpu_to_be32(((x & 0x1f) << 27) | (x >> 5))
static const __be32 sbox1[256] = {
Z(0x77), Z(0x14), Z(0xa6), Z(0xfe), Z(0xb2), Z(0x5e), Z(0x8c), Z(0x3e),
Z(0x67), Z(0x6c), Z(0xa1), Z(0x0d), Z(0xc2), Z(0xa2), Z(0xc1), Z(0x85),
Z(0x6c), Z(0x7b), Z(0x67), Z(0xc6), Z(0x23), Z(0xe3), Z(0xf2), Z(0x89),
Z(0x50), Z(0x9c), Z(0x03), Z(0xb7), Z(0x73), Z(0xe6), Z(0xe1), Z(0x39),
Z(0x31), Z(0x2c), Z(0x27), Z(0x9f), Z(0xa5), Z(0x69), Z(0x44), Z(0xd6),
Z(0x23), Z(0x83), Z(0x98), Z(0x7d), Z(0x3c), Z(0xb4), Z(0x2d), Z(0x99),
Z(0x1c), Z(0x1f), Z(0x8c), Z(0x20), Z(0x03), Z(0x7c), Z(0x5f), Z(0xad),
Z(0xf4), Z(0xfa), Z(0x95), Z(0xca), Z(0x76), Z(0x44), Z(0xcd), Z(0xb6),
Z(0xb8), Z(0xa1), Z(0xa1), Z(0xbe), Z(0x9e), Z(0x54), Z(0x8f), Z(0x0b),
Z(0x16), Z(0x74), Z(0x31), Z(0x8a), Z(0x23), Z(0x17), Z(0x04), Z(0xfa),
Z(0x79), Z(0x84), Z(0xb1), Z(0xf5), Z(0x13), Z(0xab), Z(0xb5), Z(0x2e),
Z(0xaa), Z(0x0c), Z(0x60), Z(0x6b), Z(0x5b), Z(0xc4), Z(0x4b), Z(0xbc),
Z(0xe2), Z(0xaf), Z(0x45), Z(0x73), Z(0xfa), Z(0xc9), Z(0x49), Z(0xcd),
Z(0x00), Z(0x92), Z(0x7d), Z(0x97), Z(0x7a), Z(0x18), Z(0x60), Z(0x3d),
Z(0xcf), Z(0x5b), Z(0xde), Z(0xc6), Z(0xe2), Z(0xe6), Z(0xbb), Z(0x8b),
Z(0x06), Z(0xda), Z(0x08), Z(0x15), Z(0x1b), Z(0x88), Z(0x6a), Z(0x17),
Z(0x89), Z(0xd0), Z(0xa9), Z(0xc1), Z(0xc9), Z(0x70), Z(0x6b), Z(0xe5),
Z(0x43), Z(0xf4), Z(0x68), Z(0xc8), Z(0xd3), Z(0x84), Z(0x28), Z(0x0a),
Z(0x52), Z(0x66), Z(0xa3), Z(0xca), Z(0xf2), Z(0xe3), Z(0x7f), Z(0x7a),
Z(0x31), Z(0xf7), Z(0x88), Z(0x94), Z(0x5e), Z(0x9c), Z(0x63), Z(0xd5),
Z(0x24), Z(0x66), Z(0xfc), Z(0xb3), Z(0x57), Z(0x25), Z(0xbe), Z(0x89),
Z(0x44), Z(0xc4), Z(0xe0), Z(0x8f), Z(0x23), Z(0x3c), Z(0x12), Z(0x52),
Z(0xf5), Z(0x1e), Z(0xf4), Z(0xcb), Z(0x18), Z(0x33), Z(0x1f), Z(0xf8),
Z(0x69), Z(0x10), Z(0x9d), Z(0xd3), Z(0xf7), Z(0x28), Z(0xf8), Z(0x30),
Z(0x05), Z(0x5e), Z(0x32), Z(0xc0), Z(0xd5), Z(0x19), Z(0xbd), Z(0x45),
Z(0x8b), Z(0x5b), Z(0xfd), Z(0xbc), Z(0xe2), Z(0x5c), Z(0xa9), Z(0x96),
Z(0xef), Z(0x70), Z(0xcf), Z(0xc2), Z(0x2a), Z(0xb3), Z(0x61), Z(0xad),
Z(0x80), Z(0x48), Z(0x81), Z(0xb7), Z(0x1d), Z(0x43), Z(0xd9), Z(0xd7),
Z(0x45), Z(0xf0), Z(0xd8), Z(0x8a), Z(0x59), Z(0x7c), Z(0x57), Z(0xc1),
Z(0x79), Z(0xc7), Z(0x34), Z(0xd6), Z(0x43), Z(0xdf), Z(0xe4), Z(0x78),
Z(0x16), Z(0x06), Z(0xda), Z(0x92), Z(0x76), Z(0x51), Z(0xe1), Z(0xd4),
Z(0x70), Z(0x03), Z(0xe0), Z(0x2f), Z(0x96), Z(0x91), Z(0x82), Z(0x80)
};
#undef Z
#define Z(x) cpu_to_be32(x << 11)
static const __be32 sbox2[256] = {
Z(0xf0), Z(0x37), Z(0x24), Z(0x53), Z(0x2a), Z(0x03), Z(0x83), Z(0x86),
Z(0xd1), Z(0xec), Z(0x50), Z(0xf0), Z(0x42), Z(0x78), Z(0x2f), Z(0x6d),
Z(0xbf), Z(0x80), Z(0x87), Z(0x27), Z(0x95), Z(0xe2), Z(0xc5), Z(0x5d),
Z(0xf9), Z(0x6f), Z(0xdb), Z(0xb4), Z(0x65), Z(0x6e), Z(0xe7), Z(0x24),
Z(0xc8), Z(0x1a), Z(0xbb), Z(0x49), Z(0xb5), Z(0x0a), Z(0x7d), Z(0xb9),
Z(0xe8), Z(0xdc), Z(0xb7), Z(0xd9), Z(0x45), Z(0x20), Z(0x1b), Z(0xce),
Z(0x59), Z(0x9d), Z(0x6b), Z(0xbd), Z(0x0e), Z(0x8f), Z(0xa3), Z(0xa9),
Z(0xbc), Z(0x74), Z(0xa6), Z(0xf6), Z(0x7f), Z(0x5f), Z(0xb1), Z(0x68),
Z(0x84), Z(0xbc), Z(0xa9), Z(0xfd), Z(0x55), Z(0x50), Z(0xe9), Z(0xb6),
Z(0x13), Z(0x5e), Z(0x07), Z(0xb8), Z(0x95), Z(0x02), Z(0xc0), Z(0xd0),
Z(0x6a), Z(0x1a), Z(0x85), Z(0xbd), Z(0xb6), Z(0xfd), Z(0xfe), Z(0x17),
Z(0x3f), Z(0x09), Z(0xa3), Z(0x8d), Z(0xfb), Z(0xed), Z(0xda), Z(0x1d),
Z(0x6d), Z(0x1c), Z(0x6c), Z(0x01), Z(0x5a), Z(0xe5), Z(0x71), Z(0x3e),
Z(0x8b), Z(0x6b), Z(0xbe), Z(0x29), Z(0xeb), Z(0x12), Z(0x19), Z(0x34),
Z(0xcd), Z(0xb3), Z(0xbd), Z(0x35), Z(0xea), Z(0x4b), Z(0xd5), Z(0xae),
Z(0x2a), Z(0x79), Z(0x5a), Z(0xa5), Z(0x32), Z(0x12), Z(0x7b), Z(0xdc),
Z(0x2c), Z(0xd0), Z(0x22), Z(0x4b), Z(0xb1), Z(0x85), Z(0x59), Z(0x80),
Z(0xc0), Z(0x30), Z(0x9f), Z(0x73), Z(0xd3), Z(0x14), Z(0x48), Z(0x40),
Z(0x07), Z(0x2d), Z(0x8f), Z(0x80), Z(0x0f), Z(0xce), Z(0x0b), Z(0x5e),
Z(0xb7), Z(0x5e), Z(0xac), Z(0x24), Z(0x94), Z(0x4a), Z(0x18), Z(0x15),
Z(0x05), Z(0xe8), Z(0x02), Z(0x77), Z(0xa9), Z(0xc7), Z(0x40), Z(0x45),
Z(0x89), Z(0xd1), Z(0xea), Z(0xde), Z(0x0c), Z(0x79), Z(0x2a), Z(0x99),
Z(0x6c), Z(0x3e), Z(0x95), Z(0xdd), Z(0x8c), Z(0x7d), Z(0xad), Z(0x6f),
Z(0xdc), Z(0xff), Z(0xfd), Z(0x62), Z(0x47), Z(0xb3), Z(0x21), Z(0x8a),
Z(0xec), Z(0x8e), Z(0x19), Z(0x18), Z(0xb4), Z(0x6e), Z(0x3d), Z(0xfd),
Z(0x74), Z(0x54), Z(0x1e), Z(0x04), Z(0x85), Z(0xd8), Z(0xbc), Z(0x1f),
Z(0x56), Z(0xe7), Z(0x3a), Z(0x56), Z(0x67), Z(0xd6), Z(0xc8), Z(0xa5),
Z(0xf3), Z(0x8e), Z(0xde), Z(0xae), Z(0x37), Z(0x49), Z(0xb7), Z(0xfa),
Z(0xc8), Z(0xf4), Z(0x1f), Z(0xe0), Z(0x2a), Z(0x9b), Z(0x15), Z(0xd1),
Z(0x34), Z(0x0e), Z(0xb5), Z(0xe0), Z(0x44), Z(0x78), Z(0x84), Z(0x59),
Z(0x56), Z(0x68), Z(0x77), Z(0xa5), Z(0x14), Z(0x06), Z(0xf5), Z(0x2f),
Z(0x8c), Z(0x8a), Z(0x73), Z(0x80), Z(0x76), Z(0xb4), Z(0x10), Z(0x86)
};
#undef Z
#define Z(x) cpu_to_be32(x << 19)
static const __be32 sbox3[256] = {
Z(0xa9), Z(0x2a), Z(0x48), Z(0x51), Z(0x84), Z(0x7e), Z(0x49), Z(0xe2),
Z(0xb5), Z(0xb7), Z(0x42), Z(0x33), Z(0x7d), Z(0x5d), Z(0xa6), Z(0x12),
Z(0x44), Z(0x48), Z(0x6d), Z(0x28), Z(0xaa), Z(0x20), Z(0x6d), Z(0x57),
Z(0xd6), Z(0x6b), Z(0x5d), Z(0x72), Z(0xf0), Z(0x92), Z(0x5a), Z(0x1b),
Z(0x53), Z(0x80), Z(0x24), Z(0x70), Z(0x9a), Z(0xcc), Z(0xa7), Z(0x66),
Z(0xa1), Z(0x01), Z(0xa5), Z(0x41), Z(0x97), Z(0x41), Z(0x31), Z(0x82),
Z(0xf1), Z(0x14), Z(0xcf), Z(0x53), Z(0x0d), Z(0xa0), Z(0x10), Z(0xcc),
Z(0x2a), Z(0x7d), Z(0xd2), Z(0xbf), Z(0x4b), Z(0x1a), Z(0xdb), Z(0x16),
Z(0x47), Z(0xf6), Z(0x51), Z(0x36), Z(0xed), Z(0xf3), Z(0xb9), Z(0x1a),
Z(0xa7), Z(0xdf), Z(0x29), Z(0x43), Z(0x01), Z(0x54), Z(0x70), Z(0xa4),
Z(0xbf), Z(0xd4), Z(0x0b), Z(0x53), Z(0x44), Z(0x60), Z(0x9e), Z(0x23),
Z(0xa1), Z(0x18), Z(0x68), Z(0x4f), Z(0xf0), Z(0x2f), Z(0x82), Z(0xc2),
Z(0x2a), Z(0x41), Z(0xb2), Z(0x42), Z(0x0c), Z(0xed), Z(0x0c), Z(0x1d),
Z(0x13), Z(0x3a), Z(0x3c), Z(0x6e), Z(0x35), Z(0xdc), Z(0x60), Z(0x65),
Z(0x85), Z(0xe9), Z(0x64), Z(0x02), Z(0x9a), Z(0x3f), Z(0x9f), Z(0x87),
Z(0x96), Z(0xdf), Z(0xbe), Z(0xf2), Z(0xcb), Z(0xe5), Z(0x6c), Z(0xd4),
Z(0x5a), Z(0x83), Z(0xbf), Z(0x92), Z(0x1b), Z(0x94), Z(0x00), Z(0x42),
Z(0xcf), Z(0x4b), Z(0x00), Z(0x75), Z(0xba), Z(0x8f), Z(0x76), Z(0x5f),
Z(0x5d), Z(0x3a), Z(0x4d), Z(0x09), Z(0x12), Z(0x08), Z(0x38), Z(0x95),
Z(0x17), Z(0xe4), Z(0x01), Z(0x1d), Z(0x4c), Z(0xa9), Z(0xcc), Z(0x85),
Z(0x82), Z(0x4c), Z(0x9d), Z(0x2f), Z(0x3b), Z(0x66), Z(0xa1), Z(0x34),
Z(0x10), Z(0xcd), Z(0x59), Z(0x89), Z(0xa5), Z(0x31), Z(0xcf), Z(0x05),
Z(0xc8), Z(0x84), Z(0xfa), Z(0xc7), Z(0xba), Z(0x4e), Z(0x8b), Z(0x1a),
Z(0x19), Z(0xf1), Z(0xa1), Z(0x3b), Z(0x18), Z(0x12), Z(0x17), Z(0xb0),
Z(0x98), Z(0x8d), Z(0x0b), Z(0x23), Z(0xc3), Z(0x3a), Z(0x2d), Z(0x20),
Z(0xdf), Z(0x13), Z(0xa0), Z(0xa8), Z(0x4c), Z(0x0d), Z(0x6c), Z(0x2f),
Z(0x47), Z(0x13), Z(0x13), Z(0x52), Z(0x1f), Z(0x2d), Z(0xf5), Z(0x79),
Z(0x3d), Z(0xa2), Z(0x54), Z(0xbd), Z(0x69), Z(0xc8), Z(0x6b), Z(0xf3),
Z(0x05), Z(0x28), Z(0xf1), Z(0x16), Z(0x46), Z(0x40), Z(0xb0), Z(0x11),
Z(0xd3), Z(0xb7), Z(0x95), Z(0x49), Z(0xcf), Z(0xc3), Z(0x1d), Z(0x8f),
Z(0xd8), Z(0xe1), Z(0x73), Z(0xdb), Z(0xad), Z(0xc8), Z(0xc9), Z(0xa9),
Z(0xa1), Z(0xc2), Z(0xc5), Z(0xe3), Z(0xba), Z(0xfc), Z(0x0e), Z(0x25)
};
union fcrypt_block {
__be64 a;
struct {
__be32 l, r;
};
};
#define F_ENCRYPT(R, L, sched) \
do { \
union lc4 { \
__be32 l; \
u8 c[4]; \
} u; \
u.l = sched ^ R; \
L ^= sbox0[u.c[0]] ^ sbox1[u.c[1]] ^ sbox2[u.c[2]] ^ \
sbox3[u.c[3]]; \
} while (0)
/* Encrypt one block using FCrypt. */
static __be64 fcrypt_encrypt(const struct fcrypt_key *key, __be64 ptext)
{
union fcrypt_block X = { .a = ptext };
/* This is a 16 round Feistel network with permutation F_ENCRYPT. */
F_ENCRYPT(X.r, X.l, key->sched[0x0]);
F_ENCRYPT(X.l, X.r, key->sched[0x1]);
F_ENCRYPT(X.r, X.l, key->sched[0x2]);
F_ENCRYPT(X.l, X.r, key->sched[0x3]);
F_ENCRYPT(X.r, X.l, key->sched[0x4]);
F_ENCRYPT(X.l, X.r, key->sched[0x5]);
F_ENCRYPT(X.r, X.l, key->sched[0x6]);
F_ENCRYPT(X.l, X.r, key->sched[0x7]);
F_ENCRYPT(X.r, X.l, key->sched[0x8]);
F_ENCRYPT(X.l, X.r, key->sched[0x9]);
F_ENCRYPT(X.r, X.l, key->sched[0xa]);
F_ENCRYPT(X.l, X.r, key->sched[0xb]);
F_ENCRYPT(X.r, X.l, key->sched[0xc]);
F_ENCRYPT(X.l, X.r, key->sched[0xd]);
F_ENCRYPT(X.r, X.l, key->sched[0xe]);
F_ENCRYPT(X.l, X.r, key->sched[0xf]);
return X.a;
}
/* Decrypt one block using FCrypt. */
static __be64 fcrypt_decrypt(const struct fcrypt_key *key, __be64 ctext)
{
union fcrypt_block X = { .a = ctext };
/* This is a 16 round Feistel network with permutation F_ENCRYPT. */
F_ENCRYPT(X.l, X.r, key->sched[0xf]);
F_ENCRYPT(X.r, X.l, key->sched[0xe]);
F_ENCRYPT(X.l, X.r, key->sched[0xd]);
F_ENCRYPT(X.r, X.l, key->sched[0xc]);
F_ENCRYPT(X.l, X.r, key->sched[0xb]);
F_ENCRYPT(X.r, X.l, key->sched[0xa]);
F_ENCRYPT(X.l, X.r, key->sched[0x9]);
F_ENCRYPT(X.r, X.l, key->sched[0x8]);
F_ENCRYPT(X.l, X.r, key->sched[0x7]);
F_ENCRYPT(X.r, X.l, key->sched[0x6]);
F_ENCRYPT(X.l, X.r, key->sched[0x5]);
F_ENCRYPT(X.r, X.l, key->sched[0x4]);
F_ENCRYPT(X.l, X.r, key->sched[0x3]);
F_ENCRYPT(X.r, X.l, key->sched[0x2]);
F_ENCRYPT(X.l, X.r, key->sched[0x1]);
F_ENCRYPT(X.r, X.l, key->sched[0x0]);
return X.a;
}
/**
* fcrypt_preparekey - Prepare a key for FCrypt encryption and decryption
* @key: (out) The prepared key
* @raw_key: The raw key as an 8-byte array
*
* This computes the FCrypt key schedule.
*/
void fcrypt_preparekey(struct fcrypt_key *key, const u8 raw_key[FCRYPT_BSIZE])
{
u64 k = 0;
/* Load the 56 non-parity bits of the key. Discard the parity bits. */
for (int i = 0; i < 8; i++)
k = (k << 7) | (raw_key[i] >> 1);
/* Generate the key schedule word for each round. */
for (int i = 0; i < FCRYPT_ROUNDS; i++) {
key->sched[i] = cpu_to_be32(k);
/* Rotate the low 56 bits of 'k' right by 11 bits. */
k = (k >> 11) | ((k & ((1 << 11) - 1)) << (56 - 11));
}
}
EXPORT_SYMBOL_IF_KUNIT(fcrypt_preparekey);
/**
* fcrypt_pcbc_encrypt - Encrypt data using FCrypt cipher in PCBC mode
* @key: The key
* @iv: The 8-byte initialization vector
* @src: The source data
* @dst: The destination data. Both in-place and out-of-place are supported.
* @nblocks: The number of 8-byte blocks to encrypt
*
* WARNING: This cipher is insecure. Not only is the 56-bit key easily
* brute-forced, the cipher itself is cryptographically weak and doesn't even
* provide the intended 56-bit security level. It effectively just acts as an
* obfuscation algorithm. It is supported only for backwards compatibility.
*/
void fcrypt_pcbc_encrypt(const struct fcrypt_key *key,
const u8 iv[FCRYPT_BSIZE], const void *src, void *dst,
size_t nblocks)
{
__be64 prev = get_unaligned((const __be64 *)iv);
const __be64 *src_blocks = src;
__be64 *dst_blocks = dst;
while (nblocks--) {
__be64 ptext, ctext;
ptext = get_unaligned(src_blocks++);
ctext = fcrypt_encrypt(key, prev ^ ptext);
put_unaligned(ctext, dst_blocks++);
prev = ptext ^ ctext;
}
}
EXPORT_SYMBOL_IF_KUNIT(fcrypt_pcbc_encrypt);
/**
* fcrypt_pcbc_decrypt - Decrypt data using FCrypt cipher in PCBC mode
* @key: The key
* @iv: The 8-byte initialization vector
* @src: The source data
* @dst: The destination data. Both in-place and out-of-place are supported.
* @nblocks: The number of 8-byte blocks to decrypt
*/
void fcrypt_pcbc_decrypt(const struct fcrypt_key *key,
const u8 iv[FCRYPT_BSIZE], const void *src, void *dst,
size_t nblocks)
{
__be64 prev = get_unaligned((const __be64 *)iv);
const __be64 *src_blocks = src;
__be64 *dst_blocks = dst;
while (nblocks--) {
__be64 ptext, ctext;
ctext = get_unaligned(src_blocks++);
ptext = prev ^ fcrypt_decrypt(key, ctext);
put_unaligned(ptext, dst_blocks++);
prev = ptext ^ ctext;
}
}
EXPORT_SYMBOL_IF_KUNIT(fcrypt_pcbc_decrypt);

3
net/rxrpc/tests/Makefile Normal file
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@@ -0,0 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_AF_RXRPC_KUNIT_TEST) += rxrpc_kunit.o

109
net/rxrpc/tests/rxrpc_kunit.c Normal file
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@@ -0,0 +1,109 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Unit tests for RxRPC crypto functions
*
* Copyright 2026 Google LLC
*/
#include "../ar-internal.h"
#include <kunit/test.h>
struct fcrypt_pcbc_testvec {
u8 key[FCRYPT_BSIZE];
u8 iv[FCRYPT_BSIZE];
const u8 *ptext; /* plaintext */
const u8 *ctext; /* ciphertext */
size_t nblocks; /* length of ptext and ctext in blocks */
};
/* FCrypt-PCBC test vectors */
static const struct fcrypt_pcbc_testvec fcrypt_pcbc_testvecs[] = {
{
/* http://www.openafs.org/pipermail/openafs-devel/2000-December/005320.html */
.key = "\x00\x00\x00\x00\x00\x00\x00\x00",
.iv = "\x00\x00\x00\x00\x00\x00\x00\x00",
.ptext = "\x00\x00\x00\x00\x00\x00\x00\x00",
.ctext = "\x0E\x09\x00\xC7\x3E\xF7\xED\x41",
.nblocks = 1,
},
{
.key = "\x11\x44\x77\xAA\xDD\x00\x33\x66",
.iv = "\x00\x00\x00\x00\x00\x00\x00\x00",
.ptext = "\x12\x34\x56\x78\x9A\xBC\xDE\xF0",
.ctext = "\xD8\xED\x78\x74\x77\xEC\x06\x80",
.nblocks = 1,
},
{
/* From Arla */
.key = "\xf0\xe1\xd2\xc3\xb4\xa5\x96\x87",
.iv = "\xfe\xdc\xba\x98\x76\x54\x32\x10",
.ptext = "The quick brown fox jumps over the lazy dogs.\0\0",
.ctext = "\x00\xf0\x0e\x11\x75\xe6\x23\x82"
"\xee\xac\x98\x62\x44\x51\xe4\x84"
"\xc3\x59\xd8\xaa\x64\x60\xae\xf7"
"\xd2\xd9\x13\x79\x72\xa3\x45\x03"
"\x23\xb5\x62\xd7\x0c\xf5\x27\xd1"
"\xf8\x91\x3c\xac\x44\x22\x92\xef",
.nblocks = 6,
},
{
.key = "\xfe\xdc\xba\x98\x76\x54\x32\x10",
.iv = "\xf0\xe1\xd2\xc3\xb4\xa5\x96\x87",
.ptext = "The quick brown fox jumps over the lazy dogs.\0\0",
.ctext = "\xca\x90\xf5\x9d\xcb\xd4\xd2\x3c"
"\x01\x88\x7f\x3e\x31\x6e\x62\x9d"
"\xd8\xe0\x57\xa3\x06\x3a\x42\x58"
"\x2a\x28\xfe\x72\x52\x2f\xdd\xe0"
"\x19\x89\x09\x1c\x2a\x8e\x8c\x94"
"\xfc\xc7\x68\xe4\x88\xaa\xde\x0f",
.nblocks = 6,
}
};
static void test_fcrypt_pcbc(struct kunit *test)
{
u8 data[48];
for (size_t i = 0; i < ARRAY_SIZE(fcrypt_pcbc_testvecs); i++) {
const struct fcrypt_pcbc_testvec *tv = &fcrypt_pcbc_testvecs[i];
const size_t nblocks = tv->nblocks;
const size_t len = nblocks * FCRYPT_BSIZE;
struct fcrypt_key key;
KUNIT_ASSERT_GE(test, sizeof(data), len);
fcrypt_preparekey(&key, tv->key);
/* out-of-place encryption */
fcrypt_pcbc_encrypt(&key, tv->iv, tv->ptext, data, nblocks);
KUNIT_ASSERT_MEMEQ(test, tv->ctext, data, len);
/* in-place encryption */
memcpy(data, tv->ptext, len);
fcrypt_pcbc_encrypt(&key, tv->iv, data, data, nblocks);
KUNIT_ASSERT_MEMEQ(test, tv->ctext, data, len);
/* out-of-place decryption */
fcrypt_pcbc_decrypt(&key, tv->iv, tv->ctext, data, nblocks);
KUNIT_ASSERT_MEMEQ(test, tv->ptext, data, len);
/* in-place decryption */
memcpy(data, tv->ctext, len);
fcrypt_pcbc_decrypt(&key, tv->iv, data, data, nblocks);
KUNIT_ASSERT_MEMEQ(test, tv->ptext, data, len);
}
}
static struct kunit_case rxrpc_test_cases[] = {
KUNIT_CASE(test_fcrypt_pcbc),
{},
};
static struct kunit_suite rxrpc_test_suite = {
.name = "rxrpc",
.test_cases = rxrpc_test_cases,
};
kunit_test_suite(rxrpc_test_suite);
MODULE_DESCRIPTION("Unit tests for RxRPC crypto functions");
MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");
MODULE_LICENSE("GPL");