2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API.
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*
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* Blowfish Cipher Algorithm, by Bruce Schneier.
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* http://www.counterpane.com/blowfish.html
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*
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* Adapted from Kerneli implementation.
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*
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* Copyright (c) Herbert Valerio Riedel <hvr@hvrlab.org>
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* Copyright (c) Kyle McMartin <kyle@debian.org>
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <asm/byteorder.h>
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#include <linux/crypto.h>
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#include <linux/types.h>
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#include <crypto/blowfish.h>
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/*
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* Round loop unrolling macros, S is a pointer to a S-Box array
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* organized in 4 unsigned longs at a row.
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*/
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#define GET32_3(x) (((x) & 0xff))
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#define GET32_2(x) (((x) >> (8)) & (0xff))
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#define GET32_1(x) (((x) >> (16)) & (0xff))
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#define GET32_0(x) (((x) >> (24)) & (0xff))
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#define bf_F(x) (((S[GET32_0(x)] + S[256 + GET32_1(x)]) ^ \
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S[512 + GET32_2(x)]) + S[768 + GET32_3(x)])
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#define ROUND(a, b, n) ({ b ^= P[n]; a ^= bf_F(b); })
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static void bf_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
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const __be32 *in_blk = (const __be32 *)src;
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__be32 *const out_blk = (__be32 *)dst;
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const u32 *P = ctx->p;
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const u32 *S = ctx->s;
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u32 yl = be32_to_cpu(in_blk[0]);
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u32 yr = be32_to_cpu(in_blk[1]);
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ROUND(yr, yl, 0);
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ROUND(yl, yr, 1);
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ROUND(yr, yl, 2);
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ROUND(yl, yr, 3);
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ROUND(yr, yl, 4);
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ROUND(yl, yr, 5);
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ROUND(yr, yl, 6);
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ROUND(yl, yr, 7);
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ROUND(yr, yl, 8);
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ROUND(yl, yr, 9);
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ROUND(yr, yl, 10);
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ROUND(yl, yr, 11);
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ROUND(yr, yl, 12);
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ROUND(yl, yr, 13);
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ROUND(yr, yl, 14);
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ROUND(yl, yr, 15);
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yl ^= P[16];
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yr ^= P[17];
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out_blk[0] = cpu_to_be32(yr);
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out_blk[1] = cpu_to_be32(yl);
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}
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static void bf_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
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const __be32 *in_blk = (const __be32 *)src;
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__be32 *const out_blk = (__be32 *)dst;
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const u32 *P = ctx->p;
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const u32 *S = ctx->s;
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u32 yl = be32_to_cpu(in_blk[0]);
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u32 yr = be32_to_cpu(in_blk[1]);
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ROUND(yr, yl, 17);
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ROUND(yl, yr, 16);
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ROUND(yr, yl, 15);
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ROUND(yl, yr, 14);
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ROUND(yr, yl, 13);
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ROUND(yl, yr, 12);
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ROUND(yr, yl, 11);
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ROUND(yl, yr, 10);
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ROUND(yr, yl, 9);
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ROUND(yl, yr, 8);
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ROUND(yr, yl, 7);
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ROUND(yl, yr, 6);
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ROUND(yr, yl, 5);
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ROUND(yl, yr, 4);
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ROUND(yr, yl, 3);
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ROUND(yl, yr, 2);
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yl ^= P[1];
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yr ^= P[0];
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out_blk[0] = cpu_to_be32(yr);
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out_blk[1] = cpu_to_be32(yl);
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}
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static struct crypto_alg alg = {
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.cra_name = "blowfish",
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.cra_driver_name = "blowfish-generic",
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.cra_priority = 100,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = BF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct bf_ctx),
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.cra_alignmask = 3,
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.cra_module = THIS_MODULE,
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.cra_u = { .cipher = {
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.cia_min_keysize = BF_MIN_KEY_SIZE,
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.cia_max_keysize = BF_MAX_KEY_SIZE,
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.cia_setkey = blowfish_setkey,
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.cia_encrypt = bf_encrypt,
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.cia_decrypt = bf_decrypt } }
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};
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static int __init blowfish_mod_init(void)
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{
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return crypto_register_alg(&alg);
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}
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static void __exit blowfish_mod_fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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subsys_initcall(blowfish_mod_init);
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module_exit(blowfish_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Blowfish Cipher Algorithm");
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MODULE_ALIAS_CRYPTO("blowfish");
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MODULE_ALIAS_CRYPTO("blowfish-generic");
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