344 строки
7.8 KiB
C
344 строки
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Glue Code for assembler optimized version of Blowfish
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/algapi.h>
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#include <crypto/blowfish.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/crypto.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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/* regular block cipher functions */
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asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src,
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bool xor);
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asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
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/* 4-way parallel cipher functions */
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asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src, bool xor);
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asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src);
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static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src)
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{
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__blowfish_enc_blk(ctx, dst, src, false);
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}
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static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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__blowfish_enc_blk_4way(ctx, dst, src, false);
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}
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static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
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}
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static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
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}
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static int blowfish_setkey_skcipher(struct crypto_skcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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return blowfish_setkey(&tfm->base, key, keylen);
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}
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static int ecb_crypt(struct skcipher_request *req,
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void (*fn)(struct bf_ctx *, u8 *, const u8 *),
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void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
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{
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unsigned int bsize = BF_BLOCK_SIZE;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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u8 *wsrc = walk.src.virt.addr;
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u8 *wdst = walk.dst.virt.addr;
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/* Process four block batch */
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if (nbytes >= bsize * 4) {
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do {
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fn_4way(ctx, wdst, wsrc);
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wsrc += bsize * 4;
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wdst += bsize * 4;
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nbytes -= bsize * 4;
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} while (nbytes >= bsize * 4);
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if (nbytes < bsize)
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goto done;
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}
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/* Handle leftovers */
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do {
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fn(ctx, wdst, wsrc);
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wsrc += bsize;
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wdst += bsize;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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done:
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static int ecb_encrypt(struct skcipher_request *req)
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{
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return ecb_crypt(req, blowfish_enc_blk, blowfish_enc_blk_4way);
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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return ecb_crypt(req, blowfish_dec_blk, blowfish_dec_blk_4way);
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}
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static unsigned int __cbc_encrypt(struct bf_ctx *ctx,
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struct skcipher_walk *walk)
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{
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unsigned int bsize = BF_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u64 *src = (u64 *)walk->src.virt.addr;
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u64 *dst = (u64 *)walk->dst.virt.addr;
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u64 *iv = (u64 *)walk->iv;
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do {
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*dst = *src ^ *iv;
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blowfish_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
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iv = dst;
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src += 1;
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dst += 1;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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*(u64 *)walk->iv = *iv;
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return nbytes;
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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nbytes = __cbc_encrypt(ctx, &walk);
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static unsigned int __cbc_decrypt(struct bf_ctx *ctx,
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struct skcipher_walk *walk)
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{
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unsigned int bsize = BF_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u64 *src = (u64 *)walk->src.virt.addr;
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u64 *dst = (u64 *)walk->dst.virt.addr;
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u64 ivs[4 - 1];
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u64 last_iv;
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/* Start of the last block. */
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src += nbytes / bsize - 1;
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dst += nbytes / bsize - 1;
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last_iv = *src;
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/* Process four block batch */
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if (nbytes >= bsize * 4) {
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do {
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nbytes -= bsize * 4 - bsize;
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src -= 4 - 1;
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dst -= 4 - 1;
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ivs[0] = src[0];
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ivs[1] = src[1];
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ivs[2] = src[2];
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blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src);
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dst[1] ^= ivs[0];
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dst[2] ^= ivs[1];
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dst[3] ^= ivs[2];
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nbytes -= bsize;
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if (nbytes < bsize)
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goto done;
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*dst ^= *(src - 1);
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src -= 1;
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dst -= 1;
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} while (nbytes >= bsize * 4);
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}
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/* Handle leftovers */
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for (;;) {
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blowfish_dec_blk(ctx, (u8 *)dst, (u8 *)src);
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nbytes -= bsize;
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if (nbytes < bsize)
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break;
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*dst ^= *(src - 1);
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src -= 1;
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dst -= 1;
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}
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done:
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*dst ^= *(u64 *)walk->iv;
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*(u64 *)walk->iv = last_iv;
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return nbytes;
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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nbytes = __cbc_decrypt(ctx, &walk);
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static struct crypto_alg bf_cipher_alg = {
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.cra_name = "blowfish",
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.cra_driver_name = "blowfish-asm",
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.cra_priority = 200,
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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 = 0,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.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 = blowfish_encrypt,
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.cia_decrypt = blowfish_decrypt,
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}
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}
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};
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static struct skcipher_alg bf_skcipher_algs[] = {
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{
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.base.cra_name = "ecb(blowfish)",
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.base.cra_driver_name = "ecb-blowfish-asm",
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.base.cra_priority = 300,
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.base.cra_blocksize = BF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct bf_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = BF_MIN_KEY_SIZE,
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.max_keysize = BF_MAX_KEY_SIZE,
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.setkey = blowfish_setkey_skcipher,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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}, {
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.base.cra_name = "cbc(blowfish)",
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.base.cra_driver_name = "cbc-blowfish-asm",
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.base.cra_priority = 300,
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.base.cra_blocksize = BF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct bf_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = BF_MIN_KEY_SIZE,
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.max_keysize = BF_MAX_KEY_SIZE,
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.ivsize = BF_BLOCK_SIZE,
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.setkey = blowfish_setkey_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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};
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static bool is_blacklisted_cpu(void)
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{
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if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
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return false;
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if (boot_cpu_data.x86 == 0x0f) {
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/*
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* On Pentium 4, blowfish-x86_64 is slower than generic C
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* implementation because use of 64bit rotates (which are really
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* slow on P4). Therefore blacklist P4s.
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*/
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return true;
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}
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return false;
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}
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static int force;
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module_param(force, int, 0);
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MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
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static int __init blowfish_init(void)
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{
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int err;
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if (!force && is_blacklisted_cpu()) {
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printk(KERN_INFO
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"blowfish-x86_64: performance on this CPU "
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"would be suboptimal: disabling "
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"blowfish-x86_64.\n");
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return -ENODEV;
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}
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err = crypto_register_alg(&bf_cipher_alg);
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if (err)
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return err;
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err = crypto_register_skciphers(bf_skcipher_algs,
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ARRAY_SIZE(bf_skcipher_algs));
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if (err)
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crypto_unregister_alg(&bf_cipher_alg);
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return err;
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}
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static void __exit blowfish_fini(void)
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{
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crypto_unregister_alg(&bf_cipher_alg);
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crypto_unregister_skciphers(bf_skcipher_algs,
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ARRAY_SIZE(bf_skcipher_algs));
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}
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module_init(blowfish_init);
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module_exit(blowfish_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
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MODULE_ALIAS_CRYPTO("blowfish");
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MODULE_ALIAS_CRYPTO("blowfish-asm");
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