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@@ -0,0 +1,530 @@
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+/*
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+ * Glue Code for the AVX assembler implemention of the Cast5 Cipher
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+ *
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+ * Copyright (C) 2012 Johannes Goetzfried
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+ * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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+ * USA
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/hardirq.h>
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+#include <linux/types.h>
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+#include <linux/crypto.h>
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+#include <linux/err.h>
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+#include <crypto/algapi.h>
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+#include <crypto/cast5.h>
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+#include <crypto/cryptd.h>
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+#include <crypto/ctr.h>
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+#include <asm/xcr.h>
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+#include <asm/xsave.h>
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+#include <asm/crypto/ablk_helper.h>
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+#include <asm/crypto/glue_helper.h>
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+
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+#define CAST5_PARALLEL_BLOCKS 16
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+
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+asmlinkage void __cast5_enc_blk_16way(struct cast5_ctx *ctx, u8 *dst,
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+ const u8 *src, bool xor);
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+asmlinkage void cast5_dec_blk_16way(struct cast5_ctx *ctx, u8 *dst,
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+ const u8 *src);
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+
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+static inline void cast5_enc_blk_xway(struct cast5_ctx *ctx, u8 *dst,
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+ const u8 *src)
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+{
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+ __cast5_enc_blk_16way(ctx, dst, src, false);
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+}
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+
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+static inline void cast5_enc_blk_xway_xor(struct cast5_ctx *ctx, u8 *dst,
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+ const u8 *src)
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+{
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+ __cast5_enc_blk_16way(ctx, dst, src, true);
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+}
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+
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+static inline void cast5_dec_blk_xway(struct cast5_ctx *ctx, u8 *dst,
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+ const u8 *src)
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+{
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+ cast5_dec_blk_16way(ctx, dst, src);
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+}
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+
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+
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+static inline bool cast5_fpu_begin(bool fpu_enabled, unsigned int nbytes)
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+{
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+ return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
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+ NULL, fpu_enabled, nbytes);
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+}
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+
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+static inline void cast5_fpu_end(bool fpu_enabled)
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+{
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+ return glue_fpu_end(fpu_enabled);
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+}
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+
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+static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
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+ bool enc)
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+{
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+ bool fpu_enabled = false;
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+ struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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+ const unsigned int bsize = CAST5_BLOCK_SIZE;
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+ unsigned int nbytes;
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+ int err;
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+
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+ err = blkcipher_walk_virt(desc, walk);
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+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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+
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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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+
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+ fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
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+
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+ /* Process multi-block batch */
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+ if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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+ do {
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+ if (enc)
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+ cast5_enc_blk_xway(ctx, wdst, wsrc);
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+ else
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+ cast5_dec_blk_xway(ctx, wdst, wsrc);
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+
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+ wsrc += bsize * CAST5_PARALLEL_BLOCKS;
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+ wdst += bsize * CAST5_PARALLEL_BLOCKS;
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+ nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
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+ } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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+
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+ if (nbytes < bsize)
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+ goto done;
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+ }
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+
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+ /* Handle leftovers */
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+ do {
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+ if (enc)
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+ __cast5_encrypt(ctx, wdst, wsrc);
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+ else
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+ __cast5_decrypt(ctx, wdst, wsrc);
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+
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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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+
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+done:
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+ err = blkcipher_walk_done(desc, walk, nbytes);
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+ }
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+
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+ cast5_fpu_end(fpu_enabled);
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+ return err;
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+}
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+
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+static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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+ struct scatterlist *src, unsigned int nbytes)
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+{
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+ struct blkcipher_walk walk;
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+
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+ blkcipher_walk_init(&walk, dst, src, nbytes);
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+ return ecb_crypt(desc, &walk, true);
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+}
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+
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+static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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+ struct scatterlist *src, unsigned int nbytes)
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+{
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+ struct blkcipher_walk walk;
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+
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+ blkcipher_walk_init(&walk, dst, src, nbytes);
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+ return ecb_crypt(desc, &walk, false);
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+}
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+
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+static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
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+ struct blkcipher_walk *walk)
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+{
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+ struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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+ const unsigned int bsize = CAST5_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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+
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+ do {
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+ *dst = *src ^ *iv;
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+ __cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
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+ iv = dst;
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+
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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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+
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+ *(u64 *)walk->iv ^= *iv;
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+ return nbytes;
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+}
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+
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+static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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+ struct scatterlist *src, unsigned int nbytes)
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+{
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+ struct blkcipher_walk walk;
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+ int err;
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+
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+ blkcipher_walk_init(&walk, dst, src, nbytes);
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+ err = blkcipher_walk_virt(desc, &walk);
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+
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+ while ((nbytes = walk.nbytes)) {
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+ nbytes = __cbc_encrypt(desc, &walk);
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+ err = blkcipher_walk_done(desc, &walk, nbytes);
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+ }
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+
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+ return err;
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+}
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+
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+static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
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+ struct blkcipher_walk *walk)
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+{
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+ struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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+ const unsigned int bsize = CAST5_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[CAST5_PARALLEL_BLOCKS - 1];
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+ u64 last_iv;
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+ int i;
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+
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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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+
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+ last_iv = *src;
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+
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+ /* Process multi-block batch */
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+ if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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+ do {
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+ nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
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+ src -= CAST5_PARALLEL_BLOCKS - 1;
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+ dst -= CAST5_PARALLEL_BLOCKS - 1;
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+
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+ for (i = 0; i < CAST5_PARALLEL_BLOCKS - 1; i++)
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+ ivs[i] = src[i];
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+
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+ cast5_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
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+
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+ for (i = 0; i < CAST5_PARALLEL_BLOCKS - 1; i++)
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+ *(dst + (i + 1)) ^= *(ivs + i);
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+
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+ nbytes -= bsize;
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+ if (nbytes < bsize)
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+ goto done;
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+
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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 * CAST5_PARALLEL_BLOCKS);
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+
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+ if (nbytes < bsize)
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+ goto done;
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+ }
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+
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+ /* Handle leftovers */
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+ for (;;) {
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+ __cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);
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+
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+ nbytes -= bsize;
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+ if (nbytes < bsize)
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+ break;
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+
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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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+
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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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+
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+ return nbytes;
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+}
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+
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+static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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+ struct scatterlist *src, unsigned int nbytes)
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+{
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+ bool fpu_enabled = false;
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+ struct blkcipher_walk walk;
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+ int err;
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+
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+ blkcipher_walk_init(&walk, dst, src, nbytes);
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+ err = blkcipher_walk_virt(desc, &walk);
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+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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+
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+ while ((nbytes = walk.nbytes)) {
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+ fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
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+ nbytes = __cbc_decrypt(desc, &walk);
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+ err = blkcipher_walk_done(desc, &walk, nbytes);
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+ }
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+
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+ cast5_fpu_end(fpu_enabled);
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+ return err;
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+}
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+
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+static void ctr_crypt_final(struct blkcipher_desc *desc,
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+ struct blkcipher_walk *walk)
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+{
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+ struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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+ u8 *ctrblk = walk->iv;
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+ u8 keystream[CAST5_BLOCK_SIZE];
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+ u8 *src = walk->src.virt.addr;
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+ u8 *dst = walk->dst.virt.addr;
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+ unsigned int nbytes = walk->nbytes;
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+
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+ __cast5_encrypt(ctx, keystream, ctrblk);
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+ crypto_xor(keystream, src, nbytes);
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+ memcpy(dst, keystream, nbytes);
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+
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+ crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
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+}
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+
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+static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
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+ struct blkcipher_walk *walk)
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+{
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+ struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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+ const unsigned int bsize = CAST5_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 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
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+ __be64 ctrblocks[CAST5_PARALLEL_BLOCKS];
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+ int i;
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+
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+ /* Process multi-block batch */
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+ if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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+ do {
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+ /* create ctrblks for parallel encrypt */
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+ for (i = 0; i < CAST5_PARALLEL_BLOCKS; i++) {
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+ if (dst != src)
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+ dst[i] = src[i];
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+
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+ ctrblocks[i] = cpu_to_be64(ctrblk++);
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+ }
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+
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+ cast5_enc_blk_xway_xor(ctx, (u8 *)dst,
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+ (u8 *)ctrblocks);
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+
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+ src += CAST5_PARALLEL_BLOCKS;
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+ dst += CAST5_PARALLEL_BLOCKS;
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+ nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
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+ } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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+
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+ if (nbytes < bsize)
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+ goto done;
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+ }
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+
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+ /* Handle leftovers */
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+ do {
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+ if (dst != src)
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+ *dst = *src;
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+
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+ ctrblocks[0] = cpu_to_be64(ctrblk++);
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+
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+ __cast5_encrypt(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
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+ *dst ^= ctrblocks[0];
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+
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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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+
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+done:
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+ *(__be64 *)walk->iv = cpu_to_be64(ctrblk);
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+ return nbytes;
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+}
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+
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+static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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+ struct scatterlist *src, unsigned int nbytes)
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+{
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+ bool fpu_enabled = false;
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+ struct blkcipher_walk walk;
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+ int err;
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+
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+ blkcipher_walk_init(&walk, dst, src, nbytes);
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+ err = blkcipher_walk_virt_block(desc, &walk, CAST5_BLOCK_SIZE);
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+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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+
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+ while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
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+ fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
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+ nbytes = __ctr_crypt(desc, &walk);
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+ err = blkcipher_walk_done(desc, &walk, nbytes);
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+ }
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+
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+ cast5_fpu_end(fpu_enabled);
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+
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+ if (walk.nbytes) {
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+ ctr_crypt_final(desc, &walk);
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+ err = blkcipher_walk_done(desc, &walk, 0);
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+ }
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+
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+ return err;
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+}
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+
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+
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+static struct crypto_alg cast5_algs[6] = { {
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+ .cra_name = "__ecb-cast5-avx",
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+ .cra_driver_name = "__driver-ecb-cast5-avx",
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+ .cra_priority = 0,
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+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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+ .cra_blocksize = CAST5_BLOCK_SIZE,
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+ .cra_ctxsize = sizeof(struct cast5_ctx),
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+ .cra_alignmask = 0,
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+ .cra_type = &crypto_blkcipher_type,
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+ .cra_module = THIS_MODULE,
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+ .cra_u = {
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+ .blkcipher = {
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+ .min_keysize = CAST5_MIN_KEY_SIZE,
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+ .max_keysize = CAST5_MAX_KEY_SIZE,
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+ .setkey = cast5_setkey,
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+ .encrypt = ecb_encrypt,
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+ .decrypt = ecb_decrypt,
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+ },
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+ },
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+}, {
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+ .cra_name = "__cbc-cast5-avx",
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+ .cra_driver_name = "__driver-cbc-cast5-avx",
|
|
|
+ .cra_priority = 0,
|
|
|
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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|
|
+ .cra_blocksize = CAST5_BLOCK_SIZE,
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|
|
+ .cra_ctxsize = sizeof(struct cast5_ctx),
|
|
|
+ .cra_alignmask = 0,
|
|
|
+ .cra_type = &crypto_blkcipher_type,
|
|
|
+ .cra_module = THIS_MODULE,
|
|
|
+ .cra_u = {
|
|
|
+ .blkcipher = {
|
|
|
+ .min_keysize = CAST5_MIN_KEY_SIZE,
|
|
|
+ .max_keysize = CAST5_MAX_KEY_SIZE,
|
|
|
+ .setkey = cast5_setkey,
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|
|
+ .encrypt = cbc_encrypt,
|
|
|
+ .decrypt = cbc_decrypt,
|
|
|
+ },
|
|
|
+ },
|
|
|
+}, {
|
|
|
+ .cra_name = "__ctr-cast5-avx",
|
|
|
+ .cra_driver_name = "__driver-ctr-cast5-avx",
|
|
|
+ .cra_priority = 0,
|
|
|
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
|
+ .cra_blocksize = 1,
|
|
|
+ .cra_ctxsize = sizeof(struct cast5_ctx),
|
|
|
+ .cra_alignmask = 0,
|
|
|
+ .cra_type = &crypto_blkcipher_type,
|
|
|
+ .cra_module = THIS_MODULE,
|
|
|
+ .cra_u = {
|
|
|
+ .blkcipher = {
|
|
|
+ .min_keysize = CAST5_MIN_KEY_SIZE,
|
|
|
+ .max_keysize = CAST5_MAX_KEY_SIZE,
|
|
|
+ .ivsize = CAST5_BLOCK_SIZE,
|
|
|
+ .setkey = cast5_setkey,
|
|
|
+ .encrypt = ctr_crypt,
|
|
|
+ .decrypt = ctr_crypt,
|
|
|
+ },
|
|
|
+ },
|
|
|
+}, {
|
|
|
+ .cra_name = "ecb(cast5)",
|
|
|
+ .cra_driver_name = "ecb-cast5-avx",
|
|
|
+ .cra_priority = 200,
|
|
|
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
|
+ .cra_blocksize = CAST5_BLOCK_SIZE,
|
|
|
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
|
+ .cra_alignmask = 0,
|
|
|
+ .cra_type = &crypto_ablkcipher_type,
|
|
|
+ .cra_module = THIS_MODULE,
|
|
|
+ .cra_init = ablk_init,
|
|
|
+ .cra_exit = ablk_exit,
|
|
|
+ .cra_u = {
|
|
|
+ .ablkcipher = {
|
|
|
+ .min_keysize = CAST5_MIN_KEY_SIZE,
|
|
|
+ .max_keysize = CAST5_MAX_KEY_SIZE,
|
|
|
+ .setkey = ablk_set_key,
|
|
|
+ .encrypt = ablk_encrypt,
|
|
|
+ .decrypt = ablk_decrypt,
|
|
|
+ },
|
|
|
+ },
|
|
|
+}, {
|
|
|
+ .cra_name = "cbc(cast5)",
|
|
|
+ .cra_driver_name = "cbc-cast5-avx",
|
|
|
+ .cra_priority = 200,
|
|
|
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
|
+ .cra_blocksize = CAST5_BLOCK_SIZE,
|
|
|
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
|
+ .cra_alignmask = 0,
|
|
|
+ .cra_type = &crypto_ablkcipher_type,
|
|
|
+ .cra_module = THIS_MODULE,
|
|
|
+ .cra_init = ablk_init,
|
|
|
+ .cra_exit = ablk_exit,
|
|
|
+ .cra_u = {
|
|
|
+ .ablkcipher = {
|
|
|
+ .min_keysize = CAST5_MIN_KEY_SIZE,
|
|
|
+ .max_keysize = CAST5_MAX_KEY_SIZE,
|
|
|
+ .ivsize = CAST5_BLOCK_SIZE,
|
|
|
+ .setkey = ablk_set_key,
|
|
|
+ .encrypt = __ablk_encrypt,
|
|
|
+ .decrypt = ablk_decrypt,
|
|
|
+ },
|
|
|
+ },
|
|
|
+}, {
|
|
|
+ .cra_name = "ctr(cast5)",
|
|
|
+ .cra_driver_name = "ctr-cast5-avx",
|
|
|
+ .cra_priority = 200,
|
|
|
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
|
+ .cra_blocksize = 1,
|
|
|
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
|
+ .cra_alignmask = 0,
|
|
|
+ .cra_type = &crypto_ablkcipher_type,
|
|
|
+ .cra_module = THIS_MODULE,
|
|
|
+ .cra_init = ablk_init,
|
|
|
+ .cra_exit = ablk_exit,
|
|
|
+ .cra_u = {
|
|
|
+ .ablkcipher = {
|
|
|
+ .min_keysize = CAST5_MIN_KEY_SIZE,
|
|
|
+ .max_keysize = CAST5_MAX_KEY_SIZE,
|
|
|
+ .ivsize = CAST5_BLOCK_SIZE,
|
|
|
+ .setkey = ablk_set_key,
|
|
|
+ .encrypt = ablk_encrypt,
|
|
|
+ .decrypt = ablk_encrypt,
|
|
|
+ .geniv = "chainiv",
|
|
|
+ },
|
|
|
+ },
|
|
|
+} };
|
|
|
+
|
|
|
+static int __init cast5_init(void)
|
|
|
+{
|
|
|
+ u64 xcr0;
|
|
|
+
|
|
|
+ if (!cpu_has_avx || !cpu_has_osxsave) {
|
|
|
+ pr_info("AVX instructions are not detected.\n");
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
|
|
|
+ if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
|
|
|
+ pr_info("AVX detected but unusable.\n");
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ return crypto_register_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit cast5_exit(void)
|
|
|
+{
|
|
|
+ crypto_unregister_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
|
|
|
+}
|
|
|
+
|
|
|
+module_init(cast5_init);
|
|
|
+module_exit(cast5_exit);
|
|
|
+
|
|
|
+MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
|
|
|
+MODULE_LICENSE("GPL");
|
|
|
+MODULE_ALIAS("cast5");
|
Johannes Goetzfried