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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/x86/crypto/twofish_glue_3way.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/crypto/twofish_glue_3way.c')
-rw-r--r--arch/x86/crypto/twofish_glue_3way.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/x86/crypto/twofish_glue_3way.c b/arch/x86/crypto/twofish_glue_3way.c
new file mode 100644
index 000000000..90454cf18
--- /dev/null
+++ b/arch/x86/crypto/twofish_glue_3way.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Glue Code for 3-way parallel assembler optimized version of Twofish
+ *
+ * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/twofish.h>
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include "twofish.h"
+#include "ecb_cbc_helpers.h"
+
+EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way);
+EXPORT_SYMBOL_GPL(twofish_dec_blk_3way);
+
+static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ return twofish_setkey(&tfm->base, key, keylen);
+}
+
+static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
+{
+ __twofish_enc_blk_3way(ctx, dst, src, false);
+}
+
+void twofish_dec_blk_cbc_3way(const void *ctx, u8 *dst, const u8 *src)
+{
+ u8 buf[2][TF_BLOCK_SIZE];
+ const u8 *s = src;
+
+ if (dst == src)
+ s = memcpy(buf, src, sizeof(buf));
+ twofish_dec_blk_3way(ctx, dst, src);
+ crypto_xor(dst + TF_BLOCK_SIZE, s, sizeof(buf));
+
+}
+EXPORT_SYMBOL_GPL(twofish_dec_blk_cbc_3way);
+
+static int ecb_encrypt(struct skcipher_request *req)
+{
+ ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
+ ECB_BLOCK(3, twofish_enc_blk_3way);
+ ECB_BLOCK(1, twofish_enc_blk);
+ ECB_WALK_END();
+}
+
+static int ecb_decrypt(struct skcipher_request *req)
+{
+ ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
+ ECB_BLOCK(3, twofish_dec_blk_3way);
+ ECB_BLOCK(1, twofish_dec_blk);
+ ECB_WALK_END();
+}
+
+static int cbc_encrypt(struct skcipher_request *req)
+{
+ CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
+ CBC_ENC_BLOCK(twofish_enc_blk);
+ CBC_WALK_END();
+}
+
+static int cbc_decrypt(struct skcipher_request *req)
+{
+ CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
+ CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
+ CBC_DEC_BLOCK(1, twofish_dec_blk);
+ CBC_WALK_END();
+}
+
+static struct skcipher_alg tf_skciphers[] = {
+ {
+ .base.cra_name = "ecb(twofish)",
+ .base.cra_driver_name = "ecb-twofish-3way",
+ .base.cra_priority = 300,
+ .base.cra_blocksize = TF_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct twofish_ctx),
+ .base.cra_module = THIS_MODULE,
+ .min_keysize = TF_MIN_KEY_SIZE,
+ .max_keysize = TF_MAX_KEY_SIZE,
+ .setkey = twofish_setkey_skcipher,
+ .encrypt = ecb_encrypt,
+ .decrypt = ecb_decrypt,
+ }, {
+ .base.cra_name = "cbc(twofish)",
+ .base.cra_driver_name = "cbc-twofish-3way",
+ .base.cra_priority = 300,
+ .base.cra_blocksize = TF_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct twofish_ctx),
+ .base.cra_module = THIS_MODULE,
+ .min_keysize = TF_MIN_KEY_SIZE,
+ .max_keysize = TF_MAX_KEY_SIZE,
+ .ivsize = TF_BLOCK_SIZE,
+ .setkey = twofish_setkey_skcipher,
+ .encrypt = cbc_encrypt,
+ .decrypt = cbc_decrypt,
+ },
+};
+
+static bool is_blacklisted_cpu(void)
+{
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+ return false;
+
+ if (boot_cpu_data.x86 == 0x06 &&
+ (boot_cpu_data.x86_model == 0x1c ||
+ boot_cpu_data.x86_model == 0x26 ||
+ boot_cpu_data.x86_model == 0x36)) {
+ /*
+ * On Atom, twofish-3way is slower than original assembler
+ * implementation. Twofish-3way trades off some performance in
+ * storing blocks in 64bit registers to allow three blocks to
+ * be processed parallel. Parallel operation then allows gaining
+ * more performance than was trade off, on out-of-order CPUs.
+ * However Atom does not benefit from this parallelism and
+ * should be blacklisted.
+ */
+ return true;
+ }
+
+ if (boot_cpu_data.x86 == 0x0f) {
+ /*
+ * On Pentium 4, twofish-3way is slower than original assembler
+ * implementation because excessive uses of 64bit rotate and
+ * left-shifts (which are really slow on P4) needed to store and
+ * handle 128bit block in two 64bit registers.
+ */
+ return true;
+ }
+
+ return false;
+}
+
+static int force;
+module_param(force, int, 0);
+MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
+
+static int __init twofish_3way_init(void)
+{
+ if (!force && is_blacklisted_cpu()) {
+ printk(KERN_INFO
+ "twofish-x86_64-3way: performance on this CPU "
+ "would be suboptimal: disabling "
+ "twofish-x86_64-3way.\n");
+ return -ENODEV;
+ }
+
+ return crypto_register_skciphers(tf_skciphers,
+ ARRAY_SIZE(tf_skciphers));
+}
+
+static void __exit twofish_3way_fini(void)
+{
+ crypto_unregister_skciphers(tf_skciphers, ARRAY_SIZE(tf_skciphers));
+}
+
+module_init(twofish_3way_init);
+module_exit(twofish_3way_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized");
+MODULE_ALIAS_CRYPTO("twofish");
+MODULE_ALIAS_CRYPTO("twofish-asm");