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-rw-r--r--arch/x86/crypto/blowfish_glue.c477
1 files changed, 477 insertions, 0 deletions
diff --git a/arch/x86/crypto/blowfish_glue.c b/arch/x86/crypto/blowfish_glue.c
new file mode 100644
index 000000000..3e0c07cc9
--- /dev/null
+++ b/arch/x86/crypto/blowfish_glue.c
@@ -0,0 +1,477 @@
+/*
+ * Glue Code for assembler optimized version of Blowfish
+ *
+ * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *
+ * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ * CTR part based on code (crypto/ctr.c) by:
+ * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/blowfish.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+/* regular block cipher functions */
+asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src,
+ bool xor);
+asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
+
+/* 4-way parallel cipher functions */
+asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
+ const u8 *src, bool xor);
+asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
+ const u8 *src);
+
+static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src)
+{
+ __blowfish_enc_blk(ctx, dst, src, false);
+}
+
+static inline void blowfish_enc_blk_xor(struct bf_ctx *ctx, u8 *dst,
+ const u8 *src)
+{
+ __blowfish_enc_blk(ctx, dst, src, true);
+}
+
+static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
+ const u8 *src)
+{
+ __blowfish_enc_blk_4way(ctx, dst, src, false);
+}
+
+static inline void blowfish_enc_blk_xor_4way(struct bf_ctx *ctx, u8 *dst,
+ const u8 *src)
+{
+ __blowfish_enc_blk_4way(ctx, dst, src, true);
+}
+
+static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
+}
+
+static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
+}
+
+static int blowfish_setkey_skcipher(struct crypto_skcipher *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ return blowfish_setkey(&tfm->base, key, keylen);
+}
+
+static int ecb_crypt(struct skcipher_request *req,
+ void (*fn)(struct bf_ctx *, u8 *, const u8 *),
+ void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
+{
+ unsigned int bsize = BF_BLOCK_SIZE;
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes)) {
+ u8 *wsrc = walk.src.virt.addr;
+ u8 *wdst = walk.dst.virt.addr;
+
+ /* Process four block batch */
+ if (nbytes >= bsize * 4) {
+ do {
+ fn_4way(ctx, wdst, wsrc);
+
+ wsrc += bsize * 4;
+ wdst += bsize * 4;
+ nbytes -= bsize * 4;
+ } while (nbytes >= bsize * 4);
+
+ if (nbytes < bsize)
+ goto done;
+ }
+
+ /* Handle leftovers */
+ do {
+ fn(ctx, wdst, wsrc);
+
+ wsrc += bsize;
+ wdst += bsize;
+ nbytes -= bsize;
+ } while (nbytes >= bsize);
+
+done:
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ return err;
+}
+
+static int ecb_encrypt(struct skcipher_request *req)
+{
+ return ecb_crypt(req, blowfish_enc_blk, blowfish_enc_blk_4way);
+}
+
+static int ecb_decrypt(struct skcipher_request *req)
+{
+ return ecb_crypt(req, blowfish_dec_blk, blowfish_dec_blk_4way);
+}
+
+static unsigned int __cbc_encrypt(struct bf_ctx *ctx,
+ struct skcipher_walk *walk)
+{
+ unsigned int bsize = BF_BLOCK_SIZE;
+ unsigned int nbytes = walk->nbytes;
+ u64 *src = (u64 *)walk->src.virt.addr;
+ u64 *dst = (u64 *)walk->dst.virt.addr;
+ u64 *iv = (u64 *)walk->iv;
+
+ do {
+ *dst = *src ^ *iv;
+ blowfish_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
+ iv = dst;
+
+ src += 1;
+ dst += 1;
+ nbytes -= bsize;
+ } while (nbytes >= bsize);
+
+ *(u64 *)walk->iv = *iv;
+ return nbytes;
+}
+
+static int cbc_encrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes)) {
+ nbytes = __cbc_encrypt(ctx, &walk);
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ return err;
+}
+
+static unsigned int __cbc_decrypt(struct bf_ctx *ctx,
+ struct skcipher_walk *walk)
+{
+ unsigned int bsize = BF_BLOCK_SIZE;
+ unsigned int nbytes = walk->nbytes;
+ u64 *src = (u64 *)walk->src.virt.addr;
+ u64 *dst = (u64 *)walk->dst.virt.addr;
+ u64 ivs[4 - 1];
+ u64 last_iv;
+
+ /* Start of the last block. */
+ src += nbytes / bsize - 1;
+ dst += nbytes / bsize - 1;
+
+ last_iv = *src;
+
+ /* Process four block batch */
+ if (nbytes >= bsize * 4) {
+ do {
+ nbytes -= bsize * 4 - bsize;
+ src -= 4 - 1;
+ dst -= 4 - 1;
+
+ ivs[0] = src[0];
+ ivs[1] = src[1];
+ ivs[2] = src[2];
+
+ blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src);
+
+ dst[1] ^= ivs[0];
+ dst[2] ^= ivs[1];
+ dst[3] ^= ivs[2];
+
+ nbytes -= bsize;
+ if (nbytes < bsize)
+ goto done;
+
+ *dst ^= *(src - 1);
+ src -= 1;
+ dst -= 1;
+ } while (nbytes >= bsize * 4);
+ }
+
+ /* Handle leftovers */
+ for (;;) {
+ blowfish_dec_blk(ctx, (u8 *)dst, (u8 *)src);
+
+ nbytes -= bsize;
+ if (nbytes < bsize)
+ break;
+
+ *dst ^= *(src - 1);
+ src -= 1;
+ dst -= 1;
+ }
+
+done:
+ *dst ^= *(u64 *)walk->iv;
+ *(u64 *)walk->iv = last_iv;
+
+ return nbytes;
+}
+
+static int cbc_decrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes)) {
+ nbytes = __cbc_decrypt(ctx, &walk);
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ return err;
+}
+
+static void ctr_crypt_final(struct bf_ctx *ctx, struct skcipher_walk *walk)
+{
+ u8 *ctrblk = walk->iv;
+ u8 keystream[BF_BLOCK_SIZE];
+ u8 *src = walk->src.virt.addr;
+ u8 *dst = walk->dst.virt.addr;
+ unsigned int nbytes = walk->nbytes;
+
+ blowfish_enc_blk(ctx, keystream, ctrblk);
+ crypto_xor_cpy(dst, keystream, src, nbytes);
+
+ crypto_inc(ctrblk, BF_BLOCK_SIZE);
+}
+
+static unsigned int __ctr_crypt(struct bf_ctx *ctx, struct skcipher_walk *walk)
+{
+ unsigned int bsize = BF_BLOCK_SIZE;
+ unsigned int nbytes = walk->nbytes;
+ u64 *src = (u64 *)walk->src.virt.addr;
+ u64 *dst = (u64 *)walk->dst.virt.addr;
+ u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
+ __be64 ctrblocks[4];
+
+ /* Process four block batch */
+ if (nbytes >= bsize * 4) {
+ do {
+ if (dst != src) {
+ dst[0] = src[0];
+ dst[1] = src[1];
+ dst[2] = src[2];
+ dst[3] = src[3];
+ }
+
+ /* create ctrblks for parallel encrypt */
+ ctrblocks[0] = cpu_to_be64(ctrblk++);
+ ctrblocks[1] = cpu_to_be64(ctrblk++);
+ ctrblocks[2] = cpu_to_be64(ctrblk++);
+ ctrblocks[3] = cpu_to_be64(ctrblk++);
+
+ blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
+ (u8 *)ctrblocks);
+
+ src += 4;
+ dst += 4;
+ } while ((nbytes -= bsize * 4) >= bsize * 4);
+
+ if (nbytes < bsize)
+ goto done;
+ }
+
+ /* Handle leftovers */
+ do {
+ if (dst != src)
+ *dst = *src;
+
+ ctrblocks[0] = cpu_to_be64(ctrblk++);
+
+ blowfish_enc_blk_xor(ctx, (u8 *)dst, (u8 *)ctrblocks);
+
+ src += 1;
+ dst += 1;
+ } while ((nbytes -= bsize) >= bsize);
+
+done:
+ *(__be64 *)walk->iv = cpu_to_be64(ctrblk);
+ return nbytes;
+}
+
+static int ctr_crypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes) >= BF_BLOCK_SIZE) {
+ nbytes = __ctr_crypt(ctx, &walk);
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ if (nbytes) {
+ ctr_crypt_final(ctx, &walk);
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ return err;
+}
+
+static struct crypto_alg bf_cipher_alg = {
+ .cra_name = "blowfish",
+ .cra_driver_name = "blowfish-asm",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = BF_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct bf_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .cipher = {
+ .cia_min_keysize = BF_MIN_KEY_SIZE,
+ .cia_max_keysize = BF_MAX_KEY_SIZE,
+ .cia_setkey = blowfish_setkey,
+ .cia_encrypt = blowfish_encrypt,
+ .cia_decrypt = blowfish_decrypt,
+ }
+ }
+};
+
+static struct skcipher_alg bf_skcipher_algs[] = {
+ {
+ .base.cra_name = "ecb(blowfish)",
+ .base.cra_driver_name = "ecb-blowfish-asm",
+ .base.cra_priority = 300,
+ .base.cra_blocksize = BF_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct bf_ctx),
+ .base.cra_module = THIS_MODULE,
+ .min_keysize = BF_MIN_KEY_SIZE,
+ .max_keysize = BF_MAX_KEY_SIZE,
+ .setkey = blowfish_setkey_skcipher,
+ .encrypt = ecb_encrypt,
+ .decrypt = ecb_decrypt,
+ }, {
+ .base.cra_name = "cbc(blowfish)",
+ .base.cra_driver_name = "cbc-blowfish-asm",
+ .base.cra_priority = 300,
+ .base.cra_blocksize = BF_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct bf_ctx),
+ .base.cra_module = THIS_MODULE,
+ .min_keysize = BF_MIN_KEY_SIZE,
+ .max_keysize = BF_MAX_KEY_SIZE,
+ .ivsize = BF_BLOCK_SIZE,
+ .setkey = blowfish_setkey_skcipher,
+ .encrypt = cbc_encrypt,
+ .decrypt = cbc_decrypt,
+ }, {
+ .base.cra_name = "ctr(blowfish)",
+ .base.cra_driver_name = "ctr-blowfish-asm",
+ .base.cra_priority = 300,
+ .base.cra_blocksize = 1,
+ .base.cra_ctxsize = sizeof(struct bf_ctx),
+ .base.cra_module = THIS_MODULE,
+ .min_keysize = BF_MIN_KEY_SIZE,
+ .max_keysize = BF_MAX_KEY_SIZE,
+ .ivsize = BF_BLOCK_SIZE,
+ .chunksize = BF_BLOCK_SIZE,
+ .setkey = blowfish_setkey_skcipher,
+ .encrypt = ctr_crypt,
+ .decrypt = ctr_crypt,
+ },
+};
+
+static bool is_blacklisted_cpu(void)
+{
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+ return false;
+
+ if (boot_cpu_data.x86 == 0x0f) {
+ /*
+ * On Pentium 4, blowfish-x86_64 is slower than generic C
+ * implementation because use of 64bit rotates (which are really
+ * slow on P4). Therefore blacklist P4s.
+ */
+ 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 init(void)
+{
+ int err;
+
+ if (!force && is_blacklisted_cpu()) {
+ printk(KERN_INFO
+ "blowfish-x86_64: performance on this CPU "
+ "would be suboptimal: disabling "
+ "blowfish-x86_64.\n");
+ return -ENODEV;
+ }
+
+ err = crypto_register_alg(&bf_cipher_alg);
+ if (err)
+ return err;
+
+ err = crypto_register_skciphers(bf_skcipher_algs,
+ ARRAY_SIZE(bf_skcipher_algs));
+ if (err)
+ crypto_unregister_alg(&bf_cipher_alg);
+
+ return err;
+}
+
+static void __exit fini(void)
+{
+ crypto_unregister_alg(&bf_cipher_alg);
+ crypto_unregister_skciphers(bf_skcipher_algs,
+ ARRAY_SIZE(bf_skcipher_algs));
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
+MODULE_ALIAS_CRYPTO("blowfish");
+MODULE_ALIAS_CRYPTO("blowfish-asm");
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