diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/crypto/twofish_glue_3way.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/crypto/twofish_glue_3way.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/arch/x86/crypto/twofish_glue_3way.c b/ANDROID_3.4.5/arch/x86/crypto/twofish_glue_3way.c new file mode 100644 index 00000000..922ab24c --- /dev/null +++ b/ANDROID_3.4.5/arch/x86/crypto/twofish_glue_3way.c @@ -0,0 +1,695 @@ +/* + * Glue Code for 3-way parallel assembler optimized version of Twofish + * + * 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 <asm/processor.h> +#include <linux/crypto.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/types.h> +#include <crypto/algapi.h> +#include <crypto/twofish.h> +#include <crypto/b128ops.h> +#include <crypto/lrw.h> +#include <crypto/xts.h> + +/* regular block cipher functions from twofish_x86_64 module */ +asmlinkage void twofish_enc_blk(struct twofish_ctx *ctx, u8 *dst, + const u8 *src); +asmlinkage void twofish_dec_blk(struct twofish_ctx *ctx, u8 *dst, + const u8 *src); + +/* 3-way parallel cipher functions */ +asmlinkage void __twofish_enc_blk_3way(struct twofish_ctx *ctx, u8 *dst, + const u8 *src, bool xor); +asmlinkage void twofish_dec_blk_3way(struct twofish_ctx *ctx, u8 *dst, + const u8 *src); + +static inline void twofish_enc_blk_3way(struct twofish_ctx *ctx, u8 *dst, + const u8 *src) +{ + __twofish_enc_blk_3way(ctx, dst, src, false); +} + +static inline void twofish_enc_blk_xor_3way(struct twofish_ctx *ctx, u8 *dst, + const u8 *src) +{ + __twofish_enc_blk_3way(ctx, dst, src, true); +} + +static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, + void (*fn)(struct twofish_ctx *, u8 *, const u8 *), + void (*fn_3way)(struct twofish_ctx *, u8 *, const u8 *)) +{ + struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + unsigned int bsize = TF_BLOCK_SIZE; + unsigned int nbytes; + int err; + + err = blkcipher_walk_virt(desc, walk); + + while ((nbytes = walk->nbytes)) { + u8 *wsrc = walk->src.virt.addr; + u8 *wdst = walk->dst.virt.addr; + + /* Process three block batch */ + if (nbytes >= bsize * 3) { + do { + fn_3way(ctx, wdst, wsrc); + + wsrc += bsize * 3; + wdst += bsize * 3; + nbytes -= bsize * 3; + } while (nbytes >= bsize * 3); + + if (nbytes < bsize) + goto done; + } + + /* Handle leftovers */ + do { + fn(ctx, wdst, wsrc); + + wsrc += bsize; + wdst += bsize; + nbytes -= bsize; + } while (nbytes >= bsize); + +done: + err = blkcipher_walk_done(desc, walk, nbytes); + } + + return err; +} + +static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct blkcipher_walk walk; + + blkcipher_walk_init(&walk, dst, src, nbytes); + return ecb_crypt(desc, &walk, twofish_enc_blk, twofish_enc_blk_3way); +} + +static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct blkcipher_walk walk; + + blkcipher_walk_init(&walk, dst, src, nbytes); + return ecb_crypt(desc, &walk, twofish_dec_blk, twofish_dec_blk_3way); +} + +static unsigned int __cbc_encrypt(struct blkcipher_desc *desc, + struct blkcipher_walk *walk) +{ + struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + unsigned int bsize = TF_BLOCK_SIZE; + unsigned int nbytes = walk->nbytes; + u128 *src = (u128 *)walk->src.virt.addr; + u128 *dst = (u128 *)walk->dst.virt.addr; + u128 *iv = (u128 *)walk->iv; + + do { + u128_xor(dst, src, iv); + twofish_enc_blk(ctx, (u8 *)dst, (u8 *)dst); + iv = dst; + + src += 1; + dst += 1; + nbytes -= bsize; + } while (nbytes >= bsize); + + u128_xor((u128 *)walk->iv, (u128 *)walk->iv, iv); + return nbytes; +} + +static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct blkcipher_walk walk; + int err; + + blkcipher_walk_init(&walk, dst, src, nbytes); + err = blkcipher_walk_virt(desc, &walk); + + while ((nbytes = walk.nbytes)) { + nbytes = __cbc_encrypt(desc, &walk); + err = blkcipher_walk_done(desc, &walk, nbytes); + } + + return err; +} + +static unsigned int __cbc_decrypt(struct blkcipher_desc *desc, + struct blkcipher_walk *walk) +{ + struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + unsigned int bsize = TF_BLOCK_SIZE; + unsigned int nbytes = walk->nbytes; + u128 *src = (u128 *)walk->src.virt.addr; + u128 *dst = (u128 *)walk->dst.virt.addr; + u128 ivs[3 - 1]; + u128 last_iv; + + /* Start of the last block. */ + src += nbytes / bsize - 1; + dst += nbytes / bsize - 1; + + last_iv = *src; + + /* Process three block batch */ + if (nbytes >= bsize * 3) { + do { + nbytes -= bsize * (3 - 1); + src -= 3 - 1; + dst -= 3 - 1; + + ivs[0] = src[0]; + ivs[1] = src[1]; + + twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src); + + u128_xor(dst + 1, dst + 1, ivs + 0); + u128_xor(dst + 2, dst + 2, ivs + 1); + + nbytes -= bsize; + if (nbytes < bsize) + goto done; + + u128_xor(dst, dst, src - 1); + src -= 1; + dst -= 1; + } while (nbytes >= bsize * 3); + + if (nbytes < bsize) + goto done; + } + + /* Handle leftovers */ + for (;;) { + twofish_dec_blk(ctx, (u8 *)dst, (u8 *)src); + + nbytes -= bsize; + if (nbytes < bsize) + break; + + u128_xor(dst, dst, src - 1); + src -= 1; + dst -= 1; + } + +done: + u128_xor(dst, dst, (u128 *)walk->iv); + *(u128 *)walk->iv = last_iv; + + return nbytes; +} + +static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct blkcipher_walk walk; + int err; + + blkcipher_walk_init(&walk, dst, src, nbytes); + err = blkcipher_walk_virt(desc, &walk); + + while ((nbytes = walk.nbytes)) { + nbytes = __cbc_decrypt(desc, &walk); + err = blkcipher_walk_done(desc, &walk, nbytes); + } + + return err; +} + +static inline void u128_to_be128(be128 *dst, const u128 *src) +{ + dst->a = cpu_to_be64(src->a); + dst->b = cpu_to_be64(src->b); +} + +static inline void be128_to_u128(u128 *dst, const be128 *src) +{ + dst->a = be64_to_cpu(src->a); + dst->b = be64_to_cpu(src->b); +} + +static inline void u128_inc(u128 *i) +{ + i->b++; + if (!i->b) + i->a++; +} + +static void ctr_crypt_final(struct blkcipher_desc *desc, + struct blkcipher_walk *walk) +{ + struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + u8 *ctrblk = walk->iv; + u8 keystream[TF_BLOCK_SIZE]; + u8 *src = walk->src.virt.addr; + u8 *dst = walk->dst.virt.addr; + unsigned int nbytes = walk->nbytes; + + twofish_enc_blk(ctx, keystream, ctrblk); + crypto_xor(keystream, src, nbytes); + memcpy(dst, keystream, nbytes); + + crypto_inc(ctrblk, TF_BLOCK_SIZE); +} + +static unsigned int __ctr_crypt(struct blkcipher_desc *desc, + struct blkcipher_walk *walk) +{ + struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + unsigned int bsize = TF_BLOCK_SIZE; + unsigned int nbytes = walk->nbytes; + u128 *src = (u128 *)walk->src.virt.addr; + u128 *dst = (u128 *)walk->dst.virt.addr; + u128 ctrblk; + be128 ctrblocks[3]; + + be128_to_u128(&ctrblk, (be128 *)walk->iv); + + /* Process three block batch */ + if (nbytes >= bsize * 3) { + do { + if (dst != src) { + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + } + + /* create ctrblks for parallel encrypt */ + u128_to_be128(&ctrblocks[0], &ctrblk); + u128_inc(&ctrblk); + u128_to_be128(&ctrblocks[1], &ctrblk); + u128_inc(&ctrblk); + u128_to_be128(&ctrblocks[2], &ctrblk); + u128_inc(&ctrblk); + + twofish_enc_blk_xor_3way(ctx, (u8 *)dst, + (u8 *)ctrblocks); + + src += 3; + dst += 3; + nbytes -= bsize * 3; + } while (nbytes >= bsize * 3); + + if (nbytes < bsize) + goto done; + } + + /* Handle leftovers */ + do { + if (dst != src) + *dst = *src; + + u128_to_be128(&ctrblocks[0], &ctrblk); + u128_inc(&ctrblk); + + twofish_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks); + u128_xor(dst, dst, (u128 *)ctrblocks); + + src += 1; + dst += 1; + nbytes -= bsize; + } while (nbytes >= bsize); + +done: + u128_to_be128((be128 *)walk->iv, &ctrblk); + return nbytes; +} + +static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct blkcipher_walk walk; + int err; + + blkcipher_walk_init(&walk, dst, src, nbytes); + err = blkcipher_walk_virt_block(desc, &walk, TF_BLOCK_SIZE); + + while ((nbytes = walk.nbytes) >= TF_BLOCK_SIZE) { + nbytes = __ctr_crypt(desc, &walk); + err = blkcipher_walk_done(desc, &walk, nbytes); + } + + if (walk.nbytes) { + ctr_crypt_final(desc, &walk); + err = blkcipher_walk_done(desc, &walk, 0); + } + + return err; +} + +static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) +{ + const unsigned int bsize = TF_BLOCK_SIZE; + struct twofish_ctx *ctx = priv; + int i; + + if (nbytes == 3 * bsize) { + twofish_enc_blk_3way(ctx, srcdst, srcdst); + return; + } + + for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) + twofish_enc_blk(ctx, srcdst, srcdst); +} + +static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) +{ + const unsigned int bsize = TF_BLOCK_SIZE; + struct twofish_ctx *ctx = priv; + int i; + + if (nbytes == 3 * bsize) { + twofish_dec_blk_3way(ctx, srcdst, srcdst); + return; + } + + for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) + twofish_dec_blk(ctx, srcdst, srcdst); +} + +struct twofish_lrw_ctx { + struct lrw_table_ctx lrw_table; + struct twofish_ctx twofish_ctx; +}; + +static int lrw_twofish_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int keylen) +{ + struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm); + int err; + + err = __twofish_setkey(&ctx->twofish_ctx, key, keylen - TF_BLOCK_SIZE, + &tfm->crt_flags); + if (err) + return err; + + return lrw_init_table(&ctx->lrw_table, key + keylen - TF_BLOCK_SIZE); +} + +static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + be128 buf[3]; + struct lrw_crypt_req req = { + .tbuf = buf, + .tbuflen = sizeof(buf), + + .table_ctx = &ctx->lrw_table, + .crypt_ctx = &ctx->twofish_ctx, + .crypt_fn = encrypt_callback, + }; + + return lrw_crypt(desc, dst, src, nbytes, &req); +} + +static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + be128 buf[3]; + struct lrw_crypt_req req = { + .tbuf = buf, + .tbuflen = sizeof(buf), + + .table_ctx = &ctx->lrw_table, + .crypt_ctx = &ctx->twofish_ctx, + .crypt_fn = decrypt_callback, + }; + + return lrw_crypt(desc, dst, src, nbytes, &req); +} + +static void lrw_exit_tfm(struct crypto_tfm *tfm) +{ + struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm); + + lrw_free_table(&ctx->lrw_table); +} + +struct twofish_xts_ctx { + struct twofish_ctx tweak_ctx; + struct twofish_ctx crypt_ctx; +}; + +static int xts_twofish_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int keylen) +{ + struct twofish_xts_ctx *ctx = crypto_tfm_ctx(tfm); + u32 *flags = &tfm->crt_flags; + int err; + + /* key consists of keys of equal size concatenated, therefore + * the length must be even + */ + if (keylen % 2) { + *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; + return -EINVAL; + } + + /* first half of xts-key is for crypt */ + err = __twofish_setkey(&ctx->crypt_ctx, key, keylen / 2, flags); + if (err) + return err; + + /* second half of xts-key is for tweak */ + return __twofish_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2, + flags); +} + +static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + be128 buf[3]; + struct xts_crypt_req req = { + .tbuf = buf, + .tbuflen = sizeof(buf), + + .tweak_ctx = &ctx->tweak_ctx, + .tweak_fn = XTS_TWEAK_CAST(twofish_enc_blk), + .crypt_ctx = &ctx->crypt_ctx, + .crypt_fn = encrypt_callback, + }; + + return xts_crypt(desc, dst, src, nbytes, &req); +} + +static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + be128 buf[3]; + struct xts_crypt_req req = { + .tbuf = buf, + .tbuflen = sizeof(buf), + + .tweak_ctx = &ctx->tweak_ctx, + .tweak_fn = XTS_TWEAK_CAST(twofish_enc_blk), + .crypt_ctx = &ctx->crypt_ctx, + .crypt_fn = decrypt_callback, + }; + + return xts_crypt(desc, dst, src, nbytes, &req); +} + +static struct crypto_alg tf_algs[5] = { { + .cra_name = "ecb(twofish)", + .cra_driver_name = "ecb-twofish-3way", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = TF_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct twofish_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(tf_algs[0].cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = TF_MIN_KEY_SIZE, + .max_keysize = TF_MAX_KEY_SIZE, + .setkey = twofish_setkey, + .encrypt = ecb_encrypt, + .decrypt = ecb_decrypt, + }, + }, +}, { + .cra_name = "cbc(twofish)", + .cra_driver_name = "cbc-twofish-3way", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = TF_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct twofish_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(tf_algs[1].cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = TF_MIN_KEY_SIZE, + .max_keysize = TF_MAX_KEY_SIZE, + .ivsize = TF_BLOCK_SIZE, + .setkey = twofish_setkey, + .encrypt = cbc_encrypt, + .decrypt = cbc_decrypt, + }, + }, +}, { + .cra_name = "ctr(twofish)", + .cra_driver_name = "ctr-twofish-3way", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = 1, + .cra_ctxsize = sizeof(struct twofish_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(tf_algs[2].cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = TF_MIN_KEY_SIZE, + .max_keysize = TF_MAX_KEY_SIZE, + .ivsize = TF_BLOCK_SIZE, + .setkey = twofish_setkey, + .encrypt = ctr_crypt, + .decrypt = ctr_crypt, + }, + }, +}, { + .cra_name = "lrw(twofish)", + .cra_driver_name = "lrw-twofish-3way", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = TF_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct twofish_lrw_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(tf_algs[3].cra_list), + .cra_exit = lrw_exit_tfm, + .cra_u = { + .blkcipher = { + .min_keysize = TF_MIN_KEY_SIZE + TF_BLOCK_SIZE, + .max_keysize = TF_MAX_KEY_SIZE + TF_BLOCK_SIZE, + .ivsize = TF_BLOCK_SIZE, + .setkey = lrw_twofish_setkey, + .encrypt = lrw_encrypt, + .decrypt = lrw_decrypt, + }, + }, +}, { + .cra_name = "xts(twofish)", + .cra_driver_name = "xts-twofish-3way", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = TF_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct twofish_xts_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(tf_algs[4].cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = TF_MIN_KEY_SIZE * 2, + .max_keysize = TF_MAX_KEY_SIZE * 2, + .ivsize = TF_BLOCK_SIZE, + .setkey = xts_twofish_setkey, + .encrypt = xts_encrypt, + .decrypt = xts_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 parallellism 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 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_algs(tf_algs, ARRAY_SIZE(tf_algs)); +} + +static void __exit fini(void) +{ + crypto_unregister_algs(tf_algs, ARRAY_SIZE(tf_algs)); +} + +module_init(init); +module_exit(fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized"); +MODULE_ALIAS("twofish"); +MODULE_ALIAS("twofish-asm"); |