321 lines
8.7 KiB
C
321 lines
8.7 KiB
C
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/*
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* Glue Code for the AVX assembler implemention of the Cast6 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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* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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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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#include <linux/module.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/cast6.h>
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#include <crypto/internal/simd.h>
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#include <crypto/xts.h>
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#include <asm/crypto/glue_helper.h>
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#define CAST6_PARALLEL_BLOCKS 8
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asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
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le128 *iv);
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asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
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const u8 *src, le128 *iv);
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asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
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const u8 *src, le128 *iv);
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static int cast6_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 cast6_setkey(&tfm->base, key, keylen);
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}
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static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
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{
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glue_xts_crypt_128bit_one(ctx, dst, src, iv,
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GLUE_FUNC_CAST(__cast6_encrypt));
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}
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static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
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{
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glue_xts_crypt_128bit_one(ctx, dst, src, iv,
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GLUE_FUNC_CAST(__cast6_decrypt));
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}
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static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
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{
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be128 ctrblk;
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le128_to_be128(&ctrblk, iv);
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le128_inc(iv);
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__cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
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u128_xor(dst, src, (u128 *)&ctrblk);
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}
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static const struct common_glue_ctx cast6_enc = {
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.num_funcs = 2,
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.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = CAST6_PARALLEL_BLOCKS,
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.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
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} }
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};
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static const struct common_glue_ctx cast6_ctr = {
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.num_funcs = 2,
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.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = CAST6_PARALLEL_BLOCKS,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
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} }
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};
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static const struct common_glue_ctx cast6_enc_xts = {
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.num_funcs = 2,
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.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = CAST6_PARALLEL_BLOCKS,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
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} }
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};
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static const struct common_glue_ctx cast6_dec = {
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.num_funcs = 2,
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.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = CAST6_PARALLEL_BLOCKS,
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.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
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} }
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};
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static const struct common_glue_ctx cast6_dec_cbc = {
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.num_funcs = 2,
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.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = CAST6_PARALLEL_BLOCKS,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
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} }
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};
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static const struct common_glue_ctx cast6_dec_xts = {
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.num_funcs = 2,
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.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = CAST6_PARALLEL_BLOCKS,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
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} }
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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 glue_ecb_req_128bit(&cast6_enc, req);
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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 glue_ecb_req_128bit(&cast6_dec, req);
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__cast6_encrypt),
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req);
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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return glue_cbc_decrypt_req_128bit(&cast6_dec_cbc, req);
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}
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static int ctr_crypt(struct skcipher_request *req)
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{
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return glue_ctr_req_128bit(&cast6_ctr, req);
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}
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struct cast6_xts_ctx {
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struct cast6_ctx tweak_ctx;
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struct cast6_ctx crypt_ctx;
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};
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static int xts_cast6_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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u32 *flags = &tfm->base.crt_flags;
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int err;
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err = xts_verify_key(tfm, key, keylen);
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if (err)
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return err;
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/* first half of xts-key is for crypt */
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err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
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if (err)
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return err;
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/* second half of xts-key is for tweak */
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return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
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flags);
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}
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static int xts_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 cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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return glue_xts_req_128bit(&cast6_enc_xts, req,
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XTS_TWEAK_CAST(__cast6_encrypt),
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&ctx->tweak_ctx, &ctx->crypt_ctx);
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}
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static int xts_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 cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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return glue_xts_req_128bit(&cast6_dec_xts, req,
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XTS_TWEAK_CAST(__cast6_encrypt),
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&ctx->tweak_ctx, &ctx->crypt_ctx);
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}
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static struct skcipher_alg cast6_algs[] = {
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{
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.base.cra_name = "__ecb(cast6)",
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.base.cra_driver_name = "__ecb-cast6-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST6_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast6_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST6_MIN_KEY_SIZE,
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.max_keysize = CAST6_MAX_KEY_SIZE,
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.setkey = cast6_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(cast6)",
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.base.cra_driver_name = "__cbc-cast6-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST6_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast6_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST6_MIN_KEY_SIZE,
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.max_keysize = CAST6_MAX_KEY_SIZE,
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.ivsize = CAST6_BLOCK_SIZE,
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.setkey = cast6_setkey_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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}, {
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.base.cra_name = "__ctr(cast6)",
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.base.cra_driver_name = "__ctr-cast6-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct cast6_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST6_MIN_KEY_SIZE,
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.max_keysize = CAST6_MAX_KEY_SIZE,
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.ivsize = CAST6_BLOCK_SIZE,
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.chunksize = CAST6_BLOCK_SIZE,
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.setkey = cast6_setkey_skcipher,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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}, {
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.base.cra_name = "__xts(cast6)",
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.base.cra_driver_name = "__xts-cast6-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST6_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast6_xts_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = 2 * CAST6_MIN_KEY_SIZE,
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.max_keysize = 2 * CAST6_MAX_KEY_SIZE,
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.ivsize = CAST6_BLOCK_SIZE,
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.setkey = xts_cast6_setkey,
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.encrypt = xts_encrypt,
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.decrypt = xts_decrypt,
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},
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};
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static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
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static int __init cast6_init(void)
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{
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const char *feature_name;
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if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
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&feature_name)) {
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pr_info("CPU feature '%s' is not supported.\n", feature_name);
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return -ENODEV;
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}
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return simd_register_skciphers_compat(cast6_algs,
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ARRAY_SIZE(cast6_algs),
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cast6_simd_algs);
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}
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static void __exit cast6_exit(void)
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{
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simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
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cast6_simd_algs);
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}
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module_init(cast6_init);
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module_exit(cast6_exit);
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MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("cast6");
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