241 lines
6.6 KiB
C
241 lines
6.6 KiB
C
/*
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* Glue Code for SSE2 assembler versions of Serpent Cipher
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* Glue code based on aesni-intel_glue.c by:
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* Copyright (C) 2008, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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* CTR part based on code (crypto/ctr.c) by:
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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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/b128ops.h>
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#include <crypto/internal/simd.h>
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#include <crypto/serpent.h>
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#include <asm/crypto/serpent-sse2.h>
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#include <asm/crypto/glue_helper.h>
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static int serpent_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 __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
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}
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static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
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{
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u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
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unsigned int j;
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for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
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ivs[j] = src[j];
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serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
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for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
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u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
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}
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static void serpent_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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__serpent_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 void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
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le128 *iv)
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{
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be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
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unsigned int i;
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for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
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if (dst != src)
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dst[i] = src[i];
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le128_to_be128(&ctrblks[i], iv);
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le128_inc(iv);
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}
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serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
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}
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static const struct common_glue_ctx serpent_enc = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_ctr = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
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} }
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};
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static const struct common_glue_ctx serpent_dec = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_dec_cbc = {
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.num_funcs = 2,
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.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
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.funcs = { {
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.num_blocks = SERPENT_PARALLEL_BLOCKS,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
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}, {
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.num_blocks = 1,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
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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(&serpent_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(&serpent_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(__serpent_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(&serpent_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(&serpent_ctr, req);
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}
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static struct skcipher_alg serpent_algs[] = {
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{
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.base.cra_name = "__ecb(serpent)",
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.base.cra_driver_name = "__ecb-serpent-sse2",
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.base.cra_priority = 400,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = serpent_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(serpent)",
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.base.cra_driver_name = "__cbc-serpent-sse2",
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.base.cra_priority = 400,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = serpent_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(serpent)",
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.base.cra_driver_name = "__ctr-serpent-sse2",
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.base.cra_priority = 400,
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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 serpent_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.chunksize = SERPENT_BLOCK_SIZE,
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.setkey = serpent_setkey_skcipher,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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},
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};
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static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
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static int __init serpent_sse2_init(void)
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{
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if (!boot_cpu_has(X86_FEATURE_XMM2)) {
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printk(KERN_INFO "SSE2 instructions are not detected.\n");
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return -ENODEV;
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}
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return simd_register_skciphers_compat(serpent_algs,
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ARRAY_SIZE(serpent_algs),
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serpent_simd_algs);
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}
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static void __exit serpent_sse2_exit(void)
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{
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simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
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serpent_simd_algs);
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}
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module_init(serpent_sse2_init);
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module_exit(serpent_sse2_exit);
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MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("serpent");
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