/*
* Glue Code for SSE2 assembler versions of Serpent Cipher
*
* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
*
* Glue code based on aesni-intel_glue.c by:
* Copyright (C) 2008, Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* 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 <linux/module.h>
#include <linux/hardirq.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/ablk_helper.h>
#include <crypto/algapi.h>
#include <crypto/serpent.h>
#include <crypto/cryptd.h>
#include <crypto/b128ops.h>
#include <crypto/ctr.h>
#include <asm/crypto/serpent-sse2.h>
#include <asm/crypto/glue_helper.h>
static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
{
u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
unsigned int j;
for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
ivs[j] = src[j];
serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
}
static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
{
be128 ctrblk;
le128_to_be128(&ctrblk, iv);
le128_inc(iv);
__serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
u128_xor(dst, src, (u128 *)&ctrblk);
}
static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
le128 *iv)
{
be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
unsigned int i;
for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
if (dst != src)
dst[i] = src[i];
le128_to_be128(&ctrblks[i], iv);
le128_inc(iv);
}
serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
}
static const struct common_glue_ctx serpent_enc = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
}, {
.num_blocks = 1,
.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
} }
};
static const struct common_glue_ctx serpent_ctr = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
}, {
.num_blocks = 1,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
} }
};
static const struct common_glue_ctx serpent_dec = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
}, {
.num_blocks = 1,
.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
} }
};
static const struct common_glue_ctx serpent_dec_cbc = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
}, {
.num_blocks = 1,
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
} }
};
static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
}
static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
}
static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
dst, src, nbytes);
}
static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
nbytes);
}
static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
}
static struct crypto_alg serpent_algs[] = { {
.cra_name = "__ecb-serpent-sse2",
.cra_driver_name = "__driver-ecb-serpent-sse2",
.cra_priority = 0,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_INTERNAL,
.cra_blocksize = SERPENT_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct serpent_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.setkey = serpent_setkey,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
},
},
}, {
.cra_name = "__cbc-serpent-sse2",
.cra_driver_name = "__driver-cbc-serpent-sse2",
.cra_priority = 0,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_INTERNAL,
.cra_blocksize = SERPENT_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct serpent_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.setkey = serpent_setkey,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
},
},
}, {
.cra_name = "__ctr-serpent-sse2",
.cra_driver_name = "__driver-ctr-serpent-sse2",
.cra_priority = 0,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_INTERNAL,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct serpent_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.setkey = serpent_setkey,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
},
},
}, {
.cra_name = "ecb(serpent)",
.cra_driver_name = "ecb-serpent-sse2",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = SERPENT_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
}, {
.cra_name = "cbc(serpent)",
.cra_driver_name = "cbc-serpent-sse2",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = SERPENT_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = __ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
}, {
.cra_name = "ctr(serpent)",
.cra_driver_name = "ctr-serpent-sse2",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_encrypt,
.geniv = "chainiv",
},
},
} };
static int __init serpent_sse2_init(void)
{
if (!boot_cpu_has(X86_FEATURE_XMM2)) {
printk(KERN_INFO "SSE2 instructions are not detected.\n");
return -ENODEV;
}
return crypto_register_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
}
static void __exit serpent_sse2_exit(void)
{
crypto_unregister_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
}
module_init(serpent_sse2_init);
module_exit(serpent_sse2_exit);
MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("serpent");
