321 lines
8.7 KiB
C
321 lines
8.7 KiB
C
/*
|
|
* Glue Code for the AVX assembler implemention of the Cast6 Cipher
|
|
*
|
|
* Copyright (C) 2012 Johannes Goetzfried
|
|
* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
|
|
*
|
|
* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
|
|
*
|
|
* 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/types.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/err.h>
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/cast6.h>
|
|
#include <crypto/internal/simd.h>
|
|
#include <crypto/xts.h>
|
|
#include <asm/crypto/glue_helper.h>
|
|
|
|
#define CAST6_PARALLEL_BLOCKS 8
|
|
|
|
asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
|
|
const u8 *src);
|
|
asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
|
|
const u8 *src);
|
|
|
|
asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
|
|
const u8 *src);
|
|
asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
|
|
le128 *iv);
|
|
|
|
asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
|
|
const u8 *src, le128 *iv);
|
|
asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
|
|
const u8 *src, le128 *iv);
|
|
|
|
static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
return cast6_setkey(&tfm->base, key, keylen);
|
|
}
|
|
|
|
static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
|
|
{
|
|
glue_xts_crypt_128bit_one(ctx, dst, src, iv,
|
|
GLUE_FUNC_CAST(__cast6_encrypt));
|
|
}
|
|
|
|
static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
|
|
{
|
|
glue_xts_crypt_128bit_one(ctx, dst, src, iv,
|
|
GLUE_FUNC_CAST(__cast6_decrypt));
|
|
}
|
|
|
|
static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
|
|
{
|
|
be128 ctrblk;
|
|
|
|
le128_to_be128(&ctrblk, iv);
|
|
le128_inc(iv);
|
|
|
|
__cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
|
|
u128_xor(dst, src, (u128 *)&ctrblk);
|
|
}
|
|
|
|
static const struct common_glue_ctx cast6_enc = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
|
|
|
|
.funcs = { {
|
|
.num_blocks = CAST6_PARALLEL_BLOCKS,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx cast6_ctr = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
|
|
|
|
.funcs = { {
|
|
.num_blocks = CAST6_PARALLEL_BLOCKS,
|
|
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx cast6_enc_xts = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
|
|
|
|
.funcs = { {
|
|
.num_blocks = CAST6_PARALLEL_BLOCKS,
|
|
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx cast6_dec = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
|
|
|
|
.funcs = { {
|
|
.num_blocks = CAST6_PARALLEL_BLOCKS,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx cast6_dec_cbc = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
|
|
|
|
.funcs = { {
|
|
.num_blocks = CAST6_PARALLEL_BLOCKS,
|
|
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx cast6_dec_xts = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
|
|
|
|
.funcs = { {
|
|
.num_blocks = CAST6_PARALLEL_BLOCKS,
|
|
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
|
|
} }
|
|
};
|
|
|
|
static int ecb_encrypt(struct skcipher_request *req)
|
|
{
|
|
return glue_ecb_req_128bit(&cast6_enc, req);
|
|
}
|
|
|
|
static int ecb_decrypt(struct skcipher_request *req)
|
|
{
|
|
return glue_ecb_req_128bit(&cast6_dec, req);
|
|
}
|
|
|
|
static int cbc_encrypt(struct skcipher_request *req)
|
|
{
|
|
return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__cast6_encrypt),
|
|
req);
|
|
}
|
|
|
|
static int cbc_decrypt(struct skcipher_request *req)
|
|
{
|
|
return glue_cbc_decrypt_req_128bit(&cast6_dec_cbc, req);
|
|
}
|
|
|
|
static int ctr_crypt(struct skcipher_request *req)
|
|
{
|
|
return glue_ctr_req_128bit(&cast6_ctr, req);
|
|
}
|
|
|
|
struct cast6_xts_ctx {
|
|
struct cast6_ctx tweak_ctx;
|
|
struct cast6_ctx crypt_ctx;
|
|
};
|
|
|
|
static int xts_cast6_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
|
|
u32 *flags = &tfm->base.crt_flags;
|
|
int err;
|
|
|
|
err = xts_verify_key(tfm, key, keylen);
|
|
if (err)
|
|
return err;
|
|
|
|
/* first half of xts-key is for crypt */
|
|
err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
|
|
if (err)
|
|
return err;
|
|
|
|
/* second half of xts-key is for tweak */
|
|
return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
|
|
flags);
|
|
}
|
|
|
|
static int xts_encrypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
|
|
|
|
return glue_xts_req_128bit(&cast6_enc_xts, req,
|
|
XTS_TWEAK_CAST(__cast6_encrypt),
|
|
&ctx->tweak_ctx, &ctx->crypt_ctx);
|
|
}
|
|
|
|
static int xts_decrypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
|
|
|
|
return glue_xts_req_128bit(&cast6_dec_xts, req,
|
|
XTS_TWEAK_CAST(__cast6_encrypt),
|
|
&ctx->tweak_ctx, &ctx->crypt_ctx);
|
|
}
|
|
|
|
static struct skcipher_alg cast6_algs[] = {
|
|
{
|
|
.base.cra_name = "__ecb(cast6)",
|
|
.base.cra_driver_name = "__ecb-cast6-avx",
|
|
.base.cra_priority = 200,
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
|
.base.cra_blocksize = CAST6_BLOCK_SIZE,
|
|
.base.cra_ctxsize = sizeof(struct cast6_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
.min_keysize = CAST6_MIN_KEY_SIZE,
|
|
.max_keysize = CAST6_MAX_KEY_SIZE,
|
|
.setkey = cast6_setkey_skcipher,
|
|
.encrypt = ecb_encrypt,
|
|
.decrypt = ecb_decrypt,
|
|
}, {
|
|
.base.cra_name = "__cbc(cast6)",
|
|
.base.cra_driver_name = "__cbc-cast6-avx",
|
|
.base.cra_priority = 200,
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
|
.base.cra_blocksize = CAST6_BLOCK_SIZE,
|
|
.base.cra_ctxsize = sizeof(struct cast6_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
.min_keysize = CAST6_MIN_KEY_SIZE,
|
|
.max_keysize = CAST6_MAX_KEY_SIZE,
|
|
.ivsize = CAST6_BLOCK_SIZE,
|
|
.setkey = cast6_setkey_skcipher,
|
|
.encrypt = cbc_encrypt,
|
|
.decrypt = cbc_decrypt,
|
|
}, {
|
|
.base.cra_name = "__ctr(cast6)",
|
|
.base.cra_driver_name = "__ctr-cast6-avx",
|
|
.base.cra_priority = 200,
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
|
.base.cra_blocksize = 1,
|
|
.base.cra_ctxsize = sizeof(struct cast6_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
.min_keysize = CAST6_MIN_KEY_SIZE,
|
|
.max_keysize = CAST6_MAX_KEY_SIZE,
|
|
.ivsize = CAST6_BLOCK_SIZE,
|
|
.chunksize = CAST6_BLOCK_SIZE,
|
|
.setkey = cast6_setkey_skcipher,
|
|
.encrypt = ctr_crypt,
|
|
.decrypt = ctr_crypt,
|
|
}, {
|
|
.base.cra_name = "__xts(cast6)",
|
|
.base.cra_driver_name = "__xts-cast6-avx",
|
|
.base.cra_priority = 200,
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
|
.base.cra_blocksize = CAST6_BLOCK_SIZE,
|
|
.base.cra_ctxsize = sizeof(struct cast6_xts_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
.min_keysize = 2 * CAST6_MIN_KEY_SIZE,
|
|
.max_keysize = 2 * CAST6_MAX_KEY_SIZE,
|
|
.ivsize = CAST6_BLOCK_SIZE,
|
|
.setkey = xts_cast6_setkey,
|
|
.encrypt = xts_encrypt,
|
|
.decrypt = xts_decrypt,
|
|
},
|
|
};
|
|
|
|
static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
|
|
|
|
static int __init cast6_init(void)
|
|
{
|
|
const char *feature_name;
|
|
|
|
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
|
|
&feature_name)) {
|
|
pr_info("CPU feature '%s' is not supported.\n", feature_name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return simd_register_skciphers_compat(cast6_algs,
|
|
ARRAY_SIZE(cast6_algs),
|
|
cast6_simd_algs);
|
|
}
|
|
|
|
static void __exit cast6_exit(void)
|
|
{
|
|
simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
|
|
cast6_simd_algs);
|
|
}
|
|
|
|
module_init(cast6_init);
|
|
module_exit(cast6_exit);
|
|
|
|
MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CRYPTO("cast6");
|