linux/arch/x86/crypto/fpu.c
Herbert Xu 85671860ca crypto: aesni - Convert to skcipher
This patch converts aesni (including fpu) over to the skcipher
interface.  The LRW implementation has been removed as the generic
LRW code can now be used directly on top of the accelerated ECB
implementation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-11-28 21:23:20 +08:00

208 lines
5.3 KiB
C

/*
* FPU: Wrapper for blkcipher touching fpu
*
* Copyright (c) Intel Corp.
* Author: Huang Ying <ying.huang@intel.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.
*
*/
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/fpu/api.h>
struct crypto_fpu_ctx {
struct crypto_skcipher *child;
};
static int crypto_fpu_setkey(struct crypto_skcipher *parent, const u8 *key,
unsigned int keylen)
{
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(parent);
struct crypto_skcipher *child = ctx->child;
int err;
crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
err = crypto_skcipher_setkey(child, key, keylen);
crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK);
return err;
}
static int crypto_fpu_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *child = ctx->child;
SKCIPHER_REQUEST_ON_STACK(subreq, child);
int err;
skcipher_request_set_tfm(subreq, child);
skcipher_request_set_callback(subreq, 0, NULL, NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
kernel_fpu_begin();
err = crypto_skcipher_encrypt(subreq);
kernel_fpu_end();
skcipher_request_zero(subreq);
return err;
}
static int crypto_fpu_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *child = ctx->child;
SKCIPHER_REQUEST_ON_STACK(subreq, child);
int err;
skcipher_request_set_tfm(subreq, child);
skcipher_request_set_callback(subreq, 0, NULL, NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
kernel_fpu_begin();
err = crypto_skcipher_decrypt(subreq);
kernel_fpu_end();
skcipher_request_zero(subreq);
return err;
}
static int crypto_fpu_init_tfm(struct crypto_skcipher *tfm)
{
struct skcipher_instance *inst = skcipher_alg_instance(tfm);
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher_spawn *spawn;
struct crypto_skcipher *cipher;
spawn = skcipher_instance_ctx(inst);
cipher = crypto_spawn_skcipher(spawn);
if (IS_ERR(cipher))
return PTR_ERR(cipher);
ctx->child = cipher;
return 0;
}
static void crypto_fpu_exit_tfm(struct crypto_skcipher *tfm)
{
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_free_skcipher(ctx->child);
}
static void crypto_fpu_free(struct skcipher_instance *inst)
{
crypto_drop_skcipher(skcipher_instance_ctx(inst));
kfree(inst);
}
static int crypto_fpu_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_skcipher_spawn *spawn;
struct skcipher_instance *inst;
struct crypto_attr_type *algt;
struct skcipher_alg *alg;
const char *cipher_name;
int err;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
if ((algt->type ^ (CRYPTO_ALG_INTERNAL | CRYPTO_ALG_TYPE_SKCIPHER)) &
algt->mask)
return -EINVAL;
if (!(algt->mask & CRYPTO_ALG_INTERNAL))
return -EINVAL;
cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name))
return PTR_ERR(cipher_name);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
return -ENOMEM;
spawn = skcipher_instance_ctx(inst);
crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(spawn, cipher_name, CRYPTO_ALG_INTERNAL,
CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
if (err)
goto out_free_inst;
alg = crypto_skcipher_spawn_alg(spawn);
err = crypto_inst_setname(skcipher_crypto_instance(inst), "fpu",
&alg->base);
if (err)
goto out_drop_skcipher;
inst->alg.base.cra_flags = CRYPTO_ALG_INTERNAL;
inst->alg.base.cra_priority = alg->base.cra_priority;
inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg);
inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg);
inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg);
inst->alg.base.cra_ctxsize = sizeof(struct crypto_fpu_ctx);
inst->alg.init = crypto_fpu_init_tfm;
inst->alg.exit = crypto_fpu_exit_tfm;
inst->alg.setkey = crypto_fpu_setkey;
inst->alg.encrypt = crypto_fpu_encrypt;
inst->alg.decrypt = crypto_fpu_decrypt;
inst->free = crypto_fpu_free;
err = skcipher_register_instance(tmpl, inst);
if (err)
goto out_drop_skcipher;
out:
return err;
out_drop_skcipher:
crypto_drop_skcipher(spawn);
out_free_inst:
kfree(inst);
goto out;
}
static struct crypto_template crypto_fpu_tmpl = {
.name = "fpu",
.create = crypto_fpu_create,
.module = THIS_MODULE,
};
int __init crypto_fpu_init(void)
{
return crypto_register_template(&crypto_fpu_tmpl);
}
void crypto_fpu_exit(void)
{
crypto_unregister_template(&crypto_fpu_tmpl);
}
MODULE_ALIAS_CRYPTO("fpu");