[linux-2.6-block.git] / arch / x86 / crypto / fpu.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/algapi.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/crypto.h>
#include <asm/fpu/api.h>

struct crypto_fpu_ctx {
	struct crypto_blkcipher *child;
};

static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key,
			     unsigned int keylen)
{
	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);
	struct crypto_blkcipher *child = ctx->child;
	int err;

	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
				   CRYPTO_TFM_REQ_MASK);
	err = crypto_blkcipher_setkey(child, key, keylen);
	crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
				     CRYPTO_TFM_RES_MASK);
	return err;
}

static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,
			      struct scatterlist *dst, struct scatterlist *src,
			      unsigned int nbytes)
{
	int err;
	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
	struct crypto_blkcipher *child = ctx->child;
	struct blkcipher_desc desc = {
		.tfm = child,
		.info = desc_in->info,
		.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
	};

	kernel_fpu_begin();
	err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);
	kernel_fpu_end();
	return err;
}

static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,
			      struct scatterlist *dst, struct scatterlist *src,
			      unsigned int nbytes)
{
	int err;
	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
	struct crypto_blkcipher *child = ctx->child;
	struct blkcipher_desc desc = {
		.tfm = child,
		.info = desc_in->info,
		.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
	};

	kernel_fpu_begin();
	err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);
	kernel_fpu_end();
	return err;
}

static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	struct crypto_spawn *spawn = crypto_instance_ctx(inst);
	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_blkcipher *cipher;

	cipher = crypto_spawn_blkcipher(spawn);
	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	ctx->child = cipher;
	return 0;
}

static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
	crypto_free_blkcipher(ctx->child);
}

static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
	if (err)
		return ERR_PTR(err);

	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
				  CRYPTO_ALG_TYPE_MASK);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	inst = crypto_alloc_instance("fpu", alg);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = alg->cra_flags;
	inst->alg.cra_priority = alg->cra_priority;
	inst->alg.cra_blocksize = alg->cra_blocksize;
	inst->alg.cra_alignmask = alg->cra_alignmask;
	inst->alg.cra_type = alg->cra_type;
	inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize;
	inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx);
	inst->alg.cra_init = crypto_fpu_init_tfm;
	inst->alg.cra_exit = crypto_fpu_exit_tfm;
	inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey;
	inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt;
	inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

static void crypto_fpu_free(struct crypto_instance *inst)
{
	crypto_drop_spawn(crypto_instance_ctx(inst));
	kfree(inst);
}

static struct crypto_template crypto_fpu_tmpl = {
	.name = "fpu",
	.alloc = crypto_fpu_alloc,
	.free = crypto_fpu_free,
	.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");
Commit	Line	Data
150c7e85 HY	1	/*
	2	* FPU: Wrapper for blkcipher touching fpu
	3	*
	4	* Copyright (c) Intel Corp.
	5	* Author: Huang Ying <ying.huang@intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the Free
	9	* Software Foundation; either version 2 of the License, or (at your option)
	10	* any later version.
	11	*
	12	*/
	13
	14	#include <crypto/algapi.h>
	15	#include <linux/err.h>
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
5a0e3ad6	19	#include <linux/slab.h>
4943ba16	20	#include <linux/crypto.h>
df6b35f4	21	#include <asm/fpu/api.h>
150c7e85 HY	22
	23	struct crypto_fpu_ctx {
	24	struct crypto_blkcipher *child;
	25	};
	26
	27	static int crypto_fpu_setkey(struct crypto_tfm parent, const u8 key,
	28	unsigned int keylen)
	29	{
	30	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);
	31	struct crypto_blkcipher *child = ctx->child;
	32	int err;
	33
	34	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	35	crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
	36	CRYPTO_TFM_REQ_MASK);
	37	err = crypto_blkcipher_setkey(child, key, keylen);
	38	crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
	39	CRYPTO_TFM_RES_MASK);
	40	return err;
	41	}
	42
	43	static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,
	44	struct scatterlist dst, struct scatterlist src,
	45	unsigned int nbytes)
	46	{
	47	int err;
	48	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
	49	struct crypto_blkcipher *child = ctx->child;
	50	struct blkcipher_desc desc = {
	51	.tfm = child,
	52	.info = desc_in->info,
b6f34d44	53	.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
150c7e85 HY	54	};
	55
	56	kernel_fpu_begin();
	57	err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);
	58	kernel_fpu_end();
	59	return err;
	60	}
	61
	62	static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,
	63	struct scatterlist dst, struct scatterlist src,
	64	unsigned int nbytes)
	65	{
	66	int err;
	67	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
	68	struct crypto_blkcipher *child = ctx->child;
	69	struct blkcipher_desc desc = {
	70	.tfm = child,
	71	.info = desc_in->info,
b6f34d44	72	.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
150c7e85 HY	73	};
	74
	75	kernel_fpu_begin();
	76	err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);
	77	kernel_fpu_end();
	78	return err;
	79	}
	80
	81	static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)
	82	{
	83	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	84	struct crypto_spawn *spawn = crypto_instance_ctx(inst);
	85	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
	86	struct crypto_blkcipher *cipher;
	87
	88	cipher = crypto_spawn_blkcipher(spawn);
	89	if (IS_ERR(cipher))
	90	return PTR_ERR(cipher);
	91
	92	ctx->child = cipher;
	93	return 0;
	94	}
	95
	96	static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)
	97	{
	98	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
	99	crypto_free_blkcipher(ctx->child);
	100	}
	101
	102	static struct crypto_instance crypto_fpu_alloc(struct rtattr *tb)
	103	{
	104	struct crypto_instance *inst;
	105	struct crypto_alg *alg;
	106	int err;
	107
	108	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
	109	if (err)
	110	return ERR_PTR(err);
	111
	112	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
	113	CRYPTO_ALG_TYPE_MASK);
	114	if (IS_ERR(alg))
	115	return ERR_CAST(alg);
	116
	117	inst = crypto_alloc_instance("fpu", alg);
	118	if (IS_ERR(inst))
	119	goto out_put_alg;
	120
	121	inst->alg.cra_flags = alg->cra_flags;
	122	inst->alg.cra_priority = alg->cra_priority;
	123	inst->alg.cra_blocksize = alg->cra_blocksize;
	124	inst->alg.cra_alignmask = alg->cra_alignmask;
	125	inst->alg.cra_type = alg->cra_type;
	126	inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize;
	127	inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	128	inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	129	inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx);
	130	inst->alg.cra_init = crypto_fpu_init_tfm;
	131	inst->alg.cra_exit = crypto_fpu_exit_tfm;
	132	inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey;
	133	inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt;
	134	inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt;
	135
	136	out_put_alg:
137	crypto_mod_put(alg);
138	return inst;
139	}
140
141	static void crypto_fpu_free(struct crypto_instance *inst)
142	{
143	crypto_drop_spawn(crypto_instance_ctx(inst));
144	kfree(inst);
145	}
146
147	static struct crypto_template crypto_fpu_tmpl = {
148	.name = "fpu",
149	.alloc = crypto_fpu_alloc,
150	.free = crypto_fpu_free,
151	.module = THIS_MODULE,
152	};
153
b23b6451	154	int __init crypto_fpu_init(void)
150c7e85 HY	155	{
	156	return crypto_register_template(&crypto_fpu_tmpl);
	157	}
	158
de1e0087	159	void crypto_fpu_exit(void)
150c7e85 HY	160	{
	161	crypto_unregister_template(&crypto_fpu_tmpl);
	162	}
4943ba16 KC	163
4943ba16 KC	164	MODULE_ALIAS_CRYPTO("fpu");