[deliverable/linux.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 <asm/i387.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,
};

static int __init crypto_fpu_module_init(void)
{
	return crypto_register_template(&crypto_fpu_tmpl);
}

static void __exit crypto_fpu_module_exit(void)
{
	crypto_unregister_template(&crypto_fpu_tmpl);
}

module_init(crypto_fpu_module_init);
module_exit(crypto_fpu_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("FPU block cipher wrapper");
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>
	19	#include <asm/i387.h>
	20
	21	struct crypto_fpu_ctx {
	22	struct crypto_blkcipher *child;
	23	};
	24
	25	static int crypto_fpu_setkey(struct crypto_tfm parent, const u8 key,
	26	unsigned int keylen)
	27	{
	28	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);
	29	struct crypto_blkcipher *child = ctx->child;
	30	int err;
	31
	32	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	33	crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
	34	CRYPTO_TFM_REQ_MASK);
	35	err = crypto_blkcipher_setkey(child, key, keylen);
	36	crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
	37	CRYPTO_TFM_RES_MASK);
	38	return err;
	39	}
	40
	41	static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,
	42	struct scatterlist dst, struct scatterlist src,
	43	unsigned int nbytes)
	44	{
	45	int err;
	46	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
	47	struct crypto_blkcipher *child = ctx->child;
	48	struct blkcipher_desc desc = {
	49	.tfm = child,
	50	.info = desc_in->info,
b6f34d44	51	.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
150c7e85 HY	52	};
	53
	54	kernel_fpu_begin();
	55	err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);
	56	kernel_fpu_end();
	57	return err;
	58	}
	59
	60	static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,
	61	struct scatterlist dst, struct scatterlist src,
	62	unsigned int nbytes)
	63	{
	64	int err;
	65	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
	66	struct crypto_blkcipher *child = ctx->child;
	67	struct blkcipher_desc desc = {
	68	.tfm = child,
	69	.info = desc_in->info,
b6f34d44	70	.flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
150c7e85 HY	71	};
	72
	73	kernel_fpu_begin();
	74	err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);
	75	kernel_fpu_end();
	76	return err;
	77	}
	78
	79	static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)
	80	{
	81	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	82	struct crypto_spawn *spawn = crypto_instance_ctx(inst);
	83	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
	84	struct crypto_blkcipher *cipher;
	85
	86	cipher = crypto_spawn_blkcipher(spawn);
	87	if (IS_ERR(cipher))
	88	return PTR_ERR(cipher);
	89
	90	ctx->child = cipher;
	91	return 0;
	92	}
	93
	94	static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)
	95	{
	96	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
	97	crypto_free_blkcipher(ctx->child);
	98	}
	99
	100	static struct crypto_instance crypto_fpu_alloc(struct rtattr *tb)
	101	{
	102	struct crypto_instance *inst;
	103	struct crypto_alg *alg;
	104	int err;
	105
	106	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
	107	if (err)
	108	return ERR_PTR(err);
	109
	110	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
	111	CRYPTO_ALG_TYPE_MASK);
	112	if (IS_ERR(alg))
	113	return ERR_CAST(alg);
	114
	115	inst = crypto_alloc_instance("fpu", alg);
	116	if (IS_ERR(inst))
	117	goto out_put_alg;
	118
	119	inst->alg.cra_flags = alg->cra_flags;
	120	inst->alg.cra_priority = alg->cra_priority;
	121	inst->alg.cra_blocksize = alg->cra_blocksize;
	122	inst->alg.cra_alignmask = alg->cra_alignmask;
	123	inst->alg.cra_type = alg->cra_type;
	124	inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize;
	125	inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	126	inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	127	inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx);
	128	inst->alg.cra_init = crypto_fpu_init_tfm;
	129	inst->alg.cra_exit = crypto_fpu_exit_tfm;
	130	inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey;
	131	inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt;
	132	inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt;
	133
	134	out_put_alg:
135	crypto_mod_put(alg);
136	return inst;
137	}
138
139	static void crypto_fpu_free(struct crypto_instance *inst)
140	{
141	crypto_drop_spawn(crypto_instance_ctx(inst));
142	kfree(inst);
143	}
144
145	static struct crypto_template crypto_fpu_tmpl = {
146	.name = "fpu",
147	.alloc = crypto_fpu_alloc,
148	.free = crypto_fpu_free,
149	.module = THIS_MODULE,
150	};
151
152	static int __init crypto_fpu_module_init(void)
153	{
154	return crypto_register_template(&crypto_fpu_tmpl);
155	}
156
157	static void __exit crypto_fpu_module_exit(void)
158	{
159	crypto_unregister_template(&crypto_fpu_tmpl);
160	}
161
162	module_init(crypto_fpu_module_init);
163	module_exit(crypto_fpu_module_exit);
164
165	MODULE_LICENSE("GPL");
166	MODULE_DESCRIPTION("FPU block cipher wrapper");