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- /*
- * 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");
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