2 * FPU: Wrapper for blkcipher touching fpu
4 * Copyright (c) Intel Corp.
5 * Author: Huang Ying <ying.huang@intel.com>
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)
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 <linux/slab.h>
20 #include <linux/crypto.h>
21 #include <asm/fpu/api.h>
23 struct crypto_fpu_ctx {
24 struct crypto_blkcipher *child;
27 static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key,
30 struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);
31 struct crypto_blkcipher *child = ctx->child;
34 crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
35 crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
37 err = crypto_blkcipher_setkey(child, key, keylen);
38 crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
43 static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,
44 struct scatterlist *dst, struct scatterlist *src,
48 struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
49 struct crypto_blkcipher *child = ctx->child;
50 struct blkcipher_desc desc = {
52 .info = desc_in->info,
53 .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
57 err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);
62 static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,
63 struct scatterlist *dst, struct scatterlist *src,
67 struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
68 struct crypto_blkcipher *child = ctx->child;
69 struct blkcipher_desc desc = {
71 .info = desc_in->info,
72 .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
76 err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);
81 static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)
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;
88 cipher = crypto_spawn_blkcipher(spawn);
90 return PTR_ERR(cipher);
96 static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)
98 struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
99 crypto_free_blkcipher(ctx->child);
102 static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb)
104 struct crypto_instance *inst;
105 struct crypto_alg *alg;
108 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
112 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
113 CRYPTO_ALG_TYPE_MASK);
115 return ERR_CAST(alg);
117 inst = crypto_alloc_instance("fpu", alg);
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;
141 static void crypto_fpu_free(struct crypto_instance *inst)
143 crypto_drop_spawn(crypto_instance_ctx(inst));
147 static struct crypto_template crypto_fpu_tmpl = {
149 .alloc = crypto_fpu_alloc,
150 .free = crypto_fpu_free,
151 .module = THIS_MODULE,
154 int __init crypto_fpu_init(void)
156 return crypto_register_template(&crypto_fpu_tmpl);
159 void __exit crypto_fpu_exit(void)
161 crypto_unregister_template(&crypto_fpu_tmpl);
164 MODULE_ALIAS_CRYPTO("fpu");