aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/crypto/fpu.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/crypto/fpu.c')
-rw-r--r--arch/x86/crypto/fpu.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/x86/crypto/fpu.c b/arch/x86/crypto/fpu.c
new file mode 100644
index 00000000000..5f9781a3815
--- /dev/null
+++ b/arch/x86/crypto/fpu.c
@@ -0,0 +1,166 @@
+/*
+ * 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,
+ };
+
+ 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,
+ };
+
+ 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");