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authorHuang Ying <ying.huang@intel.com>2009-03-29 15:39:02 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2009-06-02 14:04:15 +1000
commit150c7e85526e80474b87004f4b420e8834fdeb43 (patch)
tree66ab693aadaacca850f222ac5fa248fddde3ac32 /arch/x86
parent505fd21d6138545aa5e96aa738975e6a9deb98a9 (diff)
crypto: fpu - Add template for blkcipher touching FPU
Blkcipher touching FPU need to be enclosed by kernel_fpu_begin() and kernel_fpu_end(). If they are invoked in cipher algorithm implementation, they will be invoked for each block, so that performance will be hurt, because they are "slow" operations. This patch implements "fpu" template, which makes these operations to be invoked for each request. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/crypto/Makefile2
-rw-r--r--arch/x86/crypto/fpu.c166
2 files changed, 168 insertions, 0 deletions
diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index ebe7deedd5b..cfb0010fa94 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#
+obj-$(CONFIG_CRYPTO_FPU) += fpu.o
+
obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o
obj-$(CONFIG_CRYPTO_TWOFISH_586) += twofish-i586.o
obj-$(CONFIG_CRYPTO_SALSA20_586) += salsa20-i586.o
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");