1 files changed, 149 insertions, 0 deletions

diff --git a/arch/x86/crypto/ablk_helper.c b/arch/x86/crypto/ablk_helper.c
new file mode 100644
index 000000000000..43282fe04a8b
--- /dev/null
+++ b/arch/x86/crypto/ablk_helper.c
@@ -0,0 +1,149 @@
+/*
+ * Shared async block cipher helpers
+ *
+ * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *
+ * Based on aesni-intel_glue.c by:
+ *  Copyright (C) 2008, 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ * USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <crypto/algapi.h>
+#include <crypto/cryptd.h>
+#include <asm/i387.h>
+#include <asm/crypto/ablk_helper.h>
+
+int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
+                 unsigned int key_len)
+{
+        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+        struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
+        int err;
+
+        crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+        crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
+                                    & CRYPTO_TFM_REQ_MASK);
+        err = crypto_ablkcipher_setkey(child, key, key_len);
+        crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
+                                    & CRYPTO_TFM_RES_MASK);
+        return err;
+}
+EXPORT_SYMBOL_GPL(ablk_set_key);
+
+int __ablk_encrypt(struct ablkcipher_request *req)
+{
+        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
+        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+        struct blkcipher_desc desc;
+
+        desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
+        desc.info = req->info;
+        desc.flags = 0;
+
+        return crypto_blkcipher_crt(desc.tfm)->encrypt(
+                &desc, req->dst, req->src, req->nbytes);
+}
+EXPORT_SYMBOL_GPL(__ablk_encrypt);
+
+int ablk_encrypt(struct ablkcipher_request *req)
+{
+        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
+        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+
+        if (!irq_fpu_usable()) {
+                struct ablkcipher_request *cryptd_req =
+                        ablkcipher_request_ctx(req);
+
+                memcpy(cryptd_req, req, sizeof(*req));
+                ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
+
+                return crypto_ablkcipher_encrypt(cryptd_req);
+        } else {
+                return __ablk_encrypt(req);
+        }
+}
+EXPORT_SYMBOL_GPL(ablk_encrypt);
+
+int ablk_decrypt(struct ablkcipher_request *req)
+{
+        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
+        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+
+        if (!irq_fpu_usable()) {
+                struct ablkcipher_request *cryptd_req =
+                        ablkcipher_request_ctx(req);
+
+                memcpy(cryptd_req, req, sizeof(*req));
+                ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
+
+                return crypto_ablkcipher_decrypt(cryptd_req);
+        } else {
+                struct blkcipher_desc desc;
+
+                desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
+                desc.info = req->info;
+                desc.flags = 0;
+
+                return crypto_blkcipher_crt(desc.tfm)->decrypt(
+                        &desc, req->dst, req->src, req->nbytes);
+        }
+}
+EXPORT_SYMBOL_GPL(ablk_decrypt);
+
+void ablk_exit(struct crypto_tfm *tfm)
+{
+        struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        cryptd_free_ablkcipher(ctx->cryptd_tfm);
+}
+EXPORT_SYMBOL_GPL(ablk_exit);
+
+int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
+{
+        struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
+        struct cryptd_ablkcipher *cryptd_tfm;
+
+        cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, 0, 0);
+        if (IS_ERR(cryptd_tfm))
+                return PTR_ERR(cryptd_tfm);
+
+        ctx->cryptd_tfm = cryptd_tfm;
+        tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
+                crypto_ablkcipher_reqsize(&cryptd_tfm->base);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ablk_init_common);
+
+int ablk_init(struct crypto_tfm *tfm)
+{
+        char drv_name[CRYPTO_MAX_ALG_NAME];
+
+        snprintf(drv_name, sizeof(drv_name), "__driver-%s",
+                                        crypto_tfm_alg_driver_name(tfm));
+
+        return ablk_init_common(tfm, drv_name);
+}
+EXPORT_SYMBOL_GPL(ablk_init);
+
+MODULE_LICENSE("GPL");