crypto: simd - Add simd skcipher helper
This patch adds the simd skcipher helper which is meant to be
a replacement for ablk helper. It replaces the underlying blkcipher
interface with skcipher, and also presents the top-level algorithm
as an skcipher.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/simd.c b/crypto/simd.c
new file mode 100644
index 0000000..8820337
--- /dev/null
+++ b/crypto/simd.c
@@ -0,0 +1,226 @@
+/*
+ * Shared crypto simd helpers
+ *
+ * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * 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 <crypto/cryptd.h>
+#include <crypto/internal/simd.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <asm/simd.h>
+
+struct simd_skcipher_alg {
+ const char *ialg_name;
+ struct skcipher_alg alg;
+};
+
+struct simd_skcipher_ctx {
+ struct cryptd_skcipher *cryptd_tfm;
+};
+
+static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
+ int err;
+
+ crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MASK);
+ err = crypto_skcipher_setkey(child, key, key_len);
+ crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
+ CRYPTO_TFM_RES_MASK);
+ return err;
+}
+
+static int simd_skcipher_encrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_request *subreq;
+ struct crypto_skcipher *child;
+
+ subreq = skcipher_request_ctx(req);
+ *subreq = *req;
+
+ if (!may_use_simd() ||
+ (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
+ child = &ctx->cryptd_tfm->base;
+ else
+ child = cryptd_skcipher_child(ctx->cryptd_tfm);
+
+ skcipher_request_set_tfm(subreq, child);
+
+ return crypto_skcipher_encrypt(subreq);
+}
+
+static int simd_skcipher_decrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_request *subreq;
+ struct crypto_skcipher *child;
+
+ subreq = skcipher_request_ctx(req);
+ *subreq = *req;
+
+ if (!may_use_simd() ||
+ (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
+ child = &ctx->cryptd_tfm->base;
+ else
+ child = cryptd_skcipher_child(ctx->cryptd_tfm);
+
+ skcipher_request_set_tfm(subreq, child);
+
+ return crypto_skcipher_decrypt(subreq);
+}
+
+static void simd_skcipher_exit(struct crypto_skcipher *tfm)
+{
+ struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+ cryptd_free_skcipher(ctx->cryptd_tfm);
+}
+
+static int simd_skcipher_init(struct crypto_skcipher *tfm)
+{
+ struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct cryptd_skcipher *cryptd_tfm;
+ struct simd_skcipher_alg *salg;
+ struct skcipher_alg *alg;
+ unsigned reqsize;
+
+ alg = crypto_skcipher_alg(tfm);
+ salg = container_of(alg, struct simd_skcipher_alg, alg);
+
+ cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
+ CRYPTO_ALG_INTERNAL,
+ CRYPTO_ALG_INTERNAL);
+ if (IS_ERR(cryptd_tfm))
+ return PTR_ERR(cryptd_tfm);
+
+ ctx->cryptd_tfm = cryptd_tfm;
+
+ reqsize = sizeof(struct skcipher_request);
+ reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
+
+ crypto_skcipher_set_reqsize(tfm, reqsize);
+
+ return 0;
+}
+
+struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
+ const char *drvname,
+ const char *basename)
+{
+ struct simd_skcipher_alg *salg;
+ struct crypto_skcipher *tfm;
+ struct skcipher_alg *ialg;
+ struct skcipher_alg *alg;
+ int err;
+
+ tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
+ CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm))
+ return ERR_CAST(tfm);
+
+ ialg = crypto_skcipher_alg(tfm);
+
+ salg = kzalloc(sizeof(*salg), GFP_KERNEL);
+ if (!salg) {
+ salg = ERR_PTR(-ENOMEM);
+ goto out_put_tfm;
+ }
+
+ salg->ialg_name = basename;
+ alg = &salg->alg;
+
+ err = -ENAMETOOLONG;
+ if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
+ CRYPTO_MAX_ALG_NAME)
+ goto out_free_salg;
+
+ if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+ drvname) >= CRYPTO_MAX_ALG_NAME)
+ goto out_free_salg;
+
+ alg->base.cra_flags = CRYPTO_ALG_ASYNC;
+ alg->base.cra_priority = ialg->base.cra_priority;
+ alg->base.cra_blocksize = ialg->base.cra_blocksize;
+ alg->base.cra_alignmask = ialg->base.cra_alignmask;
+ alg->base.cra_module = ialg->base.cra_module;
+ alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
+
+ alg->ivsize = ialg->ivsize;
+ alg->chunksize = ialg->chunksize;
+ alg->min_keysize = ialg->min_keysize;
+ alg->max_keysize = ialg->max_keysize;
+
+ alg->init = simd_skcipher_init;
+ alg->exit = simd_skcipher_exit;
+
+ alg->setkey = simd_skcipher_setkey;
+ alg->encrypt = simd_skcipher_encrypt;
+ alg->decrypt = simd_skcipher_decrypt;
+
+ err = crypto_register_skcipher(alg);
+ if (err)
+ goto out_free_salg;
+
+out_put_tfm:
+ crypto_free_skcipher(tfm);
+ return salg;
+
+out_free_salg:
+ kfree(salg);
+ salg = ERR_PTR(err);
+ goto out_put_tfm;
+}
+EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
+
+struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
+ const char *basename)
+{
+ char drvname[CRYPTO_MAX_ALG_NAME];
+
+ if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
+ CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ return simd_skcipher_create_compat(algname, drvname, basename);
+}
+EXPORT_SYMBOL_GPL(simd_skcipher_create);
+
+void simd_skcipher_free(struct simd_skcipher_alg *salg)
+{
+ crypto_unregister_skcipher(&salg->alg);
+ kfree(salg);
+}
+EXPORT_SYMBOL_GPL(simd_skcipher_free);
+
+MODULE_LICENSE("GPL");
