*
* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
* Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
+ * Copyright (c) 2019 Google LLC
*
* Based on aesni-intel_glue.c by:
* Copyright (C) 2008, Intel Corp.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Shared crypto SIMD helpers. These functions dynamically create and register
+ * an skcipher or AEAD algorithm that wraps another, internal algorithm. The
+ * wrapper ensures that the internal algorithm is only executed in a context
+ * where SIMD instructions are usable, i.e. where may_use_simd() returns true.
+ * If SIMD is already usable, the wrapper directly calls the internal algorithm.
+ * Otherwise it defers execution to a workqueue via cryptd.
*
+ * This is an alternative to the internal algorithm implementing a fallback for
+ * the !may_use_simd() case itself.
+ *
+ * Note that the wrapper algorithm is asynchronous, i.e. it has the
+ * CRYPTO_ALG_ASYNC flag set. Therefore it won't be found by users who
+ * explicitly allocate a synchronous algorithm.
*/
#include <crypto/cryptd.h>
+#include <crypto/internal/aead.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <linux/kernel.h>
#include <linux/preempt.h>
#include <asm/simd.h>
+/* skcipher support */
+
struct simd_skcipher_alg {
const char *ialg_name;
struct skcipher_alg alg;
}
EXPORT_SYMBOL_GPL(simd_unregister_skciphers);
+/* AEAD support */
+
+struct simd_aead_alg {
+ const char *ialg_name;
+ struct aead_alg alg;
+};
+
+struct simd_aead_ctx {
+ struct cryptd_aead *cryptd_tfm;
+};
+
+static int simd_aead_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct crypto_aead *child = &ctx->cryptd_tfm->base;
+ int err;
+
+ crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+ crypto_aead_set_flags(child, crypto_aead_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MASK);
+ err = crypto_aead_setkey(child, key, key_len);
+ crypto_aead_set_flags(tfm, crypto_aead_get_flags(child) &
+ CRYPTO_TFM_RES_MASK);
+ return err;
+}
+
+static int simd_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct crypto_aead *child = &ctx->cryptd_tfm->base;
+
+ return crypto_aead_setauthsize(child, authsize);
+}
+
+static int simd_aead_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct aead_request *subreq;
+ struct crypto_aead *child;
+
+ subreq = aead_request_ctx(req);
+ *subreq = *req;
+
+ if (!may_use_simd() ||
+ (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))
+ child = &ctx->cryptd_tfm->base;
+ else
+ child = cryptd_aead_child(ctx->cryptd_tfm);
+
+ aead_request_set_tfm(subreq, child);
+
+ return crypto_aead_encrypt(subreq);
+}
+
+static int simd_aead_decrypt(struct aead_request *req)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct aead_request *subreq;
+ struct crypto_aead *child;
+
+ subreq = aead_request_ctx(req);
+ *subreq = *req;
+
+ if (!may_use_simd() ||
+ (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))
+ child = &ctx->cryptd_tfm->base;
+ else
+ child = cryptd_aead_child(ctx->cryptd_tfm);
+
+ aead_request_set_tfm(subreq, child);
+
+ return crypto_aead_decrypt(subreq);
+}
+
+static void simd_aead_exit(struct crypto_aead *tfm)
+{
+ struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
+
+ cryptd_free_aead(ctx->cryptd_tfm);
+}
+
+static int simd_aead_init(struct crypto_aead *tfm)
+{
+ struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
+ struct cryptd_aead *cryptd_tfm;
+ struct simd_aead_alg *salg;
+ struct aead_alg *alg;
+ unsigned reqsize;
+
+ alg = crypto_aead_alg(tfm);
+ salg = container_of(alg, struct simd_aead_alg, alg);
+
+ cryptd_tfm = cryptd_alloc_aead(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 = crypto_aead_reqsize(cryptd_aead_child(cryptd_tfm));
+ reqsize = max(reqsize, crypto_aead_reqsize(&cryptd_tfm->base));
+ reqsize += sizeof(struct aead_request);
+
+ crypto_aead_set_reqsize(tfm, reqsize);
+
+ return 0;
+}
+
+struct simd_aead_alg *simd_aead_create_compat(const char *algname,
+ const char *drvname,
+ const char *basename)
+{
+ struct simd_aead_alg *salg;
+ struct crypto_aead *tfm;
+ struct aead_alg *ialg;
+ struct aead_alg *alg;
+ int err;
+
+ tfm = crypto_alloc_aead(basename, CRYPTO_ALG_INTERNAL,
+ CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm))
+ return ERR_CAST(tfm);
+
+ ialg = crypto_aead_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_aead_ctx);
+
+ alg->ivsize = ialg->ivsize;
+ alg->maxauthsize = ialg->maxauthsize;
+ alg->chunksize = ialg->chunksize;
+
+ alg->init = simd_aead_init;
+ alg->exit = simd_aead_exit;
+
+ alg->setkey = simd_aead_setkey;
+ alg->setauthsize = simd_aead_setauthsize;
+ alg->encrypt = simd_aead_encrypt;
+ alg->decrypt = simd_aead_decrypt;
+
+ err = crypto_register_aead(alg);
+ if (err)
+ goto out_free_salg;
+
+out_put_tfm:
+ crypto_free_aead(tfm);
+ return salg;
+
+out_free_salg:
+ kfree(salg);
+ salg = ERR_PTR(err);
+ goto out_put_tfm;
+}
+EXPORT_SYMBOL_GPL(simd_aead_create_compat);
+
+struct simd_aead_alg *simd_aead_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_aead_create_compat(algname, drvname, basename);
+}
+EXPORT_SYMBOL_GPL(simd_aead_create);
+
+void simd_aead_free(struct simd_aead_alg *salg)
+{
+ crypto_unregister_aead(&salg->alg);
+ kfree(salg);
+}
+EXPORT_SYMBOL_GPL(simd_aead_free);
+
+int simd_register_aeads_compat(struct aead_alg *algs, int count,
+ struct simd_aead_alg **simd_algs)
+{
+ int err;
+ int i;
+ const char *algname;
+ const char *drvname;
+ const char *basename;
+ struct simd_aead_alg *simd;
+
+ err = crypto_register_aeads(algs, count);
+ if (err)
+ return err;
+
+ for (i = 0; i < count; i++) {
+ WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
+ WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
+ algname = algs[i].base.cra_name + 2;
+ drvname = algs[i].base.cra_driver_name + 2;
+ basename = algs[i].base.cra_driver_name;
+ simd = simd_aead_create_compat(algname, drvname, basename);
+ err = PTR_ERR(simd);
+ if (IS_ERR(simd))
+ goto err_unregister;
+ simd_algs[i] = simd;
+ }
+ return 0;
+
+err_unregister:
+ simd_unregister_aeads(algs, count, simd_algs);
+ return err;
+}
+EXPORT_SYMBOL_GPL(simd_register_aeads_compat);
+
+void simd_unregister_aeads(struct aead_alg *algs, int count,
+ struct simd_aead_alg **simd_algs)
+{
+ int i;
+
+ crypto_unregister_aeads(algs, count);
+
+ for (i = 0; i < count; i++) {
+ if (simd_algs[i]) {
+ simd_aead_free(simd_algs[i]);
+ simd_algs[i] = NULL;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(simd_unregister_aeads);
+
MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / commitdiff