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-rw-r--r--crypto/morus640_glue.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/crypto/morus640_glue.c b/crypto/morus640_glue.c
new file mode 100644
index 000000000000..c7e788cfaa29
--- /dev/null
+++ b/crypto/morus640_glue.c
@@ -0,0 +1,298 @@
+/*
+ * The MORUS-640 Authenticated-Encryption Algorithm
+ * Common glue skeleton
+ *
+ * Copyright (c) 2016-2018 Ondrej Mosnacek <omosnacek@gmail.com>
+ * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
+ *
+ * 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/cryptd.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/morus640_glue.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <asm/fpu/api.h>
+
+struct morus640_state {
+ struct morus640_block s[MORUS_STATE_BLOCKS];
+};
+
+struct morus640_ops {
+ int (*skcipher_walk_init)(struct skcipher_walk *walk,
+ struct aead_request *req, bool atomic);
+
+ void (*crypt_blocks)(void *state, const void *src, void *dst,
+ unsigned int length);
+ void (*crypt_tail)(void *state, const void *src, void *dst,
+ unsigned int length);
+};
+
+static void crypto_morus640_glue_process_ad(
+ struct morus640_state *state,
+ const struct morus640_glue_ops *ops,
+ struct scatterlist *sg_src, unsigned int assoclen)
+{
+ struct scatter_walk walk;
+ struct morus640_block buf;
+ unsigned int pos = 0;
+
+ scatterwalk_start(&walk, sg_src);
+ while (assoclen != 0) {
+ unsigned int size = scatterwalk_clamp(&walk, assoclen);
+ unsigned int left = size;
+ void *mapped = scatterwalk_map(&walk);
+ const u8 *src = (const u8 *)mapped;
+
+ if (pos + size >= MORUS640_BLOCK_SIZE) {
+ if (pos > 0) {
+ unsigned int fill = MORUS640_BLOCK_SIZE - pos;
+ memcpy(buf.bytes + pos, src, fill);
+ ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
+ pos = 0;
+ left -= fill;
+ src += fill;
+ }
+
+ ops->ad(state, src, left);
+ src += left & ~(MORUS640_BLOCK_SIZE - 1);
+ left &= MORUS640_BLOCK_SIZE - 1;
+ }
+
+ memcpy(buf.bytes + pos, src, left);
+
+ pos += left;
+ assoclen -= size;
+ scatterwalk_unmap(mapped);
+ scatterwalk_advance(&walk, size);
+ scatterwalk_done(&walk, 0, assoclen);
+ }
+
+ if (pos > 0) {
+ memset(buf.bytes + pos, 0, MORUS640_BLOCK_SIZE - pos);
+ ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
+ }
+}
+
+static void crypto_morus640_glue_process_crypt(struct morus640_state *state,
+ struct morus640_ops ops,
+ struct aead_request *req)
+{
+ struct skcipher_walk walk;
+ u8 *cursor_src, *cursor_dst;
+ unsigned int chunksize, base;
+
+ ops.skcipher_walk_init(&walk, req, false);
+
+ while (walk.nbytes) {
+ cursor_src = walk.src.virt.addr;
+ cursor_dst = walk.dst.virt.addr;
+ chunksize = walk.nbytes;
+
+ ops.crypt_blocks(state, cursor_src, cursor_dst, chunksize);
+
+ base = chunksize & ~(MORUS640_BLOCK_SIZE - 1);
+ cursor_src += base;
+ cursor_dst += base;
+ chunksize &= MORUS640_BLOCK_SIZE - 1;
+
+ if (chunksize > 0)
+ ops.crypt_tail(state, cursor_src, cursor_dst,
+ chunksize);
+
+ skcipher_walk_done(&walk, 0);
+ }
+}
+
+int crypto_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
+ unsigned int keylen)
+{
+ struct morus640_ctx *ctx = crypto_aead_ctx(aead);
+
+ if (keylen != MORUS640_BLOCK_SIZE) {
+ crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ memcpy(ctx->key.bytes, key, MORUS640_BLOCK_SIZE);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_morus640_glue_setkey);
+
+int crypto_morus640_glue_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
+}
+EXPORT_SYMBOL_GPL(crypto_morus640_glue_setauthsize);
+
+static void crypto_morus640_glue_crypt(struct aead_request *req,
+ struct morus640_ops ops,
+ unsigned int cryptlen,
+ struct morus640_block *tag_xor)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
+ struct morus640_state state;
+
+ kernel_fpu_begin();
+
+ ctx->ops->init(&state, &ctx->key, req->iv);
+ crypto_morus640_glue_process_ad(&state, ctx->ops, req->src, req->assoclen);
+ crypto_morus640_glue_process_crypt(&state, ops, req);
+ ctx->ops->final(&state, tag_xor, req->assoclen, cryptlen);
+
+ kernel_fpu_end();
+}
+
+int crypto_morus640_glue_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
+ struct morus640_ops OPS = {
+ .skcipher_walk_init = skcipher_walk_aead_encrypt,
+ .crypt_blocks = ctx->ops->enc,
+ .crypt_tail = ctx->ops->enc_tail,
+ };
+
+ struct morus640_block tag = {};
+ unsigned int authsize = crypto_aead_authsize(tfm);
+ unsigned int cryptlen = req->cryptlen;
+
+ crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
+
+ scatterwalk_map_and_copy(tag.bytes, req->dst,
+ req->assoclen + cryptlen, authsize, 1);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_morus640_glue_encrypt);
+
+int crypto_morus640_glue_decrypt(struct aead_request *req)
+{
+ static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
+
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
+ struct morus640_ops OPS = {
+ .skcipher_walk_init = skcipher_walk_aead_decrypt,
+ .crypt_blocks = ctx->ops->dec,
+ .crypt_tail = ctx->ops->dec_tail,
+ };
+
+ struct morus640_block tag;
+ unsigned int authsize = crypto_aead_authsize(tfm);
+ unsigned int cryptlen = req->cryptlen - authsize;
+
+ scatterwalk_map_and_copy(tag.bytes, req->src,
+ req->assoclen + cryptlen, authsize, 0);
+
+ crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
+
+ return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
+}
+EXPORT_SYMBOL_GPL(crypto_morus640_glue_decrypt);
+
+void crypto_morus640_glue_init_ops(struct crypto_aead *aead,
+ const struct morus640_glue_ops *ops)
+{
+ struct morus640_ctx *ctx = crypto_aead_ctx(aead);
+ ctx->ops = ops;
+}
+EXPORT_SYMBOL_GPL(crypto_morus640_glue_init_ops);
+
+int cryptd_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
+ unsigned int keylen)
+{
+ struct cryptd_aead **ctx = crypto_aead_ctx(aead);
+ struct cryptd_aead *cryptd_tfm = *ctx;
+
+ return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
+}
+EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setkey);
+
+int cryptd_morus640_glue_setauthsize(struct crypto_aead *aead,
+ unsigned int authsize)
+{
+ struct cryptd_aead **ctx = crypto_aead_ctx(aead);
+ struct cryptd_aead *cryptd_tfm = *ctx;
+
+ return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
+}
+EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setauthsize);
+
+int cryptd_morus640_glue_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct cryptd_aead **ctx = crypto_aead_ctx(aead);
+ struct cryptd_aead *cryptd_tfm = *ctx;
+
+ aead = &cryptd_tfm->base;
+ if (irq_fpu_usable() && (!in_atomic() ||
+ !cryptd_aead_queued(cryptd_tfm)))
+ aead = cryptd_aead_child(cryptd_tfm);
+
+ aead_request_set_tfm(req, aead);
+
+ return crypto_aead_encrypt(req);
+}
+EXPORT_SYMBOL_GPL(cryptd_morus640_glue_encrypt);
+
+int cryptd_morus640_glue_decrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct cryptd_aead **ctx = crypto_aead_ctx(aead);
+ struct cryptd_aead *cryptd_tfm = *ctx;
+
+ aead = &cryptd_tfm->base;
+ if (irq_fpu_usable() && (!in_atomic() ||
+ !cryptd_aead_queued(cryptd_tfm)))
+ aead = cryptd_aead_child(cryptd_tfm);
+
+ aead_request_set_tfm(req, aead);
+
+ return crypto_aead_decrypt(req);
+}
+EXPORT_SYMBOL_GPL(cryptd_morus640_glue_decrypt);
+
+int cryptd_morus640_glue_init_tfm(struct crypto_aead *aead)
+{
+ struct cryptd_aead *cryptd_tfm;
+ struct cryptd_aead **ctx = crypto_aead_ctx(aead);
+ const char *name = crypto_aead_alg(aead)->base.cra_driver_name;
+ char internal_name[CRYPTO_MAX_ALG_NAME];
+
+ if (snprintf(internal_name, CRYPTO_MAX_ALG_NAME, "__%s", name)
+ >= CRYPTO_MAX_ALG_NAME)
+ return -ENAMETOOLONG;
+
+ cryptd_tfm = cryptd_alloc_aead(internal_name, CRYPTO_ALG_INTERNAL,
+ CRYPTO_ALG_INTERNAL);
+ if (IS_ERR(cryptd_tfm))
+ return PTR_ERR(cryptd_tfm);
+
+ *ctx = cryptd_tfm;
+ crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cryptd_morus640_glue_init_tfm);
+
+void cryptd_morus640_glue_exit_tfm(struct crypto_aead *aead)
+{
+ struct cryptd_aead **ctx = crypto_aead_ctx(aead);
+
+ cryptd_free_aead(*ctx);
+}
+EXPORT_SYMBOL_GPL(cryptd_morus640_glue_exit_tfm);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
+MODULE_DESCRIPTION("MORUS-640 AEAD mode -- glue for optimizations");