crypto: morus - Add generic MORUS AEAD implementations

This patch adds the generic implementation of the MORUS family of AEAD
algorithms (MORUS-640 and MORUS-1280). The original authors of MORUS
are Hongjun Wu and Tao Huang.

At the time of writing, MORUS is one of the finalists in CAESAR, an
open competition intended to select a portfolio of alternatives to
the problematic AES-GCM:

https://competitions.cr.yp.to/caesar-submissions.html
https://competitions.cr.yp.to/round3/morusv2.pdf

Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 549 insertions, 0 deletions

diff --git a/crypto/morus1280.c b/crypto/morus1280.c
new file mode 100644
index 000000000000..6180b2557836
--- /dev/null
+++ b/crypto/morus1280.c
@@ -0,0 +1,549 @@
+/*
+ * The MORUS-1280 Authenticated-Encryption Algorithm
+ *
+ * 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 <asm/unaligned.h>
+#include <crypto/algapi.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/morus_common.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>
+
+#define MORUS1280_WORD_SIZE 8
+#define MORUS1280_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS1280_WORD_SIZE)
+#define MORUS1280_BLOCK_ALIGN (__alignof__(__le64))
+#define MORUS1280_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS1280_BLOCK_ALIGN)
+
+struct morus1280_block {
+	u64 words[MORUS_BLOCK_WORDS];
+};
+
+union morus1280_block_in {
+	__le64 words[MORUS_BLOCK_WORDS];
+	u8 bytes[MORUS1280_BLOCK_SIZE];
+};
+
+struct morus1280_state {
+	struct morus1280_block s[MORUS_STATE_BLOCKS];
+};
+
+struct morus1280_ctx {
+	struct morus1280_block key;
+};
+
+struct morus1280_ops {
+	int (*skcipher_walk_init)(struct skcipher_walk *walk,
+				  struct aead_request *req, bool atomic);
+
+	void (*crypt_chunk)(struct morus1280_state *state,
+			    u8 *dst, const u8 *src, unsigned int size);
+};
+
+static const struct morus1280_block crypto_morus1280_const[1] = {
+	{ .words = {
+		U64_C(0x0d08050302010100),
+		U64_C(0x6279e99059372215),
+		U64_C(0xf12fc26d55183ddb),
+		U64_C(0xdd28b57342311120),
+	} },
+};
+
+static void crypto_morus1280_round(struct morus1280_block *b0,
+				   struct morus1280_block *b1,
+				   struct morus1280_block *b2,
+				   struct morus1280_block *b3,
+				   struct morus1280_block *b4,
+				   const struct morus1280_block *m,
+				   unsigned int b, unsigned int w)
+{
+	unsigned int i;
+	struct morus1280_block tmp;
+
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+		b0->words[i] ^= b1->words[i] & b2->words[i];
+		b0->words[i] ^= b3->words[i];
+		b0->words[i] ^= m->words[i];
+		b0->words[i] = rol64(b0->words[i], b);
+	}
+
+	tmp = *b3;
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+		b3->words[(i + w) % MORUS_BLOCK_WORDS] = tmp.words[i];
+}
+
+static void crypto_morus1280_update(struct morus1280_state *state,
+				    const struct morus1280_block *m)
+{
+	static const struct morus1280_block z = {};
+
+	struct morus1280_block *s = state->s;
+
+	crypto_morus1280_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 13, 1);
+	crypto_morus1280_round(&s[1], &s[2], &s[3], &s[4], &s[0], m,  46, 2);
+	crypto_morus1280_round(&s[2], &s[3], &s[4], &s[0], &s[1], m,  38, 3);
+	crypto_morus1280_round(&s[3], &s[4], &s[0], &s[1], &s[2], m,   7, 2);
+	crypto_morus1280_round(&s[4], &s[0], &s[1], &s[2], &s[3], m,   4, 1);
+}
+
+static void crypto_morus1280_load_a(struct morus1280_block *dst, const u8 *src)
+{
+	unsigned int i;
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+		dst->words[i] = le64_to_cpu(*(const __le64 *)src);
+		src += MORUS1280_WORD_SIZE;
+	}
+}
+
+static void crypto_morus1280_load_u(struct morus1280_block *dst, const u8 *src)
+{
+	unsigned int i;
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+		dst->words[i] = get_unaligned_le64(src);
+		src += MORUS1280_WORD_SIZE;
+	}
+}
+
+static void crypto_morus1280_load(struct morus1280_block *dst, const u8 *src)
+{
+	if (MORUS1280_ALIGNED(src))
+		crypto_morus1280_load_a(dst, src);
+	else
+		crypto_morus1280_load_u(dst, src);
+}
+
+static void crypto_morus1280_store_a(u8 *dst, const struct morus1280_block *src)
+{
+	unsigned int i;
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+		*(__le64 *)dst = cpu_to_le64(src->words[i]);
+		dst += MORUS1280_WORD_SIZE;
+	}
+}
+
+static void crypto_morus1280_store_u(u8 *dst, const struct morus1280_block *src)
+{
+	unsigned int i;
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+		put_unaligned_le64(src->words[i], dst);
+		dst += MORUS1280_WORD_SIZE;
+	}
+}
+
+static void crypto_morus1280_store(u8 *dst, const struct morus1280_block *src)
+{
+	if (MORUS1280_ALIGNED(dst))
+		crypto_morus1280_store_a(dst, src);
+	else
+		crypto_morus1280_store_u(dst, src);
+}
+
+static void crypto_morus1280_ad(struct morus1280_state *state, const u8 *src,
+				unsigned int size)
+{
+	struct morus1280_block m;
+
+	if (MORUS1280_ALIGNED(src)) {
+		while (size >= MORUS1280_BLOCK_SIZE) {
+			crypto_morus1280_load_a(&m, src);
+			crypto_morus1280_update(state, &m);
+
+			size -= MORUS1280_BLOCK_SIZE;
+			src += MORUS1280_BLOCK_SIZE;
+		}
+	} else {
+		while (size >= MORUS1280_BLOCK_SIZE) {
+			crypto_morus1280_load_u(&m, src);
+			crypto_morus1280_update(state, &m);
+
+			size -= MORUS1280_BLOCK_SIZE;
+			src += MORUS1280_BLOCK_SIZE;
+		}
+	}
+}
+
+static void crypto_morus1280_core(const struct morus1280_state *state,
+				  struct morus1280_block *blk)
+{
+	unsigned int i;
+
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+		blk->words[(i + 3) % MORUS_BLOCK_WORDS] ^= state->s[1].words[i];
+
+        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+		blk->words[i] ^= state->s[0].words[i];
+		blk->words[i] ^= state->s[2].words[i] & state->s[3].words[i];
+	}
+}
+
+static void crypto_morus1280_encrypt_chunk(struct morus1280_state *state,
+					   u8 *dst, const u8 *src,
+					   unsigned int size)
+{
+	struct morus1280_block c, m;
+
+	if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
+		while (size >= MORUS1280_BLOCK_SIZE) {
+			crypto_morus1280_load_a(&m, src);
+			c = m;
+			crypto_morus1280_core(state, &c);
+			crypto_morus1280_store_a(dst, &c);
+			crypto_morus1280_update(state, &m);
+
+			src += MORUS1280_BLOCK_SIZE;
+			dst += MORUS1280_BLOCK_SIZE;
+			size -= MORUS1280_BLOCK_SIZE;
+		}
+	} else {
+		while (size >= MORUS1280_BLOCK_SIZE) {
+			crypto_morus1280_load_u(&m, src);
+			c = m;
+			crypto_morus1280_core(state, &c);
+			crypto_morus1280_store_u(dst, &c);
+			crypto_morus1280_update(state, &m);
+
+			src += MORUS1280_BLOCK_SIZE;
+			dst += MORUS1280_BLOCK_SIZE;
+			size -= MORUS1280_BLOCK_SIZE;
+		}
+	}
+
+	if (size > 0) {
+		union morus1280_block_in tail;
+
+		memcpy(tail.bytes, src, size);
+		memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
+
+		crypto_morus1280_load_a(&m, tail.bytes);
+		c = m;
+		crypto_morus1280_core(state, &c);
+		crypto_morus1280_store_a(tail.bytes, &c);
+		crypto_morus1280_update(state, &m);
+
+		memcpy(dst, tail.bytes, size);
+	}
+}
+
+static void crypto_morus1280_decrypt_chunk(struct morus1280_state *state,
+					   u8 *dst, const u8 *src,
+					   unsigned int size)
+{
+	struct morus1280_block m;
+
+	if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
+		while (size >= MORUS1280_BLOCK_SIZE) {
+			crypto_morus1280_load_a(&m, src);
+			crypto_morus1280_core(state, &m);
+			crypto_morus1280_store_a(dst, &m);
+			crypto_morus1280_update(state, &m);
+
+			src += MORUS1280_BLOCK_SIZE;
+			dst += MORUS1280_BLOCK_SIZE;
+			size -= MORUS1280_BLOCK_SIZE;
+		}
+	} else {
+		while (size >= MORUS1280_BLOCK_SIZE) {
+			crypto_morus1280_load_u(&m, src);
+			crypto_morus1280_core(state, &m);
+			crypto_morus1280_store_u(dst, &m);
+			crypto_morus1280_update(state, &m);
+
+			src += MORUS1280_BLOCK_SIZE;
+			dst += MORUS1280_BLOCK_SIZE;
+			size -= MORUS1280_BLOCK_SIZE;
+		}
+	}
+
+	if (size > 0) {
+		union morus1280_block_in tail;
+
+		memcpy(tail.bytes, src, size);
+		memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
+
+		crypto_morus1280_load_a(&m, tail.bytes);
+		crypto_morus1280_core(state, &m);
+		crypto_morus1280_store_a(tail.bytes, &m);
+		memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
+		crypto_morus1280_load_a(&m, tail.bytes);
+		crypto_morus1280_update(state, &m);
+
+		memcpy(dst, tail.bytes, size);
+	}
+}
+
+static void crypto_morus1280_init(struct morus1280_state *state,
+				  const struct morus1280_block *key,
+				  const u8 *iv)
+{
+	static const struct morus1280_block z = {};
+
+	union morus1280_block_in tmp;
+	unsigned int i;
+
+	memcpy(tmp.bytes, iv, MORUS_NONCE_SIZE);
+	memset(tmp.bytes + MORUS_NONCE_SIZE, 0,
+	       MORUS1280_BLOCK_SIZE - MORUS_NONCE_SIZE);
+
+	crypto_morus1280_load(&state->s[0], tmp.bytes);
+	state->s[1] = *key;
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+		state->s[2].words[i] = U64_C(0xFFFFFFFFFFFFFFFF);
+	state->s[3] = z;
+	state->s[4] = crypto_morus1280_const[0];
+
+	for (i = 0; i < 16; i++)
+		crypto_morus1280_update(state, &z);
+
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+		state->s[1].words[i] ^= key->words[i];
+}
+
+static void crypto_morus1280_process_ad(struct morus1280_state *state,
+					struct scatterlist *sg_src,
+					unsigned int assoclen)
+{
+	struct scatter_walk walk;
+	struct morus1280_block m;
+	union morus1280_block_in 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 >= MORUS1280_BLOCK_SIZE) {
+			if (pos > 0) {
+				unsigned int fill = MORUS1280_BLOCK_SIZE - pos;
+				memcpy(buf.bytes + pos, src, fill);
+
+				crypto_morus1280_load_a(&m, buf.bytes);
+				crypto_morus1280_update(state, &m);
+
+				pos = 0;
+				left -= fill;
+				src += fill;
+			}
+
+			crypto_morus1280_ad(state, src, left);
+			src += left & ~(MORUS1280_BLOCK_SIZE - 1);
+			left &= MORUS1280_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, MORUS1280_BLOCK_SIZE - pos);
+
+		crypto_morus1280_load_a(&m, buf.bytes);
+		crypto_morus1280_update(state, &m);
+	}
+}
+
+static void crypto_morus1280_process_crypt(struct morus1280_state *state,
+					   struct aead_request *req,
+					   const struct morus1280_ops *ops)
+{
+	struct skcipher_walk walk;
+	u8 *dst;
+	const u8 *src;
+
+	ops->skcipher_walk_init(&walk, req, false);
+
+	while (walk.nbytes) {
+		src = walk.src.virt.addr;
+		dst = walk.dst.virt.addr;
+
+		ops->crypt_chunk(state, dst, src, walk.nbytes);
+
+		skcipher_walk_done(&walk, 0);
+	}
+}
+
+static void crypto_morus1280_final(struct morus1280_state *state,
+				   struct morus1280_block *tag_xor,
+				   u64 assoclen, u64 cryptlen)
+{
+	u64 assocbits = assoclen * 8;
+	u64 cryptbits = cryptlen * 8;
+
+	struct morus1280_block tmp;
+	unsigned int i;
+
+	tmp.words[0] = cpu_to_le64(assocbits);
+	tmp.words[1] = cpu_to_le64(cryptbits);
+	tmp.words[2] = 0;
+	tmp.words[3] = 0;
+
+	for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+		state->s[4].words[i] ^= state->s[0].words[i];
+
+	for (i = 0; i < 10; i++)
+		crypto_morus1280_update(state, &tmp);
+
+	crypto_morus1280_core(state, tag_xor);
+}
+
+static int crypto_morus1280_setkey(struct crypto_aead *aead, const u8 *key,
+				   unsigned int keylen)
+{
+	struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
+	union morus1280_block_in tmp;
+
+	if (keylen == MORUS1280_BLOCK_SIZE)
+		crypto_morus1280_load(&ctx->key, key);
+	else if (keylen == MORUS1280_BLOCK_SIZE / 2) {
+		memcpy(tmp.bytes, key, keylen);
+		memcpy(tmp.bytes + keylen, key, keylen);
+
+		crypto_morus1280_load(&ctx->key, tmp.bytes);
+	} else {
+		crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int crypto_morus1280_setauthsize(struct crypto_aead *tfm,
+					unsigned int authsize)
+{
+	return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
+}
+
+static void crypto_morus1280_crypt(struct aead_request *req,
+				   struct morus1280_block *tag_xor,
+				   unsigned int cryptlen,
+				   const struct morus1280_ops *ops)
+{
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
+	struct morus1280_state state;
+
+	crypto_morus1280_init(&state, &ctx->key, req->iv);
+	crypto_morus1280_process_ad(&state, req->src, req->assoclen);
+	crypto_morus1280_process_crypt(&state, req, ops);
+	crypto_morus1280_final(&state, tag_xor, req->assoclen, cryptlen);
+}
+
+static int crypto_morus1280_encrypt(struct aead_request *req)
+{
+	static const struct morus1280_ops ops = {
+		.skcipher_walk_init = skcipher_walk_aead_encrypt,
+		.crypt_chunk = crypto_morus1280_encrypt_chunk,
+	};
+
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	struct morus1280_block tag = {};
+	union morus1280_block_in tag_out;
+	unsigned int authsize = crypto_aead_authsize(tfm);
+	unsigned int cryptlen = req->cryptlen;
+
+	crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
+	crypto_morus1280_store(tag_out.bytes, &tag);
+
+	scatterwalk_map_and_copy(tag_out.bytes, req->dst,
+				 req->assoclen + cryptlen, authsize, 1);
+	return 0;
+}
+
+static int crypto_morus1280_decrypt(struct aead_request *req)
+{
+	static const struct morus1280_ops ops = {
+		.skcipher_walk_init = skcipher_walk_aead_decrypt,
+		.crypt_chunk = crypto_morus1280_decrypt_chunk,
+	};
+	static const u8 zeros[MORUS1280_BLOCK_SIZE] = {};
+
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	union morus1280_block_in tag_in;
+	struct morus1280_block tag;
+	unsigned int authsize = crypto_aead_authsize(tfm);
+	unsigned int cryptlen = req->cryptlen - authsize;
+
+	scatterwalk_map_and_copy(tag_in.bytes, req->src,
+				 req->assoclen + cryptlen, authsize, 0);
+
+	crypto_morus1280_load(&tag, tag_in.bytes);
+	crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
+	crypto_morus1280_store(tag_in.bytes, &tag);
+
+	return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
+}
+
+static int crypto_morus1280_init_tfm(struct crypto_aead *tfm)
+{
+	return 0;
+}
+
+static void crypto_morus1280_exit_tfm(struct crypto_aead *tfm)
+{
+}
+
+static struct aead_alg crypto_morus1280_alg = {
+	.setkey = crypto_morus1280_setkey,
+	.setauthsize = crypto_morus1280_setauthsize,
+	.encrypt = crypto_morus1280_encrypt,
+	.decrypt = crypto_morus1280_decrypt,
+	.init = crypto_morus1280_init_tfm,
+	.exit = crypto_morus1280_exit_tfm,
+
+	.ivsize = MORUS_NONCE_SIZE,
+	.maxauthsize = MORUS_MAX_AUTH_SIZE,
+	.chunksize = MORUS1280_BLOCK_SIZE,
+
+	.base = {
+		.cra_flags = CRYPTO_ALG_TYPE_AEAD,
+		.cra_blocksize = 1,
+		.cra_ctxsize = sizeof(struct morus1280_ctx),
+		.cra_alignmask = 0,
+
+		.cra_priority = 100,
+
+		.cra_name = "morus1280",
+		.cra_driver_name = "morus1280-generic",
+
+		.cra_module = THIS_MODULE,
+	}
+};
+
+
+static int __init crypto_morus1280_module_init(void)
+{
+	return crypto_register_aead(&crypto_morus1280_alg);
+}
+
+static void __exit crypto_morus1280_module_exit(void)
+{
+	crypto_unregister_aead(&crypto_morus1280_alg);
+}
+
+module_init(crypto_morus1280_module_init);
+module_exit(crypto_morus1280_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
+MODULE_DESCRIPTION("MORUS-1280 AEAD algorithm");
+MODULE_ALIAS_CRYPTO("morus1280");
+MODULE_ALIAS_CRYPTO("morus1280-generic");