crypto: morus - remove generic and x86 implementations

MORUS was not selected as a winner in the CAESAR competition, which
is not surprising since it is considered to be cryptographically
broken [0]. (Note that this is not an implementation defect, but a
flaw in the underlying algorithm). Since it is unlikely to be in use
currently, let's remove it before we're stuck with it.

[0] https://eprint.iacr.org/2019/172.pdf

Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 542 deletions

diff --git a/crypto/morus1280.c b/crypto/morus1280.c
deleted file mode 100644
index f8734c6576af..000000000000
--- a/crypto/morus1280.c
+++ /dev/null
@@ -1,542 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * 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.
- */
-
-#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;
-
-	ops->skcipher_walk_init(&walk, req, false);
-
-	while (walk.nbytes) {
-		unsigned int nbytes = walk.nbytes;
-
-		if (nbytes < walk.total)
-			nbytes = round_down(nbytes, walk.stride);
-
-		ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
-				 nbytes);
-
-		skcipher_walk_done(&walk, walk.nbytes - nbytes);
-	}
-}
-
-static void crypto_morus1280_final(struct morus1280_state *state,
-				   struct morus1280_block *tag_xor,
-				   u64 assoclen, u64 cryptlen)
-{
-	struct morus1280_block tmp;
-	unsigned int i;
-
-	tmp.words[0] = assoclen * 8;
-	tmp.words[1] = cryptlen * 8;
-	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_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);
-}
-
-subsys_initcall(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");