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authorOndrej Mosnacek <omosnacek@gmail.com>2018-05-11 14:19:09 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2018-05-19 00:15:00 +0800
commit396be41f16fd05af6c914eeb2c96e0cc2dadf28c (patch)
treeda3d6b025a6e09b2d8e8c3142d8d88f4d9182fc6 /crypto/morus640.c
parent1d373d4e8e15b358f08de52956b32e0e38a11f84 (diff)
downloadlinux-stericsson-396be41f16fd05af6c914eeb2c96e0cc2dadf28c.tar.gz
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>
Diffstat (limited to 'crypto/morus640.c')
-rw-r--r--crypto/morus640.c544
1 files changed, 544 insertions, 0 deletions
diff --git a/crypto/morus640.c b/crypto/morus640.c
new file mode 100644
index 000000000000..9fbcde307daf
--- /dev/null
+++ b/crypto/morus640.c
@@ -0,0 +1,544 @@
+/*
+ * The MORUS-640 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 MORUS640_WORD_SIZE 4
+#define MORUS640_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS640_WORD_SIZE)
+#define MORUS640_BLOCK_ALIGN (__alignof__(__le32))
+#define MORUS640_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS640_BLOCK_ALIGN)
+
+struct morus640_block {
+ u32 words[MORUS_BLOCK_WORDS];
+};
+
+union morus640_block_in {
+ __le32 words[MORUS_BLOCK_WORDS];
+ u8 bytes[MORUS640_BLOCK_SIZE];
+};
+
+struct morus640_state {
+ struct morus640_block s[MORUS_STATE_BLOCKS];
+};
+
+struct morus640_ctx {
+ struct morus640_block key;
+};
+
+struct morus640_ops {
+ int (*skcipher_walk_init)(struct skcipher_walk *walk,
+ struct aead_request *req, bool atomic);
+
+ void (*crypt_chunk)(struct morus640_state *state,
+ u8 *dst, const u8 *src, unsigned int size);
+};
+
+static const struct morus640_block crypto_morus640_const[2] = {
+ { .words = {
+ U32_C(0x02010100),
+ U32_C(0x0d080503),
+ U32_C(0x59372215),
+ U32_C(0x6279e990),
+ } },
+ { .words = {
+ U32_C(0x55183ddb),
+ U32_C(0xf12fc26d),
+ U32_C(0x42311120),
+ U32_C(0xdd28b573),
+ } },
+};
+
+static void crypto_morus640_round(struct morus640_block *b0,
+ struct morus640_block *b1,
+ struct morus640_block *b2,
+ struct morus640_block *b3,
+ struct morus640_block *b4,
+ const struct morus640_block *m,
+ unsigned int b, unsigned int w)
+{
+ unsigned int i;
+ struct morus640_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] = rol32(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_morus640_update(struct morus640_state *state,
+ const struct morus640_block *m)
+{
+ static const struct morus640_block z = {};
+
+ struct morus640_block *s = state->s;
+
+ crypto_morus640_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 5, 1);
+ crypto_morus640_round(&s[1], &s[2], &s[3], &s[4], &s[0], m, 31, 2);
+ crypto_morus640_round(&s[2], &s[3], &s[4], &s[0], &s[1], m, 7, 3);
+ crypto_morus640_round(&s[3], &s[4], &s[0], &s[1], &s[2], m, 22, 2);
+ crypto_morus640_round(&s[4], &s[0], &s[1], &s[2], &s[3], m, 13, 1);
+}
+
+static void crypto_morus640_load_a(struct morus640_block *dst, const u8 *src)
+{
+ unsigned int i;
+ for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+ dst->words[i] = le32_to_cpu(*(const __le32 *)src);
+ src += MORUS640_WORD_SIZE;
+ }
+}
+
+static void crypto_morus640_load_u(struct morus640_block *dst, const u8 *src)
+{
+ unsigned int i;
+ for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+ dst->words[i] = get_unaligned_le32(src);
+ src += MORUS640_WORD_SIZE;
+ }
+}
+
+static void crypto_morus640_load(struct morus640_block *dst, const u8 *src)
+{
+ if (MORUS640_ALIGNED(src))
+ crypto_morus640_load_a(dst, src);
+ else
+ crypto_morus640_load_u(dst, src);
+}
+
+static void crypto_morus640_store_a(u8 *dst, const struct morus640_block *src)
+{
+ unsigned int i;
+ for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+ *(__le32 *)dst = cpu_to_le32(src->words[i]);
+ dst += MORUS640_WORD_SIZE;
+ }
+}
+
+static void crypto_morus640_store_u(u8 *dst, const struct morus640_block *src)
+{
+ unsigned int i;
+ for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
+ put_unaligned_le32(src->words[i], dst);
+ dst += MORUS640_WORD_SIZE;
+ }
+}
+
+static void crypto_morus640_store(u8 *dst, const struct morus640_block *src)
+{
+ if (MORUS640_ALIGNED(dst))
+ crypto_morus640_store_a(dst, src);
+ else
+ crypto_morus640_store_u(dst, src);
+}
+
+static void crypto_morus640_ad(struct morus640_state *state, const u8 *src,
+ unsigned int size)
+{
+ struct morus640_block m;
+
+ if (MORUS640_ALIGNED(src)) {
+ while (size >= MORUS640_BLOCK_SIZE) {
+ crypto_morus640_load_a(&m, src);
+ crypto_morus640_update(state, &m);
+
+ size -= MORUS640_BLOCK_SIZE;
+ src += MORUS640_BLOCK_SIZE;
+ }
+ } else {
+ while (size >= MORUS640_BLOCK_SIZE) {
+ crypto_morus640_load_u(&m, src);
+ crypto_morus640_update(state, &m);
+
+ size -= MORUS640_BLOCK_SIZE;
+ src += MORUS640_BLOCK_SIZE;
+ }
+ }
+}
+
+static void crypto_morus640_core(const struct morus640_state *state,
+ struct morus640_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_morus640_encrypt_chunk(struct morus640_state *state, u8 *dst,
+ const u8 *src, unsigned int size)
+{
+ struct morus640_block c, m;
+
+ if (MORUS640_ALIGNED(src) && MORUS640_ALIGNED(dst)) {
+ while (size >= MORUS640_BLOCK_SIZE) {
+ crypto_morus640_load_a(&m, src);
+ c = m;
+ crypto_morus640_core(state, &c);
+ crypto_morus640_store_a(dst, &c);
+ crypto_morus640_update(state, &m);
+
+ src += MORUS640_BLOCK_SIZE;
+ dst += MORUS640_BLOCK_SIZE;
+ size -= MORUS640_BLOCK_SIZE;
+ }
+ } else {
+ while (size >= MORUS640_BLOCK_SIZE) {
+ crypto_morus640_load_u(&m, src);
+ c = m;
+ crypto_morus640_core(state, &c);
+ crypto_morus640_store_u(dst, &c);
+ crypto_morus640_update(state, &m);
+
+ src += MORUS640_BLOCK_SIZE;
+ dst += MORUS640_BLOCK_SIZE;
+ size -= MORUS640_BLOCK_SIZE;
+ }
+ }
+
+ if (size > 0) {
+ union morus640_block_in tail;
+
+ memcpy(tail.bytes, src, size);
+ memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size);
+
+ crypto_morus640_load_a(&m, tail.bytes);
+ c = m;
+ crypto_morus640_core(state, &c);
+ crypto_morus640_store_a(tail.bytes, &c);
+ crypto_morus640_update(state, &m);
+
+ memcpy(dst, tail.bytes, size);
+ }
+}
+
+static void crypto_morus640_decrypt_chunk(struct morus640_state *state, u8 *dst,
+ const u8 *src, unsigned int size)
+{
+ struct morus640_block m;
+
+ if (MORUS640_ALIGNED(src) && MORUS640_ALIGNED(dst)) {
+ while (size >= MORUS640_BLOCK_SIZE) {
+ crypto_morus640_load_a(&m, src);
+ crypto_morus640_core(state, &m);
+ crypto_morus640_store_a(dst, &m);
+ crypto_morus640_update(state, &m);
+
+ src += MORUS640_BLOCK_SIZE;
+ dst += MORUS640_BLOCK_SIZE;
+ size -= MORUS640_BLOCK_SIZE;
+ }
+ } else {
+ while (size >= MORUS640_BLOCK_SIZE) {
+ crypto_morus640_load_u(&m, src);
+ crypto_morus640_core(state, &m);
+ crypto_morus640_store_u(dst, &m);
+ crypto_morus640_update(state, &m);
+
+ src += MORUS640_BLOCK_SIZE;
+ dst += MORUS640_BLOCK_SIZE;
+ size -= MORUS640_BLOCK_SIZE;
+ }
+ }
+
+ if (size > 0) {
+ union morus640_block_in tail;
+
+ memcpy(tail.bytes, src, size);
+
+ crypto_morus640_load_a(&m, src);
+ crypto_morus640_core(state, &m);
+ crypto_morus640_store_a(tail.bytes, &m);
+ memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size);
+ crypto_morus640_load_a(&m, tail.bytes);
+ crypto_morus640_update(state, &m);
+
+ memcpy(dst, tail.bytes, size);
+ }
+}
+
+static void crypto_morus640_init(struct morus640_state *state,
+ const struct morus640_block *key,
+ const u8 *iv)
+{
+ static const struct morus640_block z = {};
+
+ unsigned int i;
+
+ crypto_morus640_load(&state->s[0], iv);
+ state->s[1] = *key;
+ for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+ state->s[2].words[i] = U32_C(0xFFFFFFFF);
+ state->s[3] = crypto_morus640_const[0];
+ state->s[4] = crypto_morus640_const[1];
+
+ for (i = 0; i < 16; i++)
+ crypto_morus640_update(state, &z);
+
+ for (i = 0; i < MORUS_BLOCK_WORDS; i++)
+ state->s[1].words[i] ^= key->words[i];
+}
+
+static void crypto_morus640_process_ad(struct morus640_state *state,
+ struct scatterlist *sg_src,
+ unsigned int assoclen)
+{
+ struct scatter_walk walk;
+ struct morus640_block m;
+ union morus640_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 >= MORUS640_BLOCK_SIZE) {
+ if (pos > 0) {
+ unsigned int fill = MORUS640_BLOCK_SIZE - pos;
+ memcpy(buf.bytes + pos, src, fill);
+
+ crypto_morus640_load_a(&m, buf.bytes);
+ crypto_morus640_update(state, &m);
+
+ pos = 0;
+ left -= fill;
+ src += fill;
+ }
+
+ crypto_morus640_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);
+
+ crypto_morus640_load_a(&m, buf.bytes);
+ crypto_morus640_update(state, &m);
+ }
+}
+
+static void crypto_morus640_process_crypt(struct morus640_state *state,
+ struct aead_request *req,
+ const struct morus640_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_morus640_final(struct morus640_state *state,
+ struct morus640_block *tag_xor,
+ u64 assoclen, u64 cryptlen)
+{
+ u64 assocbits = assoclen * 8;
+ u64 cryptbits = cryptlen * 8;
+
+ u32 assocbits_lo = (u32)assocbits;
+ u32 assocbits_hi = (u32)(assocbits >> 32);
+ u32 cryptbits_lo = (u32)cryptbits;
+ u32 cryptbits_hi = (u32)(cryptbits >> 32);
+
+ struct morus640_block tmp;
+ unsigned int i;
+
+ tmp.words[0] = cpu_to_le32(assocbits_lo);
+ tmp.words[1] = cpu_to_le32(assocbits_hi);
+ tmp.words[2] = cpu_to_le32(cryptbits_lo);
+ tmp.words[3] = cpu_to_le32(cryptbits_hi);
+
+ 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_morus640_update(state, &tmp);
+
+ crypto_morus640_core(state, tag_xor);
+}
+
+static int crypto_morus640_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;
+ }
+
+ crypto_morus640_load(&ctx->key, key);
+ return 0;
+}
+
+static int crypto_morus640_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
+}
+
+static void crypto_morus640_crypt(struct aead_request *req,
+ struct morus640_block *tag_xor,
+ unsigned int cryptlen,
+ const struct morus640_ops *ops)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
+ struct morus640_state state;
+
+ crypto_morus640_init(&state, &ctx->key, req->iv);
+ crypto_morus640_process_ad(&state, req->src, req->assoclen);
+ crypto_morus640_process_crypt(&state, req, ops);
+ crypto_morus640_final(&state, tag_xor, req->assoclen, cryptlen);
+}
+
+static int crypto_morus640_encrypt(struct aead_request *req)
+{
+ static const struct morus640_ops ops = {
+ .skcipher_walk_init = skcipher_walk_aead_encrypt,
+ .crypt_chunk = crypto_morus640_encrypt_chunk,
+ };
+
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct morus640_block tag = {};
+ union morus640_block_in tag_out;
+ unsigned int authsize = crypto_aead_authsize(tfm);
+ unsigned int cryptlen = req->cryptlen;
+
+ crypto_morus640_crypt(req, &tag, cryptlen, &ops);
+ crypto_morus640_store(tag_out.bytes, &tag);
+
+ scatterwalk_map_and_copy(tag_out.bytes, req->dst,
+ req->assoclen + cryptlen, authsize, 1);
+ return 0;
+}
+
+static int crypto_morus640_decrypt(struct aead_request *req)
+{
+ static const struct morus640_ops ops = {
+ .skcipher_walk_init = skcipher_walk_aead_decrypt,
+ .crypt_chunk = crypto_morus640_decrypt_chunk,
+ };
+ static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
+
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ union morus640_block_in tag_in;
+ struct morus640_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_morus640_load(&tag, tag_in.bytes);
+ crypto_morus640_crypt(req, &tag, cryptlen, &ops);
+ crypto_morus640_store(tag_in.bytes, &tag);
+
+ return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
+}
+
+static int crypto_morus640_init_tfm(struct crypto_aead *tfm)
+{
+ return 0;
+}
+
+static void crypto_morus640_exit_tfm(struct crypto_aead *tfm)
+{
+}
+
+static struct aead_alg crypto_morus640_alg = {
+ .setkey = crypto_morus640_setkey,
+ .setauthsize = crypto_morus640_setauthsize,
+ .encrypt = crypto_morus640_encrypt,
+ .decrypt = crypto_morus640_decrypt,
+ .init = crypto_morus640_init_tfm,
+ .exit = crypto_morus640_exit_tfm,
+
+ .ivsize = MORUS_NONCE_SIZE,
+ .maxauthsize = MORUS_MAX_AUTH_SIZE,
+ .chunksize = MORUS640_BLOCK_SIZE,
+
+ .base = {
+ .cra_flags = CRYPTO_ALG_TYPE_AEAD,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct morus640_ctx),
+ .cra_alignmask = 0,
+
+ .cra_priority = 100,
+
+ .cra_name = "morus640",
+ .cra_driver_name = "morus640-generic",
+
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static int __init crypto_morus640_module_init(void)
+{
+ return crypto_register_aead(&crypto_morus640_alg);
+}
+
+static void __exit crypto_morus640_module_exit(void)
+{
+ crypto_unregister_aead(&crypto_morus640_alg);
+}
+
+module_init(crypto_morus640_module_init);
+module_exit(crypto_morus640_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
+MODULE_DESCRIPTION("MORUS-640 AEAD algorithm");
+MODULE_ALIAS_CRYPTO("morus640");
+MODULE_ALIAS_CRYPTO("morus640-generic");