summaryrefslogtreecommitdiffstats
path: root/crypto/aegis256.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/aegis256.c')
-rw-r--r--crypto/aegis256.c473
1 files changed, 0 insertions, 473 deletions
diff --git a/crypto/aegis256.c b/crypto/aegis256.c
deleted file mode 100644
index b47fd39595ad..000000000000
--- a/crypto/aegis256.c
+++ /dev/null
@@ -1,473 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * The AEGIS-256 Authenticated-Encryption Algorithm
- *
- * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
- * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
- */
-
-#include <crypto/algapi.h>
-#include <crypto/internal/aead.h>
-#include <crypto/internal/skcipher.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 "aegis.h"
-
-#define AEGIS256_NONCE_SIZE 32
-#define AEGIS256_STATE_BLOCKS 6
-#define AEGIS256_KEY_SIZE 32
-#define AEGIS256_MIN_AUTH_SIZE 8
-#define AEGIS256_MAX_AUTH_SIZE 16
-
-struct aegis_state {
- union aegis_block blocks[AEGIS256_STATE_BLOCKS];
-};
-
-struct aegis_ctx {
- union aegis_block key[AEGIS256_KEY_SIZE / AEGIS_BLOCK_SIZE];
-};
-
-struct aegis256_ops {
- int (*skcipher_walk_init)(struct skcipher_walk *walk,
- struct aead_request *req, bool atomic);
-
- void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
- const u8 *src, unsigned int size);
-};
-
-static void crypto_aegis256_update(struct aegis_state *state)
-{
- union aegis_block tmp;
- unsigned int i;
-
- tmp = state->blocks[AEGIS256_STATE_BLOCKS - 1];
- for (i = AEGIS256_STATE_BLOCKS - 1; i > 0; i--)
- crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
- &state->blocks[i]);
- crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
-}
-
-static void crypto_aegis256_update_a(struct aegis_state *state,
- const union aegis_block *msg)
-{
- crypto_aegis256_update(state);
- crypto_aegis_block_xor(&state->blocks[0], msg);
-}
-
-static void crypto_aegis256_update_u(struct aegis_state *state, const void *msg)
-{
- crypto_aegis256_update(state);
- crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
-}
-
-static void crypto_aegis256_init(struct aegis_state *state,
- const union aegis_block *key,
- const u8 *iv)
-{
- union aegis_block key_iv[2];
- unsigned int i;
-
- key_iv[0] = key[0];
- key_iv[1] = key[1];
- crypto_xor(key_iv[0].bytes, iv + 0 * AEGIS_BLOCK_SIZE,
- AEGIS_BLOCK_SIZE);
- crypto_xor(key_iv[1].bytes, iv + 1 * AEGIS_BLOCK_SIZE,
- AEGIS_BLOCK_SIZE);
-
- state->blocks[0] = key_iv[0];
- state->blocks[1] = key_iv[1];
- state->blocks[2] = crypto_aegis_const[1];
- state->blocks[3] = crypto_aegis_const[0];
- state->blocks[4] = key[0];
- state->blocks[5] = key[1];
-
- crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[0]);
- crypto_aegis_block_xor(&state->blocks[5], &crypto_aegis_const[1]);
-
- for (i = 0; i < 4; i++) {
- crypto_aegis256_update_a(state, &key[0]);
- crypto_aegis256_update_a(state, &key[1]);
- crypto_aegis256_update_a(state, &key_iv[0]);
- crypto_aegis256_update_a(state, &key_iv[1]);
- }
-}
-
-static void crypto_aegis256_ad(struct aegis_state *state,
- const u8 *src, unsigned int size)
-{
- if (AEGIS_ALIGNED(src)) {
- const union aegis_block *src_blk =
- (const union aegis_block *)src;
-
- while (size >= AEGIS_BLOCK_SIZE) {
- crypto_aegis256_update_a(state, src_blk);
-
- size -= AEGIS_BLOCK_SIZE;
- src_blk++;
- }
- } else {
- while (size >= AEGIS_BLOCK_SIZE) {
- crypto_aegis256_update_u(state, src);
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- }
- }
-}
-
-static void crypto_aegis256_encrypt_chunk(struct aegis_state *state, u8 *dst,
- const u8 *src, unsigned int size)
-{
- union aegis_block tmp;
-
- if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
- while (size >= AEGIS_BLOCK_SIZE) {
- union aegis_block *dst_blk =
- (union aegis_block *)dst;
- const union aegis_block *src_blk =
- (const union aegis_block *)src;
-
- tmp = state->blocks[2];
- crypto_aegis_block_and(&tmp, &state->blocks[3]);
- crypto_aegis_block_xor(&tmp, &state->blocks[5]);
- crypto_aegis_block_xor(&tmp, &state->blocks[4]);
- crypto_aegis_block_xor(&tmp, &state->blocks[1]);
- crypto_aegis_block_xor(&tmp, src_blk);
-
- crypto_aegis256_update_a(state, src_blk);
-
- *dst_blk = tmp;
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- dst += AEGIS_BLOCK_SIZE;
- }
- } else {
- while (size >= AEGIS_BLOCK_SIZE) {
- tmp = state->blocks[2];
- crypto_aegis_block_and(&tmp, &state->blocks[3]);
- crypto_aegis_block_xor(&tmp, &state->blocks[5]);
- crypto_aegis_block_xor(&tmp, &state->blocks[4]);
- crypto_aegis_block_xor(&tmp, &state->blocks[1]);
- crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
-
- crypto_aegis256_update_u(state, src);
-
- memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- dst += AEGIS_BLOCK_SIZE;
- }
- }
-
- if (size > 0) {
- union aegis_block msg = {};
- memcpy(msg.bytes, src, size);
-
- tmp = state->blocks[2];
- crypto_aegis_block_and(&tmp, &state->blocks[3]);
- crypto_aegis_block_xor(&tmp, &state->blocks[5]);
- crypto_aegis_block_xor(&tmp, &state->blocks[4]);
- crypto_aegis_block_xor(&tmp, &state->blocks[1]);
-
- crypto_aegis256_update_a(state, &msg);
-
- crypto_aegis_block_xor(&msg, &tmp);
-
- memcpy(dst, msg.bytes, size);
- }
-}
-
-static void crypto_aegis256_decrypt_chunk(struct aegis_state *state, u8 *dst,
- const u8 *src, unsigned int size)
-{
- union aegis_block tmp;
-
- if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
- while (size >= AEGIS_BLOCK_SIZE) {
- union aegis_block *dst_blk =
- (union aegis_block *)dst;
- const union aegis_block *src_blk =
- (const union aegis_block *)src;
-
- tmp = state->blocks[2];
- crypto_aegis_block_and(&tmp, &state->blocks[3]);
- crypto_aegis_block_xor(&tmp, &state->blocks[5]);
- crypto_aegis_block_xor(&tmp, &state->blocks[4]);
- crypto_aegis_block_xor(&tmp, &state->blocks[1]);
- crypto_aegis_block_xor(&tmp, src_blk);
-
- crypto_aegis256_update_a(state, &tmp);
-
- *dst_blk = tmp;
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- dst += AEGIS_BLOCK_SIZE;
- }
- } else {
- while (size >= AEGIS_BLOCK_SIZE) {
- tmp = state->blocks[2];
- crypto_aegis_block_and(&tmp, &state->blocks[3]);
- crypto_aegis_block_xor(&tmp, &state->blocks[5]);
- crypto_aegis_block_xor(&tmp, &state->blocks[4]);
- crypto_aegis_block_xor(&tmp, &state->blocks[1]);
- crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
-
- crypto_aegis256_update_a(state, &tmp);
-
- memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- dst += AEGIS_BLOCK_SIZE;
- }
- }
-
- if (size > 0) {
- union aegis_block msg = {};
- memcpy(msg.bytes, src, size);
-
- tmp = state->blocks[2];
- crypto_aegis_block_and(&tmp, &state->blocks[3]);
- crypto_aegis_block_xor(&tmp, &state->blocks[5]);
- crypto_aegis_block_xor(&tmp, &state->blocks[4]);
- crypto_aegis_block_xor(&tmp, &state->blocks[1]);
- crypto_aegis_block_xor(&msg, &tmp);
-
- memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
-
- crypto_aegis256_update_a(state, &msg);
-
- memcpy(dst, msg.bytes, size);
- }
-}
-
-static void crypto_aegis256_process_ad(struct aegis_state *state,
- struct scatterlist *sg_src,
- unsigned int assoclen)
-{
- struct scatter_walk walk;
- union aegis_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 >= AEGIS_BLOCK_SIZE) {
- if (pos > 0) {
- unsigned int fill = AEGIS_BLOCK_SIZE - pos;
- memcpy(buf.bytes + pos, src, fill);
- crypto_aegis256_update_a(state, &buf);
- pos = 0;
- left -= fill;
- src += fill;
- }
-
- crypto_aegis256_ad(state, src, left);
- src += left & ~(AEGIS_BLOCK_SIZE - 1);
- left &= AEGIS_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, AEGIS_BLOCK_SIZE - pos);
- crypto_aegis256_update_a(state, &buf);
- }
-}
-
-static void crypto_aegis256_process_crypt(struct aegis_state *state,
- struct aead_request *req,
- const struct aegis256_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_aegis256_final(struct aegis_state *state,
- union aegis_block *tag_xor,
- u64 assoclen, u64 cryptlen)
-{
- u64 assocbits = assoclen * 8;
- u64 cryptbits = cryptlen * 8;
-
- union aegis_block tmp;
- unsigned int i;
-
- tmp.words64[0] = cpu_to_le64(assocbits);
- tmp.words64[1] = cpu_to_le64(cryptbits);
-
- crypto_aegis_block_xor(&tmp, &state->blocks[3]);
-
- for (i = 0; i < 7; i++)
- crypto_aegis256_update_a(state, &tmp);
-
- for (i = 0; i < AEGIS256_STATE_BLOCKS; i++)
- crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
-}
-
-static int crypto_aegis256_setkey(struct crypto_aead *aead, const u8 *key,
- unsigned int keylen)
-{
- struct aegis_ctx *ctx = crypto_aead_ctx(aead);
-
- if (keylen != AEGIS256_KEY_SIZE) {
- crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
-
- memcpy(ctx->key[0].bytes, key, AEGIS_BLOCK_SIZE);
- memcpy(ctx->key[1].bytes, key + AEGIS_BLOCK_SIZE,
- AEGIS_BLOCK_SIZE);
- return 0;
-}
-
-static int crypto_aegis256_setauthsize(struct crypto_aead *tfm,
- unsigned int authsize)
-{
- if (authsize > AEGIS256_MAX_AUTH_SIZE)
- return -EINVAL;
- if (authsize < AEGIS256_MIN_AUTH_SIZE)
- return -EINVAL;
- return 0;
-}
-
-static void crypto_aegis256_crypt(struct aead_request *req,
- union aegis_block *tag_xor,
- unsigned int cryptlen,
- const struct aegis256_ops *ops)
-{
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
- struct aegis_state state;
-
- crypto_aegis256_init(&state, ctx->key, req->iv);
- crypto_aegis256_process_ad(&state, req->src, req->assoclen);
- crypto_aegis256_process_crypt(&state, req, ops);
- crypto_aegis256_final(&state, tag_xor, req->assoclen, cryptlen);
-}
-
-static int crypto_aegis256_encrypt(struct aead_request *req)
-{
- static const struct aegis256_ops ops = {
- .skcipher_walk_init = skcipher_walk_aead_encrypt,
- .crypt_chunk = crypto_aegis256_encrypt_chunk,
- };
-
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- union aegis_block tag = {};
- unsigned int authsize = crypto_aead_authsize(tfm);
- unsigned int cryptlen = req->cryptlen;
-
- crypto_aegis256_crypt(req, &tag, cryptlen, &ops);
-
- scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
- authsize, 1);
- return 0;
-}
-
-static int crypto_aegis256_decrypt(struct aead_request *req)
-{
- static const struct aegis256_ops ops = {
- .skcipher_walk_init = skcipher_walk_aead_decrypt,
- .crypt_chunk = crypto_aegis256_decrypt_chunk,
- };
- static const u8 zeros[AEGIS256_MAX_AUTH_SIZE] = {};
-
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- union aegis_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_aegis256_crypt(req, &tag, cryptlen, &ops);
-
- return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
-}
-
-static int crypto_aegis256_init_tfm(struct crypto_aead *tfm)
-{
- return 0;
-}
-
-static void crypto_aegis256_exit_tfm(struct crypto_aead *tfm)
-{
-}
-
-static struct aead_alg crypto_aegis256_alg = {
- .setkey = crypto_aegis256_setkey,
- .setauthsize = crypto_aegis256_setauthsize,
- .encrypt = crypto_aegis256_encrypt,
- .decrypt = crypto_aegis256_decrypt,
- .init = crypto_aegis256_init_tfm,
- .exit = crypto_aegis256_exit_tfm,
-
- .ivsize = AEGIS256_NONCE_SIZE,
- .maxauthsize = AEGIS256_MAX_AUTH_SIZE,
- .chunksize = AEGIS_BLOCK_SIZE,
-
- .base = {
- .cra_blocksize = 1,
- .cra_ctxsize = sizeof(struct aegis_ctx),
- .cra_alignmask = 0,
-
- .cra_priority = 100,
-
- .cra_name = "aegis256",
- .cra_driver_name = "aegis256-generic",
-
- .cra_module = THIS_MODULE,
- }
-};
-
-static int __init crypto_aegis256_module_init(void)
-{
- return crypto_register_aead(&crypto_aegis256_alg);
-}
-
-static void __exit crypto_aegis256_module_exit(void)
-{
- crypto_unregister_aead(&crypto_aegis256_alg);
-}
-
-subsys_initcall(crypto_aegis256_module_init);
-module_exit(crypto_aegis256_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
-MODULE_DESCRIPTION("AEGIS-256 AEAD algorithm");
-MODULE_ALIAS_CRYPTO("aegis256");
-MODULE_ALIAS_CRYPTO("aegis256-generic");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 12:41:21 +0000