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596 lines
16 KiB
596 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* The AEGIS-128 Authenticated-Encryption Algorithm |
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* |
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* Copyright (c) 2017-2018 Ondrej Mosnacek <[email protected]> |
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* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved. |
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*/ |
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|
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#include <crypto/algapi.h> |
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#include <crypto/internal/aead.h> |
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#include <crypto/internal/simd.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/jump_label.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/scatterlist.h> |
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#include <asm/simd.h> |
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#include "aegis.h" |
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#define AEGIS128_NONCE_SIZE 16 |
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#define AEGIS128_STATE_BLOCKS 5 |
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#define AEGIS128_KEY_SIZE 16 |
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#define AEGIS128_MIN_AUTH_SIZE 8 |
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#define AEGIS128_MAX_AUTH_SIZE 16 |
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struct aegis_state { |
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union aegis_block blocks[AEGIS128_STATE_BLOCKS]; |
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}; |
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struct aegis_ctx { |
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union aegis_block key; |
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}; |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd); |
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static const union aegis_block crypto_aegis_const[2] = { |
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{ .words64 = { |
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cpu_to_le64(U64_C(0x0d08050302010100)), |
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cpu_to_le64(U64_C(0x6279e99059372215)), |
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} }, |
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{ .words64 = { |
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cpu_to_le64(U64_C(0xf12fc26d55183ddb)), |
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cpu_to_le64(U64_C(0xdd28b57342311120)), |
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} }, |
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}; |
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static bool aegis128_do_simd(void) |
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{ |
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#ifdef CONFIG_CRYPTO_AEGIS128_SIMD |
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if (static_branch_likely(&have_simd)) |
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return crypto_simd_usable(); |
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#endif |
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return false; |
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} |
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bool crypto_aegis128_have_simd(void); |
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void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg); |
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void crypto_aegis128_init_simd(struct aegis_state *state, |
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const union aegis_block *key, |
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const u8 *iv); |
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void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst, |
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const u8 *src, unsigned int size); |
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void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst, |
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const u8 *src, unsigned int size); |
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int crypto_aegis128_final_simd(struct aegis_state *state, |
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union aegis_block *tag_xor, |
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unsigned int assoclen, |
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unsigned int cryptlen, |
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unsigned int authsize); |
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static void crypto_aegis128_update(struct aegis_state *state) |
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{ |
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union aegis_block tmp; |
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unsigned int i; |
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tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1]; |
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for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--) |
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crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1], |
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&state->blocks[i]); |
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crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]); |
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} |
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static void crypto_aegis128_update_a(struct aegis_state *state, |
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const union aegis_block *msg, |
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bool do_simd) |
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{ |
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if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) { |
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crypto_aegis128_update_simd(state, msg); |
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return; |
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} |
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crypto_aegis128_update(state); |
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crypto_aegis_block_xor(&state->blocks[0], msg); |
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} |
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static void crypto_aegis128_update_u(struct aegis_state *state, const void *msg, |
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bool do_simd) |
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{ |
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if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) { |
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crypto_aegis128_update_simd(state, msg); |
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return; |
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} |
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crypto_aegis128_update(state); |
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crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE); |
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} |
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static void crypto_aegis128_init(struct aegis_state *state, |
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const union aegis_block *key, |
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const u8 *iv) |
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{ |
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union aegis_block key_iv; |
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unsigned int i; |
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key_iv = *key; |
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crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE); |
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state->blocks[0] = key_iv; |
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state->blocks[1] = crypto_aegis_const[1]; |
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state->blocks[2] = crypto_aegis_const[0]; |
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state->blocks[3] = *key; |
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state->blocks[4] = *key; |
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crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]); |
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crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]); |
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for (i = 0; i < 5; i++) { |
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crypto_aegis128_update_a(state, key, false); |
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crypto_aegis128_update_a(state, &key_iv, false); |
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} |
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} |
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static void crypto_aegis128_ad(struct aegis_state *state, |
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const u8 *src, unsigned int size, |
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bool do_simd) |
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{ |
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if (AEGIS_ALIGNED(src)) { |
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const union aegis_block *src_blk = |
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(const union aegis_block *)src; |
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while (size >= AEGIS_BLOCK_SIZE) { |
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crypto_aegis128_update_a(state, src_blk, do_simd); |
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size -= AEGIS_BLOCK_SIZE; |
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src_blk++; |
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} |
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} else { |
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while (size >= AEGIS_BLOCK_SIZE) { |
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crypto_aegis128_update_u(state, src, do_simd); |
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size -= AEGIS_BLOCK_SIZE; |
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src += AEGIS_BLOCK_SIZE; |
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} |
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} |
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} |
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static void crypto_aegis128_wipe_chunk(struct aegis_state *state, u8 *dst, |
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const u8 *src, unsigned int size) |
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{ |
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memzero_explicit(dst, size); |
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} |
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static void crypto_aegis128_encrypt_chunk(struct aegis_state *state, u8 *dst, |
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const u8 *src, unsigned int size) |
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{ |
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union aegis_block tmp; |
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if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) { |
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while (size >= AEGIS_BLOCK_SIZE) { |
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union aegis_block *dst_blk = |
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(union aegis_block *)dst; |
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const union aegis_block *src_blk = |
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(const union aegis_block *)src; |
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tmp = state->blocks[2]; |
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crypto_aegis_block_and(&tmp, &state->blocks[3]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[4]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[1]); |
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crypto_aegis_block_xor(&tmp, src_blk); |
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crypto_aegis128_update_a(state, src_blk, false); |
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*dst_blk = tmp; |
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size -= AEGIS_BLOCK_SIZE; |
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src += AEGIS_BLOCK_SIZE; |
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dst += AEGIS_BLOCK_SIZE; |
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} |
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} else { |
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while (size >= AEGIS_BLOCK_SIZE) { |
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tmp = state->blocks[2]; |
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crypto_aegis_block_and(&tmp, &state->blocks[3]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[4]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[1]); |
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crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE); |
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crypto_aegis128_update_u(state, src, false); |
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memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE); |
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size -= AEGIS_BLOCK_SIZE; |
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src += AEGIS_BLOCK_SIZE; |
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dst += AEGIS_BLOCK_SIZE; |
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} |
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} |
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if (size > 0) { |
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union aegis_block msg = {}; |
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memcpy(msg.bytes, src, size); |
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tmp = state->blocks[2]; |
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crypto_aegis_block_and(&tmp, &state->blocks[3]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[4]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[1]); |
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crypto_aegis128_update_a(state, &msg, false); |
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crypto_aegis_block_xor(&msg, &tmp); |
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memcpy(dst, msg.bytes, size); |
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} |
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} |
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static void crypto_aegis128_decrypt_chunk(struct aegis_state *state, u8 *dst, |
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const u8 *src, unsigned int size) |
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{ |
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union aegis_block tmp; |
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if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) { |
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while (size >= AEGIS_BLOCK_SIZE) { |
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union aegis_block *dst_blk = |
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(union aegis_block *)dst; |
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const union aegis_block *src_blk = |
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(const union aegis_block *)src; |
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tmp = state->blocks[2]; |
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crypto_aegis_block_and(&tmp, &state->blocks[3]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[4]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[1]); |
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crypto_aegis_block_xor(&tmp, src_blk); |
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crypto_aegis128_update_a(state, &tmp, false); |
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*dst_blk = tmp; |
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size -= AEGIS_BLOCK_SIZE; |
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src += AEGIS_BLOCK_SIZE; |
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dst += AEGIS_BLOCK_SIZE; |
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} |
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} else { |
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while (size >= AEGIS_BLOCK_SIZE) { |
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tmp = state->blocks[2]; |
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crypto_aegis_block_and(&tmp, &state->blocks[3]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[4]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[1]); |
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crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE); |
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crypto_aegis128_update_a(state, &tmp, false); |
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memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE); |
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size -= AEGIS_BLOCK_SIZE; |
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src += AEGIS_BLOCK_SIZE; |
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dst += AEGIS_BLOCK_SIZE; |
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} |
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} |
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if (size > 0) { |
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union aegis_block msg = {}; |
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memcpy(msg.bytes, src, size); |
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tmp = state->blocks[2]; |
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crypto_aegis_block_and(&tmp, &state->blocks[3]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[4]); |
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crypto_aegis_block_xor(&tmp, &state->blocks[1]); |
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crypto_aegis_block_xor(&msg, &tmp); |
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memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size); |
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crypto_aegis128_update_a(state, &msg, false); |
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memcpy(dst, msg.bytes, size); |
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} |
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} |
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static void crypto_aegis128_process_ad(struct aegis_state *state, |
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struct scatterlist *sg_src, |
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unsigned int assoclen, |
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bool do_simd) |
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{ |
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struct scatter_walk walk; |
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union aegis_block buf; |
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unsigned int pos = 0; |
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scatterwalk_start(&walk, sg_src); |
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while (assoclen != 0) { |
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unsigned int size = scatterwalk_clamp(&walk, assoclen); |
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unsigned int left = size; |
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void *mapped = scatterwalk_map(&walk); |
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const u8 *src = (const u8 *)mapped; |
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if (pos + size >= AEGIS_BLOCK_SIZE) { |
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if (pos > 0) { |
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unsigned int fill = AEGIS_BLOCK_SIZE - pos; |
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memcpy(buf.bytes + pos, src, fill); |
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crypto_aegis128_update_a(state, &buf, do_simd); |
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pos = 0; |
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left -= fill; |
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src += fill; |
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} |
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crypto_aegis128_ad(state, src, left, do_simd); |
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src += left & ~(AEGIS_BLOCK_SIZE - 1); |
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left &= AEGIS_BLOCK_SIZE - 1; |
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} |
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memcpy(buf.bytes + pos, src, left); |
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pos += left; |
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assoclen -= size; |
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scatterwalk_unmap(mapped); |
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scatterwalk_advance(&walk, size); |
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scatterwalk_done(&walk, 0, assoclen); |
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} |
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if (pos > 0) { |
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memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos); |
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crypto_aegis128_update_a(state, &buf, do_simd); |
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} |
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} |
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static __always_inline |
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int crypto_aegis128_process_crypt(struct aegis_state *state, |
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struct skcipher_walk *walk, |
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void (*crypt)(struct aegis_state *state, |
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u8 *dst, const u8 *src, |
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unsigned int size)) |
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{ |
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int err = 0; |
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while (walk->nbytes) { |
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unsigned int nbytes = walk->nbytes; |
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if (nbytes < walk->total) |
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nbytes = round_down(nbytes, walk->stride); |
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crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes); |
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err = skcipher_walk_done(walk, walk->nbytes - nbytes); |
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} |
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return err; |
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} |
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static void crypto_aegis128_final(struct aegis_state *state, |
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union aegis_block *tag_xor, |
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u64 assoclen, u64 cryptlen) |
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{ |
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u64 assocbits = assoclen * 8; |
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u64 cryptbits = cryptlen * 8; |
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union aegis_block tmp; |
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unsigned int i; |
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tmp.words64[0] = cpu_to_le64(assocbits); |
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tmp.words64[1] = cpu_to_le64(cryptbits); |
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crypto_aegis_block_xor(&tmp, &state->blocks[3]); |
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for (i = 0; i < 7; i++) |
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crypto_aegis128_update_a(state, &tmp, false); |
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for (i = 0; i < AEGIS128_STATE_BLOCKS; i++) |
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crypto_aegis_block_xor(tag_xor, &state->blocks[i]); |
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} |
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static int crypto_aegis128_setkey(struct crypto_aead *aead, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct aegis_ctx *ctx = crypto_aead_ctx(aead); |
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if (keylen != AEGIS128_KEY_SIZE) |
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return -EINVAL; |
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memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE); |
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return 0; |
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} |
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static int crypto_aegis128_setauthsize(struct crypto_aead *tfm, |
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unsigned int authsize) |
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{ |
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if (authsize > AEGIS128_MAX_AUTH_SIZE) |
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return -EINVAL; |
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if (authsize < AEGIS128_MIN_AUTH_SIZE) |
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return -EINVAL; |
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return 0; |
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} |
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static int crypto_aegis128_encrypt_generic(struct aead_request *req) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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union aegis_block tag = {}; |
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unsigned int authsize = crypto_aead_authsize(tfm); |
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struct aegis_ctx *ctx = crypto_aead_ctx(tfm); |
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unsigned int cryptlen = req->cryptlen; |
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struct skcipher_walk walk; |
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struct aegis_state state; |
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skcipher_walk_aead_encrypt(&walk, req, false); |
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crypto_aegis128_init(&state, &ctx->key, req->iv); |
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, false); |
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crypto_aegis128_process_crypt(&state, &walk, |
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crypto_aegis128_encrypt_chunk); |
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crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen); |
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scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen, |
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authsize, 1); |
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return 0; |
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} |
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static int crypto_aegis128_decrypt_generic(struct aead_request *req) |
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{ |
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static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {}; |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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union aegis_block tag; |
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unsigned int authsize = crypto_aead_authsize(tfm); |
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unsigned int cryptlen = req->cryptlen - authsize; |
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struct aegis_ctx *ctx = crypto_aead_ctx(tfm); |
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struct skcipher_walk walk; |
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struct aegis_state state; |
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scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen, |
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authsize, 0); |
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skcipher_walk_aead_decrypt(&walk, req, false); |
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crypto_aegis128_init(&state, &ctx->key, req->iv); |
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, false); |
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crypto_aegis128_process_crypt(&state, &walk, |
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crypto_aegis128_decrypt_chunk); |
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crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen); |
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|
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if (unlikely(crypto_memneq(tag.bytes, zeros, authsize))) { |
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/* |
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* From Chapter 4. 'Security Analysis' of the AEGIS spec [0] |
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* |
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* "3. If verification fails, the decrypted plaintext and the |
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* wrong authentication tag should not be given as output." |
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* |
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* [0] https://competitions.cr.yp.to/round3/aegisv11.pdf |
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*/ |
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skcipher_walk_aead_decrypt(&walk, req, false); |
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crypto_aegis128_process_crypt(NULL, &walk, |
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crypto_aegis128_wipe_chunk); |
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memzero_explicit(&tag, sizeof(tag)); |
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return -EBADMSG; |
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} |
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return 0; |
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} |
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static int crypto_aegis128_encrypt_simd(struct aead_request *req) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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union aegis_block tag = {}; |
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unsigned int authsize = crypto_aead_authsize(tfm); |
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struct aegis_ctx *ctx = crypto_aead_ctx(tfm); |
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unsigned int cryptlen = req->cryptlen; |
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struct skcipher_walk walk; |
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struct aegis_state state; |
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if (!aegis128_do_simd()) |
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return crypto_aegis128_encrypt_generic(req); |
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skcipher_walk_aead_encrypt(&walk, req, false); |
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crypto_aegis128_init_simd(&state, &ctx->key, req->iv); |
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, true); |
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crypto_aegis128_process_crypt(&state, &walk, |
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crypto_aegis128_encrypt_chunk_simd); |
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crypto_aegis128_final_simd(&state, &tag, req->assoclen, cryptlen, 0); |
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|
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scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen, |
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authsize, 1); |
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return 0; |
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} |
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static int crypto_aegis128_decrypt_simd(struct aead_request *req) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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union aegis_block tag; |
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unsigned int authsize = crypto_aead_authsize(tfm); |
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unsigned int cryptlen = req->cryptlen - authsize; |
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struct aegis_ctx *ctx = crypto_aead_ctx(tfm); |
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struct skcipher_walk walk; |
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struct aegis_state state; |
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if (!aegis128_do_simd()) |
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return crypto_aegis128_decrypt_generic(req); |
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scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen, |
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authsize, 0); |
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skcipher_walk_aead_decrypt(&walk, req, false); |
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crypto_aegis128_init_simd(&state, &ctx->key, req->iv); |
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, true); |
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crypto_aegis128_process_crypt(&state, &walk, |
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crypto_aegis128_decrypt_chunk_simd); |
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|
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if (unlikely(crypto_aegis128_final_simd(&state, &tag, req->assoclen, |
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cryptlen, authsize))) { |
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skcipher_walk_aead_decrypt(&walk, req, false); |
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crypto_aegis128_process_crypt(NULL, &walk, |
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crypto_aegis128_wipe_chunk); |
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return -EBADMSG; |
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} |
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return 0; |
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} |
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|
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static struct aead_alg crypto_aegis128_alg_generic = { |
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.setkey = crypto_aegis128_setkey, |
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.setauthsize = crypto_aegis128_setauthsize, |
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.encrypt = crypto_aegis128_encrypt_generic, |
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.decrypt = crypto_aegis128_decrypt_generic, |
|
|
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.ivsize = AEGIS128_NONCE_SIZE, |
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.maxauthsize = AEGIS128_MAX_AUTH_SIZE, |
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.chunksize = AEGIS_BLOCK_SIZE, |
|
|
|
.base.cra_blocksize = 1, |
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.base.cra_ctxsize = sizeof(struct aegis_ctx), |
|
.base.cra_alignmask = 0, |
|
.base.cra_priority = 100, |
|
.base.cra_name = "aegis128", |
|
.base.cra_driver_name = "aegis128-generic", |
|
.base.cra_module = THIS_MODULE, |
|
}; |
|
|
|
static struct aead_alg crypto_aegis128_alg_simd = { |
|
.setkey = crypto_aegis128_setkey, |
|
.setauthsize = crypto_aegis128_setauthsize, |
|
.encrypt = crypto_aegis128_encrypt_simd, |
|
.decrypt = crypto_aegis128_decrypt_simd, |
|
|
|
.ivsize = AEGIS128_NONCE_SIZE, |
|
.maxauthsize = AEGIS128_MAX_AUTH_SIZE, |
|
.chunksize = AEGIS_BLOCK_SIZE, |
|
|
|
.base.cra_blocksize = 1, |
|
.base.cra_ctxsize = sizeof(struct aegis_ctx), |
|
.base.cra_alignmask = 0, |
|
.base.cra_priority = 200, |
|
.base.cra_name = "aegis128", |
|
.base.cra_driver_name = "aegis128-simd", |
|
.base.cra_module = THIS_MODULE, |
|
}; |
|
|
|
static int __init crypto_aegis128_module_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = crypto_register_aead(&crypto_aegis128_alg_generic); |
|
if (ret) |
|
return ret; |
|
|
|
if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && |
|
crypto_aegis128_have_simd()) { |
|
ret = crypto_register_aead(&crypto_aegis128_alg_simd); |
|
if (ret) { |
|
crypto_unregister_aead(&crypto_aegis128_alg_generic); |
|
return ret; |
|
} |
|
static_branch_enable(&have_simd); |
|
} |
|
return 0; |
|
} |
|
|
|
static void __exit crypto_aegis128_module_exit(void) |
|
{ |
|
if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && |
|
crypto_aegis128_have_simd()) |
|
crypto_unregister_aead(&crypto_aegis128_alg_simd); |
|
|
|
crypto_unregister_aead(&crypto_aegis128_alg_generic); |
|
} |
|
|
|
subsys_initcall(crypto_aegis128_module_init); |
|
module_exit(crypto_aegis128_module_exit); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Ondrej Mosnacek <[email protected]>"); |
|
MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm"); |
|
MODULE_ALIAS_CRYPTO("aegis128"); |
|
MODULE_ALIAS_CRYPTO("aegis128-generic"); |
|
MODULE_ALIAS_CRYPTO("aegis128-simd");
|
|
|