aesni: Add a CCM AEAD reusing the key schedule
This commit is contained in:
Martin Willi
parent
8488dea2f9
commit
1ae46dfba2
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@ -16,6 +16,7 @@ libstrongswan_aesni_la_SOURCES = \
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aesni_key.h aesni_key.c \
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aesni_cbc.h aesni_cbc.c \
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aesni_ctr.h aesni_ctr.c \
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aesni_ccm.h aesni_ccm.c \
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aesni_plugin.h aesni_plugin.c
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libstrongswan_aesni_la_LDFLAGS = -module -avoid-version
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@ -0,0 +1,583 @@
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/*
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* Copyright (C) 2010-2015 Martin Willi
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* Copyright (C) 2010-2015 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "aesni_ccm.h"
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#include "aesni_key.h"
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#include <crypto/iv/iv_gen_seq.h>
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#include <tmmintrin.h>
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#define SALT_SIZE 3
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#define IV_SIZE 8
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#define NONCE_SIZE (SALT_SIZE + IV_SIZE) /* 11 */
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#define Q_SIZE (AES_BLOCK_SIZE - NONCE_SIZE - 1) /* 4 */
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typedef struct private_aesni_ccm_t private_aesni_ccm_t;
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/**
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* CCM en/decryption method type
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*/
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typedef void (*aesni_ccm_fn_t)(private_aesni_ccm_t*, size_t, u_char*, u_char*,
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u_char*, size_t, u_char*, u_char*);
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/**
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* Private data of an aesni_ccm_t object.
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*/
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struct private_aesni_ccm_t {
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/**
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* Public aesni_ccm_t interface.
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*/
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aesni_ccm_t public;
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/**
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* Encryption key schedule
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*/
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aesni_key_t *key;
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/**
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* IV generator.
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*/
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iv_gen_t *iv_gen;
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/**
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* Length of the integrity check value
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*/
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size_t icv_size;
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/**
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* Length of the key in bytes
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*/
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size_t key_size;
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/**
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* CCM encryption function
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*/
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aesni_ccm_fn_t encrypt;
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/**
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* CCM decryption function
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*/
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aesni_ccm_fn_t decrypt;
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/**
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* salt to add to nonce
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*/
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u_char salt[SALT_SIZE];
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};
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/**
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* First block with control information
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*/
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typedef struct __attribute__((packed)) {
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BITFIELD4(u_int8_t,
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/* size of p length field q, as q-1 */
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q_len: 3,
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/* size of our ICV t, as (t-2)/2 */
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t_len: 3,
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/* do we have associated data */
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assoc: 1,
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reserved: 1,
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) flags;
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/* nonce value */
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struct __attribute__((packed)) {
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u_char salt[SALT_SIZE];
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u_char iv[IV_SIZE];
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} nonce;
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/* length of plain text, q */
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u_char q[Q_SIZE];
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} b0_t;
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/**
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* Counter block
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*/
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typedef struct __attribute__((packed)) {
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BITFIELD3(u_int8_t,
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/* size of p length field q, as q-1 */
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q_len: 3,
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zero: 3,
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reserved: 2,
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) flags;
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/* nonce value */
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struct __attribute__((packed)) {
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u_char salt[SALT_SIZE];
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u_char iv[IV_SIZE];
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} nonce;
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/* counter value */
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u_char i[Q_SIZE];
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} ctr_t;
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/**
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* Build the first block B0
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*/
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static void build_b0(private_aesni_ccm_t *this, size_t len, size_t alen,
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u_char *iv, void *out)
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{
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b0_t *block = out;
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block->flags.reserved = 0;
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block->flags.assoc = alen ? 1 : 0;
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block->flags.t_len = (this->icv_size - 2) / 2;
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block->flags.q_len = Q_SIZE - 1;
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memcpy(block->nonce.salt, this->salt, SALT_SIZE);
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memcpy(block->nonce.iv, iv, IV_SIZE);
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htoun32(block->q, len);
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}
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/**
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* Build a counter block for counter i
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*/
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static void build_ctr(private_aesni_ccm_t *this, u_int32_t i, u_char *iv,
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void *out)
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{
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ctr_t *ctr = out;
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ctr->flags.reserved = 0;
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ctr->flags.zero = 0;
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ctr->flags.q_len = Q_SIZE - 1;
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memcpy(ctr->nonce.salt, this->salt, SALT_SIZE);
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memcpy(ctr->nonce.iv, iv, IV_SIZE);
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htoun32(ctr->i, i);
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}
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/**
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* Calculate the ICV for the b0 and associated data
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*/
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static __m128i icv_header(private_aesni_ccm_t *this, size_t len, u_char *iv,
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u_int16_t alen, u_char *assoc)
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{
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__m128i b, t, c;
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u_int i, round, blocks, rem;
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build_b0(this, len, alen, iv, &b);
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c = _mm_loadu_si128(&b);
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c = _mm_xor_si128(c, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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c = _mm_aesenc_si128(c, this->key->schedule[round]);
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}
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c = _mm_aesenclast_si128(c, this->key->schedule[this->key->rounds]);
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if (alen)
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{
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blocks = (alen + sizeof(alen)) / AES_BLOCK_SIZE;
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rem = (alen + sizeof(alen)) % AES_BLOCK_SIZE;
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if (rem)
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{
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blocks++;
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}
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for (i = 0; i < blocks; i++)
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{
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if (i == 0)
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{ /* first block */
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memset(&b, 0, sizeof(b));
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htoun16(&b, alen);
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memcpy(((u_char*)&b) + sizeof(alen), assoc,
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min(alen, sizeof(b) - sizeof(alen)));
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t = _mm_loadu_si128(&b);
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}
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else if (i == blocks - 1 && rem)
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{ /* last block with padding */
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memset(&b, 0, sizeof(b));
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memcpy(&b, ((__m128i*)(assoc - sizeof(alen))) + i, rem);
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t = _mm_loadu_si128(&b);
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}
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else
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{ /* full block */
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t = _mm_loadu_si128(((__m128i*)(assoc - sizeof(alen))) + i);
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}
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c = _mm_xor_si128(t, c);
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c = _mm_xor_si128(c, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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c = _mm_aesenc_si128(c, this->key->schedule[round]);
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}
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c = _mm_aesenclast_si128(c, this->key->schedule[this->key->rounds]);
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}
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}
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return c;
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}
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/**
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* En-/Decrypt the ICV, trim and store it
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*/
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static void crypt_icv(private_aesni_ccm_t *this, u_char *iv,
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__m128i c, u_char *icv)
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{
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__m128i b, t;
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u_int round;
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build_ctr(this, 0, iv, &b);
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t = _mm_loadu_si128(&b);
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t = _mm_xor_si128(t, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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t = _mm_xor_si128(t, c);
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_mm_storeu_si128(&b, t);
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memcpy(icv, &b, this->icv_size);
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}
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/**
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* Do big-endian increment on x
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*/
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static inline __m128i increment_be(__m128i x)
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{
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__m128i swap;
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swap = _mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
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x = _mm_shuffle_epi8(x, swap);
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x = _mm_add_epi64(x, _mm_set_epi32(0, 0, 0, 1));
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x = _mm_shuffle_epi8(x, swap);
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return x;
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}
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/**
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* Encrypt a remaining incomplete block
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*/
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static __m128i encrypt_ccm_rem(aesni_key_t *key, u_int rem, __m128i state,
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void *in, void *out, __m128i c)
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{
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__m128i t, b, d;
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u_int round;
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memset(&b, 0, sizeof(b));
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memcpy(&b, in, rem);
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d = _mm_loadu_si128(&b);
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c = _mm_xor_si128(d, c);
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c = _mm_xor_si128(c, key->schedule[0]);
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t = _mm_xor_si128(state, key->schedule[0]);
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for (round = 1; round < key->rounds; round++)
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{
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c = _mm_aesenc_si128(c, key->schedule[round]);
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t = _mm_aesenc_si128(t, key->schedule[round]);
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}
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c = _mm_aesenclast_si128(c, key->schedule[key->rounds]);
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t = _mm_aesenclast_si128(t, key->schedule[key->rounds]);
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t = _mm_xor_si128(t, d);
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_mm_storeu_si128(&b, t);
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memcpy(out, &b, rem);
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return c;
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}
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/**
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* Decrypt a remaining incomplete block
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*/
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static __m128i decrypt_ccm_rem(aesni_key_t *key, u_int rem, __m128i state,
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void *in, void *out, __m128i c)
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{
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__m128i t, b, d;
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u_int round;
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memset(&b, 0, sizeof(b));
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memcpy(&b, in, rem);
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d = _mm_loadu_si128(&b);
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t = _mm_xor_si128(state, key->schedule[0]);
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for (round = 1; round < key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, key->schedule[key->rounds]);
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t = _mm_xor_si128(t, d);
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_mm_storeu_si128(&b, t);
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memset((u_char*)&b + rem, 0, sizeof(b) - rem);
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t = _mm_loadu_si128(&b);
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c = _mm_xor_si128(t, c);
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c = _mm_xor_si128(c, key->schedule[0]);
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for (round = 1; round < key->rounds; round++)
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{
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c = _mm_aesenc_si128(c, key->schedule[round]);
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}
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c = _mm_aesenclast_si128(c, key->schedule[key->rounds]);
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memcpy(out, &b, rem);
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return c;
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}
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/**
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* Generic CCM encryption/ICV generation
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*/
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static void encrypt_ccm(private_aesni_ccm_t *this,
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size_t len, u_char *in, u_char *out, u_char *iv,
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size_t alen, u_char *assoc, u_char *icv)
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{
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__m128i d, t, c, b, state, *bi, *bo;
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u_int round, blocks, rem, i;
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c = icv_header(this, len, iv, alen, assoc);
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build_ctr(this, 1, iv, &b);
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state = _mm_load_si128(&b);
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blocks = len / AES_BLOCK_SIZE;
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rem = len % AES_BLOCK_SIZE;
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bi = (__m128i*)in;
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bo = (__m128i*)out;
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for (i = 0; i < blocks; i++)
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{
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d = _mm_loadu_si128(bi + i);
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c = _mm_xor_si128(d, c);
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c = _mm_xor_si128(c, this->key->schedule[0]);
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t = _mm_xor_si128(state, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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c = _mm_aesenc_si128(c, this->key->schedule[round]);
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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c = _mm_aesenclast_si128(c, this->key->schedule[this->key->rounds]);
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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t = _mm_xor_si128(t, d);
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_mm_storeu_si128(bo + i, t);
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state = increment_be(state);
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}
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if (rem)
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{
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c = encrypt_ccm_rem(this->key, rem, state, bi + blocks, bo + blocks, c);
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}
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crypt_icv(this, iv, c, icv);
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}
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/**
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* Generic CCM decryption/ICV generation
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*/
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static void decrypt_ccm(private_aesni_ccm_t *this,
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size_t len, u_char *in, u_char *out, u_char *iv,
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size_t alen, u_char *assoc, u_char *icv)
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{
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__m128i d, t, c, b, state, *bi, *bo;
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u_int round, blocks, rem, i;
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c = icv_header(this, len, iv, alen, assoc);
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build_ctr(this, 1, iv, &b);
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state = _mm_load_si128(&b);
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blocks = len / AES_BLOCK_SIZE;
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rem = len % AES_BLOCK_SIZE;
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bi = (__m128i*)in;
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bo = (__m128i*)out;
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for (i = 0; i < blocks; i++)
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{
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d = _mm_loadu_si128(bi + i);
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t = _mm_xor_si128(state, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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t = _mm_xor_si128(t, d);
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_mm_storeu_si128(bo + i, t);
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c = _mm_xor_si128(t, c);
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c = _mm_xor_si128(c, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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c = _mm_aesenc_si128(c, this->key->schedule[round]);
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}
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c = _mm_aesenclast_si128(c, this->key->schedule[this->key->rounds]);
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state = increment_be(state);
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}
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if (rem)
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{
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c = decrypt_ccm_rem(this->key, rem, state, bi + blocks, bo + blocks, c);
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}
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crypt_icv(this, iv, c, icv);
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}
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METHOD(aead_t, encrypt, bool,
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private_aesni_ccm_t *this, chunk_t plain, chunk_t assoc, chunk_t iv,
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chunk_t *encr)
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{
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u_char *out;
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if (!this->key || iv.len != IV_SIZE)
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{
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return FALSE;
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}
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out = plain.ptr;
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if (encr)
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{
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*encr = chunk_alloc(plain.len + this->icv_size);
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out = encr->ptr;
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}
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this->encrypt(this, plain.len, plain.ptr, out, iv.ptr,
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assoc.len, assoc.ptr, out + plain.len);
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return TRUE;
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}
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METHOD(aead_t, decrypt, bool,
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private_aesni_ccm_t *this, chunk_t encr, chunk_t assoc, chunk_t iv,
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chunk_t *plain)
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{
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u_char *out, icv[this->icv_size];
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if (!this->key || iv.len != IV_SIZE || encr.len < this->icv_size)
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{
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return FALSE;
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}
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encr.len -= this->icv_size;
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out = encr.ptr;
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if (plain)
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{
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*plain = chunk_alloc(encr.len);
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out = plain->ptr;
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}
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this->decrypt(this, encr.len, encr.ptr, out, iv.ptr,
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assoc.len, assoc.ptr, icv);
|
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return memeq_const(icv, encr.ptr + encr.len, this->icv_size);
|
||||
}
|
||||
|
||||
METHOD(aead_t, get_block_size, size_t,
|
||||
private_aesni_ccm_t *this)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
METHOD(aead_t, get_icv_size, size_t,
|
||||
private_aesni_ccm_t *this)
|
||||
{
|
||||
return this->icv_size;
|
||||
}
|
||||
|
||||
METHOD(aead_t, get_iv_size, size_t,
|
||||
private_aesni_ccm_t *this)
|
||||
{
|
||||
return IV_SIZE;
|
||||
}
|
||||
|
||||
METHOD(aead_t, get_iv_gen, iv_gen_t*,
|
||||
private_aesni_ccm_t *this)
|
||||
{
|
||||
return this->iv_gen;
|
||||
}
|
||||
|
||||
METHOD(aead_t, get_key_size, size_t,
|
||||
private_aesni_ccm_t *this)
|
||||
{
|
||||
return this->key_size + SALT_SIZE;
|
||||
}
|
||||
|
||||
METHOD(aead_t, set_key, bool,
|
||||
private_aesni_ccm_t *this, chunk_t key)
|
||||
{
|
||||
if (key.len != this->key_size + SALT_SIZE)
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
memcpy(this->salt, key.ptr + key.len - SALT_SIZE, SALT_SIZE);
|
||||
key.len -= SALT_SIZE;
|
||||
|
||||
DESTROY_IF(this->key);
|
||||
this->key = aesni_key_create(TRUE, key);
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
METHOD(aead_t, destroy, void,
|
||||
private_aesni_ccm_t *this)
|
||||
{
|
||||
DESTROY_IF(this->key);
|
||||
this->iv_gen->destroy(this->iv_gen);
|
||||
free(this);
|
||||
}
|
||||
|
||||
/**
|
||||
* See header
|
||||
*/
|
||||
aesni_ccm_t *aesni_ccm_create(encryption_algorithm_t algo,
|
||||
size_t key_size, size_t salt_size)
|
||||
{
|
||||
private_aesni_ccm_t *this;
|
||||
size_t icv_size;
|
||||
|
||||
switch (key_size)
|
||||
{
|
||||
case 0:
|
||||
key_size = 16;
|
||||
break;
|
||||
case 16:
|
||||
case 24:
|
||||
case 32:
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
if (salt_size && salt_size != SALT_SIZE)
|
||||
{
|
||||
/* currently not supported */
|
||||
return NULL;
|
||||
}
|
||||
switch (algo)
|
||||
{
|
||||
case ENCR_AES_CCM_ICV8:
|
||||
algo = ENCR_AES_CBC;
|
||||
icv_size = 8;
|
||||
break;
|
||||
case ENCR_AES_CCM_ICV12:
|
||||
algo = ENCR_AES_CBC;
|
||||
icv_size = 12;
|
||||
break;
|
||||
case ENCR_AES_CCM_ICV16:
|
||||
algo = ENCR_AES_CBC;
|
||||
icv_size = 16;
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
INIT(this,
|
||||
.public = {
|
||||
.aead = {
|
||||
.encrypt = _encrypt,
|
||||
.decrypt = _decrypt,
|
||||
.get_block_size = _get_block_size,
|
||||
.get_icv_size = _get_icv_size,
|
||||
.get_iv_size = _get_iv_size,
|
||||
.get_iv_gen = _get_iv_gen,
|
||||
.get_key_size = _get_key_size,
|
||||
.set_key = _set_key,
|
||||
.destroy = _destroy,
|
||||
},
|
||||
},
|
||||
.key_size = key_size,
|
||||
.iv_gen = iv_gen_seq_create(),
|
||||
.icv_size = icv_size,
|
||||
.encrypt = encrypt_ccm,
|
||||
.decrypt = decrypt_ccm,
|
||||
);
|
||||
|
||||
return &this->public;
|
||||
}
|
||||
|
|
@ -0,0 +1,50 @@
|
|||
/*
|
||||
* Copyright (C) 2015 Martin Willi
|
||||
* Copyright (C) 2015 revosec AG
|
||||
*
|
||||
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @defgroup aesni_ccm aesni_ccm
|
||||
* @{ @ingroup aesni
|
||||
*/
|
||||
|
||||
#ifndef AESNI_CCM_H_
|
||||
#define AESNI_CCM_H_
|
||||
|
||||
#include <library.h>
|
||||
|
||||
typedef struct aesni_ccm_t aesni_ccm_t;
|
||||
|
||||
/**
|
||||
* CCM mode AEAD using AES-NI
|
||||
*/
|
||||
struct aesni_ccm_t {
|
||||
|
||||
/**
|
||||
* Implements aead_t interface
|
||||
*/
|
||||
aead_t aead;
|
||||
};
|
||||
|
||||
/**
|
||||
* Create a aesni_ccm instance.
|
||||
*
|
||||
* @param algo encryption algorithm, ENCR_AES_CCM*
|
||||
* @param key_size AES key size, in bytes
|
||||
* @param salt_size size of salt value
|
||||
* @return AES-CCM AEAD, NULL if not supported
|
||||
*/
|
||||
aesni_ccm_t *aesni_ccm_create(encryption_algorithm_t algo,
|
||||
size_t key_size, size_t salt_size);
|
||||
|
||||
#endif /** AESNI_CCM_H_ @}*/
|
||||
|
|
@ -16,6 +16,7 @@
|
|||
#include "aesni_plugin.h"
|
||||
#include "aesni_cbc.h"
|
||||
#include "aesni_ctr.h"
|
||||
#include "aesni_ccm.h"
|
||||
|
||||
#include <stdio.h>
|
||||
|
||||
|
|
@ -55,6 +56,16 @@ METHOD(plugin_t, get_features, int,
|
|||
PLUGIN_PROVIDE(CRYPTER, ENCR_AES_CTR, 16),
|
||||
PLUGIN_PROVIDE(CRYPTER, ENCR_AES_CTR, 24),
|
||||
PLUGIN_PROVIDE(CRYPTER, ENCR_AES_CTR, 32),
|
||||
PLUGIN_REGISTER(AEAD, aesni_ccm_create),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 16),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 16),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 16),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 24),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 24),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 24),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 32),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 32),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 32),
|
||||
};
|
||||
|
||||
*features = f;
|
||||
|
|
|
|||
Loading…
Reference in New Issue