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Differential D10512 Diff 31487 sys/boot/boot_crypto/boot_crypto_aes.c

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sys/boot/boot_crypto/boot_crypto_aes.c

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/*-
* Copyright (c) 2016 Eric McCorkle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <stddef.h>
#include <string.h>
#include "boot_crypto.h"
#include "boot_crypto_aes.h"
static int
aes_xts_ctxinit(symmetric_alg_ctx_t *ptr, int enc __unused,
const u_char *key, size_t keylen, u_char *iv)
{
struct aes_xts_ctx *ctx = &ptr->aes_xts;
u_int64_t blocknum;
size_t xts_len = keylen << 1;
u_int i;
rijndael_set_key(&(ctx->key1), key, xts_len / 2);
rijndael_set_key(&(ctx->key2), key + (xts_len / 16), xts_len / 2);
/*
* Prepare tweak as E_k2(IV). IV is specified as LE representation
* of a 64-bit block number which we allow to be passed in directly.
*/
bcopy(iv, &blocknum, AES_XTS_IVSIZE);
for (i = 0; i < AES_XTS_IVSIZE; i++) {
ctx->tweak[i] = blocknum & 0xff;
blocknum >>= 8;
}
/* Last 64 bits of IV are always zero */
bzero(ctx->tweak + AES_XTS_IVSIZE, AES_XTS_IVSIZE);
rijndael_encrypt(&ctx->key2, ctx->tweak, ctx->tweak);
return (0);
}
static int
aes_xts_decrypt_block(symmetric_alg_ctx_t *ptr, u_char *data)
{
struct aes_xts_ctx *ctx = &ptr->aes_xts;
u_int8_t block[AES_XTS_BLOCKSIZE];
u_int i, carry_in, carry_out;
for (i = 0; i < AES_XTS_BLOCKSIZE; i++)
block[i] = data[i] ^ ctx->tweak[i];
rijndael_decrypt(&ctx->key1, block, data);
for (i = 0; i < AES_XTS_BLOCKSIZE; i++)
data[i] ^= ctx->tweak[i];
/* Exponentiate tweak */
carry_in = 0;
for (i = 0; i < AES_XTS_BLOCKSIZE; i++) {
carry_out = ctx->tweak[i] & 0x80;
ctx->tweak[i] = (ctx->tweak[i] << 1) | (carry_in ? 1 : 0);
carry_in = carry_out;
}
if (carry_in)
ctx->tweak[0] ^= AES_XTS_ALPHA;
bzero(block, sizeof(block));
return (0);
}
static int
aes_xts_decrypt(symmetric_alg_ctx_t *ctx, u_char *data, size_t len)
{
u_int i;
for (i = 0; i < len; i += AES_XTS_BLOCKSIZE) {
aes_xts_decrypt_block(ctx, data + i);
}
return (0);
allanjudeUnsubmitted
Not Done
Inline Actions

sys/boot/boot_crypto/boot_crypto_aes.c:99:1: warning: control reaches end of non-void function [-Wreturn-type]

allanjude: sys/boot/boot_crypto/boot_crypto_aes.c:99:1: warning: control reaches end of non-void function…
}
static int
aes_xts_encrypt_block(symmetric_alg_ctx_t *ptr, u_char *data)
{
struct aes_xts_ctx *ctx = &ptr->aes_xts;
u_int8_t block[AES_XTS_BLOCKSIZE];
u_int i, carry_in, carry_out;
for (i = 0; i < AES_XTS_BLOCKSIZE; i++)
block[i] = data[i] ^ ctx->tweak[i];
rijndael_encrypt(&ctx->key1, block, data);
for (i = 0; i < AES_XTS_BLOCKSIZE; i++)
data[i] ^= ctx->tweak[i];
/* Exponentiate tweak */
carry_in = 0;
for (i = 0; i < AES_XTS_BLOCKSIZE; i++) {
carry_out = ctx->tweak[i] & 0x80;
ctx->tweak[i] = (ctx->tweak[i] << 1) | (carry_in ? 1 : 0);
carry_in = carry_out;
}
if (carry_in)
ctx->tweak[0] ^= AES_XTS_ALPHA;
bzero(block, sizeof(block));
return (0);
}
static int
aes_xts_encrypt(symmetric_alg_ctx_t *ctx, u_char *data, size_t len)
{
u_int i;
for (i = 0; i < len; i += AES_XTS_BLOCKSIZE) {
aes_xts_encrypt_block(ctx, data + i);
}
allanjudeUnsubmitted
Done
Inline Actions

sys/boot/boot_crypto/boot_crypto_aes.c:138:1: warning: control reaches end of non-void function [-Wreturn-type]

allanjude: sys/boot/boot_crypto/boot_crypto_aes.c:138:1: warning: control reaches end of non-void function…
return (0);
}
static int
aes_cbc_ctxinit(symmetric_alg_ctx_t *ptr, int enc, const u_char *key,
size_t keylen, u_char *iv)
{
struct aes_cbc_ctx *ctx = &ptr->aes_cbc;
int err;
err = rijndael_makeKey(&ctx->aeskey, !enc, keylen,
(const char *)key);
if (err < 0) {
return (err);
}
err = rijndael_cipherInit(&ctx->cipher, MODE_CBC, iv);
if (err < 0) {
return (err);
}
return (0);
}
static int
aes_cbc_decrypt(symmetric_alg_ctx_t *ptr, u_char *data, size_t len)
{
struct aes_cbc_ctx *ctx = &ptr->aes_cbc;
int blks;
blks = rijndael_blockDecrypt(&ctx->cipher, &ctx->aeskey, data,
len * 8, data);
if (len != (blks / 8)) {
return (1);
} else {
return (0);
}
}
static int
aes_cbc_encrypt(symmetric_alg_ctx_t *ptr, u_char *data, size_t len)
{
struct aes_cbc_ctx *ctx = &ptr->aes_cbc;
int blks;
blks = rijndael_blockEncrypt(&ctx->cipher, &ctx->aeskey, data,
len * 8, data);
if (len != (blks / 8)) {
return (1);
} else {
return (0);
}
}
const symmetric_alg_t alg_aes_xts = {
.ctxinit = aes_xts_ctxinit,
.decrypt = aes_xts_decrypt,
.encrypt = aes_xts_encrypt
};
const symmetric_alg_t alg_aes_cbc = {
.ctxinit = aes_cbc_ctxinit,
.decrypt = aes_cbc_decrypt,
.encrypt = aes_cbc_encrypt
};