lkn
/
pcloudcc-lneely
mirror of https://github.com/lneely/pcloudcc-lneely.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
pcloudcc-lneely/lib/pclsync/pcrypto.c

733 lines
28 KiB
C
Raw Blame History

/*
Copyright (c) 2014 Anton Titov.
Copyright (c) 2014 pCloud Ltd. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met: Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
disclaimer. 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. Neither the name of pCloud Ltd nor the
names of its contributors may be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 pCloud
Ltd 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.
*/
#include "plibs.h"
#include "pcrypto.h"
#include "pmemlock.h"
#include <string.h>
#include <stddef.h>
typedef struct {
psync_sha512_ctx sha1ctx;
unsigned char final[PSYNC_SHA512_BLOCK_LEN+PSYNC_SHA512_DIGEST_LEN];
} psync_hmac_sha512_ctx;
static void psync_hmac_sha512_init(psync_hmac_sha512_ctx *ctx, const unsigned char *key, size_t keylen){
unsigned char keyxor[PSYNC_SHA512_BLOCK_LEN];
size_t i;
if (keylen>PSYNC_SHA512_BLOCK_LEN)
keylen=PSYNC_SHA512_BLOCK_LEN;
for (i=0; i<keylen; i++){
keyxor[i]=key[i]^0x36;
ctx->final[i]=key[i]^0x5c;
}
for (; i<PSYNC_SHA512_BLOCK_LEN; i++){
keyxor[i]=0x36;
ctx->final[i]=0x5c;
}
psync_sha512_init(&ctx->sha1ctx);
psync_sha512_update(&ctx->sha1ctx, keyxor, PSYNC_SHA512_BLOCK_LEN);
psync_ssl_memclean(keyxor, PSYNC_SHA512_BLOCK_LEN);
}
static void psync_hmac_sha512_update(psync_hmac_sha512_ctx *ctx, const void *data, size_t len){
psync_sha512_update(&ctx->sha1ctx, data, len);
}
static void psync_hmac_sha512_final(unsigned char *result, psync_hmac_sha512_ctx *ctx){
psync_sha512_final(ctx->final+PSYNC_SHA512_BLOCK_LEN, &ctx->sha1ctx);
psync_sha512(ctx->final, PSYNC_SHA512_BLOCK_LEN+PSYNC_SHA512_DIGEST_LEN, result);
psync_ssl_memclean(ctx->final, PSYNC_SHA512_BLOCK_LEN+PSYNC_SHA512_DIGEST_LEN);
}
static void psync_hmac_sha512(const unsigned char *msg, size_t msglen, const unsigned char *key, size_t keylen, unsigned char *result){
psync_sha512_ctx sha1ctx;
unsigned char keyxor[PSYNC_SHA512_BLOCK_LEN], final[PSYNC_SHA512_BLOCK_LEN+PSYNC_SHA512_DIGEST_LEN];
size_t i;
if (keylen>PSYNC_SHA512_BLOCK_LEN)
keylen=PSYNC_SHA512_BLOCK_LEN;
for (i=0; i<keylen; i++){
keyxor[i]=key[i]^0x36;
final[i]=key[i]^0x5c;
}
for (; i<PSYNC_SHA512_BLOCK_LEN; i++){
keyxor[i]=0x36;
final[i]=0x5c;
}
psync_sha512_init(&sha1ctx);
psync_sha512_update(&sha1ctx, keyxor, PSYNC_SHA512_BLOCK_LEN);
psync_sha512_update(&sha1ctx, msg, msglen);
psync_sha512_final(final+PSYNC_SHA512_BLOCK_LEN, &sha1ctx);
psync_sha512(final, PSYNC_SHA512_BLOCK_LEN+PSYNC_SHA512_DIGEST_LEN, result);
psync_ssl_memclean(keyxor, PSYNC_SHA512_BLOCK_LEN);
psync_ssl_memclean(final, PSYNC_SHA512_BLOCK_LEN+PSYNC_SHA512_DIGEST_LEN);
}
#define ALIGN_A256_BS(n) ((((n)+PSYNC_AES256_BLOCK_SIZE-1)/PSYNC_AES256_BLOCK_SIZE)*PSYNC_AES256_BLOCK_SIZE)
#define ALIGN_PTR_A256_BS(ptr) ((unsigned char *)ALIGN_A256_BS((uintptr_t)(ptr)))
#define IS_WORD_ALIGNED(ptr) (((uintptr_t)ptr)%sizeof(unsigned long)==0)
static void xor16_unaligned_inplace(unsigned char *data, const unsigned char *key){
psync_uint_t i;
for (i=0; i<PSYNC_AES256_BLOCK_SIZE; i++)
data[i]^=key[i];
}
#define LONG_DEREF(x, a) ((unsigned long *)(x))[a]
static void xor16_aligned_inplace(unsigned char *data, const unsigned char *key){
if (sizeof(unsigned long)==8){
LONG_DEREF(data, 0)^=LONG_DEREF(key, 0);
LONG_DEREF(data, 1)^=LONG_DEREF(key, 1);
}
else if (sizeof(unsigned long)==4){
LONG_DEREF(data, 0)^=LONG_DEREF(key, 0);
LONG_DEREF(data, 1)^=LONG_DEREF(key, 1);
LONG_DEREF(data, 2)^=LONG_DEREF(key, 2);
LONG_DEREF(data, 3)^=LONG_DEREF(key, 3);
}
else
xor16_unaligned_inplace(data, key);
}
static void xor_cnt_inplace(unsigned char *data, const unsigned char *key, size_t count){
size_t i;
for (i=0; i<count; i++)
data[i]^=key[i];
}
static void copy_iv_and_xor_with_counter(unsigned char *dest, const unsigned char *iv, uint64_t counter){
if (sizeof(unsigned long)==8){
LONG_DEREF(dest, 0)=LONG_DEREF(iv, 0)^counter;
}
else if (sizeof(unsigned long)==4){
LONG_DEREF(dest, 0)=LONG_DEREF(iv, 0)^(counter&0xffffffffU);
LONG_DEREF(dest, 1)=LONG_DEREF(iv, 1)^(counter>>32);
}
}
psync_symmetric_key_t psync_crypto_aes256_gen_key_len(size_t len){
psync_symmetric_key_t key;
key=(psync_symmetric_key_t)psync_locked_malloc(offsetof(psync_symmetric_key_struct_t, key)+len);
key->keylen=len;
psync_ssl_rand_strong(key->key, len);
return key;
}
psync_symmetric_key_t psync_crypto_aes256_ctr_gen_key(){
return psync_crypto_aes256_gen_key_len(PSYNC_AES256_KEY_SIZE+PSYNC_AES256_BLOCK_SIZE);
}
psync_crypto_aes256_ctr_encoder_decoder_t psync_crypto_aes256_ctr_encoder_decoder_create(psync_symmetric_key_t key){
psync_aes256_encoder enc;
psync_crypto_aes256_ctr_encoder_decoder_t ret;
if (unlikely_log(key->keylen<PSYNC_AES256_KEY_SIZE+PSYNC_AES256_BLOCK_SIZE))
return PSYNC_CRYPTO_INVALID_ENCODER;
enc=psync_ssl_aes256_create_encoder(key);
if (unlikely_log(enc==PSYNC_INVALID_ENCODER))
return PSYNC_CRYPTO_INVALID_ENCODER;
ret=psync_new(psync_crypto_aes256_key_struct_t);
ret->encoder=enc;
memcpy(ret->iv, key->key+PSYNC_AES256_KEY_SIZE, PSYNC_AES256_BLOCK_SIZE);
return ret;
}
void psync_crypto_aes256_ctr_encoder_decoder_free(psync_crypto_aes256_ctr_encoder_decoder_t enc){
psync_ssl_aes256_free_encoder(enc->encoder);
psync_ssl_memclean(enc->iv, PSYNC_AES256_BLOCK_SIZE);
psync_free(enc);
}
void psync_crypto_aes256_ctr_encode_decode_inplace(psync_crypto_aes256_ctr_encoder_decoder_t enc, void *data, size_t datalen, uint64_t dataoffset){
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*3], *aessrc, *aesdst;
uint64_t counter;
size_t blocksrem;
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE;
counter=dataoffset/PSYNC_AES256_BLOCK_SIZE;
memcpy(aessrc+sizeof(uint64_t), enc->iv+sizeof(uint64_t), PSYNC_AES256_BLOCK_SIZE-sizeof(uint64_t));
dataoffset%=PSYNC_AES256_BLOCK_SIZE;
if (dataoffset){
copy_iv_and_xor_with_counter(aessrc, enc->iv, counter);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
blocksrem=PSYNC_AES256_BLOCK_SIZE-dataoffset;
xor_cnt_inplace(data, aesdst+dataoffset, blocksrem);
datalen-=blocksrem;
counter++;
data=(char *)data+blocksrem;
}
blocksrem=datalen/PSYNC_AES256_BLOCK_SIZE;
datalen-=blocksrem*PSYNC_AES256_BLOCK_SIZE;
if (IS_WORD_ALIGNED(data)){
while (blocksrem){
copy_iv_and_xor_with_counter(aessrc, enc->iv, counter);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor16_aligned_inplace(data, aesdst);
blocksrem--;
counter++;
data=(char *)data+PSYNC_AES256_BLOCK_SIZE;
}
}
else{
while (blocksrem){
copy_iv_and_xor_with_counter(aessrc, enc->iv, counter);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor16_unaligned_inplace(data, aesdst);
blocksrem--;
counter++;
data=(char *)data+PSYNC_AES256_BLOCK_SIZE;
}
}
if (datalen){
copy_iv_and_xor_with_counter(aessrc, enc->iv, counter);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor_cnt_inplace(data, aesdst, datalen);
}
}
static void copy_unaligned(unsigned char *dst, const unsigned char *src){
memcpy(dst, src, PSYNC_AES256_BLOCK_SIZE);
}
static void copy_aligned(unsigned char *dst, const unsigned char *src){
if (sizeof(unsigned long)==8){
LONG_DEREF(dst, 0)=LONG_DEREF(src, 0);
LONG_DEREF(dst, 1)=LONG_DEREF(src, 1);
}
else if (sizeof(unsigned long)==4){
LONG_DEREF(dst, 0)=LONG_DEREF(src, 0);
LONG_DEREF(dst, 1)=LONG_DEREF(src, 1);
LONG_DEREF(dst, 2)=LONG_DEREF(src, 2);
LONG_DEREF(dst, 3)=LONG_DEREF(src, 3);
}
else
copy_unaligned(dst, src);
}
static void copy_pad(unsigned char *dst, size_t cnt, const unsigned char **restrict txt, size_t *restrict txtlen){
if (cnt<=*txtlen){
memcpy(dst, *txt, cnt);
*txt+=cnt;
*txtlen-=cnt;
}
else{
memcpy(dst, *txt, *txtlen);
dst+=*txtlen;
memset(dst, 0, cnt-*txtlen);
*txtlen=0;
}
}
void psync_crypto_aes256_encode_text(psync_crypto_aes256_text_encoder_t enc, const unsigned char *txt, size_t txtlen, unsigned char **out, size_t *outlen){
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*3+PSYNC_SHA512_DIGEST_LEN], *aessrc, *aesdst, *outptr, *hmac;
size_t ol;
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE;
hmac=aessrc+PSYNC_AES256_BLOCK_SIZE*2;
ol=ALIGN_A256_BS(txtlen);
outptr=psync_new_cnt(unsigned char, ol);
*out=outptr;
*outlen=ol;
if (txtlen<=PSYNC_AES256_BLOCK_SIZE){
copy_pad(aessrc, PSYNC_AES256_BLOCK_SIZE, &txt, &txtlen);
assert(enc->ivlen>=PSYNC_AES256_BLOCK_SIZE);
xor16_aligned_inplace(aessrc, enc->iv);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
copy_aligned(outptr, aesdst);
return;
}
psync_hmac_sha512(txt+PSYNC_AES256_BLOCK_SIZE, txtlen-PSYNC_AES256_BLOCK_SIZE, enc->iv, enc->ivlen, hmac);
copy_unaligned(aessrc, txt);
txt+=PSYNC_AES256_BLOCK_SIZE;
txtlen-=PSYNC_AES256_BLOCK_SIZE;
xor16_aligned_inplace(aessrc, hmac);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
do {
copy_pad(aessrc, PSYNC_AES256_BLOCK_SIZE, &txt, &txtlen);
xor16_aligned_inplace(aessrc, aesdst);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
} while (txtlen);
}
unsigned char *psync_crypto_aes256_decode_text(psync_crypto_aes256_text_decoder_t enc, const unsigned char *data, size_t datalen){
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*2+PSYNC_SHA512_DIGEST_LEN], *aessrc, *aesdst, *outptr, *ret;
size_t len;
const unsigned char *xorptr;
if (unlikely_log(datalen%PSYNC_AES256_BLOCK_SIZE || !datalen))
return NULL;
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE;
outptr=psync_new_cnt(unsigned char, datalen+1);
ret=outptr;
datalen/=PSYNC_AES256_BLOCK_SIZE;
if (datalen==1){
copy_unaligned(aessrc, data);
psync_aes256_decode_block(enc->encoder, aessrc, aesdst);
assert(enc->ivlen>=PSYNC_AES256_BLOCK_SIZE);
xor16_aligned_inplace(aesdst, enc->iv);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
*outptr=0;
len=strlen((char *)ret)+1;
while (ret+len<outptr){
if (unlikely(ret[len]!=0)){
debug(D_WARNING, "non-zero in the padding found");
psync_free(ret);
return NULL;
}
len++;
}
return ret;
}
if (IS_WORD_ALIGNED(data)){
copy_aligned(aessrc, data);
psync_aes256_decode_block(enc->encoder, aessrc, aesdst);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
while (--datalen){
xorptr=data;
data+=PSYNC_AES256_BLOCK_SIZE;
copy_aligned(aessrc, data);
psync_aes256_decode_block(enc->encoder, aessrc, aesdst);
xor16_aligned_inplace(aesdst, xorptr);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
}
}
else{
copy_unaligned(aessrc, data);
psync_aes256_decode_block(enc->encoder, aessrc, aesdst);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
while (--datalen){
xorptr=data;
data+=PSYNC_AES256_BLOCK_SIZE;
copy_unaligned(aessrc, data);
psync_aes256_decode_block(enc->encoder, aessrc, aesdst);
xor16_unaligned_inplace(aesdst, xorptr);
copy_aligned(outptr, aesdst);
outptr+=PSYNC_AES256_BLOCK_SIZE;
}
}
*outptr=0;
len=strlen((char *)ret+PSYNC_AES256_BLOCK_SIZE);
psync_hmac_sha512(ret+PSYNC_AES256_BLOCK_SIZE, len, enc->iv, enc->ivlen, aessrc);
xor16_aligned_inplace(ret, aessrc);
len+=PSYNC_AES256_BLOCK_SIZE+1;
while (ret+len<outptr){
if (unlikely(ret[len]!=0)){
debug(D_WARNING, "non-zero in the padding found");
psync_free(ret);
return NULL;
}
len++;
}
return ret;
}
psync_crypto_aes256_text_encoder_t psync_crypto_aes256_text_encoder_create(psync_symmetric_key_t key){
psync_aes256_encoder enc;
psync_crypto_aes256_text_encoder_t ret;
if (unlikely_log(key->keylen<PSYNC_AES256_KEY_SIZE+PSYNC_AES256_BLOCK_SIZE))
return PSYNC_CRYPTO_INVALID_ENCODER;
enc=psync_ssl_aes256_create_encoder(key);
if (unlikely_log(enc==PSYNC_INVALID_ENCODER))
return PSYNC_CRYPTO_INVALID_ENCODER;
ret=(psync_crypto_aes256_text_encoder_t)psync_locked_malloc(offsetof(psync_crypto_aes256_key_var_iv_struct_t, iv)+key->keylen-PSYNC_AES256_KEY_SIZE);
ret->encoder=enc;
ret->ivlen=key->keylen-PSYNC_AES256_KEY_SIZE;
memcpy(ret->iv, key->key+PSYNC_AES256_KEY_SIZE, ret->ivlen);
return ret;
}
void psync_crypto_aes256_text_encoder_free(psync_crypto_aes256_text_encoder_t enc){
psync_ssl_aes256_free_encoder(enc->encoder);
psync_ssl_memclean(enc->iv, enc->ivlen);
psync_locked_free(enc);
}
psync_crypto_aes256_text_decoder_t psync_crypto_aes256_text_decoder_create(psync_symmetric_key_t key){
psync_aes256_encoder enc;
psync_crypto_aes256_text_encoder_t ret;
if (unlikely_log(key->keylen<PSYNC_AES256_KEY_SIZE+PSYNC_AES256_BLOCK_SIZE))
return PSYNC_CRYPTO_INVALID_ENCODER;
enc=psync_ssl_aes256_create_decoder(key);
if (unlikely_log(enc==PSYNC_INVALID_ENCODER))
return PSYNC_CRYPTO_INVALID_ENCODER;
ret=(psync_crypto_aes256_text_encoder_t)psync_locked_malloc(offsetof(psync_crypto_aes256_key_var_iv_struct_t, iv)+key->keylen-PSYNC_AES256_KEY_SIZE);
ret->encoder=enc;
ret->ivlen=key->keylen-PSYNC_AES256_KEY_SIZE;
memcpy(ret->iv, key->key+PSYNC_AES256_KEY_SIZE, ret->ivlen);
return ret;
}
void psync_crypto_aes256_text_decoder_free(psync_crypto_aes256_text_decoder_t enc){
psync_ssl_aes256_free_encoder(enc->encoder);
psync_ssl_memclean(enc->iv, enc->ivlen);
psync_locked_free(enc);
}
psync_crypto_aes256_sector_encoder_decoder_t psync_crypto_aes256_sector_encoder_decoder_create(psync_symmetric_key_t key){
psync_aes256_encoder enc;
psync_aes256_decoder dec;
psync_crypto_aes256_sector_encoder_decoder_t ret;
if (unlikely_log(key->keylen<PSYNC_AES256_KEY_SIZE))
return PSYNC_CRYPTO_INVALID_ENCODER;
enc=psync_ssl_aes256_create_encoder(key);
if (unlikely_log(enc==PSYNC_INVALID_ENCODER))
return PSYNC_CRYPTO_INVALID_ENCODER;
dec=psync_ssl_aes256_create_decoder(key);
if (unlikely_log(enc==PSYNC_INVALID_ENCODER)){
psync_ssl_aes256_free_encoder(enc);
return PSYNC_CRYPTO_INVALID_ENCODER;
}
ret=(psync_crypto_aes256_sector_encoder_decoder_t)psync_locked_malloc(offsetof(psync_crypto_aes256_enc_dec_var_iv_struct_t, iv)+key->keylen-PSYNC_AES256_KEY_SIZE);
ret->encoder=enc;
ret->decoder=dec;
ret->ivlen=key->keylen-PSYNC_AES256_KEY_SIZE;
memcpy(ret->iv, key->key+PSYNC_AES256_KEY_SIZE, ret->ivlen);
return ret;
}
void psync_crypto_aes256_sector_encoder_decoder_free(psync_crypto_aes256_sector_encoder_decoder_t enc){
psync_ssl_aes256_free_encoder(enc->encoder);
psync_ssl_aes256_free_decoder(enc->decoder);
psync_ssl_memclean(enc->iv, enc->ivlen);
psync_locked_free(enc);
}
/*static void memcpy_const(unsigned char *dst, const unsigned char *src, uint32_t copycnt, uint32_t constcnt){
uint32_t i, b;
copycnt--;
for (i=0; i<constcnt; i++){
b=(copycnt-i)>>31;
dst[i]=dst[i]*b+(src[i]&(b-1));
}
}*/
static int memcmp_const(const unsigned char *s1, const unsigned char *s2, size_t cnt){
size_t i;
uint32_t r;
r=0;
for (i=0; i<cnt; i++)
r|=s1[i]^s2[i];
return (((r-1)>>8)&1)^1;
}
void psync_crypto_aes256_encode_sector(psync_crypto_aes256_sector_encoder_decoder_t enc, const unsigned char *data, size_t datalen,
unsigned char *out, psync_crypto_sector_auth_t authout, uint64_t sectorid){
psync_hmac_sha512_ctx ctx;
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*3], hmacsha1bin[PSYNC_SHA512_DIGEST_LEN], rnd[PSYNC_AES256_BLOCK_SIZE];
unsigned char *aessrc, *aesdst, *tmp;
uint32_t needsteal;
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE;
assert(PSYNC_CRYPTO_AUTH_SIZE==2*PSYNC_AES256_BLOCK_SIZE);
psync_ssl_rand_weak(rnd, PSYNC_AES256_BLOCK_SIZE);
psync_hmac_sha512_init(&ctx, enc->iv, enc->ivlen);
psync_hmac_sha512_update(&ctx, data, datalen);
psync_hmac_sha512_update(&ctx, &sectorid, sizeof(sectorid));
psync_hmac_sha512_update(&ctx, rnd, PSYNC_AES256_BLOCK_SIZE);
psync_hmac_sha512_final(hmacsha1bin, &ctx);
if (unlikely(datalen<PSYNC_AES256_BLOCK_SIZE)){
memcpy(aessrc, rnd, PSYNC_AES256_BLOCK_SIZE);
xor_cnt_inplace(aessrc, data, datalen);
memcpy(out, rnd, datalen);
memcpy(aesdst, hmacsha1bin, PSYNC_AES256_BLOCK_SIZE);
psync_aes256_encode_2blocks_consec(enc->encoder, aessrc, aessrc);
memcpy(authout, aessrc, PSYNC_AES256_BLOCK_SIZE*2);
return;
}
if (unlikely(datalen%16)){
needsteal=datalen%16;
datalen-=needsteal+PSYNC_AES256_BLOCK_SIZE;
}
else
needsteal=0;
memcpy(aessrc, rnd, PSYNC_AES256_BLOCK_SIZE/2);
memcpy(aessrc+PSYNC_AES256_BLOCK_SIZE/2, hmacsha1bin, PSYNC_AES256_BLOCK_SIZE);
memcpy(aessrc+PSYNC_AES256_BLOCK_SIZE+PSYNC_AES256_BLOCK_SIZE/2, rnd+PSYNC_AES256_BLOCK_SIZE/2, PSYNC_AES256_BLOCK_SIZE/2);
psync_aes256_encode_2blocks_consec(enc->encoder, aessrc, aessrc);
memcpy(authout, aessrc, PSYNC_AES256_BLOCK_SIZE*2);
memcpy(aessrc, hmacsha1bin, PSYNC_AES256_BLOCK_SIZE);
if (IS_WORD_ALIGNED(data) && IS_WORD_ALIGNED(out))
while (datalen){
xor16_aligned_inplace(aessrc, data);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
copy_aligned(out, aesdst);
datalen-=PSYNC_AES256_BLOCK_SIZE;
data+=PSYNC_AES256_BLOCK_SIZE;
out+=PSYNC_AES256_BLOCK_SIZE;
tmp=aessrc;
aessrc=aesdst;
aesdst=tmp;
}
else
while (datalen){
xor16_unaligned_inplace(aessrc, data);
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
copy_unaligned(out, aesdst);
datalen-=PSYNC_AES256_BLOCK_SIZE;
data+=PSYNC_AES256_BLOCK_SIZE;
out+=PSYNC_AES256_BLOCK_SIZE;
tmp=aessrc;
aessrc=aesdst;
aesdst=tmp;
}
if (unlikely(needsteal)){
xor16_unaligned_inplace(aessrc, data);
data+=PSYNC_AES256_BLOCK_SIZE;
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
memcpy(out+PSYNC_AES256_BLOCK_SIZE, aesdst, needsteal);
xor_cnt_inplace(aesdst, data, needsteal);
psync_aes256_encode_block(enc->encoder, aesdst, aessrc);
copy_unaligned(out, aessrc);
}
}
int psync_crypto_aes256_decode_sector(psync_crypto_aes256_sector_encoder_decoder_t enc, const unsigned char *data, size_t datalen,
unsigned char *out, const psync_crypto_sector_auth_t auth, uint64_t sectorid){
psync_hmac_sha512_ctx ctx;
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*15], hmacsha1bin[PSYNC_SHA512_DIGEST_LEN];
unsigned char *aessrc, *aesdst, *aesxor, *hmac, *oout, *tmp;
size_t odatalen;
uint32_t needsteal;
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE*4;
aesxor=aessrc+PSYNC_AES256_BLOCK_SIZE*8;
hmac=aessrc+PSYNC_AES256_BLOCK_SIZE*12;
memcpy(aessrc, auth, PSYNC_AES256_BLOCK_SIZE*2);
psync_aes256_decode_2blocks_consec(enc->decoder, aessrc, hmac);
oout=out;
odatalen=datalen;
if (unlikely(datalen<PSYNC_AES256_BLOCK_SIZE)){
xor_cnt_inplace(hmac, data, datalen);
memcpy(aessrc, data, datalen);
memcpy(out, hmac, datalen);
memcpy(hmac, aessrc, datalen);
}
else{
if (unlikely(datalen%16)){
needsteal=datalen%16;
datalen-=needsteal+PSYNC_AES256_BLOCK_SIZE;
}
else
needsteal=0;
memcpy(aesxor, hmac+PSYNC_AES256_BLOCK_SIZE/2, PSYNC_AES256_BLOCK_SIZE);
memcpy(hmac+PSYNC_AES256_BLOCK_SIZE/2, hmac+PSYNC_AES256_BLOCK_SIZE+PSYNC_AES256_BLOCK_SIZE/2, PSYNC_AES256_BLOCK_SIZE/2);
memcpy(hmac+PSYNC_AES256_BLOCK_SIZE, aesxor, PSYNC_AES256_BLOCK_SIZE);
while (datalen>=PSYNC_AES256_BLOCK_SIZE*4){
memcpy(aessrc, data, PSYNC_AES256_BLOCK_SIZE*4);
memcpy(aesxor+PSYNC_AES256_BLOCK_SIZE, aessrc, PSYNC_AES256_BLOCK_SIZE*3);
psync_aes256_decode_4blocks_consec_xor(enc->decoder, aessrc, aesdst, aesxor);
memcpy(out, aesdst, PSYNC_AES256_BLOCK_SIZE*4);
memcpy(aesxor, aessrc+PSYNC_AES256_BLOCK_SIZE*3, PSYNC_AES256_BLOCK_SIZE);
datalen-=PSYNC_AES256_BLOCK_SIZE*4;
data+=PSYNC_AES256_BLOCK_SIZE*4;
out+=PSYNC_AES256_BLOCK_SIZE*4;
}
while (datalen){
copy_unaligned(aessrc, data);
psync_aes256_decode_block(enc->decoder, aessrc, aesdst);
xor16_aligned_inplace(aesdst, aesxor);
copy_unaligned(out, aesdst);
data+=PSYNC_AES256_BLOCK_SIZE;
out+=PSYNC_AES256_BLOCK_SIZE;
datalen-=PSYNC_AES256_BLOCK_SIZE;
tmp=aesxor;
aesxor=aessrc;
aessrc=tmp;
}
if (unlikely(needsteal)){
copy_unaligned(aessrc, data);
psync_aes256_decode_block(enc->decoder, aessrc, aesdst);
xor_cnt_inplace(aesdst, data+PSYNC_AES256_BLOCK_SIZE, needsteal);
// can be done with less memcpy's, but this version supports inline decoding (e.g. data==out)
memcpy(aessrc, data+PSYNC_AES256_BLOCK_SIZE, needsteal);
memcpy(out+PSYNC_AES256_BLOCK_SIZE, aesdst, needsteal);
memcpy(aesdst, aessrc, needsteal);
psync_aes256_decode_block(enc->decoder, aesdst, aessrc);
xor16_aligned_inplace(aessrc, aesxor);
copy_unaligned(out, aessrc);
}
}
psync_hmac_sha512_init(&ctx, enc->iv, enc->ivlen);
psync_hmac_sha512_update(&ctx, oout, odatalen);
psync_hmac_sha512_update(&ctx, &sectorid, sizeof(sectorid));
psync_hmac_sha512_update(&ctx, hmac, PSYNC_AES256_BLOCK_SIZE);
psync_hmac_sha512_final(hmacsha1bin, &ctx);
return -memcmp_const(hmacsha1bin, hmac+PSYNC_AES256_BLOCK_SIZE, PSYNC_AES256_BLOCK_SIZE);
}
/* the following is CTR based implementation of encode/decode sector
static uint32_t psync_crypto_get_time_32(){
struct timespec tm;
psync_nanotime(&tm);
return ((tm.tv_sec&0xfffffff)<<4)+tm.tv_nsec/((999999999+15)/16);
}
void psync_crypto_aes256_encode_sector(psync_crypto_aes256_sector_encoder_decoder_t enc, const unsigned char *data, size_t datalen,
unsigned char *out, psync_crypto_sector_auth_t authout, uint64_t sectorid){
psync_hmac_sha512_ctx ctx;
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*3], hmacsha1bin[PSYNC_SHA512_DIGEST_LEN];
unsigned char *aessrc, *aesdst;
uint64_t *ctr;
uint32_t u32time;
u32time=psync_crypto_get_time_32();
psync_hmac_sha512_init(&ctx, enc->iv, enc->ivlen);
psync_hmac_sha512_update(&ctx, data, datalen);
psync_hmac_sha512_update(&ctx, &sectorid, sizeof(sectorid));
psync_hmac_sha512_update(&ctx, &u32time, sizeof(uint32_t));
psync_hmac_sha512_final(hmacsha1bin, &ctx);
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE;
memcpy(aessrc+sizeof(uint32_t), hmacsha1bin, PSYNC_AES256_BLOCK_SIZE-sizeof(uint32_t));
memcpy(aessrc, &u32time, sizeof(uint32_t));
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
memcpy(authout, aesdst, PSYNC_AES256_BLOCK_SIZE);
/-* Now this is slightly complicated. AES is used in CTR mode here, Sectors are by design 4096 bytes, so 256 AES blocks.
* What we give to the AES as input is: 88 bits from the data hmac, one of those bits inverted, so there is no chance
* that the rest of the bits get to be the same as the hmac+time in which case we could end up xor-ing plaintext with
* the same value as authout. 32 more bits are reserved for sectorid and 8 bits for counter inside the sector. Effectively
* this means that every AES block will be xor-ed with different value within the first 16Tb of the file (which will be too
* big for quite some time, 16Tb=2^40*AES_BLOCK_SIZE).
*-/
ctr=(uint64_t *)aessrc;
*ctr=(((*ctr)&0xffffff0000000000ULL)+((sectorid&0xffffffffUL)<<8))^0x10000000000ULL;
if (IS_WORD_ALIGNED(data) && IS_WORD_ALIGNED(out)){
while (datalen>=PSYNC_AES256_BLOCK_SIZE){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
(*ctr)++;
xor16_aligned_inplace(aesdst, data);
data+=PSYNC_AES256_BLOCK_SIZE;
datalen-=PSYNC_AES256_BLOCK_SIZE;
copy_aligned(out, aesdst);
out+=PSYNC_AES256_BLOCK_SIZE;
}
if (datalen){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor_cnt_inplace(aesdst, data, datalen);
memcpy(out, aesdst, datalen);
}
}
else{
while (datalen>=PSYNC_AES256_BLOCK_SIZE){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
(*ctr)++;
xor16_unaligned_inplace(aesdst, data);
data+=PSYNC_AES256_BLOCK_SIZE;
datalen-=PSYNC_AES256_BLOCK_SIZE;
copy_unaligned(out, aesdst);
out+=PSYNC_AES256_BLOCK_SIZE;
}
if (datalen){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor_cnt_inplace(aesdst, data, datalen);
memcpy(out, aesdst, datalen);
}
}
}
int psync_crypto_aes256_decode_sector(psync_crypto_aes256_sector_encoder_decoder_t enc, const unsigned char *data, size_t datalen,
unsigned char *out, const psync_crypto_sector_auth_t auth, uint64_t sectorid){
psync_hmac_sha512_ctx ctx;
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*4], hmacsha1bin[PSYNC_SHA512_DIGEST_LEN];
unsigned char *aessrc, *aesdst, *hmac, *oout;
uint64_t *ctr;
size_t odatalen;
aessrc=ALIGN_PTR_A256_BS(buff);
aesdst=aessrc+PSYNC_AES256_BLOCK_SIZE;
hmac=aessrc+PSYNC_AES256_BLOCK_SIZE*2;
memcpy(aessrc, auth, PSYNC_AES256_BLOCK_SIZE);
psync_aes256_decode_block(enc->decoder, aessrc, hmac);
oout=out;
odatalen=datalen;
memcpy(aessrc, hmac, PSYNC_AES256_BLOCK_SIZE);
ctr=(uint64_t *)aessrc;
*ctr=(((*ctr)&0xffffff0000000000ULL)+((sectorid&0xffffffffUL)<<8))^0x10000000000ULL;
if (IS_WORD_ALIGNED(data) && IS_WORD_ALIGNED(out)){
while (datalen>=PSYNC_AES256_BLOCK_SIZE){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
(*ctr)++;
xor16_aligned_inplace(aesdst, data);
data+=PSYNC_AES256_BLOCK_SIZE;
datalen-=PSYNC_AES256_BLOCK_SIZE;
copy_aligned(out, aesdst);
out+=PSYNC_AES256_BLOCK_SIZE;
}
if (datalen){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor_cnt_inplace(aesdst, data, datalen);
memcpy(out, aesdst, datalen);
}
}
else{
while (datalen>=PSYNC_AES256_BLOCK_SIZE){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
(*ctr)++;
xor16_unaligned_inplace(aesdst, data);
data+=PSYNC_AES256_BLOCK_SIZE;
datalen-=PSYNC_AES256_BLOCK_SIZE;
copy_unaligned(out, aesdst);
out+=PSYNC_AES256_BLOCK_SIZE;
}
if (datalen){
psync_aes256_encode_block(enc->encoder, aessrc, aesdst);
xor_cnt_inplace(aesdst, data, datalen);
memcpy(out, aesdst, datalen);
}
}
psync_hmac_sha512_init(&ctx, enc->iv, enc->ivlen);
psync_hmac_sha512_update(&ctx, oout, odatalen);
psync_hmac_sha512_update(&ctx, &sectorid, sizeof(sectorid));
psync_hmac_sha512_update(&ctx, hmac, sizeof(uint32_t));
psync_hmac_sha512_final(hmacsha1bin, &ctx);
return -memcmp_const(hmacsha1bin, hmac+sizeof(uint32_t), PSYNC_AES256_BLOCK_SIZE-sizeof(uint32_t));
}
*/
void psync_crypto_sign_auth_sector(psync_crypto_aes256_sector_encoder_decoder_t enc, const unsigned char *data, size_t datalen, psync_crypto_sector_auth_t authout){
unsigned char buff[PSYNC_AES256_BLOCK_SIZE*3+PSYNC_SHA512_DIGEST_LEN];
unsigned char *aessrc, *aesdst;
aesdst=ALIGN_PTR_A256_BS(buff);
aessrc=aesdst+PSYNC_AES256_BLOCK_SIZE*2;
psync_hmac_sha512(data, datalen, enc->iv, enc->ivlen, aessrc);
psync_aes256_encode_2blocks_consec(enc->encoder, aessrc, aesdst);
memcpy(authout, aesdst, PSYNC_AES256_BLOCK_SIZE*2);
}
Reference in New Issue View Git Blame Copy Permalink