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aes: whitespace cosmetics 

Signed-off-by: Mans Rullgard <mans@mansr.com>
tags/n0.9
Mans Rullgard 14 years ago
parent
bd55da1c08
commit
4bfe064460
1 changed files with 132 additions and 87 deletions
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  1. +132
    -87
      libavutil/aes.c

+ 132
- 87
libavutil/aes.c View File

@@ -30,13 +30,13 @@ typedef union {
uint8_t u8[16];
} av_aes_block;

typedef struct AVAES{
typedef struct AVAES {
// Note: round_key[16] is accessed in the init code, but this only
// overwrites state, which does not matter (see also r7471).
av_aes_block round_key[15];
av_aes_block state[2];
int rounds;
}AVAES;
} AVAES;

const int av_aes_size= sizeof(AVAES);

@@ -54,18 +54,34 @@ static uint32_t enc_multbl[4][256];
static uint32_t dec_multbl[4][256];
#endif

static inline void addkey(av_aes_block *dst, const av_aes_block *src, const av_aes_block *round_key){
static inline void addkey(av_aes_block *dst, const av_aes_block *src,
const av_aes_block *round_key)
{
dst->u64[0] = src->u64[0] ^ round_key->u64[0];
dst->u64[1] = src->u64[1] ^ round_key->u64[1];
}

static void subshift(av_aes_block s0[2], int s, const uint8_t *box){
av_aes_block *s1= (av_aes_block *)(s0[0].u8 - s);
av_aes_block *s3= (av_aes_block *)(s0[0].u8 + s);
s0[0].u8[0]=box[s0[1].u8[ 0]]; s0[0].u8[ 4]=box[s0[1].u8[ 4]]; s0[0].u8[ 8]=box[s0[1].u8[ 8]]; s0[0].u8[12]=box[s0[1].u8[12]];
s1[0].u8[3]=box[s1[1].u8[ 7]]; s1[0].u8[ 7]=box[s1[1].u8[11]]; s1[0].u8[11]=box[s1[1].u8[15]]; s1[0].u8[15]=box[s1[1].u8[ 3]];
s0[0].u8[2]=box[s0[1].u8[10]]; s0[0].u8[10]=box[s0[1].u8[ 2]]; s0[0].u8[ 6]=box[s0[1].u8[14]]; s0[0].u8[14]=box[s0[1].u8[ 6]];
s3[0].u8[1]=box[s3[1].u8[13]]; s3[0].u8[13]=box[s3[1].u8[ 9]]; s3[0].u8[ 9]=box[s3[1].u8[ 5]]; s3[0].u8[ 5]=box[s3[1].u8[ 1]];
static void subshift(av_aes_block s0[2], int s, const uint8_t *box)
{
av_aes_block *s1 = (av_aes_block *) (s0[0].u8 - s);
av_aes_block *s3 = (av_aes_block *) (s0[0].u8 + s);

s0[0].u8[ 0] = box[s0[1].u8[ 0]];
s0[0].u8[ 4] = box[s0[1].u8[ 4]];
s0[0].u8[ 8] = box[s0[1].u8[ 8]];
s0[0].u8[12] = box[s0[1].u8[12]];
s1[0].u8[ 3] = box[s1[1].u8[ 7]];
s1[0].u8[ 7] = box[s1[1].u8[11]];
s1[0].u8[11] = box[s1[1].u8[15]];
s1[0].u8[15] = box[s1[1].u8[ 3]];
s0[0].u8[ 2] = box[s0[1].u8[10]];
s0[0].u8[10] = box[s0[1].u8[ 2]];
s0[0].u8[ 6] = box[s0[1].u8[14]];
s0[0].u8[14] = box[s0[1].u8[ 6]];
s3[0].u8[ 1] = box[s3[1].u8[13]];
s3[0].u8[13] = box[s3[1].u8[ 9]];
s3[0].u8[ 9] = box[s3[1].u8[ 5]];
s3[0].u8[ 5] = box[s3[1].u8[ 1]];
}

static inline int mix_core(uint32_t multbl[][256], int a, int b, int c, int d){
@@ -85,116 +101,134 @@ static inline void mix(av_aes_block state[2], uint32_t multbl[][256], int s1, in
state[0].u32[3] = mix_core(multbl, src[3][0], src[s1-1][1], src[1][2], src[s3-1][3]);
}

static inline void crypt(AVAES *a, int s, const uint8_t *sbox, uint32_t multbl[][256]){
static inline void crypt(AVAES *a, int s, const uint8_t *sbox,
uint32_t multbl[][256])
{
int r;

for(r=a->rounds-1; r>0; r--){
mix(a->state, multbl, 3-s, 1+s);
for (r = a->rounds - 1; r > 0; r--) {
mix(a->state, multbl, 3 - s, 1 + s);
addkey(&a->state[1], &a->state[0], &a->round_key[r]);
}

subshift(&a->state[0], s, sbox);
}

void av_aes_crypt(AVAES *a, uint8_t *dst_, const uint8_t *src_, int count, uint8_t *iv_, int decrypt){
av_aes_block *dst = (av_aes_block *)dst_;
const av_aes_block *src = (const av_aes_block *)src_;
av_aes_block *iv = (av_aes_block *)iv_;
while(count--){
void av_aes_crypt(AVAES *a, uint8_t *dst_, const uint8_t *src_,
int count, uint8_t *iv_, int decrypt)
{
av_aes_block *dst = (av_aes_block *) dst_;
const av_aes_block *src = (const av_aes_block *) src_;
av_aes_block *iv = (av_aes_block *) iv_;

while (count--) {
addkey(&a->state[1], src, &a->round_key[a->rounds]);
if(decrypt) {
if (decrypt) {
crypt(a, 0, inv_sbox, dec_multbl);
if(iv){
if (iv) {
addkey(&a->state[0], &a->state[0], iv);
memcpy(iv, src, 16);
}
addkey(dst, &a->state[0], &a->round_key[0]);
}else{
if(iv) addkey(&a->state[1], &a->state[1], iv);
crypt(a, 2, sbox, enc_multbl);
} else {
if (iv)
addkey(&a->state[1], &a->state[1], iv);
crypt(a, 2, sbox, enc_multbl);
addkey(dst, &a->state[0], &a->round_key[0]);
if(iv) memcpy(iv, dst, 16);
if (iv)
memcpy(iv, dst, 16);
}
src++;
dst++;
}
}

static void init_multbl2(uint8_t tbl[1024], const int c[4], const uint8_t *log8, const uint8_t *alog8, const uint8_t *sbox){
static void init_multbl2(uint8_t tbl[1024], const int c[4],
const uint8_t *log8, const uint8_t *alog8,
const uint8_t *sbox)
{
int i, j;
for(i=0; i<1024; i++){
int x= sbox[i>>2];
if(x) tbl[i]= alog8[ log8[x] + log8[c[i&3]] ];

for (i = 0; i < 1024; i++) {
int x = sbox[i >> 2];
if (x)
tbl[i] = alog8[log8[x] + log8[c[i & 3]]];
}
#if !CONFIG_SMALL
for(j=256; j<1024; j++)
for(i=0; i<4; i++)
tbl[4*j+i]= tbl[4*j + ((i-1)&3) - 1024];
for (j = 256; j < 1024; j++)
for (i = 0; i < 4; i++)
tbl[4*j + i] = tbl[4*j + ((i - 1) & 3) - 1024];
#endif
}

// this is based on the reference AES code by Paulo Barreto and Vincent Rijmen
int av_aes_init(AVAES *a, const uint8_t *key, int key_bits, int decrypt) {
int av_aes_init(AVAES *a, const uint8_t *key, int key_bits, int decrypt)
{
int i, j, t, rconpointer = 0;
uint8_t tk[8][4];
int KC= key_bits>>5;
int rounds= KC + 6;
uint8_t log8[256];
int KC = key_bits >> 5;
int rounds = KC + 6;
uint8_t log8[256];
uint8_t alog8[512];

if(!enc_multbl[FF_ARRAY_ELEMS(enc_multbl)-1][FF_ARRAY_ELEMS(enc_multbl[0])-1]){
j=1;
for(i=0; i<255; i++){
alog8[i]=
alog8[i+255]= j;
log8[j]= i;
j^= j+j;
if(j>255) j^= 0x11B;
if (!enc_multbl[FF_ARRAY_ELEMS(enc_multbl)-1][FF_ARRAY_ELEMS(enc_multbl[0])-1]) {
j = 1;
for (i = 0; i < 255; i++) {
alog8[i] = alog8[i + 255] = j;
log8[j] = i;
j ^= j + j;
if (j > 255)
j ^= 0x11B;
}
for(i=0; i<256; i++){
j= i ? alog8[255-log8[i]] : 0;
j ^= (j<<1) ^ (j<<2) ^ (j<<3) ^ (j<<4);
j = (j ^ (j>>8) ^ 99) & 255;
inv_sbox[j]= i;
sbox [i]= j;
for (i = 0; i < 256; i++) {
j = i ? alog8[255 - log8[i]] : 0;
j ^= (j << 1) ^ (j << 2) ^ (j << 3) ^ (j << 4);
j = (j ^ (j >> 8) ^ 99) & 255;
inv_sbox[j] = i;
sbox[i] = j;
}
init_multbl2(dec_multbl[0], (const int[4]){0xe, 0x9, 0xd, 0xb}, log8, alog8, inv_sbox);
init_multbl2(enc_multbl[0], (const int[4]){0x2, 0x1, 0x1, 0x3}, log8, alog8, sbox);
init_multbl2(dec_multbl[0], (const int[4]) { 0xe, 0x9, 0xd, 0xb },
log8, alog8, inv_sbox);
init_multbl2(enc_multbl[0], (const int[4]) { 0x2, 0x1, 0x1, 0x3 },
log8, alog8, sbox);
}

if(key_bits!=128 && key_bits!=192 && key_bits!=256)
if (key_bits != 128 && key_bits != 192 && key_bits != 256)
return -1;

a->rounds= rounds;
a->rounds = rounds;

memcpy(tk, key, KC*4);
memcpy(tk, key, KC * 4);

for(t= 0; t < (rounds+1)*16;) {
memcpy(a->round_key[0].u8+t, tk, KC*4);
t+= KC*4;
for (t = 0; t < (rounds + 1) * 16;) {
memcpy(a->round_key[0].u8 + t, tk, KC * 4);
t += KC * 4;

for(i = 0; i < 4; i++)
tk[0][i] ^= sbox[tk[KC-1][(i+1)&3]];
for (i = 0; i < 4; i++)
tk[0][i] ^= sbox[tk[KC - 1][(i + 1) & 3]];
tk[0][0] ^= rcon[rconpointer++];

for(j = 1; j < KC; j++){
if(KC != 8 || j != KC>>1)
for(i = 0; i < 4; i++) tk[j][i] ^= tk[j-1][i];
for (j = 1; j < KC; j++) {
if (KC != 8 || j != KC >> 1)
for (i = 0; i < 4; i++)
tk[j][i] ^= tk[j - 1][i];
else
for(i = 0; i < 4; i++) tk[j][i] ^= sbox[tk[j-1][i]];
for (i = 0; i < 4; i++)
tk[j][i] ^= sbox[tk[j - 1][i]];
}
}

if(decrypt){
for(i=1; i<rounds; i++){
if (decrypt) {
for (i = 1; i < rounds; i++) {
av_aes_block tmp[3];
memcpy(&tmp[2], &a->round_key[i], 16);
subshift(&tmp[1], 0, sbox);
mix(tmp, dec_multbl, 1, 3);
memcpy(&a->round_key[i], &tmp[0], 16);
}
}else{
for(i=0; i<(rounds+1)>>1; i++){
for(j=0; j<16; j++)
} else {
for (i = 0; i < (rounds + 1) >> 1; i++) {
for (j = 0; j < 16; j++)
FFSWAP(int, a->round_key[i].u8[j], a->round_key[rounds-i].u8[j]);
}
}
@@ -209,30 +243,39 @@ int av_aes_init(AVAES *a, const uint8_t *key, int key_bits, int decrypt) {

int main(int argc, char **argv)
{
int i,j;
int i, j;
AVAES b;
uint8_t rkey[2][16]= {
{0},
{0x10, 0xa5, 0x88, 0x69, 0xd7, 0x4b, 0xe5, 0xa3, 0x74, 0xcf, 0x86, 0x7c, 0xfb, 0x47, 0x38, 0x59}};
uint8_t rkey[2][16] = {
{ 0 },
{ 0x10, 0xa5, 0x88, 0x69, 0xd7, 0x4b, 0xe5, 0xa3,
0x74, 0xcf, 0x86, 0x7c, 0xfb, 0x47, 0x38, 0x59 }
};
uint8_t pt[16], rpt[2][16]= {
{0x6a, 0x84, 0x86, 0x7c, 0xd7, 0x7e, 0x12, 0xad, 0x07, 0xea, 0x1b, 0xe8, 0x95, 0xc5, 0x3f, 0xa3},
{0}};
{ 0x6a, 0x84, 0x86, 0x7c, 0xd7, 0x7e, 0x12, 0xad,
0x07, 0xea, 0x1b, 0xe8, 0x95, 0xc5, 0x3f, 0xa3 },
{ 0 }
};
uint8_t rct[2][16]= {
{0x73, 0x22, 0x81, 0xc0, 0xa0, 0xaa, 0xb8, 0xf7, 0xa5, 0x4a, 0x0c, 0x67, 0xa0, 0xc4, 0x5e, 0xcf},
{0x6d, 0x25, 0x1e, 0x69, 0x44, 0xb0, 0x51, 0xe0, 0x4e, 0xaa, 0x6f, 0xb4, 0xdb, 0xf7, 0x84, 0x65}};
{ 0x73, 0x22, 0x81, 0xc0, 0xa0, 0xaa, 0xb8, 0xf7,
0xa5, 0x4a, 0x0c, 0x67, 0xa0, 0xc4, 0x5e, 0xcf },
{ 0x6d, 0x25, 0x1e, 0x69, 0x44, 0xb0, 0x51, 0xe0,
0x4e, 0xaa, 0x6f, 0xb4, 0xdb, 0xf7, 0x84, 0x65 }
};
uint8_t temp[16];
int err = 0;

av_log_set_level(AV_LOG_DEBUG);

for(i=0; i<2; i++){
for (i = 0; i < 2; i++) {
av_aes_init(&b, rkey[i], 128, 1);
av_aes_crypt(&b, temp, rct[i], 1, NULL, 1);
for(j=0; j<16; j++)
if(rpt[i][j] != temp[j]) {
av_log(NULL, AV_LOG_ERROR, "%d %02X %02X\n", j, rpt[i][j], temp[j]);
for (j = 0; j < 16; j++) {
if (rpt[i][j] != temp[j]) {
av_log(NULL, AV_LOG_ERROR, "%d %02X %02X\n",
j, rpt[i][j], temp[j]);
err = 1;
}
}
}

if (argc > 1 && !strcmp(argv[1], "-t")) {
@@ -243,21 +286,23 @@ int main(int argc, char **argv)
av_aes_init(&ad, "PI=3.141592654..", 128, 1);
av_lfg_init(&prng, 1);

for(i=0; i<10000; i++){
for(j=0; j<16; j++){
for (i = 0; i < 10000; i++) {
for (j = 0; j < 16; j++) {
pt[j] = av_lfg_get(&prng);
}
{
START_TIMER;
av_aes_crypt(&ae, temp, pt, 1, NULL, 0);
if(!(i&(i-1)))
av_log(NULL, AV_LOG_ERROR, "%02X %02X %02X %02X\n", temp[0], temp[5], temp[10], temp[15]);
if (!(i & (i - 1)))
av_log(NULL, AV_LOG_ERROR, "%02X %02X %02X %02X\n",
temp[0], temp[5], temp[10], temp[15]);
av_aes_crypt(&ad, temp, temp, 1, NULL, 1);
STOP_TIMER("aes");
}
for(j=0; j<16; j++){
if(pt[j] != temp[j]){
av_log(NULL, AV_LOG_ERROR, "%d %d %02X %02X\n", i,j, pt[j], temp[j]);
for (j = 0; j < 16; j++) {
if (pt[j] != temp[j]) {
av_log(NULL, AV_LOG_ERROR, "%d %d %02X %02X\n",
i, j, pt[j], temp[j]);
}
}
}


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