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SEED to support OPENSSL_SMALL_FOOTPRINT: ~2x size decrease on x86.

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This commit is contained in:
Andy Polyakov 2008-12-16 07:41:21 +00:00
parent 3ebbe8853f
commit f826bf7798
1 changed files with 41 additions and 2 deletions
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43
crypto/seed/seed.c
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@ -187,6 +187,11 @@ static const seed_word SS[4][256] = { {
#define KC14 0xde6e678d
#define KC15 0xbcdccf1b
#if defined(OPENSSL_SMALL_FOOTPRINT)
static const seed_word KC[] = {
KC0, KC1, KC2, KC3, KC4, KC5, KC6, KC7,
KC8, KC9, KC10, KC11, KC12, KC13, KC14, KC15 };
#endif
void SEED_set_key(const unsigned char rawkey[SEED_KEY_LENGTH], SEED_KEY_SCHEDULE *ks)
{
@ -201,6 +206,8 @@ void SEED_set_key(const unsigned char rawkey[SEED_KEY_LENGTH], SEED_KEY_SCHEDULE
t0 = (x1 + x3 - KC0) & 0xffffffff;
t1 = (x2 - x4 + KC0) & 0xffffffff; KEYUPDATE_TEMP(t0, t1, &ks->data[0]);
KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC1); KEYUPDATE_TEMP(t0, t1, &ks->data[2]);
#if !defined(OPENSSL_SMALL_FOOTPRINT)
KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC2); KEYUPDATE_TEMP(t0, t1, &ks->data[4]);
KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC3); KEYUPDATE_TEMP(t0, t1, &ks->data[6]);
KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC4); KEYUPDATE_TEMP(t0, t1, &ks->data[8]);
@ -215,6 +222,17 @@ void SEED_set_key(const unsigned char rawkey[SEED_KEY_LENGTH], SEED_KEY_SCHEDULE
KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC13); KEYUPDATE_TEMP(t0, t1, &ks->data[26]);
KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC14); KEYUPDATE_TEMP(t0, t1, &ks->data[28]);
KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC15); KEYUPDATE_TEMP(t0, t1, &ks->data[30]);
#else
{
int i;
for (i=2; i<16; i+=2) {
KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC[i]);
KEYUPDATE_TEMP(t0, t1, &ks->data[i*2]);
KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC[i+1]);
KEYUPDATE_TEMP(t0, t1, &ks->data[i*2+2]);
}
}
#endif
}
void SEED_encrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_BLOCK_SIZE], const SEED_KEY_SCHEDULE *ks)
@ -226,7 +244,8 @@ void SEED_encrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
char2word(s+4, x2);
char2word(s+8, x3);
char2word(s+12, x4);
#if !defined(OPENSSL_SMALL_FOOTPRINT)
E_SEED(t0, t1, x1, x2, x3, x4, 0);
E_SEED(t0, t1, x3, x4, x1, x2, 2);
E_SEED(t0, t1, x1, x2, x3, x4, 4);
@ -243,6 +262,15 @@ void SEED_encrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
E_SEED(t0, t1, x3, x4, x1, x2, 26);
E_SEED(t0, t1, x1, x2, x3, x4, 28);
E_SEED(t0, t1, x3, x4, x1, x2, 30);
#else
{
int i;
for (i=0;i<30;i+=4) {
E_SEED(t0,t1,x1,x2,x3,x4,i);
E_SEED(t0,t1,x3,x4,x1,x2,i+2);
}
}
#endif
word2char(x3, d);
word2char(x4, d+4);
@ -259,7 +287,8 @@ void SEED_decrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
char2word(s+4, x2);
char2word(s+8, x3);
char2word(s+12, x4);
#if !defined(OPENSSL_SMALL_FOOTPRINT)
E_SEED(t0, t1, x1, x2, x3, x4, 30);
E_SEED(t0, t1, x3, x4, x1, x2, 28);
E_SEED(t0, t1, x1, x2, x3, x4, 26);
@ -276,6 +305,16 @@ void SEED_decrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
E_SEED(t0, t1, x3, x4, x1, x2, 4);
E_SEED(t0, t1, x1, x2, x3, x4, 2);
E_SEED(t0, t1, x3, x4, x1, x2, 0);
#else
{
int i;
for (i=30; i>0; i-=4) {
E_SEED(t0, t1, x1, x2, x3, x4, i);
E_SEED(t0, t1, x3, x4, x1, x2, i-2);
}
}
#endif
word2char(x3, d);
word2char(x4, d+4);