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avr-crypto-lib
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reduced size of small JH

This commit is contained in:
bg 2010-12-17 01:26:41 +00:00
parent e2a5b47463
commit d7838aec00
1 changed files with 12 additions and 14 deletions
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26
jh/jh_simple_small_core.c
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@ -103,24 +103,21 @@ void jh_next_round_const(uint8_t* a){
}
}
static const uint8_t idx[]={112,80,48,16,96,64,32,0};
static inline
void group(uint8_t *a){
uint8_t b[128];
uint8_t i,x,y;
uint8_t i,j,k,x;
for(i=0; i<128; ++i){
x = (((a[i/8+ 0])>>4)&0x8)
| (((a[i/8+ 32])>>5)&0x4)
| (((a[i/8+ 64])>>6)&0x2)
| (((a[i/8+ 96])>>7)&0x1);
a[i/8] <<= 1; a[i/8+32]<<=1; a[i/8+64]<<=1; a[i/8+96]<<=1;
y = (((a[i/8+ 16])>>4)&0x8)
| (((a[i/8+ 48])>>5)&0x4)
| (((a[i/8+ 80])>>6)&0x2)
| (((a[i/8+112])>>7)&0x1);
a[i/8+16] <<= 1; a[i/8+48]<<=1; a[i/8+80]<<=1; a[i/8+112]<<=1;
b[i]= (x<<4)|y;
j=i/8;
for(k=0;k<8;++k){
x>>=1;
x |= a[j+idx[k]]&0x80;
a[j+idx[k]] <<= 1;
}
b[i]= x;
}
memcpy(a,b,128);
}
@ -128,13 +125,14 @@ void group(uint8_t *a){
static inline
void degroup(uint8_t *a){
uint8_t b[128];
static uint8_t idx[]={112,80,48,16,96,64,32,0};
uint8_t i,j,k,t;
for(i=0;i<128;++i){
j=i/8;
t = a[i];
for(k=0; k<8; ++k){
b[j+idx[k]]<<=1; b[j+idx[k]] |= t&1; t>>=1;
b[j+idx[k]]<<=1;
b[j+idx[k]] |= t&1;
t>>=1;
}
}
memcpy(a,b,128);