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/*
version 20080912
D. J. Bernstein
Public domain.
*/
#include "api.h"
#define ROUNDS 20
typedef unsigned int uint32;
static uint32 rotate(uint32 u,int c)
{
return (u << c) | (u >> (32 - c));
}
static uint32 load_littleendian(const unsigned char *x)
{
return
(uint32) (x[0]) \
| (((uint32) (x[1])) << 8) \
| (((uint32) (x[2])) << 16) \
| (((uint32) (x[3])) << 24)
;
}
static void store_littleendian(unsigned char *x,uint32 u)
{
x[0] = u; u >>= 8;
x[1] = u; u >>= 8;
x[2] = u; u >>= 8;
x[3] = u;
}
int crypto_core(
unsigned char *out,
const unsigned char *in,
const unsigned char *k,
const unsigned char *c
)
{
uint32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
uint32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
int i;
j0 = x0 = load_littleendian(c + 0);
j1 = x1 = load_littleendian(k + 0);
j2 = x2 = load_littleendian(k + 4);
j3 = x3 = load_littleendian(k + 8);
j4 = x4 = load_littleendian(k + 12);
j5 = x5 = load_littleendian(c + 4);
j6 = x6 = load_littleendian(in + 0);
j7 = x7 = load_littleendian(in + 4);
j8 = x8 = load_littleendian(in + 8);
j9 = x9 = load_littleendian(in + 12);
j10 = x10 = load_littleendian(c + 8);
j11 = x11 = load_littleendian(k + 16);
j12 = x12 = load_littleendian(k + 20);
j13 = x13 = load_littleendian(k + 24);
j14 = x14 = load_littleendian(k + 28);
j15 = x15 = load_littleendian(c + 12);
for (i = ROUNDS;i > 0;i -= 2) {
x4 ^= rotate( x0+x12, 7);
x8 ^= rotate( x4+ x0, 9);
x12 ^= rotate( x8+ x4,13);
x0 ^= rotate(x12+ x8,18);
x9 ^= rotate( x5+ x1, 7);
x13 ^= rotate( x9+ x5, 9);
x1 ^= rotate(x13+ x9,13);
x5 ^= rotate( x1+x13,18);
x14 ^= rotate(x10+ x6, 7);
x2 ^= rotate(x14+x10, 9);
x6 ^= rotate( x2+x14,13);
x10 ^= rotate( x6+ x2,18);
x3 ^= rotate(x15+x11, 7);
x7 ^= rotate( x3+x15, 9);
x11 ^= rotate( x7+ x3,13);
x15 ^= rotate(x11+ x7,18);
x1 ^= rotate( x0+ x3, 7);
x2 ^= rotate( x1+ x0, 9);
x3 ^= rotate( x2+ x1,13);
x0 ^= rotate( x3+ x2,18);
x6 ^= rotate( x5+ x4, 7);
x7 ^= rotate( x6+ x5, 9);
x4 ^= rotate( x7+ x6,13);
x5 ^= rotate( x4+ x7,18);
x11 ^= rotate(x10+ x9, 7);
x8 ^= rotate(x11+x10, 9);
x9 ^= rotate( x8+x11,13);
x10 ^= rotate( x9+ x8,18);
x12 ^= rotate(x15+x14, 7);
x13 ^= rotate(x12+x15, 9);
x14 ^= rotate(x13+x12,13);
x15 ^= rotate(x14+x13,18);
}
x0 += j0;
x1 += j1;
x2 += j2;
x3 += j3;
x4 += j4;
x5 += j5;
x6 += j6;
x7 += j7;
x8 += j8;
x9 += j9;
x10 += j10;
x11 += j11;
x12 += j12;
x13 += j13;
x14 += j14;
x15 += j15;
store_littleendian(out + 0,x0);
store_littleendian(out + 4,x1);
store_littleendian(out + 8,x2);
store_littleendian(out + 12,x3);
store_littleendian(out + 16,x4);
store_littleendian(out + 20,x5);
store_littleendian(out + 24,x6);
store_littleendian(out + 28,x7);
store_littleendian(out + 32,x8);
store_littleendian(out + 36,x9);
store_littleendian(out + 40,x10);
store_littleendian(out + 44,x11);
store_littleendian(out + 48,x12);
store_littleendian(out + 52,x13);
store_littleendian(out + 56,x14);
store_littleendian(out + 60,x15);
return 0;
}
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