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#ifndef _MISC_H____
#define _MISC_H____
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include "crypto_uint8.h"
#include "crypto_uint32.h"
#include "crypto_uint64.h"
typedef crypto_uint8 u8;
typedef crypto_uint32 u32;
typedef crypto_uint64 u64;
#define FOR(i,n) for (i = 0;i < n;++i)
static u32 L32(u32 x,int c) { return (x << c) | ((x&0xffffffff) >> (32 - c)); }
static u32 ld32(const u8 *x)
{
u32 u = x[3];
u = (u<<8)|x[2];
u = (u<<8)|x[1];
return (u<<8)|x[0];
}
static void st32(u8 *x,u32 u)
{
int i;
FOR(i,4) { x[i] = u; u >>= 8; }
}
static const u8 sigma[17] = "expand 32-byte k";
static void core(u8 *out,const u8 *in,const u8 *k)
{
u32 w[16],x[16],y[16],t[4];
int i,j,m;
FOR(i,4) {
x[5*i] = ld32(sigma+4*i);
x[1+i] = ld32(k+4*i);
x[6+i] = ld32(in+4*i);
x[11+i] = ld32(k+16+4*i);
}
FOR(i,16) y[i] = x[i];
FOR(i,20) {
FOR(j,4) {
FOR(m,4) t[m] = x[(5*j+4*m)%16];
t[1] ^= L32(t[0]+t[3], 7);
t[2] ^= L32(t[1]+t[0], 9);
t[3] ^= L32(t[2]+t[1],13);
t[0] ^= L32(t[3]+t[2],18);
FOR(m,4) w[4*j+(j+m)%4] = t[m];
}
FOR(m,16) x[m] = w[m];
}
FOR(i,16) st32(out + 4 * i,x[i] + y[i]);
}
static unsigned char checksum_state[64] = {0};
static void checksum(const unsigned char *x,unsigned long long xlen)
{
u8 block[16];
int i;
while (xlen >= 16) {
core(checksum_state,x,checksum_state);
x += 16;
xlen -= 16;
}
FOR(i,16) block[i] = 0;
FOR(i,xlen) block[i] = x[i];
block[xlen] = 1;
checksum_state[0] ^= 1;
core(checksum_state,block,checksum_state);
}
static int checksum_check(unsigned char *o) {
int j;
for (j = 0; j < 32; ++j) if (checksum_state[j] != o[j]) return 0;
return 1;
}
static void checksum_zero(void) {
long long i;
for (i = 0; i < 64; ++i) checksum_state[i] = 0;
}
static void s20(u8 *c,u64 b,const u8 *n,const u8 *k)
{
u8 z[16],x[64];
u32 u,i;
if (!b) return;
FOR(i,16) z[i] = 0;
FOR(i,8) z[i] = n[i];
while (b >= 64) {
core(x,z,k);
FOR(i,64) c[i] = x[i];
u = 1;
for (i = 8;i < 16;++i) {
u += (u32) z[i];
z[i] = u;
u >>= 8;
}
b -= 64;
c += 64;
}
if (b) {
core(x,z,k);
FOR(i,b) c[i] = x[i];
}
}
static void increment(u8 *n)
{
if (!++n[0])
if (!++n[1])
if (!++n[2])
if (!++n[3])
if (!++n[4])
if (!++n[5])
if (!++n[6])
if (!++n[7])
;
}
static void pseudorandombytes(unsigned char *x,unsigned long long xlen)
{
const static unsigned char randombytes_k[33] = "answer randombytes from crypto_*";
static unsigned char randombytes_n[8];
s20(x,xlen,randombytes_n,randombytes_k);
increment(randombytes_n);
}
static void unsaferandombytes(unsigned char *x,unsigned long long xlen)
{
static unsigned char randombytes_k[32];
static unsigned char randombytes_n[8];
static int initialized = 0;
struct timeval t;
if (!initialized) {
initialized = 1;
gettimeofday(&t, (struct timezone *)0);
st32(randombytes_k + 0, t.tv_usec);
st32(randombytes_k + 4, t.tv_sec);
st32(randombytes_k + 8, getpid());
st32(randombytes_k + 12, getppid());
s20(randombytes_k,32,randombytes_n,randombytes_k);
}
s20(x,xlen,randombytes_n,randombytes_k);
increment(randombytes_n);
}
#define fail_(a, b, x) do { fprintf(stderr, "%s:%llu: %s\n", (a), (unsigned long long)(b), (x)); fflush(stderr); _exit(111); } while (0);
#define fail(x) fail_(__FILE__, __LINE__, (x))
static void fail_printdata(const char *text, unsigned char *data, long long len) {
long long i;
fprintf(stderr, "%s = {\n ", text);
for (i = 0; i < len; ++i) {
if (i == len - 1) {
fprintf(stderr, "0x%02x", data[i]);
}
else {
fprintf(stderr, "0x%02x, ", data[i]);
if (i % 8 == 7) fprintf(stderr, "\n ");
}
}
fprintf(stderr, "\n};\n");
fflush(stderr);
}
#define fail_whenbadchecksum(x) \
if (!checksum_check((x))) { \
fail_printdata("checksum_expected", (x), 32); \
fail_printdata("checksum_computed", checksum_state, 32); \
fail("checksum failure"); \
}
#endif
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