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/* sha3sum.c - Keccak-f[1600] permutation, sponge construction
*
* Copyright 2014 David Leon Gil <coruus@gmail.com>
*
* https://keccak.team/files/Keccak-reference-3.0.pdf
* https://csrc.nist.gov/publications/detail/fips/202/final
* https://nvlpubs.nist.gov/nistpubs/specialpublications/nist.sp.800-185.pdf
// Depends on FLAG(b) being 4
USE_SHA3SUM(NEWTOY(sha3sum, "bSa#<128>512=224", TOYFLAG_USR|TOYFLAG_BIN))
config SHA3SUM
bool "sha3sum"
default y
help
usage: sha3sum [-S] [-a BITS] [FILE...]
Hash function du jour.
-a Produce a hash BITS long (default 224)
-b Brief (hash only, no filename)
-S Use SHAKE termination byte instead of SHA3 (ask FIPS why)
*/
#define FOR_sha3sum
#include "toys.h"
GLOBALS(
long a;
unsigned long long rc[24];
)
static const char rho[] =
{1,3,6,10,15,21,28,36,45,55,2,14,27,41,56,8,25,43,62,18,39,61,20,44};
static const char pi[] =
{10,7,11,17,18,3,5,16,8,21,24,4,15,23,19,13,12,2,20,14,22,9,6,1};
static const char rcpack[] =
{0x33,0x07,0xdd,0x16,0x38,0x1b,0x7b,0x2b,0xad,0x6a,0xce,0x4c,0x29,0xfe,0x31,
0x68,0x9d,0xb0,0x8f,0x2f,0x0a};
static void keccak(unsigned long long *a)
{
unsigned long long b[5] = {0}, t;
int i, x, y;
for (i = 0; i < 24; i++) {
for (x = 0; x<5; x++) for (b[x] = 0, y = 0; y<25; y += 5) b[x] ^= a[x+y];
for (x = 0; x<5; x++) for (y = 0; y<25; y += 5) {
t = b[(x+1)%5];
a[y+x] ^= b[(x+4)%5]^(t<<1|t>>63);
}
for (t = a[1], x = 0; x<24; x++) {
*b = a[pi[x]];
a[pi[x]] = (t<<rho[x])|(t>>(64-rho[x]));
t = *b;
}
for (y = 0; y<25; y += 5) {
for (x = 0; x<5; x++) b[x] = a[y + x];
for (x = 0; x<5; x++) a[y + x] = b[x]^((~b[(x+1)%5])&b[(x+2)%5]);
}
*a ^= TT.rc[i];
}
}
static void do_sha3sum(int fd, char *name)
{
int span, ii, len, rate = 200-TT.a/4;
char *ss = toybuf, buf[200];
memset(buf, 0, sizeof(buf));
for (len = 0;; ss += rate) {
if ((span = len-(ss-toybuf))<rate) {
memcpy(toybuf, ss, span);
len = span += readall(fd, (ss = toybuf)+span, sizeof(toybuf)-span);
}
if (span>rate) span = rate;
for (ii = 0; ii<span; ii++) buf[ii] ^= ss[ii];
if (rate!=span) {
buf[span] ^= FLAG(S) ? 0x1f : 0x06;
buf[rate-1] ^= 0x80;
}
keccak((void *)buf);
if (span<rate) break;
}
for (ii = 0; ii<TT.a/8; ) {
printf("%02x", buf[ii%rate]);
if (!(++ii%rate)) keccak((void *)buf);
}
memset(buf, 0, sizeof(buf));
// Depends on FLAG(b) being 4
xprintf(" %s\n"+FLAG(b), name);
}
// TODO test 224 256 384 512, and shake 128 256
void sha3sum_main(void)
{
int i, j, k;
char *s;
// Decompress RC table
for (s = (void *)rcpack, i = 127; i; s += 3) for (i>>=1,k = j = 0; k<24; k++)
if (1&(s[k>>3]>>(7-(k&7)))) TT.rc[k] |= 1ULL<<i;
loopfiles(toys.optargs, do_sha3sum);
}
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