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