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| -rw-r--r-- | toys/other/sha3sum.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/toys/other/sha3sum.c b/toys/other/sha3sum.c new file mode 100644 index 00000000..10290081 --- /dev/null +++ b/toys/other/sha3sum.c @@ -0,0 +1,106 @@ +/* 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 n + help + usage: sha3sum [-S] [-a BITS] [FILE...] + + Hash function du jour. + + -a Produce a hash BITS long (default 224) + -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); +} |