diff options
Diffstat (limited to 'toys/lsb')
| -rw-r--r-- | toys/lsb/md5sum.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/toys/lsb/md5sum.c b/toys/lsb/md5sum.c new file mode 100644 index 00000000..44bafb1f --- /dev/null +++ b/toys/lsb/md5sum.c @@ -0,0 +1,239 @@ +/* vi: set sw=4 ts=4: + * + * md5sum.c - Calculate RFC 1321 md5 hash and sha1 hash. + * + * Copyright 2012 Rob Landley <rob@landley.net> + * + * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/md5sum.html + * and http://www.ietf.org/rfc/rfc1321.txt + * + * They're combined this way to share infrastructure, and because md5sum is + * and LSB standard command, sha1sum is just a good idea. + +USE_MD5SUM(NEWTOY(md5sum, NULL, TOYFLAG_USR|TOYFLAG_BIN)) +USE_MD5SUM_SHA1SUM(OLDTOY(sha1sum, md5sum, NULL, TOYFLAG_USR|TOYFLAG_BIN)) + +config MD5SUM + bool "md5sum" + default n + help + usage: md5sum [FILE]... + + Calculate md5 hash for each input file, reading from stdin if none. + Output one hash (16 hex digits) for each input file, followed by + filename. + +config MD5SUM_SHA1SUM + bool "sha1sum" + depends on MD5SUM + help + usage: sha1sum [FILE]... + + calculate sha1 hash for each input file, reading from stdin if one. + Output one hash (20 hex digits) for each input file, followed by + filename. +*/ + +#define FOR_md5sum +#include "toys.h" + +GLOBALS( + unsigned state[5]; + unsigned oldstate[5]; + uint64_t count; + union { + char c[64]; + unsigned i[16]; + } buffer; +) + +// for(i=0; i<64; i++) md5table[i] = abs(sin(i+1))*(1<<32); But calculating +// that involves not just floating point but pulling in -lm (and arguing with +// C about whether 1<<32 is a valid thing to do on 32 bit platforms) so: + +static uint32_t md5table[64] = { + 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, + 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, + 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340, + 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, + 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, + 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, + 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa, + 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, + 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, + 0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, + 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 +}; + +// Mix next 64 bytes of data into md5 hash + +static void md5_transform(void) +{ + unsigned x[4], *b = (unsigned *)TT.buffer.c; + int i; + + memcpy(x, TT.state, sizeof(x)); + + for (i=0; i<64; i++) { + unsigned int in, a, rot, temp; + + a = (-i)&3; + if (i<16) { + in = i; + rot = 7+(5*(i&3)); + temp = x[(a+1)&3]; + temp = (temp & x[(a+2)&3]) | ((~temp) & x[(a+3)&3]); + } else if (i<32) { + in = (1+(5*i))&15; + temp = (i&3)+1; + rot = temp*5; + if (temp&2) rot--; + temp = x[(a+3)&3]; + temp = (x[(a+1)&3] & temp) | (x[(a+2)&3] & ~temp); + } else if (i<48) { + in = (5+(3*(i&15)))&15; + rot = i&3; + rot = 4+(5*rot)+((rot+1)&6); + temp = x[(a+1)&3] ^ x[(a+2)&3] ^ x[(a+3)&3]; + } else { + in = (7*(i&15))&15; + rot = (i&3)+1; + rot = (5*rot)+(((rot+2)&2)>>1); + temp = x[(a+2)&3] ^ (x[(a+1)&3] | ~x[(a+3)&3]); + } + temp += x[a] + b[in] + md5table[i]; + x[a] = x[(a+1)&3] + ((temp<<rot) | (temp>>(32-rot))); + } + for (i=0; i<4; i++) TT.state[i] += x[i]; +} + +// Mix next 64 bytes of data into sha1 hash. + +static const unsigned rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6}; +#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) + +static void sha1_transform(void) +{ + int i, j, k, count; + unsigned *block = TT.buffer.i; + unsigned *rot[5], *temp; + + // Copy context->state[] to working vars + for (i=0; i<5; i++) { + TT.oldstate[i] = TT.state[i]; + rot[i] = TT.state + i; + } + // 4 rounds of 20 operations each. + for (i=count=0; i<4; i++) { + for (j=0; j<20; j++) { + unsigned work; + + work = *rot[2] ^ *rot[3]; + if (!i) work = (work & *rot[1]) ^ *rot[3]; + else { + if (i==2) work = ((*rot[1]|*rot[2])&*rot[3])|(*rot[1]&*rot[2]); + else work ^= *rot[1]; + } + + if (!i && j<16) + work += block[count] = (rol(block[count],24)&0xFF00FF00) + | (rol(block[count],8)&0x00FF00FF); + else + work += block[count&15] = rol(block[(count+13)&15] + ^ block[(count+8)&15] ^ block[(count+2)&15] ^ block[count&15], 1); + *rot[4] += work + rol(*rot[0],5) + rconsts[i]; + *rot[1] = rol(*rot[1],30); + + // Rotate by one for next time. + temp = rot[4]; + for (k=4; k; k--) rot[k] = rot[k-1]; + *rot = temp; + count++; + } + } + // Add the previous values of state[] + for (i=0; i<5; i++) TT.state[i] += TT.oldstate[i]; +} + +// Fill the 64-byte working buffer and call transform() when full. + +static void hash_update(char *data, unsigned int len, void (*transform)(void)) +{ + unsigned int i, j; + + j = TT.count & 63; + TT.count += len; + + // Enough data to process a frame? + if ((j + len) > 63) { + i = 64-j; + memcpy(TT.buffer.c + j, data, i); + transform(); + for ( ; i + 63 < len; i += 64) { + memcpy(TT.buffer.c, data + i, 64); + transform(); + } + j = 0; + } else i = 0; + // Grab remaining chunk + memcpy(TT.buffer.c + j, data + i, len - i); +} + +// Callback for loopfiles() + +static void do_hash(int fd, char *name) +{ + uint64_t count; + int i, sha1=toys.which->name[0]=='s';; + char buf; + void (*transform)(void); + + /* SHA1 initialization constants (md5sum uses first 4) */ + TT.state[0] = 0x67452301; + TT.state[1] = 0xEFCDAB89; + TT.state[2] = 0x98BADCFE; + TT.state[3] = 0x10325476; + TT.state[4] = 0xC3D2E1F0; + TT.count = 0; + + transform = sha1 ? sha1_transform : md5_transform; + for (;;) { + i = read(fd, toybuf, sizeof(toybuf)); + if (i<1) break; + hash_update(toybuf, i, transform); + } + + count = TT.count << 3; + + // End the message by appending a "1" bit to the data, ending with the + // message size (in bits, big endian), and adding enough zero bits in + // between to pad to the end of the next 64-byte frame. + // + // Since our input up to now has been in whole bytes, we can deal with + // bytes here too. + + buf = 0x80; + do { + hash_update(&buf, 1, transform); + buf = 0; + } while ((TT.count & 63) != 56); + if (sha1) count=bswap_64(count); + for (i = 0; i < 8; i++) + TT.buffer.c[56+i] = count >> (8*i); + transform(); + + if (sha1) + for (i = 0; i < 20; i++) + printf("%02x", 255&(TT.state[i>>2] >> ((3-(i & 3)) * 8))); + else for (i=0; i<4; i++) printf("%08x", SWAP_BE32(TT.state[i])); + + // Wipe variables. Cryptographer paranoia. + memset(&TT, 0, sizeof(TT)); + + printf(" %s\n", name); +} + +void md5sum_main(void) +{ + loopfiles(toys.optargs, do_hash); +} |