dirhash.c revision a6ce1349539f866334ef3d5758bc2ee44a454acd
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * dirhash.c -- Calculate the hash of a directory entry 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (c) 2001 Daniel Phillips 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (c) 2002 Theodore Ts'o. 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * %Begin-Header% 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This file may be redistributed under the terms of the GNU Library 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * General Public License, version 2. 11868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) * %End-Header% 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include <stdio.h> 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <string.h> 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ext2_fs.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ext2fs.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Keyed 32-bit hash function using TEA in a Davis-Meyer function 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * H0 = Key 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Hi = E Mi(Hi-1) + Hi-1 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (see Applied Cryptography, 2nd edition, p448). 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Jeremy Fitzhardinge <jeremy@zip.com.au> 1998 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This code is made available under the terms of the GPL 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define DELTA 0x9E3779B9 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void TEA_transform(__u32 buf[4], __u32 const in[]) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 sum = 0; 3690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) __u32 b0 = buf[0], b1 = buf[1]; 3790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) __u32 a = in[0], b = in[1], c = in[2], d = in[3]; 3890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int n = 16; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) do { 4190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) sum += DELTA; 4290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b); 4390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d); 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while(--n); 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf[0] += b0; 4790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) buf[1] += b1; 4890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 4990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* F, G and H are basic MD4 functions: selection, majority, parity */ 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z)))) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define G(x, y, z) (((x) & (y)) + (((x) ^ (y)) & (z))) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define H(x, y, z) ((x) ^ (y) ^ (z)) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The generic round function. The application is so specific that 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * we don't bother protecting all the arguments with parens, as is generally 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * good macro practice, in favor of extra legibility. 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Rotation is separate from addition to prevent recomputation 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define ROUND(f, a, b, c, d, x, s) \ 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (a += f(b, c, d) + x, a = (a << s) | (a >> (32-s))) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define K1 0 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define K2 013240474631UL 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define K3 015666365641UL 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Basic cut-down MD4 transform. Returns only 32 bits of result. 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void halfMD4Transform (__u32 buf[4], __u32 const in[]) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Round 1 */ 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, a, b, c, d, in[0] + K1, 3); 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, d, a, b, c, in[1] + K1, 7); 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, c, d, a, b, in[2] + K1, 11); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, b, c, d, a, in[3] + K1, 19); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, a, b, c, d, in[4] + K1, 3); 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, d, a, b, c, in[5] + K1, 7); 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, c, d, a, b, in[6] + K1, 11); 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(F, b, c, d, a, in[7] + K1, 19); 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Round 2 */ 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, a, b, c, d, in[1] + K2, 3); 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, d, a, b, c, in[3] + K2, 5); 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, c, d, a, b, in[5] + K2, 9); 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, b, c, d, a, in[7] + K2, 13); 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, a, b, c, d, in[0] + K2, 3); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, d, a, b, c, in[2] + K2, 5); 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, c, d, a, b, in[4] + K2, 9); 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(G, b, c, d, a, in[6] + K2, 13); 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 94c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* Round 3 */ 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(H, a, b, c, d, in[3] + K3, 3); 96c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) ROUND(H, d, a, b, c, in[7] + K3, 9); 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(H, c, d, a, b, in[2] + K3, 11); 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(H, b, c, d, a, in[6] + K3, 15); 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(H, a, b, c, d, in[1] + K3, 3); 100c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) ROUND(H, d, a, b, c, in[5] + K3, 9); 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ROUND(H, c, d, a, b, in[0] + K3, 11); 102c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) ROUND(H, b, c, d, a, in[4] + K3, 15); 103c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 104c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buf[0] += a; 105c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buf[1] += b; 106c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buf[2] += c; 107c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buf[3] += d; 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#undef ROUND 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#undef F 1122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#undef G 1132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#undef H 1142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#undef K1 1152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#undef K2 116c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#undef K3 1172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)/* The old legacy hash */ 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static ext2_dirhash_t dx_hack_hash (const char *name, int len, 120c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) int unsigned_flag) 12190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles){ 122c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) __u32 hash, hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9; 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const unsigned char *ucp = (const unsigned char *) name; 1242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const signed char *scp = (const signed char *) name; 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int c; 1262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) while (len--) { 12858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (unsigned_flag) 12958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) c = (int) *ucp++; 13058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) else 131ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch c = (int) *scp++; 132ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch hash = hash1 + (hash0 ^ (c * 7152373)); 133a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 134a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (hash & 0x80000000) hash -= 0x7fffffff; 1352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hash1 = hash0; 1362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hash0 = hash; 1372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return (hash0 << 1); 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 14058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 14158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)static void str2hashbuf(const char *msg, int len, __u32 *buf, int num, 14258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) int unsigned_flag) 14358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles){ 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 pad, val; 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int i, c; 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const unsigned char *ucp = (const unsigned char *) msg; 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const signed char *scp = (const signed char *) msg; 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pad = (__u32)len | ((__u32)len << 8); 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pad |= pad << 16; 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) val = pad; 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (len > num*4) 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) len = num * 4; 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (i=0; i < len; i++) { 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((i % 4) == 0) 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) val = pad; 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (unsigned_flag) 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c = (int) ucp[i]; 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c = (int) scp[i]; 162bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch 163bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch val = c + (val << 8); 164bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch if ((i % 4) == 3) { 165bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch *buf++ = val; 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) val = pad; 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) num--; 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (--num >= 0) 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *buf++ = val; 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (--num >= 0) 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *buf++ = pad; 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Returns the hash of a filename. If len is 0 and name is NULL, then 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * this function can be used to test whether or not a hash version is 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * supported. 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The seed is an 4 longword (32 bits) "secret" which can be used to 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * uniquify a hash. If the seed is all zero's, then some default seed 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * may be used. 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * A particular hash version specifies whether or not the seed is 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * represented, and whether or not the returned hash is 32 bits or 64 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * bits. 32 bit hashes will return 0 for the minor hash. 188 */ 189errcode_t ext2fs_dirhash(int version, const char *name, int len, 190 const __u32 *seed, 191 ext2_dirhash_t *ret_hash, 192 ext2_dirhash_t *ret_minor_hash) 193{ 194 __u32 hash; 195 __u32 minor_hash = 0; 196 const char *p; 197 int i; 198 __u32 in[8], buf[4]; 199 int unsigned_flag = 0; 200 201 /* Initialize the default seed for the hash checksum functions */ 202 buf[0] = 0x67452301; 203 buf[1] = 0xefcdab89; 204 buf[2] = 0x98badcfe; 205 buf[3] = 0x10325476; 206 207 /* Check to see if the seed is all zero's */ 208 if (seed) { 209 for (i=0; i < 4; i++) { 210 if (seed[i]) 211 break; 212 } 213 if (i < 4) 214 memcpy(buf, seed, sizeof(buf)); 215 } 216 217 switch (version) { 218 case EXT2_HASH_LEGACY_UNSIGNED: 219 unsigned_flag++; 220 case EXT2_HASH_LEGACY: 221 hash = dx_hack_hash(name, len, unsigned_flag); 222 break; 223 case EXT2_HASH_HALF_MD4_UNSIGNED: 224 unsigned_flag++; 225 case EXT2_HASH_HALF_MD4: 226 p = name; 227 while (len > 0) { 228 str2hashbuf(p, len, in, 8, unsigned_flag); 229 halfMD4Transform(buf, in); 230 len -= 32; 231 p += 32; 232 } 233 minor_hash = buf[2]; 234 hash = buf[1]; 235 break; 236 case EXT2_HASH_TEA_UNSIGNED: 237 unsigned_flag++; 238 case EXT2_HASH_TEA: 239 p = name; 240 while (len > 0) { 241 str2hashbuf(p, len, in, 4, unsigned_flag); 242 TEA_transform(buf, in); 243 len -= 16; 244 p += 16; 245 } 246 hash = buf[0]; 247 minor_hash = buf[1]; 248 break; 249 default: 250 *ret_hash = 0; 251 return EXT2_ET_DIRHASH_UNSUPP; 252 } 253 *ret_hash = hash & ~1; 254 if (ret_minor_hash) 255 *ret_minor_hash = minor_hash; 256 return 0; 257} 258