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1899
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1 /*
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2 a implementation of MD4 designed for use in the SMB authentication protocol
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3 Copyright (C) Andrew Tridgell 1997-1998.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 */
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19
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20 #include "ccache.h"
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21
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22 /* NOTE: This code makes no attempt to be fast!
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23
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24 It assumes that a int is at least 32 bits long
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25 */
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26
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27 static struct mdfour *m;
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28
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29 #define MASK32 (0xffffffff)
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30
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31 #define F(X,Y,Z) ((((X)&(Y)) | ((~(X))&(Z))))
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32 #define G(X,Y,Z) ((((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))))
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33 #define H(X,Y,Z) (((X)^(Y)^(Z)))
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34 #define lshift(x,s) (((((x)<<(s))&MASK32) | (((x)>>(32-(s)))&MASK32)))
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35
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36 #define ROUND1(a,b,c,d,k,s) a = lshift((a + F(b,c,d) + M[k])&MASK32, s)
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37 #define ROUND2(a,b,c,d,k,s) a = lshift((a + G(b,c,d) + M[k] + 0x5A827999)&MASK32,s)
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38 #define ROUND3(a,b,c,d,k,s) a = lshift((a + H(b,c,d) + M[k] + 0x6ED9EBA1)&MASK32,s)
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39
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40 /* this applies md4 to 64 byte chunks */
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41 static void mdfour64(uint32 *M)
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42 {
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43 uint32 AA, BB, CC, DD;
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44 uint32 A,B,C,D;
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45
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46 A = m->A; B = m->B; C = m->C; D = m->D;
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47 AA = A; BB = B; CC = C; DD = D;
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48
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49 ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
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50 ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
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51 ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
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52 ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
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53 ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
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54 ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
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55 ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
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56 ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
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57
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58
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59 ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
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60 ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
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61 ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
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62 ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
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63 ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
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64 ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
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65 ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
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66 ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
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67
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68 ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
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69 ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
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70 ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
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71 ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
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72 ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
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73 ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
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74 ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
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75 ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
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76
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77 A += AA; B += BB;
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78 C += CC; D += DD;
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79
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80 A &= MASK32; B &= MASK32;
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81 C &= MASK32; D &= MASK32;
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82
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83 m->A = A; m->B = B; m->C = C; m->D = D;
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84 }
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85
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86 static void copy64(uint32 *M, const unsigned char *in)
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87 {
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88 int i;
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89
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90 for (i=0;i<16;i++)
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91 M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
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92 (in[i*4+1]<<8) | (in[i*4+0]<<0);
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93 }
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94
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95 static void copy4(unsigned char *out,uint32 x)
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96 {
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97 out[0] = x&0xFF;
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98 out[1] = (x>>8)&0xFF;
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99 out[2] = (x>>16)&0xFF;
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100 out[3] = (x>>24)&0xFF;
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101 }
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102
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103 void mdfour_begin(struct mdfour *md)
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104 {
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105 md->A = 0x67452301;
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106 md->B = 0xefcdab89;
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107 md->C = 0x98badcfe;
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108 md->D = 0x10325476;
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109 md->totalN = 0;
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110 md->tail_len = 0;
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111 }
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112
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113
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114 static void mdfour_tail(const unsigned char *in, int n)
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115 {
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116 unsigned char buf[128];
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117 uint32 M[16];
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118 uint32 b;
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119
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120 m->totalN += n;
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121
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122 b = m->totalN * 8;
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123
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124 memset(buf, 0, 128);
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125 if (n) memcpy(buf, in, n);
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126 buf[n] = 0x80;
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127
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128 if (n <= 55) {
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129 copy4(buf+56, b);
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130 copy64(M, buf);
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131 mdfour64(M);
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132 } else {
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133 copy4(buf+120, b);
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134 copy64(M, buf);
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135 mdfour64(M);
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136 copy64(M, buf+64);
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137 mdfour64(M);
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138 }
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139 }
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140
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141 void mdfour_update(struct mdfour *md, const unsigned char *in, int n)
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142 {
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143 uint32 M[16];
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144
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145 m = md;
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146
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147 if (in == NULL) {
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148 mdfour_tail(md->tail, md->tail_len);
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149 return;
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150 }
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151
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152 if (md->tail_len) {
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153 int len = 64 - md->tail_len;
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154 if (len > n) len = n;
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155 memcpy(md->tail+md->tail_len, in, len);
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156 md->tail_len += len;
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157 n -= len;
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158 in += len;
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159 if (md->tail_len == 64) {
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160 copy64(M, md->tail);
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161 mdfour64(M);
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162 m->totalN += 64;
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163 md->tail_len = 0;
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164 }
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165 }
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166
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167 while (n >= 64) {
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168 copy64(M, in);
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169 mdfour64(M);
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170 in += 64;
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171 n -= 64;
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172 m->totalN += 64;
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173 }
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174
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175 if (n) {
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176 memcpy(md->tail, in, n);
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177 md->tail_len = n;
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178 }
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179 }
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180
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181
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182 void mdfour_result(struct mdfour *md, unsigned char *out)
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183 {
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184 m = md;
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185
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186 copy4(out, m->A);
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187 copy4(out+4, m->B);
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188 copy4(out+8, m->C);
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189 copy4(out+12, m->D);
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190 }
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191
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192
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193 void mdfour(unsigned char *out, const unsigned char *in, int n)
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194 {
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195 struct mdfour md;
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196 mdfour_begin(&md);
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197 mdfour_update(&md, in, n);
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198 mdfour_update(&md, NULL, 0);
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199 mdfour_result(&md, out);
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200 }
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201
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202 #ifdef TEST_MDFOUR
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203 static void file_checksum1(char *fname)
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204 {
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205 int fd, i;
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206 struct mdfour md;
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207 unsigned char buf[1024], sum[16];
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208 unsigned chunk;
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209
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210 fd = open(fname,O_RDONLY|O_BINARY);
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211 if (fd == -1) {
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212 perror("fname");
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213 exit(1);
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214 }
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215
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216 chunk = 1 + random() % (sizeof(buf) - 1);
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217
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218 mdfour_begin(&md);
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219
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220 while (1) {
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221 int n = read(fd, buf, chunk);
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222 if (n >= 0) {
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223 mdfour_update(&md, buf, n);
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224 }
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225 if (n < chunk) break;
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226 }
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227
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228 close(fd);
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229
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230 mdfour_update(&md, NULL, 0);
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231
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232 mdfour_result(&md, sum);
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233
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234 for (i=0;i<16;i++)
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235 printf("%02x", sum[i]);
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236 printf("\n");
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237 }
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238
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239 #if 0
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240 #include "../md4.h"
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241
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242 static void file_checksum2(char *fname)
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243 {
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244 int fd, i;
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245 MDstruct md;
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246 unsigned char buf[64], sum[16];
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247
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248 fd = open(fname,O_RDONLY|O_BINARY);
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249 if (fd == -1) {
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250 perror("fname");
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251 exit(1);
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252 }
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253
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254 MDbegin(&md);
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255
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256 while (1) {
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257 int n = read(fd, buf, sizeof(buf));
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258 if (n <= 0) break;
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259 MDupdate(&md, buf, n*8);
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260 }
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261
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262 if (!md.done) {
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263 MDupdate(&md, buf, 0);
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264 }
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265
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266 close(fd);
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267
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268 memcpy(sum, md.buffer, 16);
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269
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270 for (i=0;i<16;i++)
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271 printf("%02x", sum[i]);
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272 printf("\n");
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273 }
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274 #endif
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275
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276 int main(int argc, char *argv[])
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277 {
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278 file_checksum1(argv[1]);
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279 #if 0
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280 file_checksum2(argv[1]);
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281 #endif
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282 return 0;
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283 }
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284 #endif
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