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1 /* ========================================================================
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2 * Copyright 1988-2007 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: CRAM-MD5 authenticator
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 21 October 1998
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26 * Last Edited: 30 January 2007
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27 */
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28
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29 /* MD5 context */
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30
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31 #define MD5BLKLEN 64 /* MD5 block length */
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32 #define MD5DIGLEN 16 /* MD5 digest length */
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33
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34 typedef struct {
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35 unsigned long chigh; /* high 32bits of byte count */
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36 unsigned long clow; /* low 32bits of byte count */
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37 unsigned long state[4]; /* state (ABCD) */
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38 unsigned char buf[MD5BLKLEN]; /* input buffer */
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39 unsigned char *ptr; /* buffer position */
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40 } MD5CONTEXT;
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41
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42
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43 /* Prototypes */
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44
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45 long auth_md5_valid (void);
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46 long auth_md5_client (authchallenge_t challenger,authrespond_t responder,
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47 char *service,NETMBX *mb,void *stream,
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48 unsigned long *trial,char *user);
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49 char *auth_md5_server (authresponse_t responder,int argc,char *argv[]);
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50 char *auth_md5_pwd (char *user);
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51 char *apop_login (char *chal,char *user,char *md5,int argc,char *argv[]);
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52 char *hmac_md5 (char *text,unsigned long tl,char *key,unsigned long kl);
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53 void md5_init (MD5CONTEXT *ctx);
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54 void md5_update (MD5CONTEXT *ctx,unsigned char *data,unsigned long len);
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55 void md5_final (unsigned char *digest,MD5CONTEXT *ctx);
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56 static void md5_transform (unsigned long *state,unsigned char *block);
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57 static void md5_encode (unsigned char *dst,unsigned long *src,int len);
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58 static void md5_decode (unsigned long *dst,unsigned char *src,int len);
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59
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60
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61 /* Authenticator linkage */
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62
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63 AUTHENTICATOR auth_md5 = {
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64 AU_SECURE, /* secure authenticator */
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65 "CRAM-MD5", /* authenticator name */
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66 auth_md5_valid, /* check if valid */
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67 auth_md5_client, /* client method */
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68 auth_md5_server, /* server method */
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69 NIL /* next authenticator */
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70 };
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71
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72 /* Check if CRAM-MD5 valid on this system
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73 * Returns: T, always
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74 */
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75
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76 long auth_md5_valid (void)
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77 {
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4
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78 #ifndef QMAIL /* qmail extension can always handle MD5 */
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0
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79 struct stat sbuf;
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80 /* server forbids MD5 if no MD5 enable file */
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81 if (stat (MD5ENABLE,&sbuf)) auth_md5.server = NIL;
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4
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82 #endif
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0
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83 return T; /* MD5 is otherwise valid */
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84 }
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85
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86
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87 /* Client authenticator
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88 * Accepts: challenger function
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89 * responder function
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90 * SASL service name
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91 * parsed network mailbox structure
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92 * stream argument for functions
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93 * pointer to current trial count
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94 * returned user name
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95 * Returns: T if success, NIL otherwise, number of trials incremented if retry
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96 */
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97
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98 long auth_md5_client (authchallenge_t challenger,authrespond_t responder,
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99 char *service,NETMBX *mb,void *stream,
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100 unsigned long *trial,char *user)
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101 {
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102 char pwd[MAILTMPLEN];
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103 void *challenge;
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104 unsigned long clen;
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105 long ret = NIL;
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106 /* get challenge */
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107 if (challenge = (*challenger) (stream,&clen)) {
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108 pwd[0] = NIL; /* prompt user */
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109 mm_login (mb,user,pwd,*trial);
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110 if (!pwd[0]) { /* user requested abort */
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111 fs_give ((void **) &challenge);
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112 (*responder) (stream,NIL,0);
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113 *trial = 0; /* cancel subsequent attempts */
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114 ret = LONGT; /* will get a BAD response back */
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115 }
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116 else { /* got password, build response */
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117 sprintf (pwd,"%.65s %.33s",user,hmac_md5 (challenge,clen,
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118 pwd,strlen (pwd)));
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119 fs_give ((void **) &challenge);
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120 /* send credentials, allow retry if OK */
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121 if ((*responder) (stream,pwd,strlen (pwd))) {
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122 if (challenge = (*challenger) (stream,&clen))
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123 fs_give ((void **) &challenge);
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124 else {
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125 ++*trial; /* can try again if necessary */
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126 ret = LONGT; /* check the authentication */
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127 }
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128 }
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129 }
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130 }
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131 memset (pwd,0,MAILTMPLEN); /* erase password in case not overwritten */
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132 if (!ret) *trial = 65535; /* don't retry if bad protocol */
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133 return ret;
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134 }
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135
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136 /* Server authenticator
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137 * Accepts: responder function
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138 * argument count
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139 * argument vector
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140 * Returns: authenticated user name or NIL
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141 *
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142 * This is much hairier than it needs to be due to the necessary of zapping
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143 * the password data.
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144 */
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145
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146 static int md5try = MAXLOGINTRIALS;
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147
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148 char *auth_md5_server (authresponse_t responder,int argc,char *argv[])
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149 {
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150 char *ret = NIL;
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151 char *p,*u,*user,*authuser,*hash,chal[MAILTMPLEN];
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152 unsigned long cl,pl;
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153 /* generate challenge */
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154 sprintf (chal,"<%lu.%lu@%s>",(unsigned long) getpid (),
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155 (unsigned long) time (0),mylocalhost ());
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156 /* send challenge, get user and hash */
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157 if (user = (*responder) (chal,cl = strlen (chal),NIL)) {
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158 /* got user, locate hash */
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159 if (hash = strrchr (user,' ')) {
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160 *hash++ = '\0'; /* tie off user */
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161 /* see if authentication user */
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162 if (authuser = strchr (user,'*')) *authuser++ = '\0';
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163 /* get password */
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164 if (p = auth_md5_pwd ((authuser && *authuser) ? authuser : user)) {
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165 pl = strlen (p);
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166 u = (md5try && !strcmp (hash,hmac_md5 (chal,cl,p,pl))) ? user : NIL;
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167 memset (p,0,pl); /* erase sensitive information */
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168 fs_give ((void **) &p); /* flush erased password */
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169 /* now log in for real */
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170 if (u && authserver_login (u,authuser,argc,argv)) ret = myusername ();
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171 else if (md5try) --md5try;
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172 }
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173 }
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174 fs_give ((void **) &user);
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175 }
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176 if (!ret) sleep (3); /* slow down possible cracker */
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177 return ret;
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178 }
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179
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180 /* Return MD5 password for user
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181 * Accepts: user name
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182 * Returns: plaintext password if success, else NIL
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183 *
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184 * This is much hairier than it needs to be due to the necessary of zapping
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185 * the password data. That's why we don't use stdio here.
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186 */
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187
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188 char *auth_md5_pwd (char *user)
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189 {
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190 struct stat sbuf;
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4
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191 #ifndef QMAIL
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0
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192 int fd = open (MD5ENABLE,O_RDONLY,NIL);
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193 unsigned char *s,*t,*buf,*lusr,*lret;
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194 char *r;
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195 char *ret = NIL;
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196 if (fd >= 0) { /* found the file? */
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197 fstat (fd,&sbuf); /* yes, slurp it into memory */
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198 read (fd,buf = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
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199 /* see if any uppercase characters in user */
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200 for (s = user; *s && ((*s < 'A') || (*s > 'Z')); s++);
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201 /* yes, make lowercase copy */
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202 lusr = *s ? lcase (cpystr (user)) : NIL;
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203 for (s = strtok_r ((char *) buf,"\015\012",&r),lret = NIL; s;
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204 s = ret ? NIL : strtok_r (NIL,"\015\012",&r))
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205 /* must be valid entry line */
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206 if (*s && (*s != '#') && (t = strchr (s,'\t')) && t[1]) {
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207 *t++ = '\0'; /* found tab, tie off user, point to pwd */
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208 if (!strcmp (s,user)) ret = cpystr (t);
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209 else if (lusr && !lret) if (!strcmp (s,lusr)) lret = t;
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210 }
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211 /* accept case-independent name */
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212 if (!ret && lret) ret = cpystr (lret);
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213 /* don't need lowercase copy any more */
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214 if (lusr) fs_give ((void **) &lusr);
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215 /* erase sensitive information from buffer */
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216 memset (buf,0,sbuf.st_size + 1);
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217 fs_give ((void **) &buf); /* flush the buffer */
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218 close (fd); /* don't need file any longer */
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219 }
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4
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220 #else
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221 # ifndef USERAPOPFILE
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222 # define USERAPOPFILE ".apop"
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223 # endif
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224 # ifndef XADDR_DELIM
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225 # ifdef POSTFIX /* Same if-condition is in maildir.c.. sorry */
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226 # define XADDR_DELIM "+"
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227 # else
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228 # define XADDR_DELIM "-"
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229 # endif
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230 # endif
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231 extern char *myMailSuffix;
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232 char mycrypt[BUFSIZ+1];
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233 char *ret = NIL, *tmp=NIL;
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234 FILE *apopfile = NIL;
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235 struct passwd *pw = getpwnam(user);
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236 if (!pw) pw = getpwnam(lcase(tmp=cpystr(user)));
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237 if (!pw && strstr(user, XADDR_DELIM)) { /* Check qmail alias */
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238 char tmp[BUFSIZ];
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239 char *s = user;
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240 memset(tmp, 0, BUFSIZ);
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241 while (*s && s && !pw) {
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242 s = strstr(s, XADDR_DELIM);
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243 if (!s) break;
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244 strncpy(tmp, user, s-user);
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245 s++;
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246 pw = getpwnam(tmp);
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247 }
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248 if (pw) {
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249 myMailSuffix = lcase(cpystr(s-1));
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250 user[strlen(tmp)] = '\0'; /* zap suffix */
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251 }
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252 }
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253 if (pw) {
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254 snprintf(mycrypt, BUFSIZ, "%s/%s", pw->pw_dir, USERAPOPFILE);
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255 if (NIL != myMailSuffix) strcat(mycrypt, myMailSuffix);
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256 if (stat(mycrypt, &sbuf) < 0) {
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257 /* printf("Cannot stat [%s]\015\n", mycrypt); */
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258 return ret;
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259 }
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260 if (sbuf.st_mode & ~(S_IFREG | S_IREAD | S_IWRITE)) {
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261 /* printf("Your apoppassword file is readable by others. Do chmod 600 %s%c\n", mycrypt, 015); */
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262 return ret;
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263 }
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264 #ifdef APOPOPEN
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265 if (stat(APOPOPEN, &sbuf) >= 0) { /* if APPOPEN exists */
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266 /* read apop password via APOPOPEN program */
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267 int bytes = 3+strlen(APOPOPEN)+strlen(mycrypt);
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268 char *aproc = (char*) fs_get(bytes);
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269 snprintf(aproc, bytes, "%s %s%c", APOPOPEN, mycrypt, '\0');
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270 apopfile = popen(aproc, "r");
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271 memset(aproc, 0, bytes);
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272 fs_give((void**)&aproc);
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273 }
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274 #endif /* APOPOPEN */
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275 if ((NIL!=apopfile) || (apopfile = fopen( mycrypt, "r" ))) {
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276 fgets(mycrypt, sizeof(mycrypt) - 1, apopfile);
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277 fclose(apopfile);
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278 if (mycrypt[0]) {
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279 char p = strlen(mycrypt);
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280 while (p > 0 && (mycrypt[p-1] == '\n' || mycrypt[p-1] == '\r')) {
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281 mycrypt[--p] = '\0'; /* zap trailing newlines */
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282 }
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283 }
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284 } else {
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285 return ret;
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286 }
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287 ret = cpystr(mycrypt);
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288 memset(mycrypt, 0, sizeof(mycrypt));
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289 }
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290 #endif /* if QMAIL */
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0
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291 return ret; /* return password */
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292 }
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293
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294 /* APOP server login
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295 * Accepts: challenge
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296 * desired user name
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297 * purported MD5
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298 * argument count
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299 * argument vector
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300 * Returns: authenticated user name or NIL
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301 */
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302
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303 char *apop_login (char *chal,char *user,char *md5,int argc,char *argv[])
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304 {
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305 int i,j;
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306 char *ret = NIL;
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307 char *s,*authuser,tmp[MAILTMPLEN];
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4
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308 #ifdef QMAIL
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309 char *userback = cpystr(user);
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310 #endif
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0
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311 unsigned char digest[MD5DIGLEN];
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312 MD5CONTEXT ctx;
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313 char *hex = "0123456789abcdef";
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314 /* see if authentication user */
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315 if (authuser = strchr (user,'*')) *authuser++ = '\0';
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316 /* get password */
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317 if (s = auth_md5_pwd ((authuser && *authuser) ? authuser : user)) {
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318 md5_init (&ctx); /* initialize MD5 context */
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319 /* build string to get MD5 digest */
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320 sprintf (tmp,"%.128s%.128s",chal,s);
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321 memset (s,0,strlen (s)); /* erase sensitive information */
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322 fs_give ((void **) &s); /* flush erased password */
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323 md5_update (&ctx,(unsigned char *) tmp,strlen (tmp));
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324 memset (tmp,0,MAILTMPLEN); /* erase sensitive information */
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325 md5_final (digest,&ctx);
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326 /* convert to printable hex */
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327 for (i = 0, s = tmp; i < MD5DIGLEN; i++) {
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328 *s++ = hex[(j = digest[i]) >> 4];
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329 *s++ = hex[j & 0xf];
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330 }
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331 *s = '\0'; /* tie off hash text */
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332 memset (digest,0,MD5DIGLEN);/* erase sensitive information */
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333 if (md5try && !strcmp (md5,tmp) &&
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334 authserver_login (user,authuser,argc,argv))
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335 ret = cpystr (myusername ());
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336 else if (md5try) --md5try;
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337 memset (tmp,0,MAILTMPLEN); /* erase sensitive information */
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338 }
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339 if (!ret) sleep (3); /* slow down possible cracker */
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4
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340 else {
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341 extern void permitsmtp();
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342 /* permitsmtp();*/
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343 }
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344 #ifdef QMAIL
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345 return (ret) ? userback : ret;
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346 #else
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0
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347 return ret;
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4
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348 #endif
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0
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349 }
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350
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351 /*
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352 * RFC 2104 HMAC hashing
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353 * Accepts: text to hash
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354 * text length
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355 * key
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356 * key length
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357 * Returns: hash as text, always
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358 */
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359
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360 char *hmac_md5 (char *text,unsigned long tl,char *key,unsigned long kl)
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361 {
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362 int i,j;
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363 static char hshbuf[2*MD5DIGLEN + 1];
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364 char *s;
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365 MD5CONTEXT ctx;
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366 char *hex = "0123456789abcdef";
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367 unsigned char digest[MD5DIGLEN],k_ipad[MD5BLKLEN+1],k_opad[MD5BLKLEN+1];
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368 if (kl > MD5BLKLEN) { /* key longer than pad length? */
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369 md5_init (&ctx); /* yes, set key as MD5(key) */
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370 md5_update (&ctx,(unsigned char *) key,kl);
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371 md5_final (digest,&ctx);
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372 key = (char *) digest;
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373 kl = MD5DIGLEN;
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374 }
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375 memcpy (k_ipad,key,kl); /* store key in pads */
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376 memset (k_ipad+kl,0,(MD5BLKLEN+1)-kl);
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377 memcpy (k_opad,k_ipad,MD5BLKLEN+1);
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378 /* XOR key with ipad and opad values */
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379 for (i = 0; i < MD5BLKLEN; i++) {
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380 k_ipad[i] ^= 0x36;
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381 k_opad[i] ^= 0x5c;
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382 }
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383 md5_init (&ctx); /* inner MD5: hash ipad and text */
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384 md5_update (&ctx,k_ipad,MD5BLKLEN);
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385 md5_update (&ctx,(unsigned char *) text,tl);
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386 md5_final (digest,&ctx);
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387 md5_init (&ctx); /* outer MD5: hash opad and inner results */
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388 md5_update (&ctx,k_opad,MD5BLKLEN);
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389 md5_update (&ctx,digest,MD5DIGLEN);
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390 md5_final (digest,&ctx);
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391 /* convert to printable hex */
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392 for (i = 0, s = hshbuf; i < MD5DIGLEN; i++) {
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393 *s++ = hex[(j = digest[i]) >> 4];
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394 *s++ = hex[j & 0xf];
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395 }
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396 *s = '\0'; /* tie off hash text */
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397 return hshbuf;
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398 }
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399
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|
400 /* Everything after this point is derived from the RSA Data Security, Inc.
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401 * MD5 Message-Digest Algorithm
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|
|
402 */
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|
403
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|
|
404 /* You may wonder why these strange "a &= 0xffffffff;" statements are here.
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|
405 * This is to ensure correct results on machines with a unsigned long size of
|
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|
406 * larger than 32 bits.
|
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407 */
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408
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409 #define RND1(a,b,c,d,x,s,ac) \
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410 a += ((b & c) | (d & ~b)) + x + (unsigned long) ac; \
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411 a &= 0xffffffff; \
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|
412 a = b + ((a << s) | (a >> (32 - s)));
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413
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414 #define RND2(a,b,c,d,x,s,ac) \
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|
415 a += ((b & d) | (c & ~d)) + x + (unsigned long) ac; \
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|
416 a &= 0xffffffff; \
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|
417 a = b + ((a << s) | (a >> (32 - s)));
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418
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419 #define RND3(a,b,c,d,x,s,ac) \
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420 a += (b ^ c ^ d) + x + (unsigned long) ac; \
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|
|
421 a &= 0xffffffff; \
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|
422 a = b + ((a << s) | (a >> (32 - s)));
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423
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424 #define RND4(a,b,c,d,x,s,ac) \
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|
425 a += (c ^ (b | ~d)) + x + (unsigned long) ac; \
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|
|
426 a &= 0xffffffff; \
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427 a = b + ((a << s) | (a >> (32 - s)));
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428
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429 /* Initialize MD5 context
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430 * Accepts: context to initialize
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431 */
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432
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433 void md5_init (MD5CONTEXT *ctx)
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434 {
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|
|
435 ctx->clow = ctx->chigh = 0; /* initialize byte count to zero */
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|
436 /* initialization constants */
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|
|
437 ctx->state[0] = 0x67452301; ctx->state[1] = 0xefcdab89;
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|
438 ctx->state[2] = 0x98badcfe; ctx->state[3] = 0x10325476;
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|
439 ctx->ptr = ctx->buf; /* reset buffer pointer */
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|
440 }
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441
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442
|
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443 /* MD5 add data to context
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444 * Accepts: context
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445 * input data
|
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446 * length of data
|
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|
447 */
|
|
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448
|
|
|
449 void md5_update (MD5CONTEXT *ctx,unsigned char *data,unsigned long len)
|
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450 {
|
|
|
451 unsigned long i = (ctx->buf + MD5BLKLEN) - ctx->ptr;
|
|
|
452 /* update double precision number of bytes */
|
|
|
453 if ((ctx->clow += len) < len) ctx->chigh++;
|
|
|
454 while (i <= len) { /* copy/transform data, 64 bytes at a time */
|
|
|
455 memcpy (ctx->ptr,data,i); /* fill up 64 byte chunk */
|
|
|
456 md5_transform (ctx->state,ctx->ptr = ctx->buf);
|
|
|
457 data += i,len -= i,i = MD5BLKLEN;
|
|
|
458 }
|
|
|
459 memcpy (ctx->ptr,data,len); /* copy final bit of data in buffer */
|
|
|
460 ctx->ptr += len; /* update buffer pointer */
|
|
|
461 }
|
|
|
462
|
|
|
463 /* MD5 Finalization
|
|
|
464 * Accepts: destination digest
|
|
|
465 * context
|
|
|
466 */
|
|
|
467
|
|
|
468 void md5_final (unsigned char *digest,MD5CONTEXT *ctx)
|
|
|
469 {
|
|
|
470 unsigned long i,bits[2];
|
|
|
471 bits[0] = ctx->clow << 3; /* calculate length in bits (before padding) */
|
|
|
472 bits[1] = (ctx->chigh << 3) + (ctx->clow >> 29);
|
|
|
473 *ctx->ptr++ = 0x80; /* padding byte */
|
|
|
474 if ((i = (ctx->buf + MD5BLKLEN) - ctx->ptr) < 8) {
|
|
|
475 memset (ctx->ptr,0,i); /* pad out buffer with zeros */
|
|
|
476 md5_transform (ctx->state,ctx->buf);
|
|
|
477 /* pad out with zeros, leaving 8 bytes */
|
|
|
478 memset (ctx->buf,0,MD5BLKLEN - 8);
|
|
|
479 ctx->ptr = ctx->buf + MD5BLKLEN - 8;
|
|
|
480 }
|
|
|
481 else if (i -= 8) { /* need to pad this buffer? */
|
|
|
482 memset (ctx->ptr,0,i); /* yes, pad out with zeros, leaving 8 bytes */
|
|
|
483 ctx->ptr += i;
|
|
|
484 }
|
|
|
485 md5_encode (ctx->ptr,bits,2); /* make LSB-first length */
|
|
|
486 md5_transform (ctx->state,ctx->buf);
|
|
|
487 /* store state in digest */
|
|
|
488 md5_encode (digest,ctx->state,4);
|
|
|
489 /* erase context */
|
|
|
490 memset (ctx,0,sizeof (MD5CONTEXT));
|
|
|
491 }
|
|
|
492
|
|
|
493 /* MD5 basic transformation
|
|
|
494 * Accepts: state vector
|
|
|
495 * current 64-byte block
|
|
|
496 */
|
|
|
497
|
|
|
498 static void md5_transform (unsigned long *state,unsigned char *block)
|
|
|
499 {
|
|
|
500 unsigned long a = state[0],b = state[1],c = state[2],d = state[3],x[16];
|
|
|
501 md5_decode (x,block,16); /* decode into 16 longs */
|
|
|
502 /* round 1 */
|
|
|
503 RND1 (a,b,c,d,x[ 0], 7,0xd76aa478); RND1 (d,a,b,c,x[ 1],12,0xe8c7b756);
|
|
|
504 RND1 (c,d,a,b,x[ 2],17,0x242070db); RND1 (b,c,d,a,x[ 3],22,0xc1bdceee);
|
|
|
505 RND1 (a,b,c,d,x[ 4], 7,0xf57c0faf); RND1 (d,a,b,c,x[ 5],12,0x4787c62a);
|
|
|
506 RND1 (c,d,a,b,x[ 6],17,0xa8304613); RND1 (b,c,d,a,x[ 7],22,0xfd469501);
|
|
|
507 RND1 (a,b,c,d,x[ 8], 7,0x698098d8); RND1 (d,a,b,c,x[ 9],12,0x8b44f7af);
|
|
|
508 RND1 (c,d,a,b,x[10],17,0xffff5bb1); RND1 (b,c,d,a,x[11],22,0x895cd7be);
|
|
|
509 RND1 (a,b,c,d,x[12], 7,0x6b901122); RND1 (d,a,b,c,x[13],12,0xfd987193);
|
|
|
510 RND1 (c,d,a,b,x[14],17,0xa679438e); RND1 (b,c,d,a,x[15],22,0x49b40821);
|
|
|
511 /* round 2 */
|
|
|
512 RND2 (a,b,c,d,x[ 1], 5,0xf61e2562); RND2 (d,a,b,c,x[ 6], 9,0xc040b340);
|
|
|
513 RND2 (c,d,a,b,x[11],14,0x265e5a51); RND2 (b,c,d,a,x[ 0],20,0xe9b6c7aa);
|
|
|
514 RND2 (a,b,c,d,x[ 5], 5,0xd62f105d); RND2 (d,a,b,c,x[10], 9, 0x2441453);
|
|
|
515 RND2 (c,d,a,b,x[15],14,0xd8a1e681); RND2 (b,c,d,a,x[ 4],20,0xe7d3fbc8);
|
|
|
516 RND2 (a,b,c,d,x[ 9], 5,0x21e1cde6); RND2 (d,a,b,c,x[14], 9,0xc33707d6);
|
|
|
517 RND2 (c,d,a,b,x[ 3],14,0xf4d50d87); RND2 (b,c,d,a,x[ 8],20,0x455a14ed);
|
|
|
518 RND2 (a,b,c,d,x[13], 5,0xa9e3e905); RND2 (d,a,b,c,x[ 2], 9,0xfcefa3f8);
|
|
|
519 RND2 (c,d,a,b,x[ 7],14,0x676f02d9); RND2 (b,c,d,a,x[12],20,0x8d2a4c8a);
|
|
|
520 /* round 3 */
|
|
|
521 RND3 (a,b,c,d,x[ 5], 4,0xfffa3942); RND3 (d,a,b,c,x[ 8],11,0x8771f681);
|
|
|
522 RND3 (c,d,a,b,x[11],16,0x6d9d6122); RND3 (b,c,d,a,x[14],23,0xfde5380c);
|
|
|
523 RND3 (a,b,c,d,x[ 1], 4,0xa4beea44); RND3 (d,a,b,c,x[ 4],11,0x4bdecfa9);
|
|
|
524 RND3 (c,d,a,b,x[ 7],16,0xf6bb4b60); RND3 (b,c,d,a,x[10],23,0xbebfbc70);
|
|
|
525 RND3 (a,b,c,d,x[13], 4,0x289b7ec6); RND3 (d,a,b,c,x[ 0],11,0xeaa127fa);
|
|
|
526 RND3 (c,d,a,b,x[ 3],16,0xd4ef3085); RND3 (b,c,d,a,x[ 6],23, 0x4881d05);
|
|
|
527 RND3 (a,b,c,d,x[ 9], 4,0xd9d4d039); RND3 (d,a,b,c,x[12],11,0xe6db99e5);
|
|
|
528 RND3 (c,d,a,b,x[15],16,0x1fa27cf8); RND3 (b,c,d,a,x[ 2],23,0xc4ac5665);
|
|
|
529 /* round 4 */
|
|
|
530 RND4 (a,b,c,d,x[ 0], 6,0xf4292244); RND4 (d,a,b,c,x[ 7],10,0x432aff97);
|
|
|
531 RND4 (c,d,a,b,x[14],15,0xab9423a7); RND4 (b,c,d,a,x[ 5],21,0xfc93a039);
|
|
|
532 RND4 (a,b,c,d,x[12], 6,0x655b59c3); RND4 (d,a,b,c,x[ 3],10,0x8f0ccc92);
|
|
|
533 RND4 (c,d,a,b,x[10],15,0xffeff47d); RND4 (b,c,d,a,x[ 1],21,0x85845dd1);
|
|
|
534 RND4 (a,b,c,d,x[ 8], 6,0x6fa87e4f); RND4 (d,a,b,c,x[15],10,0xfe2ce6e0);
|
|
|
535 RND4 (c,d,a,b,x[ 6],15,0xa3014314); RND4 (b,c,d,a,x[13],21,0x4e0811a1);
|
|
|
536 RND4 (a,b,c,d,x[ 4], 6,0xf7537e82); RND4 (d,a,b,c,x[11],10,0xbd3af235);
|
|
|
537 RND4 (c,d,a,b,x[ 2],15,0x2ad7d2bb); RND4 (b,c,d,a,x[ 9],21,0xeb86d391);
|
|
|
538 /* update state */
|
|
|
539 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
|
|
|
540 memset (x,0,sizeof (x)); /* erase sensitive data */
|
|
|
541 }
|
|
|
542
|
|
|
543 /* You may wonder why these strange "& 0xff" maskings are here. This is to
|
|
|
544 * ensure correct results on machines with a char size of larger than 8 bits.
|
|
|
545 * For example, the KCC compiler on the PDP-10 uses 9-bit chars.
|
|
|
546 */
|
|
|
547
|
|
|
548 /* MD5 encode unsigned long into LSB-first bytes
|
|
|
549 * Accepts: destination pointer
|
|
|
550 * source
|
|
|
551 * length of source
|
|
|
552 */
|
|
|
553
|
|
|
554 static void md5_encode (unsigned char *dst,unsigned long *src,int len)
|
|
|
555 {
|
|
|
556 int i;
|
|
|
557 for (i = 0; i < len; i++) {
|
|
|
558 *dst++ = (unsigned char) (src[i] & 0xff);
|
|
|
559 *dst++ = (unsigned char) ((src[i] >> 8) & 0xff);
|
|
|
560 *dst++ = (unsigned char) ((src[i] >> 16) & 0xff);
|
|
|
561 *dst++ = (unsigned char) ((src[i] >> 24) & 0xff);
|
|
|
562 }
|
|
|
563 }
|
|
|
564
|
|
|
565
|
|
|
566 /* MD5 decode LSB-first bytes into unsigned long
|
|
|
567 * Accepts: destination pointer
|
|
|
568 * source
|
|
|
569 * length of destination
|
|
|
570 */
|
|
|
571
|
|
|
572 static void md5_decode (unsigned long *dst,unsigned char *src,int len)
|
|
|
573 {
|
|
|
574 int i, j;
|
|
|
575 for (i = 0, j = 0; i < len; i++, j += 4)
|
|
|
576 dst[i] = ((unsigned long) (src[j] & 0xff)) |
|
|
|
577 (((unsigned long) (src[j+1] & 0xff)) << 8) |
|
|
|
578 (((unsigned long) (src[j+2] & 0xff)) << 16) |
|
|
|
579 (((unsigned long) (src[j+3] & 0xff)) << 24);
|
|
|
580 }
|
