/* * "$Id: md5passwd.c,v 1.1.1.13 2005/01/04 19:15:10 jlovell Exp $" * * MD5 password support for the Common UNIX Printing System (CUPS). * * Copyright 1997-2005 by Easy Software Products. * * These coded instructions, statements, and computer programs are the * property of Easy Software Products and are protected by Federal * copyright law. Distribution and use rights are outlined in the file * "LICENSE.txt" which should have been included with this file. If this * file is missing or damaged please contact Easy Software Products * at: * * Attn: CUPS Licensing Information * Easy Software Products * 44141 Airport View Drive, Suite 204 * Hollywood, Maryland 20636 USA * * Voice: (301) 373-9600 * EMail: cups-info@cups.org * WWW: http://www.cups.org * * This file is subject to the Apple OS-Developed Software exception. * * Contents: * * httpMD5() - Compute the MD5 sum of the username:group:password. * httpMD5Nonce() - Combine the MD5 sum of the username, group, and password * with the server-supplied nonce value. * httpMD5String() - Convert an MD5 sum to a character string. */ /* * Include necessary headers... */ #include "http.h" #include "string.h" /* * 'httpMD5()' - Compute the MD5 sum of the username:group:password. */ char * /* O - MD5 sum */ httpMD5(const char *username, /* I - User name */ const char *realm, /* I - Realm name */ const char *passwd, /* I - Password string */ char md5[33]) /* O - MD5 string */ { md5_state_t state; /* MD5 state info */ md5_byte_t sum[16]; /* Sum data */ char line[256]; /* Line to sum */ /* * Compute the MD5 sum of the user name, group name, and password. */ snprintf(line, sizeof(line), "%s:%s:%s", username, realm, passwd); md5_init(&state); md5_append(&state, (md5_byte_t *)line, strlen(line)); md5_finish(&state, sum); /* * Return the sum... */ return (httpMD5String(sum, md5)); } /* * 'httpMD5Final()' - Combine the MD5 sum of the username, group, and password * with the server-supplied nonce value, method, and * request-uri. */ char * /* O - New sum */ httpMD5Final(const char *nonce, /* I - Server nonce value */ const char *method, /* I - METHOD (GET, POST, etc.) */ const char *resource, /* I - Resource path */ char md5[33]) /* IO - MD5 sum */ { md5_state_t state; /* MD5 state info */ md5_byte_t sum[16]; /* Sum data */ char line[1024]; /* Line of data */ char a2[33]; /* Hash of method and resource */ /* * First compute the MD5 sum of the method and resource... */ snprintf(line, sizeof(line), "%s:%s", method, resource); md5_init(&state); md5_append(&state, (md5_byte_t *)line, strlen(line)); md5_finish(&state, sum); httpMD5String(sum, a2); /* * Then combine A1 (MD5 of username, realm, and password) with the nonce * and A2 (method + resource) values to get the final MD5 sum for the * request... */ snprintf(line, sizeof(line), "%s:%s:%s", md5, nonce, a2); md5_init(&state); md5_append(&state, (md5_byte_t *)line, strlen(line)); md5_finish(&state, sum); return (httpMD5String(sum, md5)); } /* * 'httpMD5String()' - Convert an MD5 sum to a character string. */ char * /* O - MD5 sum in hex */ httpMD5String(const md5_byte_t *sum, /* I - MD5 sum data */ char md5[33]) /* O - MD5 sum in hex */ { int i; /* Looping var */ char *md5ptr; /* Pointer into MD5 string */ static const char hex[] = "0123456789abcdef"; /* Hex digits */ /* * Convert the MD5 sum to hexadecimal... */ for (i = 16, md5ptr = md5; i > 0; i --, sum ++) { *md5ptr++ = hex[*sum >> 4]; *md5ptr++ = hex[*sum & 15]; } *md5ptr = '\0'; return (md5); } /* * End of "$Id: md5passwd.c,v 1.1.1.13 2005/01/04 19:15:10 jlovell Exp $". */