1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user or with the express written consent of 8 * Sun Microsystems, Inc. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 */ 30 31 #if !defined(lint) && defined(SCCSIDS) 32 #if 0 33 static char sccsid[] = "@(#)generic.c 1.2 91/03/11 Copyr 1986 Sun Micro"; 34 #endif 35 #endif 36 37 /* 38 * Copyright (C) 1986, Sun Microsystems, Inc. 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/file.h> 45 46 #include <rpc/rpc.h> 47 #include <rpc/key_prot.h> 48 49 #include <mp.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 53 #include "extern.h" 54 55 static void adjust(char[], char *); 56 static void getseed(char *, int, unsigned char *); 57 58 /* 59 * Generate a seed 60 */ 61 static void 62 getseed(char *seed, int seedsize, unsigned char *pass) 63 { 64 int i; 65 66 for (i = 0; i < seedsize; i++) { 67 seed[i] = (arc4random() & 0xff) ^ pass[i % 8]; 68 } 69 } 70 71 /* 72 * Generate a random public/secret key pair 73 */ 74 void 75 genkeys(char *public, char *secret, char *pass) 76 { 77 unsigned int i; 78 79 # define BASEBITS (8*sizeof (short) - 1) 80 # define BASE (1 << BASEBITS) 81 82 MINT *pk = mp_itom(0); 83 MINT *sk = mp_itom(0); 84 MINT *tmp; 85 MINT *base = mp_itom((short)BASE); 86 MINT *root = mp_itom(PROOT); 87 MINT *modulus = mp_xtom(HEXMODULUS); 88 short r; 89 unsigned short seed[KEYSIZE/BASEBITS + 1]; 90 char *xkey; 91 92 getseed((char *)seed, sizeof (seed), (u_char *)pass); 93 for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) { 94 r = seed[i] % BASE; 95 tmp = mp_itom(r); 96 mp_mult(sk, base, sk); 97 mp_madd(sk, tmp, sk); 98 mp_mfree(tmp); 99 } 100 tmp = mp_itom(0); 101 mp_mdiv(sk, modulus, tmp, sk); 102 mp_mfree(tmp); 103 mp_pow(root, sk, modulus, pk); 104 xkey = mp_mtox(sk); 105 adjust(secret, xkey); 106 xkey = mp_mtox(pk); 107 adjust(public, xkey); 108 mp_mfree(sk); 109 mp_mfree(base); 110 mp_mfree(pk); 111 mp_mfree(root); 112 mp_mfree(modulus); 113 } 114 115 /* 116 * Adjust the input key so that it is 0-filled on the left 117 */ 118 static void 119 adjust(char keyout[HEXKEYBYTES+1], char *keyin) 120 { 121 char *p; 122 char *s; 123 124 for (p = keyin; *p; p++) 125 ; 126 for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) { 127 *s = *p; 128 } 129 while (s >= keyout) { 130 *s-- = '0'; 131 } 132 } 133