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 #include <sys/file.h> 43 44 #include <rpc/rpc.h> 45 #include <rpc/key_prot.h> 46 47 #include <mp.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 51 #include "extern.h" 52 53 static void adjust(char[HEXKEYBYTES + 1], char *); 54 static void getseed(char *, int, unsigned char *); 55 56 /* 57 * Generate a seed 58 */ 59 static void 60 getseed(char *seed, int seedsize, unsigned char *pass) 61 { 62 int i; 63 64 for (i = 0; i < seedsize; i++) { 65 seed[i] = (arc4random() & 0xff) ^ pass[i % 8]; 66 } 67 } 68 69 /* 70 * Generate a random public/secret key pair 71 */ 72 void 73 genkeys(char *public, char *secret, char *pass) 74 { 75 unsigned int i; 76 77 # define BASEBITS (8*sizeof (short) - 1) 78 # define BASE (1 << BASEBITS) 79 80 MINT *pk = mp_itom(0); 81 MINT *sk = mp_itom(0); 82 MINT *tmp; 83 MINT *base = mp_itom((short)BASE); 84 MINT *root = mp_itom(PROOT); 85 MINT *modulus = mp_xtom(HEXMODULUS); 86 short r; 87 unsigned short seed[KEYSIZE/BASEBITS + 1]; 88 char *xkey; 89 90 getseed((char *)seed, sizeof (seed), (u_char *)pass); 91 for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) { 92 r = seed[i] % BASE; 93 tmp = mp_itom(r); 94 mp_mult(sk, base, sk); 95 mp_madd(sk, tmp, sk); 96 mp_mfree(tmp); 97 } 98 tmp = mp_itom(0); 99 mp_mdiv(sk, modulus, tmp, sk); 100 mp_mfree(tmp); 101 mp_pow(root, sk, modulus, pk); 102 xkey = mp_mtox(sk); 103 adjust(secret, xkey); 104 xkey = mp_mtox(pk); 105 adjust(public, xkey); 106 mp_mfree(sk); 107 mp_mfree(base); 108 mp_mfree(pk); 109 mp_mfree(root); 110 mp_mfree(modulus); 111 } 112 113 /* 114 * Adjust the input key so that it is 0-filled on the left 115 */ 116 static void 117 adjust(char keyout[HEXKEYBYTES+1], char *keyin) 118 { 119 char *p; 120 char *s; 121 122 for (p = keyin; *p; p++) 123 ; 124 for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) { 125 *s = *p; 126 } 127 while (s >= keyout) { 128 *s-- = '0'; 129 } 130 } 131