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 /* 32 * Copyright (C) 1986, Sun Microsystems, Inc. 33 */ 34 35 #include <sys/cdefs.h> 36 #include <sys/file.h> 37 38 #include <rpc/rpc.h> 39 #include <rpc/key_prot.h> 40 41 #include <mp.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 45 #include "extern.h" 46 47 static void adjust(char[HEXKEYBYTES + 1], char *); 48 static void getseed(char *, int, unsigned char *); 49 50 /* 51 * Generate a seed 52 */ 53 static void 54 getseed(char *seed, int seedsize, unsigned char *pass) 55 { 56 int i; 57 58 for (i = 0; i < seedsize; i++) { 59 seed[i] = (arc4random() & 0xff) ^ pass[i % 8]; 60 } 61 } 62 63 /* 64 * Generate a random public/secret key pair 65 */ 66 void 67 genkeys(char *public, char *secret, char *pass) 68 { 69 unsigned int i; 70 71 # define BASEBITS (8*sizeof (short) - 1) 72 # define BASE (1 << BASEBITS) 73 74 MINT *pk = mp_itom(0); 75 MINT *sk = mp_itom(0); 76 MINT *tmp; 77 MINT *base = mp_itom((short)BASE); 78 MINT *root = mp_itom(PROOT); 79 MINT *modulus = mp_xtom(HEXMODULUS); 80 short r; 81 unsigned short seed[KEYSIZE/BASEBITS + 1]; 82 char *xkey; 83 84 getseed((char *)seed, sizeof (seed), (u_char *)pass); 85 for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) { 86 r = seed[i] % BASE; 87 tmp = mp_itom(r); 88 mp_mult(sk, base, sk); 89 mp_madd(sk, tmp, sk); 90 mp_mfree(tmp); 91 } 92 tmp = mp_itom(0); 93 mp_mdiv(sk, modulus, tmp, sk); 94 mp_mfree(tmp); 95 mp_pow(root, sk, modulus, pk); 96 xkey = mp_mtox(sk); 97 adjust(secret, xkey); 98 xkey = mp_mtox(pk); 99 adjust(public, xkey); 100 mp_mfree(sk); 101 mp_mfree(base); 102 mp_mfree(pk); 103 mp_mfree(root); 104 mp_mfree(modulus); 105 } 106 107 /* 108 * Adjust the input key so that it is 0-filled on the left 109 */ 110 static void 111 adjust(char keyout[HEXKEYBYTES+1], char *keyin) 112 { 113 char *p; 114 char *s; 115 116 for (p = keyin; *p; p++) 117 ; 118 for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) { 119 *s = *p; 120 } 121 while (s >= keyout) { 122 *s-- = '0'; 123 } 124 } 125