1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Author: Tatu Ylonen <ylo@cs.hut.fi> 3*0Sstevel@tonic-gate * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4*0Sstevel@tonic-gate * All rights reserved 5*0Sstevel@tonic-gate * 6*0Sstevel@tonic-gate * As far as I am concerned, the code I have written for this software 7*0Sstevel@tonic-gate * can be used freely for any purpose. Any derived versions of this 8*0Sstevel@tonic-gate * software must be clearly marked as such, and if the derived work is 9*0Sstevel@tonic-gate * incompatible with the protocol description in the RFC file, it must be 10*0Sstevel@tonic-gate * called by a name other than "ssh" or "Secure Shell". 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate * 13*0Sstevel@tonic-gate * Copyright (c) 1999 Niels Provos. All rights reserved. 14*0Sstevel@tonic-gate * 15*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 16*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 17*0Sstevel@tonic-gate * are met: 18*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 19*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 20*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 21*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 22*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 23*0Sstevel@tonic-gate * 24*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25*0Sstevel@tonic-gate * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26*0Sstevel@tonic-gate * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27*0Sstevel@tonic-gate * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28*0Sstevel@tonic-gate * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29*0Sstevel@tonic-gate * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30*0Sstevel@tonic-gate * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31*0Sstevel@tonic-gate * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32*0Sstevel@tonic-gate * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33*0Sstevel@tonic-gate * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34*0Sstevel@tonic-gate * 35*0Sstevel@tonic-gate * 36*0Sstevel@tonic-gate * Description of the RSA algorithm can be found e.g. from the following 37*0Sstevel@tonic-gate * sources: 38*0Sstevel@tonic-gate * 39*0Sstevel@tonic-gate * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994. 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to 42*0Sstevel@tonic-gate * Computer Security. Prentice-Hall, 1989. 43*0Sstevel@tonic-gate * 44*0Sstevel@tonic-gate * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill, 45*0Sstevel@tonic-gate * 1994. 46*0Sstevel@tonic-gate * 47*0Sstevel@tonic-gate * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications 48*0Sstevel@tonic-gate * System and Method. US Patent 4,405,829, 1983. 49*0Sstevel@tonic-gate * 50*0Sstevel@tonic-gate * Hans Riesel: Prime Numbers and Computer Methods for Factorization. 51*0Sstevel@tonic-gate * Birkhauser, 1994. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The RSA Frequently Asked Questions document by RSA Data Security, 54*0Sstevel@tonic-gate * Inc., 1995. 55*0Sstevel@tonic-gate * 56*0Sstevel@tonic-gate * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as 57*0Sstevel@tonic-gate * included below: 58*0Sstevel@tonic-gate * 59*0Sstevel@tonic-gate * [gone - had to be deleted - what a pity] 60*0Sstevel@tonic-gate */ 61*0Sstevel@tonic-gate 62*0Sstevel@tonic-gate #include "includes.h" 63*0Sstevel@tonic-gate RCSID("$OpenBSD: rsa.c,v 1.24 2001/12/27 18:22:16 markus Exp $"); 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate #include "rsa.h" 68*0Sstevel@tonic-gate #include "log.h" 69*0Sstevel@tonic-gate #include "xmalloc.h" 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate void 72*0Sstevel@tonic-gate rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key) 73*0Sstevel@tonic-gate { 74*0Sstevel@tonic-gate u_char *inbuf, *outbuf; 75*0Sstevel@tonic-gate int len, ilen, olen; 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e)) 78*0Sstevel@tonic-gate fatal("rsa_public_encrypt() exponent too small or not odd"); 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate olen = BN_num_bytes(key->n); 81*0Sstevel@tonic-gate outbuf = xmalloc(olen); 82*0Sstevel@tonic-gate 83*0Sstevel@tonic-gate ilen = BN_num_bytes(in); 84*0Sstevel@tonic-gate inbuf = xmalloc(ilen); 85*0Sstevel@tonic-gate BN_bn2bin(in, inbuf); 86*0Sstevel@tonic-gate 87*0Sstevel@tonic-gate if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key, 88*0Sstevel@tonic-gate RSA_PKCS1_PADDING)) <= 0) 89*0Sstevel@tonic-gate fatal("rsa_public_encrypt() failed"); 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate BN_bin2bn(outbuf, len, out); 92*0Sstevel@tonic-gate 93*0Sstevel@tonic-gate memset(outbuf, 0, olen); 94*0Sstevel@tonic-gate memset(inbuf, 0, ilen); 95*0Sstevel@tonic-gate xfree(outbuf); 96*0Sstevel@tonic-gate xfree(inbuf); 97*0Sstevel@tonic-gate } 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate int 100*0Sstevel@tonic-gate rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key) 101*0Sstevel@tonic-gate { 102*0Sstevel@tonic-gate u_char *inbuf, *outbuf; 103*0Sstevel@tonic-gate int len, ilen, olen; 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate olen = BN_num_bytes(key->n); 106*0Sstevel@tonic-gate outbuf = xmalloc(olen); 107*0Sstevel@tonic-gate 108*0Sstevel@tonic-gate ilen = BN_num_bytes(in); 109*0Sstevel@tonic-gate inbuf = xmalloc(ilen); 110*0Sstevel@tonic-gate BN_bn2bin(in, inbuf); 111*0Sstevel@tonic-gate 112*0Sstevel@tonic-gate if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key, 113*0Sstevel@tonic-gate RSA_PKCS1_PADDING)) <= 0) { 114*0Sstevel@tonic-gate error("rsa_private_decrypt() failed"); 115*0Sstevel@tonic-gate } else { 116*0Sstevel@tonic-gate BN_bin2bn(outbuf, len, out); 117*0Sstevel@tonic-gate } 118*0Sstevel@tonic-gate memset(outbuf, 0, olen); 119*0Sstevel@tonic-gate memset(inbuf, 0, ilen); 120*0Sstevel@tonic-gate xfree(outbuf); 121*0Sstevel@tonic-gate xfree(inbuf); 122*0Sstevel@tonic-gate return len; 123*0Sstevel@tonic-gate } 124*0Sstevel@tonic-gate 125*0Sstevel@tonic-gate /* calculate p-1 and q-1 */ 126*0Sstevel@tonic-gate void 127*0Sstevel@tonic-gate rsa_generate_additional_parameters(RSA *rsa) 128*0Sstevel@tonic-gate { 129*0Sstevel@tonic-gate BIGNUM *aux; 130*0Sstevel@tonic-gate BN_CTX *ctx; 131*0Sstevel@tonic-gate 132*0Sstevel@tonic-gate if ((aux = BN_new()) == NULL) 133*0Sstevel@tonic-gate fatal("rsa_generate_additional_parameters: BN_new failed"); 134*0Sstevel@tonic-gate if ((ctx = BN_CTX_new()) == NULL) 135*0Sstevel@tonic-gate fatal("rsa_generate_additional_parameters: BN_CTX_new failed"); 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate BN_sub(aux, rsa->q, BN_value_one()); 138*0Sstevel@tonic-gate BN_mod(rsa->dmq1, rsa->d, aux, ctx); 139*0Sstevel@tonic-gate 140*0Sstevel@tonic-gate BN_sub(aux, rsa->p, BN_value_one()); 141*0Sstevel@tonic-gate BN_mod(rsa->dmp1, rsa->d, aux, ctx); 142*0Sstevel@tonic-gate 143*0Sstevel@tonic-gate BN_clear_free(aux); 144*0Sstevel@tonic-gate BN_CTX_free(ctx); 145*0Sstevel@tonic-gate } 146*0Sstevel@tonic-gate 147