2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
13 * Copyright (c) 1999 Niels Provos. All rights reserved.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Description of the RSA algorithm can be found e.g. from the following
39 * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
41 * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
42 * Computer Security. Prentice-Hall, 1989.
44 * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
47 * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
48 * System and Method. US Patent 4,405,829, 1983.
50 * Hans Riesel: Prime Numbers and Computer Methods for Factorization.
53 * The RSA Frequently Asked Questions document by RSA Data Security,
56 * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as
59 * [gone - had to be deleted - what a pity]
63 RCSID("$OpenBSD: rsa.c,v 1.16 2000/09/07 20:27:53 deraadt Exp $");
78 key = RSA_generate_key(32, 3, NULL, NULL);
86 * Generates RSA public and private keys. This initializes the data
87 * structures; they should be freed with rsa_clear_private_key and
88 * rsa_clear_public_key.
92 rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
99 printf("Generating RSA keys: ");
102 key = RSA_generate_key(bits, 35, NULL, NULL);
104 fatal("rsa_generate_key: key generation failed.");
106 /* Copy public key parameters */
108 BN_copy(pub->n, key->n);
110 BN_copy(pub->e, key->e);
112 /* Copy private key parameters */
114 BN_copy(prv->n, key->n);
116 BN_copy(prv->e, key->e);
118 BN_copy(prv->d, key->d);
120 BN_copy(prv->p, key->p);
122 BN_copy(prv->q, key->q);
124 prv->dmp1 = BN_new();
125 BN_copy(prv->dmp1, key->dmp1);
127 prv->dmq1 = BN_new();
128 BN_copy(prv->dmq1, key->dmq1);
130 prv->iqmp = BN_new();
131 BN_copy(prv->iqmp, key->iqmp);
136 printf("Key generation complete.\n");
140 rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
142 unsigned char *inbuf, *outbuf;
145 if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
146 fatal("rsa_public_encrypt() exponent too small or not odd");
148 olen = BN_num_bytes(key->n);
149 outbuf = xmalloc(olen);
151 ilen = BN_num_bytes(in);
152 inbuf = xmalloc(ilen);
153 BN_bn2bin(in, inbuf);
155 if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
156 RSA_PKCS1_PADDING)) <= 0)
157 fatal("rsa_public_encrypt() failed");
159 BN_bin2bn(outbuf, len, out);
161 memset(outbuf, 0, olen);
162 memset(inbuf, 0, ilen);
168 rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
170 unsigned char *inbuf, *outbuf;
173 olen = BN_num_bytes(key->n);
174 outbuf = xmalloc(olen);
176 ilen = BN_num_bytes(in);
177 inbuf = xmalloc(ilen);
178 BN_bn2bin(in, inbuf);
180 if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
181 RSA_PKCS1_PADDING)) <= 0)
182 fatal("rsa_private_decrypt() failed");
184 BN_bin2bn(outbuf, len, out);
186 memset(outbuf, 0, olen);
187 memset(inbuf, 0, ilen);
192 /* Set whether to output verbose messages during key generation. */
195 rsa_set_verbose(int verbose)
197 rsa_verbose = verbose;