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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
6ae2364d | 5 | * |
bcbf86ec | 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". | |
2b87da3b | 11 | * |
bcbf86ec | 12 | * |
13 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
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. | |
6ae2364d | 23 | * |
bcbf86ec | 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. | |
34 | * | |
35 | * | |
36 | * Description of the RSA algorithm can be found e.g. from the following | |
37 | * sources: | |
6ae2364d | 38 | * |
5260325f | 39 | * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994. |
6ae2364d | 40 | * |
5260325f | 41 | * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to |
42 | * Computer Security. Prentice-Hall, 1989. | |
6ae2364d | 43 | * |
5260325f | 44 | * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill, |
45 | * 1994. | |
6ae2364d | 46 | * |
5260325f | 47 | * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications |
48 | * System and Method. US Patent 4,405,829, 1983. | |
6ae2364d | 49 | * |
5260325f | 50 | * Hans Riesel: Prime Numbers and Computer Methods for Factorization. |
51 | * Birkhauser, 1994. | |
6ae2364d | 52 | * |
bcbf86ec | 53 | * The RSA Frequently Asked Questions document by RSA Data Security, |
54 | * Inc., 1995. | |
6ae2364d | 55 | * |
bcbf86ec | 56 | * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as |
57 | * included below: | |
6ae2364d | 58 | * |
5260325f | 59 | * [gone - had to be deleted - what a pity] |
bcbf86ec | 60 | */ |
8efc0c15 | 61 | |
62 | #include "includes.h" | |
2b63e803 | 63 | RCSID("$OpenBSD: rsa.c,v 1.23 2001/06/27 05:42:24 markus Exp $"); |
8efc0c15 | 64 | |
65 | #include "rsa.h" | |
42f11eb2 | 66 | #include "log.h" |
8efc0c15 | 67 | #include "xmalloc.h" |
68 | ||
8efc0c15 | 69 | void |
5260325f | 70 | rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key) |
8efc0c15 | 71 | { |
1e3b8b07 | 72 | u_char *inbuf, *outbuf; |
5260325f | 73 | int len, ilen, olen; |
8efc0c15 | 74 | |
5260325f | 75 | if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e)) |
76 | fatal("rsa_public_encrypt() exponent too small or not odd"); | |
8efc0c15 | 77 | |
5260325f | 78 | olen = BN_num_bytes(key->n); |
79 | outbuf = xmalloc(olen); | |
8efc0c15 | 80 | |
5260325f | 81 | ilen = BN_num_bytes(in); |
82 | inbuf = xmalloc(ilen); | |
83 | BN_bn2bin(in, inbuf); | |
8efc0c15 | 84 | |
5260325f | 85 | if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key, |
c8d54615 | 86 | RSA_PKCS1_PADDING)) <= 0) |
5260325f | 87 | fatal("rsa_public_encrypt() failed"); |
8efc0c15 | 88 | |
5260325f | 89 | BN_bin2bn(outbuf, len, out); |
8efc0c15 | 90 | |
5260325f | 91 | memset(outbuf, 0, olen); |
92 | memset(inbuf, 0, ilen); | |
93 | xfree(outbuf); | |
94 | xfree(inbuf); | |
8efc0c15 | 95 | } |
96 | ||
46aa2d1f | 97 | int |
8efc0c15 | 98 | rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key) |
99 | { | |
1e3b8b07 | 100 | u_char *inbuf, *outbuf; |
5260325f | 101 | int len, ilen, olen; |
8efc0c15 | 102 | |
5260325f | 103 | olen = BN_num_bytes(key->n); |
104 | outbuf = xmalloc(olen); | |
8efc0c15 | 105 | |
5260325f | 106 | ilen = BN_num_bytes(in); |
107 | inbuf = xmalloc(ilen); | |
108 | BN_bn2bin(in, inbuf); | |
8efc0c15 | 109 | |
5260325f | 110 | if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key, |
46aa2d1f | 111 | RSA_PKCS1_PADDING)) <= 0) { |
112 | error("rsa_private_decrypt() failed"); | |
113 | } else { | |
114 | BN_bin2bn(outbuf, len, out); | |
115 | } | |
5260325f | 116 | memset(outbuf, 0, olen); |
117 | memset(inbuf, 0, ilen); | |
118 | xfree(outbuf); | |
119 | xfree(inbuf); | |
46aa2d1f | 120 | return len; |
8efc0c15 | 121 | } |
457fc0c6 | 122 | |
123 | void | |
2b63e803 | 124 | rsa_generate_additional_parameters(RSA *rsa) |
457fc0c6 | 125 | { |
126 | BIGNUM *aux; | |
127 | BN_CTX *ctx; | |
128 | /* Generate additional parameters */ | |
129 | aux = BN_new(); | |
130 | ctx = BN_CTX_new(); | |
131 | ||
132 | BN_sub(aux, rsa->q, BN_value_one()); | |
133 | BN_mod(rsa->dmq1, rsa->d, aux, ctx); | |
134 | ||
135 | BN_sub(aux, rsa->p, BN_value_one()); | |
136 | BN_mod(rsa->dmp1, rsa->d, aux, ctx); | |
137 | ||
138 | BN_clear_free(aux); | |
139 | BN_CTX_free(ctx); | |
140 | } | |
141 |