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ff7ec503 | 1 | /* $OpenBSD: rsa.c,v 1.29 2006/11/06 21:25:28 markus Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
13 | * | |
14 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | * | |
36 | * | |
37 | * Description of the RSA algorithm can be found e.g. from the following | |
38 | * sources: | |
39 | * | |
40 | * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994. | |
41 | * | |
42 | * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to | |
43 | * Computer Security. Prentice-Hall, 1989. | |
44 | * | |
45 | * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill, | |
46 | * 1994. | |
47 | * | |
48 | * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications | |
49 | * System and Method. US Patent 4,405,829, 1983. | |
50 | * | |
51 | * Hans Riesel: Prime Numbers and Computer Methods for Factorization. | |
52 | * Birkhauser, 1994. | |
53 | * | |
54 | * The RSA Frequently Asked Questions document by RSA Data Security, | |
55 | * Inc., 1995. | |
56 | * | |
57 | * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as | |
58 | * included below: | |
59 | * | |
60 | * [gone - had to be deleted - what a pity] | |
61 | */ | |
62 | ||
63 | #include "includes.h" | |
3c0ef626 | 64 | |
9108f8d9 | 65 | #include <sys/types.h> |
66 | ||
67 | #include <stdarg.h> | |
68 | #include <string.h> | |
69 | ||
70 | #include "xmalloc.h" | |
3c0ef626 | 71 | #include "rsa.h" |
72 | #include "log.h" | |
3c0ef626 | 73 | |
74 | void | |
75 | rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key) | |
76 | { | |
77 | u_char *inbuf, *outbuf; | |
78 | int len, ilen, olen; | |
79 | ||
80 | if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e)) | |
81 | fatal("rsa_public_encrypt() exponent too small or not odd"); | |
82 | ||
83 | olen = BN_num_bytes(key->n); | |
84 | outbuf = xmalloc(olen); | |
85 | ||
86 | ilen = BN_num_bytes(in); | |
87 | inbuf = xmalloc(ilen); | |
88 | BN_bn2bin(in, inbuf); | |
89 | ||
90 | if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key, | |
91 | RSA_PKCS1_PADDING)) <= 0) | |
92 | fatal("rsa_public_encrypt() failed"); | |
93 | ||
ff7ec503 | 94 | if (BN_bin2bn(outbuf, len, out) == NULL) |
95 | fatal("rsa_public_encrypt: BN_bin2bn failed"); | |
3c0ef626 | 96 | |
97 | memset(outbuf, 0, olen); | |
98 | memset(inbuf, 0, ilen); | |
99 | xfree(outbuf); | |
100 | xfree(inbuf); | |
101 | } | |
102 | ||
103 | int | |
104 | rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key) | |
105 | { | |
106 | u_char *inbuf, *outbuf; | |
107 | int len, ilen, olen; | |
108 | ||
109 | olen = BN_num_bytes(key->n); | |
110 | outbuf = xmalloc(olen); | |
111 | ||
112 | ilen = BN_num_bytes(in); | |
113 | inbuf = xmalloc(ilen); | |
114 | BN_bn2bin(in, inbuf); | |
115 | ||
116 | if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key, | |
117 | RSA_PKCS1_PADDING)) <= 0) { | |
118 | error("rsa_private_decrypt() failed"); | |
119 | } else { | |
ff7ec503 | 120 | if (BN_bin2bn(outbuf, len, out) == NULL) |
121 | fatal("rsa_private_decrypt: BN_bin2bn failed"); | |
3c0ef626 | 122 | } |
123 | memset(outbuf, 0, olen); | |
124 | memset(inbuf, 0, ilen); | |
125 | xfree(outbuf); | |
126 | xfree(inbuf); | |
127 | return len; | |
128 | } | |
129 | ||
e9a17296 | 130 | /* calculate p-1 and q-1 */ |
3c0ef626 | 131 | void |
132 | rsa_generate_additional_parameters(RSA *rsa) | |
133 | { | |
134 | BIGNUM *aux; | |
135 | BN_CTX *ctx; | |
e9a17296 | 136 | |
137 | if ((aux = BN_new()) == NULL) | |
138 | fatal("rsa_generate_additional_parameters: BN_new failed"); | |
139 | if ((ctx = BN_CTX_new()) == NULL) | |
140 | fatal("rsa_generate_additional_parameters: BN_CTX_new failed"); | |
3c0ef626 | 141 | |
ff7ec503 | 142 | if ((BN_sub(aux, rsa->q, BN_value_one()) == 0) || |
143 | (BN_mod(rsa->dmq1, rsa->d, aux, ctx) == 0) || | |
144 | (BN_sub(aux, rsa->p, BN_value_one()) == 0) || | |
145 | (BN_mod(rsa->dmp1, rsa->d, aux, ctx) == 0)) | |
146 | fatal("rsa_generate_additional_parameters: BN_sub/mod failed"); | |
3c0ef626 | 147 | |
148 | BN_clear_free(aux); | |
149 | BN_CTX_free(ctx); | |
150 | } | |
151 |