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1/*
2 *
3 * rsa.c
4 *
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 *
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * All rights reserved
9 *
10 * Created: Fri Mar 3 22:07:06 1995 ylo
11 *
12 * Description of the RSA algorithm can be found e.g. from the following sources:
13 *
14 * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
15 *
16 * Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
17 * Computer Security. Prentice-Hall, 1989.
18 *
19 * Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
20 * 1994.
21 *
22 * R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
23 * System and Method. US Patent 4,405,829, 1983.
24 *
25 * Hans Riesel: Prime Numbers and Computer Methods for Factorization.
26 * Birkhauser, 1994.
27 *
28 * The RSA Frequently Asked Questions document by RSA Data Security, Inc., 1995.
29 *
30 * RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as included
31 * below:
32 *
33 * [gone - had to be deleted - what a pity]
34 *
35*/
36
37#include "includes.h"
38RCSID("$OpenBSD: rsa.c,v 1.15 2000/06/20 01:39:44 markus Exp $");
39
40#include "rsa.h"
41#include "ssh.h"
42#include "xmalloc.h"
43#include "entropy.h"
44
45int rsa_verbose = 1;
46
47int
48rsa_alive()
49{
50 RSA *key;
51
52 seed_rng();
53 key = RSA_generate_key(32, 3, NULL, NULL);
54 if (key == NULL)
55 return (0);
56 RSA_free(key);
57 return (1);
58}
59
60/*
61 * Key generation progress meter callback
62 */
63void
64keygen_progress(int p, int n, void *arg)
65{
66 const char progress_chars[] = ".o+O?";
67
68 if ((p < 0) || (p > (sizeof(progress_chars) - 2)))
69 p = sizeof(progress_chars) - 2;
70
71 putchar(progress_chars[p]);
72 fflush(stdout);
73}
74
75/*
76 * Generates RSA public and private keys. This initializes the data
77 * structures; they should be freed with rsa_clear_private_key and
78 * rsa_clear_public_key.
79 */
80
81void
82rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
83{
84 RSA *key;
85
86 seed_rng();
87
88 if (rsa_verbose) {
89 printf("Generating RSA keys: ");
90 fflush(stdout);
91 key = RSA_generate_key(bits, 35, keygen_progress, NULL);
92 printf("\n");
93 } else {
94 key = RSA_generate_key(bits, 35, NULL, NULL);
95 }
96 if (key == NULL)
97 fatal("rsa_generate_key: key generation failed.");
98
99 /* Copy public key parameters */
100 pub->n = BN_new();
101 BN_copy(pub->n, key->n);
102 pub->e = BN_new();
103 BN_copy(pub->e, key->e);
104
105 /* Copy private key parameters */
106 prv->n = BN_new();
107 BN_copy(prv->n, key->n);
108 prv->e = BN_new();
109 BN_copy(prv->e, key->e);
110 prv->d = BN_new();
111 BN_copy(prv->d, key->d);
112 prv->p = BN_new();
113 BN_copy(prv->p, key->p);
114 prv->q = BN_new();
115 BN_copy(prv->q, key->q);
116
117 prv->dmp1 = BN_new();
118 BN_copy(prv->dmp1, key->dmp1);
119
120 prv->dmq1 = BN_new();
121 BN_copy(prv->dmq1, key->dmq1);
122
123 prv->iqmp = BN_new();
124 BN_copy(prv->iqmp, key->iqmp);
125
126 RSA_free(key);
127
128 if (rsa_verbose)
129 printf("Key generation complete.\n");
130}
131
132void
133rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
134{
135 unsigned char *inbuf, *outbuf;
136 int len, ilen, olen;
137
138 if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
139 fatal("rsa_public_encrypt() exponent too small or not odd");
140
141 olen = BN_num_bytes(key->n);
142 outbuf = xmalloc(olen);
143
144 ilen = BN_num_bytes(in);
145 inbuf = xmalloc(ilen);
146 BN_bn2bin(in, inbuf);
147
148 if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
149 RSA_PKCS1_PADDING)) <= 0)
150 fatal("rsa_public_encrypt() failed");
151
152 BN_bin2bn(outbuf, len, out);
153
154 memset(outbuf, 0, olen);
155 memset(inbuf, 0, ilen);
156 xfree(outbuf);
157 xfree(inbuf);
158}
159
160void
161rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
162{
163 unsigned char *inbuf, *outbuf;
164 int len, ilen, olen;
165
166 olen = BN_num_bytes(key->n);
167 outbuf = xmalloc(olen);
168
169 ilen = BN_num_bytes(in);
170 inbuf = xmalloc(ilen);
171 BN_bn2bin(in, inbuf);
172
173 if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
174 RSA_PKCS1_PADDING)) <= 0)
175 fatal("rsa_private_decrypt() failed");
176
177 BN_bin2bn(outbuf, len, out);
178
179 memset(outbuf, 0, olen);
180 memset(inbuf, 0, ilen);
181 xfree(outbuf);
182 xfree(inbuf);
183}
184
185/* Set whether to output verbose messages during key generation. */
186
187void
188rsa_set_verbose(int verbose)
189{
190 rsa_verbose = verbose;
191}