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8efc0c15 | 1 | /* |
5260325f | 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 | * | |
8efc0c15 | 35 | */ |
36 | ||
37 | #include "includes.h" | |
38 | RCSID("$Id$"); | |
39 | ||
40 | #include "rsa.h" | |
41 | #include "ssh.h" | |
42 | #include "xmalloc.h" | |
69c76614 | 43 | #include "random.h" |
8efc0c15 | 44 | |
45 | int rsa_verbose = 1; | |
46 | ||
1c7ff935 | 47 | /* |
48 | * Seed OpenSSL's random number generator | |
49 | */ | |
50 | void | |
51 | seed_rng() | |
52 | { | |
53 | char buf[64]; | |
54 | ||
55 | get_random_bytes(buf, sizeof(buf)); | |
56 | RAND_seed(buf, sizeof(buf)); | |
57 | memset(buf, 0, sizeof(buf)); | |
58 | } | |
59 | ||
8efc0c15 | 60 | int |
61 | rsa_alive() | |
62 | { | |
5260325f | 63 | RSA *key; |
8efc0c15 | 64 | |
54096dcc | 65 | seed_rng(); |
5260325f | 66 | key = RSA_generate_key(32, 3, NULL, NULL); |
67 | if (key == NULL) | |
68 | return (0); | |
69 | RSA_free(key); | |
70 | return (1); | |
8efc0c15 | 71 | } |
72 | ||
db513105 | 73 | /* |
74 | * Key generation progress meter callback | |
75 | */ | |
76 | void | |
77 | keygen_progress(int p, int n, void *arg) | |
78 | { | |
79 | const char progress_chars[] = ".o+O?"; | |
80 | ||
81 | if ((p < 0) || (p > (sizeof(progress_chars) - 2))) | |
69c76614 | 82 | p = sizeof(progress_chars) - 2; |
db513105 | 83 | |
69c76614 | 84 | putchar(progress_chars[p]); |
db513105 | 85 | fflush(stdout); |
86 | } | |
87 | ||
aa3378df | 88 | /* |
89 | * Generates RSA public and private keys. This initializes the data | |
90 | * structures; they should be freed with rsa_clear_private_key and | |
91 | * rsa_clear_public_key. | |
92 | */ | |
8efc0c15 | 93 | |
94 | void | |
95 | rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits) | |
96 | { | |
5260325f | 97 | RSA *key; |
98 | ||
69c76614 | 99 | seed_rng(); |
100 | ||
5260325f | 101 | if (rsa_verbose) { |
102 | printf("Generating RSA keys: "); | |
103 | fflush(stdout); | |
db513105 | 104 | key = RSA_generate_key(bits, 35, keygen_progress, NULL); |
105 | printf("\n"); | |
106 | } else { | |
107 | key = RSA_generate_key(bits, 35, NULL, NULL); | |
5260325f | 108 | } |
5260325f | 109 | if (key == NULL) |
110 | fatal("rsa_generate_key: key generation failed."); | |
111 | ||
112 | /* Copy public key parameters */ | |
113 | pub->n = BN_new(); | |
114 | BN_copy(pub->n, key->n); | |
115 | pub->e = BN_new(); | |
116 | BN_copy(pub->e, key->e); | |
117 | ||
118 | /* Copy private key parameters */ | |
119 | prv->n = BN_new(); | |
120 | BN_copy(prv->n, key->n); | |
121 | prv->e = BN_new(); | |
122 | BN_copy(prv->e, key->e); | |
123 | prv->d = BN_new(); | |
124 | BN_copy(prv->d, key->d); | |
125 | prv->p = BN_new(); | |
126 | BN_copy(prv->p, key->p); | |
127 | prv->q = BN_new(); | |
128 | BN_copy(prv->q, key->q); | |
129 | ||
130 | prv->dmp1 = BN_new(); | |
131 | BN_copy(prv->dmp1, key->dmp1); | |
132 | ||
133 | prv->dmq1 = BN_new(); | |
134 | BN_copy(prv->dmq1, key->dmq1); | |
135 | ||
136 | prv->iqmp = BN_new(); | |
137 | BN_copy(prv->iqmp, key->iqmp); | |
138 | ||
139 | RSA_free(key); | |
140 | ||
141 | if (rsa_verbose) | |
142 | printf("Key generation complete.\n"); | |
8efc0c15 | 143 | } |
144 | ||
145 | void | |
5260325f | 146 | rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key) |
8efc0c15 | 147 | { |
5260325f | 148 | char *inbuf, *outbuf; |
149 | int len, ilen, olen; | |
8efc0c15 | 150 | |
5260325f | 151 | if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e)) |
152 | fatal("rsa_public_encrypt() exponent too small or not odd"); | |
8efc0c15 | 153 | |
5260325f | 154 | olen = BN_num_bytes(key->n); |
155 | outbuf = xmalloc(olen); | |
8efc0c15 | 156 | |
5260325f | 157 | ilen = BN_num_bytes(in); |
158 | inbuf = xmalloc(ilen); | |
159 | BN_bn2bin(in, inbuf); | |
8efc0c15 | 160 | |
5260325f | 161 | if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key, |
162 | RSA_PKCS1_PADDING)) <= 0) | |
163 | fatal("rsa_public_encrypt() failed"); | |
8efc0c15 | 164 | |
5260325f | 165 | BN_bin2bn(outbuf, len, out); |
8efc0c15 | 166 | |
5260325f | 167 | memset(outbuf, 0, olen); |
168 | memset(inbuf, 0, ilen); | |
169 | xfree(outbuf); | |
170 | xfree(inbuf); | |
8efc0c15 | 171 | } |
172 | ||
173 | void | |
174 | rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key) | |
175 | { | |
5260325f | 176 | char *inbuf, *outbuf; |
177 | int len, ilen, olen; | |
8efc0c15 | 178 | |
5260325f | 179 | olen = BN_num_bytes(key->n); |
180 | outbuf = xmalloc(olen); | |
8efc0c15 | 181 | |
5260325f | 182 | ilen = BN_num_bytes(in); |
183 | inbuf = xmalloc(ilen); | |
184 | BN_bn2bin(in, inbuf); | |
8efc0c15 | 185 | |
5260325f | 186 | if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key, |
187 | RSA_SSLV23_PADDING)) <= 0) | |
188 | fatal("rsa_private_decrypt() failed"); | |
8efc0c15 | 189 | |
5260325f | 190 | BN_bin2bn(outbuf, len, out); |
8efc0c15 | 191 | |
5260325f | 192 | memset(outbuf, 0, olen); |
193 | memset(inbuf, 0, ilen); | |
194 | xfree(outbuf); | |
195 | xfree(inbuf); | |
8efc0c15 | 196 | } |
197 | ||
198 | /* Set whether to output verbose messages during key generation. */ | |
199 | ||
200 | void | |
201 | rsa_set_verbose(int verbose) | |
202 | { | |
5260325f | 203 | rsa_verbose = verbose; |
8efc0c15 | 204 | } |