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rsa_gen.c

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1/* $OpenBSD: rsa_gen.c,v 1.22 2017/01/29 17:49:23 beck Exp $ */-
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)-
3 * All rights reserved.-
4 *-
5 * This package is an SSL implementation written-
6 * by Eric Young (eay@cryptsoft.com).-
7 * The implementation was written so as to conform with Netscapes SSL.-
8 *-
9 * This library is free for commercial and non-commercial use as long as-
10 * the following conditions are aheared to. The following conditions-
11 * apply to all code found in this distribution, be it the RC4, RSA,-
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation-
13 * included with this distribution is covered by the same copyright terms-
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).-
15 *-
16 * Copyright remains Eric Young's, and as such any Copyright notices in-
17 * the code are not to be removed.-
18 * If this package is used in a product, Eric Young should be given attribution-
19 * as the author of the parts of the library used.-
20 * This can be in the form of a textual message at program startup or-
21 * in documentation (online or textual) provided with the package.-
22 *-
23 * Redistribution and use in source and binary forms, with or without-
24 * modification, are permitted provided that the following conditions-
25 * are met:-
26 * 1. Redistributions of source code must retain the copyright-
27 * notice, this list of conditions and the following disclaimer.-
28 * 2. Redistributions in binary form must reproduce the above copyright-
29 * notice, this list of conditions and the following disclaimer in the-
30 * documentation and/or other materials provided with the distribution.-
31 * 3. All advertising materials mentioning features or use of this software-
32 * must display the following acknowledgement:-
33 * "This product includes cryptographic software written by-
34 * Eric Young (eay@cryptsoft.com)"-
35 * The word 'cryptographic' can be left out if the rouines from the library-
36 * being used are not cryptographic related :-).-
37 * 4. If you include any Windows specific code (or a derivative thereof) from-
38 * the apps directory (application code) you must include an acknowledgement:-
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"-
40 *-
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND-
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE-
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE-
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE-
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL-
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS-
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)-
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT-
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY-
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF-
51 * SUCH DAMAGE.-
52 *-
53 * The licence and distribution terms for any publically available version or-
54 * derivative of this code cannot be changed. i.e. this code cannot simply be-
55 * copied and put under another distribution licence-
56 * [including the GNU Public Licence.]-
57 */-
58-
59-
60/* NB: these functions have been "upgraded", the deprecated versions (which are-
61 * compatibility wrappers using these functions) are in rsa_depr.c.-
62 * - Geoff-
63 */-
64-
65#include <stdio.h>-
66#include <time.h>-
67-
68#include <openssl/bn.h>-
69#include <openssl/err.h>-
70#include <openssl/rsa.h>-
71-
72#include "bn_lcl.h"-
73-
74static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb);-
75-
76/*-
77 * NB: this wrapper would normally be placed in rsa_lib.c and the static-
78 * implementation would probably be in rsa_eay.c. Nonetheless, is kept here so-
79 * that we don't introduce a new linker dependency. Eg. any application that-
80 * wasn't previously linking object code related to key-generation won't have to-
81 * now just because key-generation is part of RSA_METHOD.-
82 */-
83int-
84RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)-
85{-
86 if (rsa->meth->rsa_keygen)
rsa->meth->rsa_keygenDescription
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
87 return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
never executed: return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
0
88 return rsa_builtin_keygen(rsa, bits, e_value, cb);
executed 1 time by 1 test: return rsa_builtin_keygen(rsa, bits, e_value, cb);
Executed by:
  • libcrypto.so.44.0.1
1
89}-
90-
91static int-
92rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)-
93{-
94 BIGNUM *r0 = NULL, *r1 = NULL, *r2 = NULL, *r3 = NULL, *tmp;-
95 BIGNUM pr0, d, p;-
96 int bitsp, bitsq, ok = -1, n = 0;-
97 BN_CTX *ctx = NULL;-
98-
99 ctx = BN_CTX_new();-
100 if (ctx == NULL)
ctx == ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
101 goto err;
never executed: goto err;
0
102 BN_CTX_start(ctx);-
103 if ((r0 = BN_CTX_get(ctx)) == NULL)
(r0 = BN_CTX_g...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
104 goto err;
never executed: goto err;
0
105 if ((r1 = BN_CTX_get(ctx)) == NULL)
(r1 = BN_CTX_g...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
106 goto err;
never executed: goto err;
0
107 if ((r2 = BN_CTX_get(ctx)) == NULL)
(r2 = BN_CTX_g...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
108 goto err;
never executed: goto err;
0
109 if ((r3 = BN_CTX_get(ctx)) == NULL)
(r3 = BN_CTX_g...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
110 goto err;
never executed: goto err;
0
111-
112 bitsp = (bits + 1) / 2;-
113 bitsq = bits - bitsp;-
114-
115 /* We need the RSA components non-NULL */-
116 if (!rsa->n && ((rsa->n = BN_new()) == NULL))
!rsa->nDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->n = BN_... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
117 goto err;
never executed: goto err;
0
118 if (!rsa->d && ((rsa->d = BN_new()) == NULL))
!rsa->dDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->d = BN_... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
119 goto err;
never executed: goto err;
0
120 if (!rsa->e && ((rsa->e = BN_new()) == NULL))
!rsa->eDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->e = BN_... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
121 goto err;
never executed: goto err;
0
122 if (!rsa->p && ((rsa->p = BN_new()) == NULL))
!rsa->pDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->p = BN_... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
123 goto err;
never executed: goto err;
0
124 if (!rsa->q && ((rsa->q = BN_new()) == NULL))
!rsa->qDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->q = BN_... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
125 goto err;
never executed: goto err;
0
126 if (!rsa->dmp1 && ((rsa->dmp1 = BN_new()) == NULL))
!rsa->dmp1Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->dmp1 = ... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
127 goto err;
never executed: goto err;
0
128 if (!rsa->dmq1 && ((rsa->dmq1 = BN_new()) == NULL))
!rsa->dmq1Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->dmq1 = ... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
129 goto err;
never executed: goto err;
0
130 if (!rsa->iqmp && ((rsa->iqmp = BN_new()) == NULL))
!rsa->iqmpDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((rsa->iqmp = ... ((void *)0) )Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
131 goto err;
never executed: goto err;
0
132-
133 BN_copy(rsa->e, e_value);-
134-
135 /* generate p and q */-
136 for (;;) {-
137 if (!BN_generate_prime_ex(rsa->p, bitsp, 0, NULL, NULL, cb))
!BN_generate_p...oid *)0) , cb)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
138 goto err;
never executed: goto err;
0
139 if (!BN_sub(r2, rsa->p, BN_value_one()))
!BN_sub(r2, rs...N_value_one())Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
140 goto err;
never executed: goto err;
0
141 if (!BN_gcd_ct(r1, r2, rsa->e, ctx))
!BN_gcd_ct(r1,..., rsa->e, ctx)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
142 goto err;
never executed: goto err;
0
143 if (BN_is_one(r1))
(((r1))->top == 1)Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
(((r1))->d[0] ...gned long)(1))Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((1) == 0)Description
TRUEnever evaluated
FALSEnever evaluated
(((r1))->top == 0)Description
TRUEnever evaluated
FALSEnever evaluated
!(r1)->negDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-1
144 break;
executed 1 time by 1 test: break;
Executed by:
  • libcrypto.so.44.0.1
1
145 if (!BN_GENCB_call(cb, 2, n++))
!BN_GENCB_call(cb, 2, n++)Description
TRUEnever evaluated
FALSEnever evaluated
0
146 goto err;
never executed: goto err;
0
147 }
never executed: end of block
0
148 if (!BN_GENCB_call(cb, 3, 0))
!BN_GENCB_call(cb, 3, 0)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
149 goto err;
never executed: goto err;
0
150 for (;;) {-
151 /*-
152 * When generating ridiculously small keys, we can get stuck-
153 * continually regenerating the same prime values. Check for-
154 * this and bail if it happens 3 times.-
155 */-
156 unsigned int degenerate = 0;-
157 do {-
158 if (!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL,
!BN_generate_p...oid *)0) , cb)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
159 cb))
!BN_generate_p...oid *)0) , cb)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
160 goto err;
never executed: goto err;
0
161 } while (BN_cmp(rsa->p, rsa->q) == 0 &&
executed 1 time by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
BN_cmp(rsa->p, rsa->q) == 0Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
162 ++degenerate < 3);
++degenerate < 3Description
TRUEnever evaluated
FALSEnever evaluated
0
163 if (degenerate == 3) {
degenerate == 3Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
164 ok = 0; /* we set our own err */-
165 RSAerror(RSA_R_KEY_SIZE_TOO_SMALL);-
166 goto err;
never executed: goto err;
0
167 }-
168 if (!BN_sub(r2, rsa->q, BN_value_one()))
!BN_sub(r2, rs...N_value_one())Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
169 goto err;
never executed: goto err;
0
170 if (!BN_gcd_ct(r1, r2, rsa->e, ctx))
!BN_gcd_ct(r1,..., rsa->e, ctx)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
171 goto err;
never executed: goto err;
0
172 if (BN_is_one(r1))
(((r1))->top == 1)Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
(((r1))->d[0] ...gned long)(1))Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
((1) == 0)Description
TRUEnever evaluated
FALSEnever evaluated
(((r1))->top == 0)Description
TRUEnever evaluated
FALSEnever evaluated
!(r1)->negDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-1
173 break;
executed 1 time by 1 test: break;
Executed by:
  • libcrypto.so.44.0.1
1
174 if (!BN_GENCB_call(cb, 2, n++))
!BN_GENCB_call(cb, 2, n++)Description
TRUEnever evaluated
FALSEnever evaluated
0
175 goto err;
never executed: goto err;
0
176 }
never executed: end of block
0
177 if (!BN_GENCB_call(cb, 3, 1))
!BN_GENCB_call(cb, 3, 1)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
178 goto err;
never executed: goto err;
0
179 if (BN_cmp(rsa->p, rsa->q) < 0) {
BN_cmp(rsa->p, rsa->q) < 0Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-1
180 tmp = rsa->p;-
181 rsa->p = rsa->q;-
182 rsa->q = tmp;-
183 }
executed 1 time by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
1
184-
185 /* calculate n */-
186 if (!BN_mul(rsa->n, rsa->p, rsa->q, ctx))
!BN_mul(rsa->n..., rsa->q, ctx)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
187 goto err;
never executed: goto err;
0
188-
189 /* calculate d */-
190 if (!BN_sub(r1, rsa->p, BN_value_one())) /* p-1 */
!BN_sub(r1, rs...N_value_one())Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
191 goto err;
never executed: goto err;
0
192 if (!BN_sub(r2, rsa->q, BN_value_one())) /* q-1 */
!BN_sub(r2, rs...N_value_one())Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
193 goto err;
never executed: goto err;
0
194 if (!BN_mul(r0, r1, r2, ctx)) /* (p-1)(q-1) */
!BN_mul(r0, r1, r2, ctx)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
195 goto err;
never executed: goto err;
0
196-
197 BN_with_flags(&pr0, r0, BN_FLG_CONSTTIME);-
198-
199 if (!BN_mod_inverse_ct(rsa->d, rsa->e, &pr0, ctx)) /* d */
!BN_mod_invers...>e, &pr0, ctx)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
200 goto err;
never executed: goto err;
0
201-
202 /* set up d for correct BN_FLG_CONSTTIME flag */-
203 BN_with_flags(&d, rsa->d, BN_FLG_CONSTTIME);-
204-
205 /* calculate d mod (p-1) */-
206 if (!BN_mod_ct(rsa->dmp1, &d, r1, ctx))
!BN_div_ct( ((...d),(r1),(ctx))Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
207 goto err;
never executed: goto err;
0
208-
209 /* calculate d mod (q-1) */-
210 if (!BN_mod_ct(rsa->dmq1, &d, r2, ctx))
!BN_div_ct( ((...d),(r2),(ctx))Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
211 goto err;
never executed: goto err;
0
212-
213 /* calculate inverse of q mod p */-
214 BN_with_flags(&p, rsa->p, BN_FLG_CONSTTIME);-
215 if (!BN_mod_inverse_ct(rsa->iqmp, rsa->q, &p, ctx))
!BN_mod_invers...a->q, &p, ctx)Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
216 goto err;
never executed: goto err;
0
217-
218 ok = 1;-
219err:
code before this statement executed 1 time by 1 test: err:
Executed by:
  • libcrypto.so.44.0.1
1
220 if (ok == -1) {
ok == -1Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-1
221 RSAerror(ERR_LIB_BN);-
222 ok = 0;-
223 }
never executed: end of block
0
224 if (ctx != NULL) {
ctx != ((void *)0)Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-1
225 BN_CTX_end(ctx);-
226 BN_CTX_free(ctx);-
227 }
executed 1 time by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
1
228-
229 return ok;
executed 1 time by 1 test: return ok;
Executed by:
  • libcrypto.so.44.0.1
1
230}-
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