]>
git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/rsa/rsa_gen.c
1 /* crypto/rsa/rsa_gen.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
65 RSA
*RSA_generate_key(bits
, e_value
, callback
)
67 unsigned long e_value
;
68 void (*callback
)(P_I_I
);
71 BIGNUM
*r0
=NULL
,*r1
=NULL
,*r2
=NULL
,*r3
=NULL
,*tmp
;
72 int bitsp
,bitsq
,ok
= -1,n
=0;
73 BN_CTX
*ctx
=NULL
,*ctx2
=NULL
;
76 if (ctx
== NULL
) goto err
;
78 if (ctx2
== NULL
) goto err
;
88 if (rsa
== NULL
) goto err
;
92 if (rsa
->e
== NULL
) goto err
;
93 if (!BN_set_word(rsa
->e
,e_value
)) goto err
;
95 /* generate p and q */
98 rsa
->p
=BN_generate_prime(bitsp
,0,NULL
,NULL
,callback
);
99 if (rsa
->p
== NULL
) goto err
;
100 if (!BN_sub(r2
,rsa
->p
,BN_value_one())) goto err
;
101 if (!BN_gcd(r1
,r2
,rsa
->e
,ctx
)) goto err
;
102 if (BN_is_one(r1
)) break;
103 if (callback
!= NULL
) callback(2,n
++);
106 if (callback
!= NULL
) callback(3,0);
109 rsa
->q
=BN_generate_prime(bitsq
,0,NULL
,NULL
,callback
);
110 if (rsa
->q
== NULL
) goto err
;
111 if (!BN_sub(r2
,rsa
->q
,BN_value_one())) goto err
;
112 if (!BN_gcd(r1
,r2
,rsa
->e
,ctx
)) goto err
;
113 if (BN_is_one(r1
) && (BN_cmp(rsa
->p
,rsa
->q
) != 0))
115 if (callback
!= NULL
) callback(2,n
++);
118 if (callback
!= NULL
) callback(3,1);
119 if (BN_cmp(rsa
->p
,rsa
->q
) < 0)
128 if (rsa
->n
== NULL
) goto err
;
129 if (!BN_mul(rsa
->n
,rsa
->p
,rsa
->q
)) goto err
;
132 if (!BN_sub(r1
,rsa
->p
,BN_value_one())) goto err
; /* p-1 */
133 if (!BN_sub(r2
,rsa
->q
,BN_value_one())) goto err
; /* q-1 */
134 if (!BN_mul(r0
,r1
,r2
)) goto err
; /* (p-1)(q-1) */
136 /* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */
139 if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err;
140 if (BN_is_one(r3)) break;
144 if (!BN_add_word(rsa->e,2L)) goto err;
147 RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE);
151 rsa
->d
=(BIGNUM
*)BN_mod_inverse(rsa
->e
,r0
,ctx2
); /* d */
152 if (rsa
->d
== NULL
) goto err
;
154 /* calculate d mod (p-1) */
156 if (rsa
->dmp1
== NULL
) goto err
;
157 if (!BN_mod(rsa
->dmp1
,rsa
->d
,r1
,ctx
)) goto err
;
159 /* calculate d mod (q-1) */
161 if (rsa
->dmq1
== NULL
) goto err
;
162 if (!BN_mod(rsa
->dmq1
,rsa
->d
,r2
,ctx
)) goto err
;
164 /* calculate inverse of q mod p */
165 rsa
->iqmp
=BN_mod_inverse(rsa
->q
,rsa
->p
,ctx2
);
166 if (rsa
->iqmp
== NULL
) goto err
;
172 RSAerr(RSA_F_RSA_GENERATE_KEY
,ERR_LIB_BN
);
180 if (rsa
!= NULL
) RSA_free(rsa
);