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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/rsa/rsa_gen.c
1 /* crypto/rsa/rsa_gen.c */
2 /* Copyright (C) 1995-1998 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
,cb_arg
)
67 unsigned long e_value
;
68 void (*callback
)(P_I_I_P
);
72 BIGNUM
*r0
=NULL
,*r1
=NULL
,*r2
=NULL
,*r3
=NULL
,*tmp
;
73 int bitsp
,bitsq
,ok
= -1,n
=0,i
;
74 BN_CTX
*ctx
=NULL
,*ctx2
=NULL
;
77 if (ctx
== NULL
) goto err
;
79 if (ctx2
== NULL
) goto err
;
89 if (rsa
== NULL
) goto err
;
93 if (rsa
->e
== NULL
) goto err
;
96 /* The problem is when building with 8, 16, or 32 BN_ULONG,
97 * unsigned long can be larger */
98 for (i
=0; i
<sizeof(unsigned long)*8; i
++)
100 if (e_value
& (1<<i
))
101 BN_set_bit(rsa
->e
,i
);
104 if (!BN_set_word(rsa
->e
,e_value
)) goto err
;
107 /* generate p and q */
110 rsa
->p
=BN_generate_prime(NULL
,bitsp
,0,NULL
,NULL
,callback
,cb_arg
);
111 if (rsa
->p
== NULL
) goto err
;
112 if (!BN_sub(r2
,rsa
->p
,BN_value_one())) goto err
;
113 if (!BN_gcd(r1
,r2
,rsa
->e
,ctx
)) goto err
;
114 if (BN_is_one(r1
)) break;
115 if (callback
!= NULL
) callback(2,n
++,cb_arg
);
118 if (callback
!= NULL
) callback(3,0,cb_arg
);
121 rsa
->q
=BN_generate_prime(NULL
,bitsq
,0,NULL
,NULL
,callback
,cb_arg
);
122 if (rsa
->q
== NULL
) goto err
;
123 if (!BN_sub(r2
,rsa
->q
,BN_value_one())) goto err
;
124 if (!BN_gcd(r1
,r2
,rsa
->e
,ctx
)) goto err
;
125 if (BN_is_one(r1
) && (BN_cmp(rsa
->p
,rsa
->q
) != 0))
127 if (callback
!= NULL
) callback(2,n
++,cb_arg
);
130 if (callback
!= NULL
) callback(3,1,cb_arg
);
131 if (BN_cmp(rsa
->p
,rsa
->q
) < 0)
140 if (rsa
->n
== NULL
) goto err
;
141 if (!BN_mul(rsa
->n
,rsa
->p
,rsa
->q
,ctx
)) goto err
;
144 if (!BN_sub(r1
,rsa
->p
,BN_value_one())) goto err
; /* p-1 */
145 if (!BN_sub(r2
,rsa
->q
,BN_value_one())) goto err
; /* q-1 */
146 if (!BN_mul(r0
,r1
,r2
,ctx
)) goto err
; /* (p-1)(q-1) */
148 /* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */
151 if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err;
152 if (BN_is_one(r3)) break;
156 if (!BN_add_word(rsa->e,2L)) goto err;
159 RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE);
163 rsa
->d
=(BIGNUM
*)BN_mod_inverse(NULL
,rsa
->e
,r0
,ctx2
); /* d */
164 if (rsa
->d
== NULL
) goto err
;
166 /* calculate d mod (p-1) */
168 if (rsa
->dmp1
== NULL
) goto err
;
169 if (!BN_mod(rsa
->dmp1
,rsa
->d
,r1
,ctx
)) goto err
;
171 /* calculate d mod (q-1) */
173 if (rsa
->dmq1
== NULL
) goto err
;
174 if (!BN_mod(rsa
->dmq1
,rsa
->d
,r2
,ctx
)) goto err
;
176 /* calculate inverse of q mod p */
177 rsa
->iqmp
=BN_mod_inverse(NULL
,rsa
->q
,rsa
->p
,ctx2
);
178 if (rsa
->iqmp
== NULL
) goto err
;
184 RSAerr(RSA_F_RSA_GENERATE_KEY
,ERR_LIB_BN
);
192 if (rsa
!= NULL
) RSA_free(rsa
);