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;
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;
94 if (!BN_set_word(rsa->e,e_value)) goto err;
96 /* generate p and q */
99 rsa->p=BN_generate_prime(bitsp,0,NULL,NULL,callback,cb_arg);
100 if (rsa->p == NULL) goto err;
101 if (!BN_sub(r2,rsa->p,BN_value_one())) goto err;
102 if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
103 if (BN_is_one(r1)) break;
104 if (callback != NULL) callback(2,n++,cb_arg);
107 if (callback != NULL) callback(3,0,cb_arg);
110 rsa->q=BN_generate_prime(bitsq,0,NULL,NULL,callback,cb_arg);
111 if (rsa->q == NULL) goto err;
112 if (!BN_sub(r2,rsa->q,BN_value_one())) goto err;
113 if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
114 if (BN_is_one(r1) && (BN_cmp(rsa->p,rsa->q) != 0))
116 if (callback != NULL) callback(2,n++,cb_arg);
119 if (callback != NULL) callback(3,1,cb_arg);
120 if (BN_cmp(rsa->p,rsa->q) < 0)
129 if (rsa->n == NULL) goto err;
130 if (!BN_mul(rsa->n,rsa->p,rsa->q)) goto err;
133 if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */
134 if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */
135 if (!BN_mul(r0,r1,r2)) goto err; /* (p-1)(q-1) */
137 /* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */
140 if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err;
141 if (BN_is_one(r3)) break;
145 if (!BN_add_word(rsa->e,2L)) goto err;
148 RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE);
152 rsa->d=(BIGNUM *)BN_mod_inverse(rsa->e,r0,ctx2); /* d */
153 if (rsa->d == NULL) goto err;
155 /* calculate d mod (p-1) */
157 if (rsa->dmp1 == NULL) goto err;
158 if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx)) goto err;
160 /* calculate d mod (q-1) */
162 if (rsa->dmq1 == NULL) goto err;
163 if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx)) goto err;
165 /* calculate inverse of q mod p */
166 rsa->iqmp=BN_mod_inverse(rsa->q,rsa->p,ctx2);
167 if (rsa->iqmp == NULL) goto err;
173 RSAerr(RSA_F_RSA_GENERATE_KEY,ERR_LIB_BN);
181 if (rsa != NULL) RSA_free(rsa);