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.]
62 #include <openssl/bn.h>
63 #include <openssl/rsa.h>
65 RSA *RSA_generate_key(int bits, unsigned long e_value,
66 void (*callback)(int,int,void *), void *cb_arg)
69 BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL,*tmp;
70 int bitsp,bitsq,ok= -1,n=0,i;
71 BN_CTX *ctx=NULL,*ctx2=NULL;
74 if (ctx == NULL) goto err;
76 if (ctx2 == NULL) goto err;
86 if (rsa == NULL) goto err;
90 if (rsa->e == NULL) goto err;
93 /* The problem is when building with 8, 16, or 32 BN_ULONG,
94 * unsigned long can be larger */
95 for (i=0; i<sizeof(unsigned long)*8; i++)
101 if (!BN_set_word(rsa->e,e_value)) goto err;
104 /* generate p and q */
107 rsa->p=BN_generate_prime(NULL,bitsp,0,NULL,NULL,callback,cb_arg);
108 if (rsa->p == NULL) goto err;
109 if (!BN_sub(r2,rsa->p,BN_value_one())) goto err;
110 if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
111 if (BN_is_one(r1)) break;
112 if (callback != NULL) callback(2,n++,cb_arg);
115 if (callback != NULL) callback(3,0,cb_arg);
118 rsa->q=BN_generate_prime(NULL,bitsq,0,NULL,NULL,callback,cb_arg);
119 if (rsa->q == NULL) goto err;
120 if (!BN_sub(r2,rsa->q,BN_value_one())) goto err;
121 if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
122 if (BN_is_one(r1) && (BN_cmp(rsa->p,rsa->q) != 0))
124 if (callback != NULL) callback(2,n++,cb_arg);
127 if (callback != NULL) callback(3,1,cb_arg);
128 if (BN_cmp(rsa->p,rsa->q) < 0)
137 if (rsa->n == NULL) goto err;
138 if (!BN_mul(rsa->n,rsa->p,rsa->q,ctx)) goto err;
141 if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */
142 if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */
143 if (!BN_mul(r0,r1,r2,ctx)) goto err; /* (p-1)(q-1) */
145 /* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */
148 if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err;
149 if (BN_is_one(r3)) break;
153 if (!BN_add_word(rsa->e,2L)) goto err;
156 RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE);
160 rsa->d=(BIGNUM *)BN_mod_inverse(NULL,rsa->e,r0,ctx2); /* d */
161 if (rsa->d == NULL) goto err;
163 /* calculate d mod (p-1) */
165 if (rsa->dmp1 == NULL) goto err;
166 if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx)) goto err;
168 /* calculate d mod (q-1) */
170 if (rsa->dmq1 == NULL) goto err;
171 if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx)) goto err;
173 /* calculate inverse of q mod p */
174 rsa->iqmp=BN_mod_inverse(NULL,rsa->q,rsa->p,ctx2);
175 if (rsa->iqmp == NULL) goto err;
181 RSAerr(RSA_F_RSA_GENERATE_KEY,ERR_LIB_BN);
189 if (rsa != NULL) RSA_free(rsa);