1*0Sstevel@tonic-gate /* crypto/rsa/rsa_gen.c */ 2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * This package is an SSL implementation written 6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com). 7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as 10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions 11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA, 12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms 14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15*0Sstevel@tonic-gate * 16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in 17*0Sstevel@tonic-gate * the code are not to be removed. 18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution 19*0Sstevel@tonic-gate * as the author of the parts of the library used. 20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or 21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package. 22*0Sstevel@tonic-gate * 23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 25*0Sstevel@tonic-gate * are met: 26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright 27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 32*0Sstevel@tonic-gate * must display the following acknowledgement: 33*0Sstevel@tonic-gate * "This product includes cryptographic software written by 34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)" 35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library 36*0Sstevel@tonic-gate * being used are not cryptographic related :-). 37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from 38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement: 39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51*0Sstevel@tonic-gate * SUCH DAMAGE. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or 54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be 55*0Sstevel@tonic-gate * copied and put under another distribution licence 56*0Sstevel@tonic-gate * [including the GNU Public Licence.] 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #include <stdio.h> 60*0Sstevel@tonic-gate #include <time.h> 61*0Sstevel@tonic-gate #include "cryptlib.h" 62*0Sstevel@tonic-gate #include <openssl/bn.h> 63*0Sstevel@tonic-gate #include <openssl/rsa.h> 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate RSA *RSA_generate_key(int bits, unsigned long e_value, 66*0Sstevel@tonic-gate void (*callback)(int,int,void *), void *cb_arg) 67*0Sstevel@tonic-gate { 68*0Sstevel@tonic-gate RSA *rsa=NULL; 69*0Sstevel@tonic-gate BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL,*tmp; 70*0Sstevel@tonic-gate int bitsp,bitsq,ok= -1,n=0,i; 71*0Sstevel@tonic-gate BN_CTX *ctx=NULL,*ctx2=NULL; 72*0Sstevel@tonic-gate 73*0Sstevel@tonic-gate ctx=BN_CTX_new(); 74*0Sstevel@tonic-gate if (ctx == NULL) goto err; 75*0Sstevel@tonic-gate ctx2=BN_CTX_new(); 76*0Sstevel@tonic-gate if (ctx2 == NULL) goto err; 77*0Sstevel@tonic-gate BN_CTX_start(ctx); 78*0Sstevel@tonic-gate r0 = BN_CTX_get(ctx); 79*0Sstevel@tonic-gate r1 = BN_CTX_get(ctx); 80*0Sstevel@tonic-gate r2 = BN_CTX_get(ctx); 81*0Sstevel@tonic-gate r3 = BN_CTX_get(ctx); 82*0Sstevel@tonic-gate if (r3 == NULL) goto err; 83*0Sstevel@tonic-gate 84*0Sstevel@tonic-gate bitsp=(bits+1)/2; 85*0Sstevel@tonic-gate bitsq=bits-bitsp; 86*0Sstevel@tonic-gate rsa=RSA_new(); 87*0Sstevel@tonic-gate if (rsa == NULL) goto err; 88*0Sstevel@tonic-gate 89*0Sstevel@tonic-gate /* set e */ 90*0Sstevel@tonic-gate rsa->e=BN_new(); 91*0Sstevel@tonic-gate if (rsa->e == NULL) goto err; 92*0Sstevel@tonic-gate 93*0Sstevel@tonic-gate #if 1 94*0Sstevel@tonic-gate /* The problem is when building with 8, 16, or 32 BN_ULONG, 95*0Sstevel@tonic-gate * unsigned long can be larger */ 96*0Sstevel@tonic-gate for (i=0; i<sizeof(unsigned long)*8; i++) 97*0Sstevel@tonic-gate { 98*0Sstevel@tonic-gate if (e_value & (1UL<<i)) 99*0Sstevel@tonic-gate BN_set_bit(rsa->e,i); 100*0Sstevel@tonic-gate } 101*0Sstevel@tonic-gate #else 102*0Sstevel@tonic-gate if (!BN_set_word(rsa->e,e_value)) goto err; 103*0Sstevel@tonic-gate #endif 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate /* generate p and q */ 106*0Sstevel@tonic-gate for (;;) 107*0Sstevel@tonic-gate { 108*0Sstevel@tonic-gate rsa->p=BN_generate_prime(NULL,bitsp,0,NULL,NULL,callback,cb_arg); 109*0Sstevel@tonic-gate if (rsa->p == NULL) goto err; 110*0Sstevel@tonic-gate if (!BN_sub(r2,rsa->p,BN_value_one())) goto err; 111*0Sstevel@tonic-gate if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err; 112*0Sstevel@tonic-gate if (BN_is_one(r1)) break; 113*0Sstevel@tonic-gate if (callback != NULL) callback(2,n++,cb_arg); 114*0Sstevel@tonic-gate BN_free(rsa->p); 115*0Sstevel@tonic-gate } 116*0Sstevel@tonic-gate if (callback != NULL) callback(3,0,cb_arg); 117*0Sstevel@tonic-gate for (;;) 118*0Sstevel@tonic-gate { 119*0Sstevel@tonic-gate rsa->q=BN_generate_prime(NULL,bitsq,0,NULL,NULL,callback,cb_arg); 120*0Sstevel@tonic-gate if (rsa->q == NULL) goto err; 121*0Sstevel@tonic-gate if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; 122*0Sstevel@tonic-gate if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err; 123*0Sstevel@tonic-gate if (BN_is_one(r1) && (BN_cmp(rsa->p,rsa->q) != 0)) 124*0Sstevel@tonic-gate break; 125*0Sstevel@tonic-gate if (callback != NULL) callback(2,n++,cb_arg); 126*0Sstevel@tonic-gate BN_free(rsa->q); 127*0Sstevel@tonic-gate } 128*0Sstevel@tonic-gate if (callback != NULL) callback(3,1,cb_arg); 129*0Sstevel@tonic-gate if (BN_cmp(rsa->p,rsa->q) < 0) 130*0Sstevel@tonic-gate { 131*0Sstevel@tonic-gate tmp=rsa->p; 132*0Sstevel@tonic-gate rsa->p=rsa->q; 133*0Sstevel@tonic-gate rsa->q=tmp; 134*0Sstevel@tonic-gate } 135*0Sstevel@tonic-gate 136*0Sstevel@tonic-gate /* calculate n */ 137*0Sstevel@tonic-gate rsa->n=BN_new(); 138*0Sstevel@tonic-gate if (rsa->n == NULL) goto err; 139*0Sstevel@tonic-gate if (!BN_mul(rsa->n,rsa->p,rsa->q,ctx)) goto err; 140*0Sstevel@tonic-gate 141*0Sstevel@tonic-gate /* calculate d */ 142*0Sstevel@tonic-gate if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */ 143*0Sstevel@tonic-gate if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */ 144*0Sstevel@tonic-gate if (!BN_mul(r0,r1,r2,ctx)) goto err; /* (p-1)(q-1) */ 145*0Sstevel@tonic-gate 146*0Sstevel@tonic-gate /* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */ 147*0Sstevel@tonic-gate /* for (;;) 148*0Sstevel@tonic-gate { 149*0Sstevel@tonic-gate if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err; 150*0Sstevel@tonic-gate if (BN_is_one(r3)) break; 151*0Sstevel@tonic-gate 152*0Sstevel@tonic-gate if (1) 153*0Sstevel@tonic-gate { 154*0Sstevel@tonic-gate if (!BN_add_word(rsa->e,2L)) goto err; 155*0Sstevel@tonic-gate continue; 156*0Sstevel@tonic-gate } 157*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE); 158*0Sstevel@tonic-gate goto err; 159*0Sstevel@tonic-gate } 160*0Sstevel@tonic-gate */ 161*0Sstevel@tonic-gate rsa->d=BN_mod_inverse(NULL,rsa->e,r0,ctx2); /* d */ 162*0Sstevel@tonic-gate if (rsa->d == NULL) goto err; 163*0Sstevel@tonic-gate 164*0Sstevel@tonic-gate /* calculate d mod (p-1) */ 165*0Sstevel@tonic-gate rsa->dmp1=BN_new(); 166*0Sstevel@tonic-gate if (rsa->dmp1 == NULL) goto err; 167*0Sstevel@tonic-gate if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx)) goto err; 168*0Sstevel@tonic-gate 169*0Sstevel@tonic-gate /* calculate d mod (q-1) */ 170*0Sstevel@tonic-gate rsa->dmq1=BN_new(); 171*0Sstevel@tonic-gate if (rsa->dmq1 == NULL) goto err; 172*0Sstevel@tonic-gate if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx)) goto err; 173*0Sstevel@tonic-gate 174*0Sstevel@tonic-gate /* calculate inverse of q mod p */ 175*0Sstevel@tonic-gate rsa->iqmp=BN_mod_inverse(NULL,rsa->q,rsa->p,ctx2); 176*0Sstevel@tonic-gate if (rsa->iqmp == NULL) goto err; 177*0Sstevel@tonic-gate 178*0Sstevel@tonic-gate ok=1; 179*0Sstevel@tonic-gate err: 180*0Sstevel@tonic-gate if (ok == -1) 181*0Sstevel@tonic-gate { 182*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_GENERATE_KEY,ERR_LIB_BN); 183*0Sstevel@tonic-gate ok=0; 184*0Sstevel@tonic-gate } 185*0Sstevel@tonic-gate BN_CTX_end(ctx); 186*0Sstevel@tonic-gate BN_CTX_free(ctx); 187*0Sstevel@tonic-gate BN_CTX_free(ctx2); 188*0Sstevel@tonic-gate 189*0Sstevel@tonic-gate if (!ok) 190*0Sstevel@tonic-gate { 191*0Sstevel@tonic-gate if (rsa != NULL) RSA_free(rsa); 192*0Sstevel@tonic-gate return(NULL); 193*0Sstevel@tonic-gate } 194*0Sstevel@tonic-gate else 195*0Sstevel@tonic-gate return(rsa); 196*0Sstevel@tonic-gate } 197*0Sstevel@tonic-gate 198