1*0Sstevel@tonic-gate /* crypto/dsa/dsa_ossl.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 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60*0Sstevel@tonic-gate 61*0Sstevel@tonic-gate #include <stdio.h> 62*0Sstevel@tonic-gate #include "cryptlib.h" 63*0Sstevel@tonic-gate #include <openssl/bn.h> 64*0Sstevel@tonic-gate #include <openssl/dsa.h> 65*0Sstevel@tonic-gate #include <openssl/rand.h> 66*0Sstevel@tonic-gate #include <openssl/asn1.h> 67*0Sstevel@tonic-gate 68*0Sstevel@tonic-gate static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); 69*0Sstevel@tonic-gate static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp); 70*0Sstevel@tonic-gate static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig, 71*0Sstevel@tonic-gate DSA *dsa); 72*0Sstevel@tonic-gate static int dsa_init(DSA *dsa); 73*0Sstevel@tonic-gate static int dsa_finish(DSA *dsa); 74*0Sstevel@tonic-gate static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, 75*0Sstevel@tonic-gate BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx, 76*0Sstevel@tonic-gate BN_MONT_CTX *in_mont); 77*0Sstevel@tonic-gate static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p, 78*0Sstevel@tonic-gate const BIGNUM *m, BN_CTX *ctx, 79*0Sstevel@tonic-gate BN_MONT_CTX *m_ctx); 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate static DSA_METHOD openssl_dsa_meth = { 82*0Sstevel@tonic-gate "OpenSSL DSA method", 83*0Sstevel@tonic-gate dsa_do_sign, 84*0Sstevel@tonic-gate dsa_sign_setup, 85*0Sstevel@tonic-gate dsa_do_verify, 86*0Sstevel@tonic-gate dsa_mod_exp, 87*0Sstevel@tonic-gate dsa_bn_mod_exp, 88*0Sstevel@tonic-gate dsa_init, 89*0Sstevel@tonic-gate dsa_finish, 90*0Sstevel@tonic-gate 0, 91*0Sstevel@tonic-gate NULL 92*0Sstevel@tonic-gate }; 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate const DSA_METHOD *DSA_OpenSSL(void) 95*0Sstevel@tonic-gate { 96*0Sstevel@tonic-gate return &openssl_dsa_meth; 97*0Sstevel@tonic-gate } 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa) 100*0Sstevel@tonic-gate { 101*0Sstevel@tonic-gate BIGNUM *kinv=NULL,*r=NULL,*s=NULL; 102*0Sstevel@tonic-gate BIGNUM m; 103*0Sstevel@tonic-gate BIGNUM xr; 104*0Sstevel@tonic-gate BN_CTX *ctx=NULL; 105*0Sstevel@tonic-gate int i,reason=ERR_R_BN_LIB; 106*0Sstevel@tonic-gate DSA_SIG *ret=NULL; 107*0Sstevel@tonic-gate 108*0Sstevel@tonic-gate BN_init(&m); 109*0Sstevel@tonic-gate BN_init(&xr); 110*0Sstevel@tonic-gate 111*0Sstevel@tonic-gate if (!dsa->p || !dsa->q || !dsa->g) 112*0Sstevel@tonic-gate { 113*0Sstevel@tonic-gate reason=DSA_R_MISSING_PARAMETERS; 114*0Sstevel@tonic-gate goto err; 115*0Sstevel@tonic-gate } 116*0Sstevel@tonic-gate 117*0Sstevel@tonic-gate s=BN_new(); 118*0Sstevel@tonic-gate if (s == NULL) goto err; 119*0Sstevel@tonic-gate 120*0Sstevel@tonic-gate i=BN_num_bytes(dsa->q); /* should be 20 */ 121*0Sstevel@tonic-gate if ((dlen > i) || (dlen > 50)) 122*0Sstevel@tonic-gate { 123*0Sstevel@tonic-gate reason=DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE; 124*0Sstevel@tonic-gate goto err; 125*0Sstevel@tonic-gate } 126*0Sstevel@tonic-gate 127*0Sstevel@tonic-gate ctx=BN_CTX_new(); 128*0Sstevel@tonic-gate if (ctx == NULL) goto err; 129*0Sstevel@tonic-gate 130*0Sstevel@tonic-gate if ((dsa->kinv == NULL) || (dsa->r == NULL)) 131*0Sstevel@tonic-gate { 132*0Sstevel@tonic-gate if (!DSA_sign_setup(dsa,ctx,&kinv,&r)) goto err; 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate else 135*0Sstevel@tonic-gate { 136*0Sstevel@tonic-gate kinv=dsa->kinv; 137*0Sstevel@tonic-gate dsa->kinv=NULL; 138*0Sstevel@tonic-gate r=dsa->r; 139*0Sstevel@tonic-gate dsa->r=NULL; 140*0Sstevel@tonic-gate } 141*0Sstevel@tonic-gate 142*0Sstevel@tonic-gate if (BN_bin2bn(dgst,dlen,&m) == NULL) goto err; 143*0Sstevel@tonic-gate 144*0Sstevel@tonic-gate /* Compute s = inv(k) (m + xr) mod q */ 145*0Sstevel@tonic-gate if (!BN_mod_mul(&xr,dsa->priv_key,r,dsa->q,ctx)) goto err;/* s = xr */ 146*0Sstevel@tonic-gate if (!BN_add(s, &xr, &m)) goto err; /* s = m + xr */ 147*0Sstevel@tonic-gate if (BN_cmp(s,dsa->q) > 0) 148*0Sstevel@tonic-gate BN_sub(s,s,dsa->q); 149*0Sstevel@tonic-gate if (!BN_mod_mul(s,s,kinv,dsa->q,ctx)) goto err; 150*0Sstevel@tonic-gate 151*0Sstevel@tonic-gate ret=DSA_SIG_new(); 152*0Sstevel@tonic-gate if (ret == NULL) goto err; 153*0Sstevel@tonic-gate ret->r = r; 154*0Sstevel@tonic-gate ret->s = s; 155*0Sstevel@tonic-gate 156*0Sstevel@tonic-gate err: 157*0Sstevel@tonic-gate if (!ret) 158*0Sstevel@tonic-gate { 159*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_DO_SIGN,reason); 160*0Sstevel@tonic-gate BN_free(r); 161*0Sstevel@tonic-gate BN_free(s); 162*0Sstevel@tonic-gate } 163*0Sstevel@tonic-gate if (ctx != NULL) BN_CTX_free(ctx); 164*0Sstevel@tonic-gate BN_clear_free(&m); 165*0Sstevel@tonic-gate BN_clear_free(&xr); 166*0Sstevel@tonic-gate if (kinv != NULL) /* dsa->kinv is NULL now if we used it */ 167*0Sstevel@tonic-gate BN_clear_free(kinv); 168*0Sstevel@tonic-gate return(ret); 169*0Sstevel@tonic-gate } 170*0Sstevel@tonic-gate 171*0Sstevel@tonic-gate static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp) 172*0Sstevel@tonic-gate { 173*0Sstevel@tonic-gate BN_CTX *ctx; 174*0Sstevel@tonic-gate BIGNUM k,*kinv=NULL,*r=NULL; 175*0Sstevel@tonic-gate int ret=0; 176*0Sstevel@tonic-gate 177*0Sstevel@tonic-gate if (!dsa->p || !dsa->q || !dsa->g) 178*0Sstevel@tonic-gate { 179*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_SIGN_SETUP,DSA_R_MISSING_PARAMETERS); 180*0Sstevel@tonic-gate return 0; 181*0Sstevel@tonic-gate } 182*0Sstevel@tonic-gate 183*0Sstevel@tonic-gate BN_init(&k); 184*0Sstevel@tonic-gate 185*0Sstevel@tonic-gate if (ctx_in == NULL) 186*0Sstevel@tonic-gate { 187*0Sstevel@tonic-gate if ((ctx=BN_CTX_new()) == NULL) goto err; 188*0Sstevel@tonic-gate } 189*0Sstevel@tonic-gate else 190*0Sstevel@tonic-gate ctx=ctx_in; 191*0Sstevel@tonic-gate 192*0Sstevel@tonic-gate if ((r=BN_new()) == NULL) goto err; 193*0Sstevel@tonic-gate kinv=NULL; 194*0Sstevel@tonic-gate 195*0Sstevel@tonic-gate /* Get random k */ 196*0Sstevel@tonic-gate do 197*0Sstevel@tonic-gate if (!BN_rand_range(&k, dsa->q)) goto err; 198*0Sstevel@tonic-gate while (BN_is_zero(&k)); 199*0Sstevel@tonic-gate 200*0Sstevel@tonic-gate if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P)) 201*0Sstevel@tonic-gate { 202*0Sstevel@tonic-gate if ((dsa->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL) 203*0Sstevel@tonic-gate if (!BN_MONT_CTX_set((BN_MONT_CTX *)dsa->method_mont_p, 204*0Sstevel@tonic-gate dsa->p,ctx)) goto err; 205*0Sstevel@tonic-gate } 206*0Sstevel@tonic-gate 207*0Sstevel@tonic-gate /* Compute r = (g^k mod p) mod q */ 208*0Sstevel@tonic-gate if (!dsa->meth->bn_mod_exp(dsa, r,dsa->g,&k,dsa->p,ctx, 209*0Sstevel@tonic-gate (BN_MONT_CTX *)dsa->method_mont_p)) goto err; 210*0Sstevel@tonic-gate if (!BN_mod(r,r,dsa->q,ctx)) goto err; 211*0Sstevel@tonic-gate 212*0Sstevel@tonic-gate /* Compute part of 's = inv(k) (m + xr) mod q' */ 213*0Sstevel@tonic-gate if ((kinv=BN_mod_inverse(NULL,&k,dsa->q,ctx)) == NULL) goto err; 214*0Sstevel@tonic-gate 215*0Sstevel@tonic-gate if (*kinvp != NULL) BN_clear_free(*kinvp); 216*0Sstevel@tonic-gate *kinvp=kinv; 217*0Sstevel@tonic-gate kinv=NULL; 218*0Sstevel@tonic-gate if (*rp != NULL) BN_clear_free(*rp); 219*0Sstevel@tonic-gate *rp=r; 220*0Sstevel@tonic-gate ret=1; 221*0Sstevel@tonic-gate err: 222*0Sstevel@tonic-gate if (!ret) 223*0Sstevel@tonic-gate { 224*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_SIGN_SETUP,ERR_R_BN_LIB); 225*0Sstevel@tonic-gate if (kinv != NULL) BN_clear_free(kinv); 226*0Sstevel@tonic-gate if (r != NULL) BN_clear_free(r); 227*0Sstevel@tonic-gate } 228*0Sstevel@tonic-gate if (ctx_in == NULL) BN_CTX_free(ctx); 229*0Sstevel@tonic-gate if (kinv != NULL) BN_clear_free(kinv); 230*0Sstevel@tonic-gate BN_clear_free(&k); 231*0Sstevel@tonic-gate return(ret); 232*0Sstevel@tonic-gate } 233*0Sstevel@tonic-gate 234*0Sstevel@tonic-gate static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig, 235*0Sstevel@tonic-gate DSA *dsa) 236*0Sstevel@tonic-gate { 237*0Sstevel@tonic-gate BN_CTX *ctx; 238*0Sstevel@tonic-gate BIGNUM u1,u2,t1; 239*0Sstevel@tonic-gate BN_MONT_CTX *mont=NULL; 240*0Sstevel@tonic-gate int ret = -1; 241*0Sstevel@tonic-gate if (!dsa->p || !dsa->q || !dsa->g) 242*0Sstevel@tonic-gate { 243*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_MISSING_PARAMETERS); 244*0Sstevel@tonic-gate return -1; 245*0Sstevel@tonic-gate } 246*0Sstevel@tonic-gate 247*0Sstevel@tonic-gate BN_init(&u1); 248*0Sstevel@tonic-gate BN_init(&u2); 249*0Sstevel@tonic-gate BN_init(&t1); 250*0Sstevel@tonic-gate 251*0Sstevel@tonic-gate if ((ctx=BN_CTX_new()) == NULL) goto err; 252*0Sstevel@tonic-gate 253*0Sstevel@tonic-gate if (BN_is_zero(sig->r) || sig->r->neg || BN_ucmp(sig->r, dsa->q) >= 0) 254*0Sstevel@tonic-gate { 255*0Sstevel@tonic-gate ret = 0; 256*0Sstevel@tonic-gate goto err; 257*0Sstevel@tonic-gate } 258*0Sstevel@tonic-gate if (BN_is_zero(sig->s) || sig->s->neg || BN_ucmp(sig->s, dsa->q) >= 0) 259*0Sstevel@tonic-gate { 260*0Sstevel@tonic-gate ret = 0; 261*0Sstevel@tonic-gate goto err; 262*0Sstevel@tonic-gate } 263*0Sstevel@tonic-gate 264*0Sstevel@tonic-gate /* Calculate W = inv(S) mod Q 265*0Sstevel@tonic-gate * save W in u2 */ 266*0Sstevel@tonic-gate if ((BN_mod_inverse(&u2,sig->s,dsa->q,ctx)) == NULL) goto err; 267*0Sstevel@tonic-gate 268*0Sstevel@tonic-gate /* save M in u1 */ 269*0Sstevel@tonic-gate if (BN_bin2bn(dgst,dgst_len,&u1) == NULL) goto err; 270*0Sstevel@tonic-gate 271*0Sstevel@tonic-gate /* u1 = M * w mod q */ 272*0Sstevel@tonic-gate if (!BN_mod_mul(&u1,&u1,&u2,dsa->q,ctx)) goto err; 273*0Sstevel@tonic-gate 274*0Sstevel@tonic-gate /* u2 = r * w mod q */ 275*0Sstevel@tonic-gate if (!BN_mod_mul(&u2,sig->r,&u2,dsa->q,ctx)) goto err; 276*0Sstevel@tonic-gate 277*0Sstevel@tonic-gate if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P)) 278*0Sstevel@tonic-gate { 279*0Sstevel@tonic-gate if ((dsa->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL) 280*0Sstevel@tonic-gate if (!BN_MONT_CTX_set((BN_MONT_CTX *)dsa->method_mont_p, 281*0Sstevel@tonic-gate dsa->p,ctx)) goto err; 282*0Sstevel@tonic-gate } 283*0Sstevel@tonic-gate mont=(BN_MONT_CTX *)dsa->method_mont_p; 284*0Sstevel@tonic-gate 285*0Sstevel@tonic-gate #if 0 286*0Sstevel@tonic-gate { 287*0Sstevel@tonic-gate BIGNUM t2; 288*0Sstevel@tonic-gate 289*0Sstevel@tonic-gate BN_init(&t2); 290*0Sstevel@tonic-gate /* v = ( g^u1 * y^u2 mod p ) mod q */ 291*0Sstevel@tonic-gate /* let t1 = g ^ u1 mod p */ 292*0Sstevel@tonic-gate if (!BN_mod_exp_mont(&t1,dsa->g,&u1,dsa->p,ctx,mont)) goto err; 293*0Sstevel@tonic-gate /* let t2 = y ^ u2 mod p */ 294*0Sstevel@tonic-gate if (!BN_mod_exp_mont(&t2,dsa->pub_key,&u2,dsa->p,ctx,mont)) goto err; 295*0Sstevel@tonic-gate /* let u1 = t1 * t2 mod p */ 296*0Sstevel@tonic-gate if (!BN_mod_mul(&u1,&t1,&t2,dsa->p,ctx)) goto err_bn; 297*0Sstevel@tonic-gate BN_free(&t2); 298*0Sstevel@tonic-gate } 299*0Sstevel@tonic-gate /* let u1 = u1 mod q */ 300*0Sstevel@tonic-gate if (!BN_mod(&u1,&u1,dsa->q,ctx)) goto err; 301*0Sstevel@tonic-gate #else 302*0Sstevel@tonic-gate { 303*0Sstevel@tonic-gate if (!dsa->meth->dsa_mod_exp(dsa, &t1,dsa->g,&u1,dsa->pub_key,&u2, 304*0Sstevel@tonic-gate dsa->p,ctx,mont)) goto err; 305*0Sstevel@tonic-gate /* BN_copy(&u1,&t1); */ 306*0Sstevel@tonic-gate /* let u1 = u1 mod q */ 307*0Sstevel@tonic-gate if (!BN_mod(&u1,&t1,dsa->q,ctx)) goto err; 308*0Sstevel@tonic-gate } 309*0Sstevel@tonic-gate #endif 310*0Sstevel@tonic-gate /* V is now in u1. If the signature is correct, it will be 311*0Sstevel@tonic-gate * equal to R. */ 312*0Sstevel@tonic-gate ret=(BN_ucmp(&u1, sig->r) == 0); 313*0Sstevel@tonic-gate 314*0Sstevel@tonic-gate err: 315*0Sstevel@tonic-gate if (ret != 1) DSAerr(DSA_F_DSA_DO_VERIFY,ERR_R_BN_LIB); 316*0Sstevel@tonic-gate if (ctx != NULL) BN_CTX_free(ctx); 317*0Sstevel@tonic-gate BN_free(&u1); 318*0Sstevel@tonic-gate BN_free(&u2); 319*0Sstevel@tonic-gate BN_free(&t1); 320*0Sstevel@tonic-gate return(ret); 321*0Sstevel@tonic-gate } 322*0Sstevel@tonic-gate 323*0Sstevel@tonic-gate static int dsa_init(DSA *dsa) 324*0Sstevel@tonic-gate { 325*0Sstevel@tonic-gate dsa->flags|=DSA_FLAG_CACHE_MONT_P; 326*0Sstevel@tonic-gate return(1); 327*0Sstevel@tonic-gate } 328*0Sstevel@tonic-gate 329*0Sstevel@tonic-gate static int dsa_finish(DSA *dsa) 330*0Sstevel@tonic-gate { 331*0Sstevel@tonic-gate if(dsa->method_mont_p) 332*0Sstevel@tonic-gate BN_MONT_CTX_free((BN_MONT_CTX *)dsa->method_mont_p); 333*0Sstevel@tonic-gate return(1); 334*0Sstevel@tonic-gate } 335*0Sstevel@tonic-gate 336*0Sstevel@tonic-gate static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, 337*0Sstevel@tonic-gate BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx, 338*0Sstevel@tonic-gate BN_MONT_CTX *in_mont) 339*0Sstevel@tonic-gate { 340*0Sstevel@tonic-gate return BN_mod_exp2_mont(rr, a1, p1, a2, p2, m, ctx, in_mont); 341*0Sstevel@tonic-gate } 342*0Sstevel@tonic-gate 343*0Sstevel@tonic-gate static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p, 344*0Sstevel@tonic-gate const BIGNUM *m, BN_CTX *ctx, 345*0Sstevel@tonic-gate BN_MONT_CTX *m_ctx) 346*0Sstevel@tonic-gate { 347*0Sstevel@tonic-gate return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx); 348*0Sstevel@tonic-gate } 349