crypto/dsa/dsa_ameth.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/x509.h>
  62 #include <openssl/asn1.h>
  63 #include <openssl/dsa.h>
  64 #include <openssl/bn.h>
  65 #ifndef OPENSSL_NO_CMS
  66 # include <openssl/cms.h>
  67 #endif
  68 #include "internal/asn1_int.h"
  69
  70 static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  71 {
  72     const unsigned char *p, *pm;
  73     int pklen, pmlen;
  74     int ptype;
  75     void *pval;
  76     ASN1_STRING *pstr;
  77     X509_ALGOR *palg;
  78     ASN1_INTEGER *public_key = NULL;
  79
  80     DSA *dsa = NULL;
  81
  82     if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
  83         return 0;
  84     X509_ALGOR_get0(NULL, &ptype, &pval, palg);
  85
  86     if (ptype == V_ASN1_SEQUENCE) {
  87         pstr = pval;
  88         pm = pstr->data;
  89         pmlen = pstr->length;
  90
  91         if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) {
  92             DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
  93             goto err;
  94         }
  95
  96     } else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF)) {
  97         if ((dsa = DSA_new()) == NULL) {
  98             DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
  99             goto err;
 100         }
 101     } else {
 102         DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
 103         goto err;
 104     }
 105
 106     if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
 107         DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
 108         goto err;
 109     }
 110
 111     if ((dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
 112         DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
 113         goto err;
 114     }
 115
 116     ASN1_INTEGER_free(public_key);
 117     EVP_PKEY_assign_DSA(pkey, dsa);
 118     return 1;
 119
 120  err:
 121     ASN1_INTEGER_free(public_key);
 122     DSA_free(dsa);
 123     return 0;
 124
 125 }
 126
 127 static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
 128 {
 129     DSA *dsa;
 130     int ptype;
 131     unsigned char *penc = NULL;
 132     int penclen;
 133     ASN1_STRING *str = NULL;
 134     ASN1_INTEGER *pubint = NULL;
 135
 136     dsa = pkey->pkey.dsa;
 137     if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
 138         str = ASN1_STRING_new();
 139         if (!str) {
 140             DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 141             goto err;
 142         }
 143         str->length = i2d_DSAparams(dsa, &str->data);
 144         if (str->length <= 0) {
 145             DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 146             goto err;
 147         }
 148         ptype = V_ASN1_SEQUENCE;
 149     } else
 150         ptype = V_ASN1_UNDEF;
 151
 152     pubint = BN_to_ASN1_INTEGER(dsa->pub_key, NULL);
 153
 154     if (pubint == NULL) {
 155         DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 156         goto err;
 157     }
 158
 159     penclen = i2d_ASN1_INTEGER(pubint, &penc);
 160     ASN1_INTEGER_free(pubint);
 161
 162     if (penclen <= 0) {
 163         DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 164         goto err;
 165     }
 166
 167     if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
 168                                ptype, str, penc, penclen))
 169         return 1;
 170
 171  err:
 172     OPENSSL_free(penc);
 173     ASN1_STRING_free(str);
 174
 175     return 0;
 176 }
 177
 178 /*
 179  * In PKCS#8 DSA: you just get a private key integer and parameters in the
 180  * AlgorithmIdentifier the pubkey must be recalculated.
 181  */
 182
 183 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 184 {
 185     const unsigned char *p, *pm;
 186     int pklen, pmlen;
 187     int ptype;
 188     void *pval;
 189     ASN1_STRING *pstr;
 190     X509_ALGOR *palg;
 191     ASN1_INTEGER *privkey = NULL;
 192     BN_CTX *ctx = NULL;
 193
 194     STACK_OF(ASN1_TYPE) *ndsa = NULL;
 195     DSA *dsa = NULL;
 196
 197     if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 198         return 0;
 199     X509_ALGOR_get0(NULL, &ptype, &pval, palg);
 200
 201     /* Check for broken DSA PKCS#8, UGH! */
 202     if (*p == (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
 203         ASN1_TYPE *t1, *t2;
 204         if ((ndsa = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen)) == NULL)
 205             goto decerr;
 206         if (sk_ASN1_TYPE_num(ndsa) != 2)
 207             goto decerr;
 208         /*-
 209          * Handle Two broken types:
 210          * SEQUENCE {parameters, priv_key}
 211          * SEQUENCE {pub_key, priv_key}
 212          */
 213
 214         t1 = sk_ASN1_TYPE_value(ndsa, 0);
 215         t2 = sk_ASN1_TYPE_value(ndsa, 1);
 216         if (t1->type == V_ASN1_SEQUENCE) {
 217             p8->broken = PKCS8_EMBEDDED_PARAM;
 218             pval = t1->value.ptr;
 219         } else if (ptype == V_ASN1_SEQUENCE)
 220             p8->broken = PKCS8_NS_DB;
 221         else
 222             goto decerr;
 223
 224         if (t2->type != V_ASN1_INTEGER)
 225             goto decerr;
 226
 227         privkey = t2->value.integer;
 228     } else {
 229         const unsigned char *q = p;
 230         if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
 231             goto decerr;
 232         if (privkey->type == V_ASN1_NEG_INTEGER) {
 233             p8->broken = PKCS8_NEG_PRIVKEY;
 234             ASN1_STRING_clear_free(privkey);
 235             if ((privkey = d2i_ASN1_UINTEGER(NULL, &q, pklen)) == NULL)
 236                 goto decerr;
 237         }
 238         if (ptype != V_ASN1_SEQUENCE)
 239             goto decerr;
 240     }
 241
 242     pstr = pval;
 243     pm = pstr->data;
 244     pmlen = pstr->length;
 245     if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL)
 246         goto decerr;
 247     /* We have parameters now set private key */
 248     if ((dsa->priv_key = BN_secure_new()) == NULL
 249         || !ASN1_INTEGER_to_BN(privkey, dsa->priv_key)) {
 250         DSAerr(DSA_F_DSA_PRIV_DECODE, DSA_R_BN_ERROR);
 251         goto dsaerr;
 252     }
 253     /* Calculate public key */
 254     if ((dsa->pub_key = BN_new()) == NULL) {
 255         DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 256         goto dsaerr;
 257     }
 258     if ((ctx = BN_CTX_new()) == NULL) {
 259         DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
 260         goto dsaerr;
 261     }
 262
 263     if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
 264         DSAerr(DSA_F_DSA_PRIV_DECODE, DSA_R_BN_ERROR);
 265         goto dsaerr;
 266     }
 267
 268     EVP_PKEY_assign_DSA(pkey, dsa);
 269     BN_CTX_free(ctx);
 270     if (ndsa)
 271         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 272     else
 273         ASN1_STRING_clear_free(privkey);
 274
 275     return 1;
 276
 277  decerr:
 278     DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
 279  dsaerr:
 280     BN_CTX_free(ctx);
 281     ASN1_STRING_clear_free(privkey);
 282     sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 283     DSA_free(dsa);
 284     return 0;
 285 }
 286
 287 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 288 {
 289     ASN1_STRING *params = NULL;
 290     ASN1_INTEGER *prkey = NULL;
 291     unsigned char *dp = NULL;
 292     int dplen;
 293
 294     if (!pkey->pkey.dsa || !pkey->pkey.dsa->priv_key) {
 295         DSAerr(DSA_F_DSA_PRIV_ENCODE, DSA_R_MISSING_PARAMETERS);
 296         goto err;
 297     }
 298
 299     params = ASN1_STRING_new();
 300
 301     if (!params) {
 302         DSAerr(DSA_F_DSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
 303         goto err;
 304     }
 305
 306     params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
 307     if (params->length <= 0) {
 308         DSAerr(DSA_F_DSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
 309         goto err;
 310     }
 311     params->type = V_ASN1_SEQUENCE;
 312
 313     /* Get private key into integer */
 314     prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
 315
 316     if (!prkey) {
 317         DSAerr(DSA_F_DSA_PRIV_ENCODE, DSA_R_BN_ERROR);
 318         goto err;
 319     }
 320
 321     dplen = i2d_ASN1_INTEGER(prkey, &dp);
 322
 323     ASN1_STRING_clear_free(prkey);
 324
 325     if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
 326                          V_ASN1_SEQUENCE, params, dp, dplen))
 327         goto err;
 328
 329     return 1;
 330
 331  err:
 332     OPENSSL_free(dp);
 333     ASN1_STRING_free(params);
 334     ASN1_STRING_clear_free(prkey);
 335     return 0;
 336 }
 337
 338 static int int_dsa_size(const EVP_PKEY *pkey)
 339 {
 340     return (DSA_size(pkey->pkey.dsa));
 341 }
 342
 343 static int dsa_bits(const EVP_PKEY *pkey)
 344 {
 345     return BN_num_bits(pkey->pkey.dsa->p);
 346 }
 347
 348 static int dsa_security_bits(const EVP_PKEY *pkey)
 349 {
 350     return DSA_security_bits(pkey->pkey.dsa);
 351 }
 352
 353 static int dsa_missing_parameters(const EVP_PKEY *pkey)
 354 {
 355     DSA *dsa;
 356     dsa = pkey->pkey.dsa;
 357     if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
 358         return 1;
 359     return 0;
 360 }
 361
 362 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 363 {
 364     BIGNUM *a;
 365
 366     if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
 367         return 0;
 368     BN_free(to->pkey.dsa->p);
 369     to->pkey.dsa->p = a;
 370
 371     if ((a = BN_dup(from->pkey.dsa->q)) == NULL)
 372         return 0;
 373     BN_free(to->pkey.dsa->q);
 374     to->pkey.dsa->q = a;
 375
 376     if ((a = BN_dup(from->pkey.dsa->g)) == NULL)
 377         return 0;
 378     BN_free(to->pkey.dsa->g);
 379     to->pkey.dsa->g = a;
 380     return 1;
 381 }
 382
 383 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 384 {
 385     if (BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) ||
 386         BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) ||
 387         BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g))
 388         return 0;
 389     else
 390         return 1;
 391 }
 392
 393 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 394 {
 395     if (BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) != 0)
 396         return 0;
 397     else
 398         return 1;
 399 }
 400
 401 static void int_dsa_free(EVP_PKEY *pkey)
 402 {
 403     DSA_free(pkey->pkey.dsa);
 404 }
 405
 406 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 407 {
 408     size_t i;
 409     if (!b)
 410         return;
 411     if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 412         *pbuflen = i;
 413 }
 414
 415 static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
 416 {
 417     unsigned char *m = NULL;
 418     int ret = 0;
 419     size_t buf_len = 0;
 420     const char *ktype = NULL;
 421
 422     const BIGNUM *priv_key, *pub_key;
 423
 424     if (ptype == 2)
 425         priv_key = x->priv_key;
 426     else
 427         priv_key = NULL;
 428
 429     if (ptype > 0)
 430         pub_key = x->pub_key;
 431     else
 432         pub_key = NULL;
 433
 434     if (ptype == 2)
 435         ktype = "Private-Key";
 436     else if (ptype == 1)
 437         ktype = "Public-Key";
 438     else
 439         ktype = "DSA-Parameters";
 440
 441     update_buflen(x->p, &buf_len);
 442     update_buflen(x->q, &buf_len);
 443     update_buflen(x->g, &buf_len);
 444     update_buflen(priv_key, &buf_len);
 445     update_buflen(pub_key, &buf_len);
 446
 447     m = OPENSSL_malloc(buf_len + 10);
 448     if (m == NULL) {
 449         DSAerr(DSA_F_DO_DSA_PRINT, ERR_R_MALLOC_FAILURE);
 450         goto err;
 451     }
 452
 453     if (priv_key) {
 454         if (!BIO_indent(bp, off, 128))
 455             goto err;
 456         if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p))
 457             <= 0)
 458             goto err;
 459     }
 460
 461     if (!ASN1_bn_print(bp, "priv:", priv_key, m, off))
 462         goto err;
 463     if (!ASN1_bn_print(bp, "pub: ", pub_key, m, off))
 464         goto err;
 465     if (!ASN1_bn_print(bp, "P:   ", x->p, m, off))
 466         goto err;
 467     if (!ASN1_bn_print(bp, "Q:   ", x->q, m, off))
 468         goto err;
 469     if (!ASN1_bn_print(bp, "G:   ", x->g, m, off))
 470         goto err;
 471     ret = 1;
 472  err:
 473     OPENSSL_free(m);
 474     return (ret);
 475 }
 476
 477 static int dsa_param_decode(EVP_PKEY *pkey,
 478                             const unsigned char **pder, int derlen)
 479 {
 480     DSA *dsa;
 481
 482     if ((dsa = d2i_DSAparams(NULL, pder, derlen)) == NULL) {
 483         DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
 484         return 0;
 485     }
 486     EVP_PKEY_assign_DSA(pkey, dsa);
 487     return 1;
 488 }
 489
 490 static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 491 {
 492     return i2d_DSAparams(pkey->pkey.dsa, pder);
 493 }
 494
 495 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 496                            ASN1_PCTX *ctx)
 497 {
 498     return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
 499 }
 500
 501 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 502                          ASN1_PCTX *ctx)
 503 {
 504     return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
 505 }
 506
 507 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 508                           ASN1_PCTX *ctx)
 509 {
 510     return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
 511 }
 512
 513 static int old_dsa_priv_decode(EVP_PKEY *pkey,
 514                                const unsigned char **pder, int derlen)
 515 {
 516     DSA *dsa;
 517
 518     if ((dsa = d2i_DSAPrivateKey(NULL, pder, derlen)) == NULL) {
 519         DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
 520         return 0;
 521     }
 522     EVP_PKEY_assign_DSA(pkey, dsa);
 523     return 1;
 524 }
 525
 526 static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 527 {
 528     return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
 529 }
 530
 531 static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
 532                          const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
 533 {
 534     DSA_SIG *dsa_sig;
 535     const unsigned char *p;
 536     if (!sig) {
 537         if (BIO_puts(bp, "\n") <= 0)
 538             return 0;
 539         else
 540             return 1;
 541     }
 542     p = sig->data;
 543     dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
 544     if (dsa_sig) {
 545         int rv = 0;
 546         size_t buf_len = 0;
 547         unsigned char *m = NULL;
 548         update_buflen(dsa_sig->r, &buf_len);
 549         update_buflen(dsa_sig->s, &buf_len);
 550         m = OPENSSL_malloc(buf_len + 10);
 551         if (m == NULL) {
 552             DSAerr(DSA_F_DSA_SIG_PRINT, ERR_R_MALLOC_FAILURE);
 553             goto err;
 554         }
 555
 556         if (BIO_write(bp, "\n", 1) != 1)
 557             goto err;
 558
 559         if (!ASN1_bn_print(bp, "r:   ", dsa_sig->r, m, indent))
 560             goto err;
 561         if (!ASN1_bn_print(bp, "s:   ", dsa_sig->s, m, indent))
 562             goto err;
 563         rv = 1;
 564  err:
 565         OPENSSL_free(m);
 566         DSA_SIG_free(dsa_sig);
 567         return rv;
 568     }
 569     return X509_signature_dump(bp, sig, indent);
 570 }
 571
 572 static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 573 {
 574     switch (op) {
 575     case ASN1_PKEY_CTRL_PKCS7_SIGN:
 576         if (arg1 == 0) {
 577             int snid, hnid;
 578             X509_ALGOR *alg1, *alg2;
 579             PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
 580             if (alg1 == NULL || alg1->algorithm == NULL)
 581                 return -1;
 582             hnid = OBJ_obj2nid(alg1->algorithm);
 583             if (hnid == NID_undef)
 584                 return -1;
 585             if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
 586                 return -1;
 587             X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
 588         }
 589         return 1;
 590 #ifndef OPENSSL_NO_CMS
 591     case ASN1_PKEY_CTRL_CMS_SIGN:
 592         if (arg1 == 0) {
 593             int snid, hnid;
 594             X509_ALGOR *alg1, *alg2;
 595             CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
 596             if (alg1 == NULL || alg1->algorithm == NULL)
 597                 return -1;
 598             hnid = OBJ_obj2nid(alg1->algorithm);
 599             if (hnid == NID_undef)
 600                 return -1;
 601             if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
 602                 return -1;
 603             X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
 604         }
 605         return 1;
 606
 607     case ASN1_PKEY_CTRL_CMS_RI_TYPE:
 608         *(int *)arg2 = CMS_RECIPINFO_NONE;
 609         return 1;
 610 #endif
 611
 612     case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 613         *(int *)arg2 = NID_sha256;
 614         return 2;
 615
 616     default:
 617         return -2;
 618
 619     }
 620
 621 }
 622
 623 /* NB these are sorted in pkey_id order, lowest first */
 624
 625 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = {
 626
 627     {
 628      EVP_PKEY_DSA2,
 629      EVP_PKEY_DSA,
 630      ASN1_PKEY_ALIAS},
 631
 632     {
 633      EVP_PKEY_DSA1,
 634      EVP_PKEY_DSA,
 635      ASN1_PKEY_ALIAS},
 636
 637     {
 638      EVP_PKEY_DSA4,
 639      EVP_PKEY_DSA,
 640      ASN1_PKEY_ALIAS},
 641
 642     {
 643      EVP_PKEY_DSA3,
 644      EVP_PKEY_DSA,
 645      ASN1_PKEY_ALIAS},
 646
 647     {
 648      EVP_PKEY_DSA,
 649      EVP_PKEY_DSA,
 650      0,
 651
 652      "DSA",
 653      "OpenSSL DSA method",
 654
 655      dsa_pub_decode,
 656      dsa_pub_encode,
 657      dsa_pub_cmp,
 658      dsa_pub_print,
 659
 660      dsa_priv_decode,
 661      dsa_priv_encode,
 662      dsa_priv_print,
 663
 664      int_dsa_size,
 665      dsa_bits,
 666      dsa_security_bits,
 667
 668      dsa_param_decode,
 669      dsa_param_encode,
 670      dsa_missing_parameters,
 671      dsa_copy_parameters,
 672      dsa_cmp_parameters,
 673      dsa_param_print,
 674      dsa_sig_print,
 675
 676      int_dsa_free,
 677      dsa_pkey_ctrl,
 678      old_dsa_priv_decode,
 679      old_dsa_priv_encode}
 680 };