crypto/evp/pmeth_lib.c

   1 /* pmeth_lib.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2006.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include "internal/cryptlib.h"
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65 #ifndef OPENSSL_NO_ENGINE
  66 # include <openssl/engine.h>
  67 #endif
  68 #include "internal/asn1_int.h"
  69 #include "internal/evp_int.h"
  70
  71 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
  72
  73 DECLARE_STACK_OF(EVP_PKEY_METHOD)
  74 STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
  75
  76 extern const EVP_PKEY_METHOD rsa_pkey_meth, dh_pkey_meth, dsa_pkey_meth;
  77 extern const EVP_PKEY_METHOD ec_pkey_meth, hmac_pkey_meth, cmac_pkey_meth;
  78 extern const EVP_PKEY_METHOD dhx_pkey_meth;
  79
  80 static const EVP_PKEY_METHOD *standard_methods[] = {
  81 #ifndef OPENSSL_NO_RSA
  82     &rsa_pkey_meth,
  83 #endif
  84 #ifndef OPENSSL_NO_DH
  85     &dh_pkey_meth,
  86 #endif
  87 #ifndef OPENSSL_NO_DSA
  88     &dsa_pkey_meth,
  89 #endif
  90 #ifndef OPENSSL_NO_EC
  91     &ec_pkey_meth,
  92 #endif
  93     &hmac_pkey_meth,
  94     &cmac_pkey_meth,
  95 #ifndef OPENSSL_NO_DH
  96     &dhx_pkey_meth
  97 #endif
  98 };
  99
 100 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
 101                            pmeth);
 102
 103 static int pmeth_cmp(const EVP_PKEY_METHOD *const *a,
 104                      const EVP_PKEY_METHOD *const *b)
 105 {
 106     return ((*a)->pkey_id - (*b)->pkey_id);
 107 }
 108
 109 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
 110                              pmeth);
 111
 112 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
 113 {
 114     EVP_PKEY_METHOD tmp;
 115     const EVP_PKEY_METHOD *t = &tmp, **ret;
 116     tmp.pkey_id = type;
 117     if (app_pkey_methods) {
 118         int idx;
 119         idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
 120         if (idx >= 0)
 121             return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
 122     }
 123     ret = OBJ_bsearch_pmeth(&t, standard_methods,
 124                             sizeof(standard_methods) /
 125                             sizeof(EVP_PKEY_METHOD *));
 126     if (!ret || !*ret)
 127         return NULL;
 128     return *ret;
 129 }
 130
 131 static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
 132 {
 133     EVP_PKEY_CTX *ret;
 134     const EVP_PKEY_METHOD *pmeth;
 135     if (id == -1) {
 136         if (!pkey || !pkey->ameth)
 137             return NULL;
 138         id = pkey->ameth->pkey_id;
 139     }
 140 #ifndef OPENSSL_NO_ENGINE
 141     if (pkey && pkey->engine)
 142         e = pkey->engine;
 143     /* Try to find an ENGINE which implements this method */
 144     if (e) {
 145         if (!ENGINE_init(e)) {
 146             EVPerr(EVP_F_INT_CTX_NEW, ERR_R_ENGINE_LIB);
 147             return NULL;
 148         }
 149     } else
 150         e = ENGINE_get_pkey_meth_engine(id);
 151
 152     /*
 153      * If an ENGINE handled this method look it up. Othewise use internal
 154      * tables.
 155      */
 156
 157     if (e)
 158         pmeth = ENGINE_get_pkey_meth(e, id);
 159     else
 160 #endif
 161         pmeth = EVP_PKEY_meth_find(id);
 162
 163     if (pmeth == NULL) {
 164         EVPerr(EVP_F_INT_CTX_NEW, EVP_R_UNSUPPORTED_ALGORITHM);
 165         return NULL;
 166     }
 167
 168     ret = OPENSSL_zalloc(sizeof(*ret));
 169     if (!ret) {
 170 #ifndef OPENSSL_NO_ENGINE
 171         if (e)
 172             ENGINE_finish(e);
 173 #endif
 174         EVPerr(EVP_F_INT_CTX_NEW, ERR_R_MALLOC_FAILURE);
 175         return NULL;
 176     }
 177     ret->engine = e;
 178     ret->pmeth = pmeth;
 179     ret->operation = EVP_PKEY_OP_UNDEFINED;
 180     ret->pkey = pkey;
 181     if (pkey)
 182         CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 183     ret->data = NULL;
 184
 185     if (pmeth->init) {
 186         if (pmeth->init(ret) <= 0) {
 187             EVP_PKEY_CTX_free(ret);
 188             return NULL;
 189         }
 190     }
 191
 192     return ret;
 193 }
 194
 195 EVP_PKEY_METHOD *EVP_PKEY_meth_new(int id, int flags)
 196 {
 197     EVP_PKEY_METHOD *pmeth;
 198
 199     pmeth = OPENSSL_zalloc(sizeof(*pmeth));
 200     if (!pmeth)
 201         return NULL;
 202
 203     pmeth->pkey_id = id;
 204     pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 205     return pmeth;
 206 }
 207
 208 void EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags,
 209                              const EVP_PKEY_METHOD *meth)
 210 {
 211     if (ppkey_id)
 212         *ppkey_id = meth->pkey_id;
 213     if (pflags)
 214         *pflags = meth->flags;
 215 }
 216
 217 void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
 218 {
 219
 220     dst->init = src->init;
 221     dst->copy = src->copy;
 222     dst->cleanup = src->cleanup;
 223
 224     dst->paramgen_init = src->paramgen_init;
 225     dst->paramgen = src->paramgen;
 226
 227     dst->keygen_init = src->keygen_init;
 228     dst->keygen = src->keygen;
 229
 230     dst->sign_init = src->sign_init;
 231     dst->sign = src->sign;
 232
 233     dst->verify_init = src->verify_init;
 234     dst->verify = src->verify;
 235
 236     dst->verify_recover_init = src->verify_recover_init;
 237     dst->verify_recover = src->verify_recover;
 238
 239     dst->signctx_init = src->signctx_init;
 240     dst->signctx = src->signctx;
 241
 242     dst->verifyctx_init = src->verifyctx_init;
 243     dst->verifyctx = src->verifyctx;
 244
 245     dst->encrypt_init = src->encrypt_init;
 246     dst->encrypt = src->encrypt;
 247
 248     dst->decrypt_init = src->decrypt_init;
 249     dst->decrypt = src->decrypt;
 250
 251     dst->derive_init = src->derive_init;
 252     dst->derive = src->derive;
 253
 254     dst->ctrl = src->ctrl;
 255     dst->ctrl_str = src->ctrl_str;
 256 }
 257
 258 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 259 {
 260     if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 261         OPENSSL_free(pmeth);
 262 }
 263
 264 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 265 {
 266     return int_ctx_new(pkey, e, -1);
 267 }
 268
 269 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 270 {
 271     return int_ctx_new(NULL, e, id);
 272 }
 273
 274 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 275 {
 276     EVP_PKEY_CTX *rctx;
 277     if (!pctx->pmeth || !pctx->pmeth->copy)
 278         return NULL;
 279 #ifndef OPENSSL_NO_ENGINE
 280     /* Make sure it's safe to copy a pkey context using an ENGINE */
 281     if (pctx->engine && !ENGINE_init(pctx->engine)) {
 282         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
 283         return 0;
 284     }
 285 #endif
 286     rctx = OPENSSL_malloc(sizeof(*rctx));
 287     if (!rctx)
 288         return NULL;
 289
 290     rctx->pmeth = pctx->pmeth;
 291 #ifndef OPENSSL_NO_ENGINE
 292     rctx->engine = pctx->engine;
 293 #endif
 294
 295     if (pctx->pkey)
 296         CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 297
 298     rctx->pkey = pctx->pkey;
 299
 300     if (pctx->peerkey)
 301         CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 302
 303     rctx->peerkey = pctx->peerkey;
 304
 305     rctx->data = NULL;
 306     rctx->app_data = NULL;
 307     rctx->operation = pctx->operation;
 308
 309     if (pctx->pmeth->copy(rctx, pctx) > 0)
 310         return rctx;
 311
 312     EVP_PKEY_CTX_free(rctx);
 313     return NULL;
 314
 315 }
 316
 317 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 318 {
 319     if (app_pkey_methods == NULL) {
 320         app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 321         if (!app_pkey_methods)
 322             return 0;
 323     }
 324     if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
 325         return 0;
 326     sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 327     return 1;
 328 }
 329
 330 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 331 {
 332     if (ctx == NULL)
 333         return;
 334     if (ctx->pmeth && ctx->pmeth->cleanup)
 335         ctx->pmeth->cleanup(ctx);
 336     EVP_PKEY_free(ctx->pkey);
 337     EVP_PKEY_free(ctx->peerkey);
 338 #ifndef OPENSSL_NO_ENGINE
 339     if (ctx->engine)
 340         /*
 341          * The EVP_PKEY_CTX we used belongs to an ENGINE, release the
 342          * functional reference we held for this reason.
 343          */
 344         ENGINE_finish(ctx->engine);
 345 #endif
 346     OPENSSL_free(ctx);
 347 }
 348
 349 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 350                       int cmd, int p1, void *p2)
 351 {
 352     int ret;
 353     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
 354         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 355         return -2;
 356     }
 357     if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 358         return -1;
 359
 360     if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
 361         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 362         return -1;
 363     }
 364
 365     if ((optype != -1) && !(ctx->operation & optype)) {
 366         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 367         return -1;
 368     }
 369
 370     ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 371
 372     if (ret == -2)
 373         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 374
 375     return ret;
 376
 377 }
 378
 379 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 380                           const char *name, const char *value)
 381 {
 382     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
 383         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 384         return -2;
 385     }
 386     if (strcmp(name, "digest") == 0) {
 387         const EVP_MD *md;
 388         if (value == NULL || (md = EVP_get_digestbyname(value)) == NULL) {
 389             EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_INVALID_DIGEST);
 390             return 0;
 391         }
 392         return EVP_PKEY_CTX_set_signature_md(ctx, md);
 393     }
 394     return ctx->pmeth->ctrl_str(ctx, name, value);
 395 }
 396
 397 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 398 {
 399     return ctx->operation;
 400 }
 401
 402 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 403 {
 404     ctx->keygen_info = dat;
 405     ctx->keygen_info_count = datlen;
 406 }
 407
 408 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 409 {
 410     ctx->data = data;
 411 }
 412
 413 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
 414 {
 415     return ctx->data;
 416 }
 417
 418 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 419 {
 420     return ctx->pkey;
 421 }
 422
 423 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 424 {
 425     return ctx->peerkey;
 426 }
 427
 428 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 429 {
 430     ctx->app_data = data;
 431 }
 432
 433 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 434 {
 435     return ctx->app_data;
 436 }
 437
 438 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 439                             int (*init) (EVP_PKEY_CTX *ctx))
 440 {
 441     pmeth->init = init;
 442 }
 443
 444 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 445                             int (*copy) (EVP_PKEY_CTX *dst,
 446                                          EVP_PKEY_CTX *src))
 447 {
 448     pmeth->copy = copy;
 449 }
 450
 451 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 452                                void (*cleanup) (EVP_PKEY_CTX *ctx))
 453 {
 454     pmeth->cleanup = cleanup;
 455 }
 456
 457 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 458                                 int (*paramgen_init) (EVP_PKEY_CTX *ctx),
 459                                 int (*paramgen) (EVP_PKEY_CTX *ctx,
 460                                                  EVP_PKEY *pkey))
 461 {
 462     pmeth->paramgen_init = paramgen_init;
 463     pmeth->paramgen = paramgen;
 464 }
 465
 466 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 467                               int (*keygen_init) (EVP_PKEY_CTX *ctx),
 468                               int (*keygen) (EVP_PKEY_CTX *ctx,
 469                                              EVP_PKEY *pkey))
 470 {
 471     pmeth->keygen_init = keygen_init;
 472     pmeth->keygen = keygen;
 473 }
 474
 475 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 476                             int (*sign_init) (EVP_PKEY_CTX *ctx),
 477                             int (*sign) (EVP_PKEY_CTX *ctx,
 478                                          unsigned char *sig, size_t *siglen,
 479                                          const unsigned char *tbs,
 480                                          size_t tbslen))
 481 {
 482     pmeth->sign_init = sign_init;
 483     pmeth->sign = sign;
 484 }
 485
 486 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 487                               int (*verify_init) (EVP_PKEY_CTX *ctx),
 488                               int (*verify) (EVP_PKEY_CTX *ctx,
 489                                              const unsigned char *sig,
 490                                              size_t siglen,
 491                                              const unsigned char *tbs,
 492                                              size_t tbslen))
 493 {
 494     pmeth->verify_init = verify_init;
 495     pmeth->verify = verify;
 496 }
 497
 498 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 499                                       int (*verify_recover_init) (EVP_PKEY_CTX
 500                                                                   *ctx),
 501                                       int (*verify_recover) (EVP_PKEY_CTX
 502                                                              *ctx,
 503                                                              unsigned char
 504                                                              *sig,
 505                                                              size_t *siglen,
 506                                                              const unsigned
 507                                                              char *tbs,
 508                                                              size_t tbslen))
 509 {
 510     pmeth->verify_recover_init = verify_recover_init;
 511     pmeth->verify_recover = verify_recover;
 512 }
 513
 514 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 515                                int (*signctx_init) (EVP_PKEY_CTX *ctx,
 516                                                     EVP_MD_CTX *mctx),
 517                                int (*signctx) (EVP_PKEY_CTX *ctx,
 518                                                unsigned char *sig,
 519                                                size_t *siglen,
 520                                                EVP_MD_CTX *mctx))
 521 {
 522     pmeth->signctx_init = signctx_init;
 523     pmeth->signctx = signctx;
 524 }
 525
 526 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 527                                  int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
 528                                                         EVP_MD_CTX *mctx),
 529                                  int (*verifyctx) (EVP_PKEY_CTX *ctx,
 530                                                    const unsigned char *sig,
 531                                                    int siglen,
 532                                                    EVP_MD_CTX *mctx))
 533 {
 534     pmeth->verifyctx_init = verifyctx_init;
 535     pmeth->verifyctx = verifyctx;
 536 }
 537
 538 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 539                                int (*encrypt_init) (EVP_PKEY_CTX *ctx),
 540                                int (*encryptfn) (EVP_PKEY_CTX *ctx,
 541                                                  unsigned char *out,
 542                                                  size_t *outlen,
 543                                                  const unsigned char *in,
 544                                                  size_t inlen))
 545 {
 546     pmeth->encrypt_init = encrypt_init;
 547     pmeth->encrypt = encryptfn;
 548 }
 549
 550 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 551                                int (*decrypt_init) (EVP_PKEY_CTX *ctx),
 552                                int (*decrypt) (EVP_PKEY_CTX *ctx,
 553                                                unsigned char *out,
 554                                                size_t *outlen,
 555                                                const unsigned char *in,
 556                                                size_t inlen))
 557 {
 558     pmeth->decrypt_init = decrypt_init;
 559     pmeth->decrypt = decrypt;
 560 }
 561
 562 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 563                               int (*derive_init) (EVP_PKEY_CTX *ctx),
 564                               int (*derive) (EVP_PKEY_CTX *ctx,
 565                                              unsigned char *key,
 566                                              size_t *keylen))
 567 {
 568     pmeth->derive_init = derive_init;
 569     pmeth->derive = derive;
 570 }
 571
 572 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 573                             int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 574                                          void *p2),
 575                             int (*ctrl_str) (EVP_PKEY_CTX *ctx,
 576                                              const char *type,
 577                                              const char *value))
 578 {
 579     pmeth->ctrl = ctrl;
 580     pmeth->ctrl_str = ctrl_str;
 581 }