crypto/asymmetric_keys/pkcs7_parser.c

   1 /* PKCS#7 parser
   2  *
   3  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11
  12 #define pr_fmt(fmt) "PKCS7: "fmt
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/export.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/oid_registry.h>
  19 #include <crypto/public_key.h>
  20 #include "pkcs7_parser.h"
  21 #include "pkcs7.asn1.h"
  22
  23 MODULE_DESCRIPTION("PKCS#7 parser");
  24 MODULE_AUTHOR("Red Hat, Inc.");
  25 MODULE_LICENSE("GPL");
  26
  27 struct pkcs7_parse_context {
  28         struct pkcs7_message    *msg;           /* Message being constructed */
  29         struct pkcs7_signed_info *sinfo;        /* SignedInfo being constructed */
  30         struct pkcs7_signed_info **ppsinfo;
  31         struct x509_certificate *certs;         /* Certificate cache */
  32         struct x509_certificate **ppcerts;
  33         unsigned long   data;                   /* Start of data */
  34         enum OID        last_oid;               /* Last OID encountered */
  35         unsigned        x509_index;
  36         unsigned        sinfo_index;
  37         const void      *raw_serial;
  38         unsigned        raw_serial_size;
  39         unsigned        raw_issuer_size;
  40         const void      *raw_issuer;
  41         const void      *raw_skid;
  42         unsigned        raw_skid_size;
  43         bool            expect_skid;
  44 };
  45
  46 /*
  47  * Free a signed information block.
  48  */
  49 static void pkcs7_free_signed_info(struct pkcs7_signed_info *sinfo)
  50 {
  51         if (sinfo) {
  52                 public_key_signature_free(sinfo->sig);
  53                 kfree(sinfo);
  54         }
  55 }
  56
  57 /**
  58  * pkcs7_free_message - Free a PKCS#7 message
  59  * @pkcs7: The PKCS#7 message to free
  60  */
  61 void pkcs7_free_message(struct pkcs7_message *pkcs7)
  62 {
  63         struct x509_certificate *cert;
  64         struct pkcs7_signed_info *sinfo;
  65
  66         if (pkcs7) {
  67                 while (pkcs7->certs) {
  68                         cert = pkcs7->certs;
  69                         pkcs7->certs = cert->next;
  70                         x509_free_certificate(cert);
  71                 }
  72                 while (pkcs7->crl) {
  73                         cert = pkcs7->crl;
  74                         pkcs7->crl = cert->next;
  75                         x509_free_certificate(cert);
  76                 }
  77                 while (pkcs7->signed_infos) {
  78                         sinfo = pkcs7->signed_infos;
  79                         pkcs7->signed_infos = sinfo->next;
  80                         pkcs7_free_signed_info(sinfo);
  81                 }
  82                 kfree(pkcs7);
  83         }
  84 }
  85 EXPORT_SYMBOL_GPL(pkcs7_free_message);
  86
  87 /*
  88  * Check authenticatedAttributes are provided or not provided consistently.
  89  */
  90 static int pkcs7_check_authattrs(struct pkcs7_message *msg)
  91 {
  92         struct pkcs7_signed_info *sinfo;
  93         bool want = false;
  94
  95         sinfo = msg->signed_infos;
  96         if (!sinfo)
  97                 goto inconsistent;
  98
  99         if (sinfo->authattrs) {
 100                 want = true;
 101                 msg->have_authattrs = true;
 102         }
 103
 104         for (sinfo = sinfo->next; sinfo; sinfo = sinfo->next)
 105                 if (!!sinfo->authattrs != want)
 106                         goto inconsistent;
 107         return 0;
 108
 109 inconsistent:
 110         pr_warn("Inconsistently supplied authAttrs\n");
 111         return -EINVAL;
 112 }
 113
 114 /**
 115  * pkcs7_parse_message - Parse a PKCS#7 message
 116  * @data: The raw binary ASN.1 encoded message to be parsed
 117  * @datalen: The size of the encoded message
 118  */
 119 struct pkcs7_message *pkcs7_parse_message(const void *data, size_t datalen)
 120 {
 121         struct pkcs7_parse_context *ctx;
 122         struct pkcs7_message *msg = ERR_PTR(-ENOMEM);
 123         int ret;
 124
 125         ctx = kzalloc(sizeof(struct pkcs7_parse_context), GFP_KERNEL);
 126         if (!ctx)
 127                 goto out_no_ctx;
 128         ctx->msg = kzalloc(sizeof(struct pkcs7_message), GFP_KERNEL);
 129         if (!ctx->msg)
 130                 goto out_no_msg;
 131         ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
 132         if (!ctx->sinfo)
 133                 goto out_no_sinfo;
 134         ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature),
 135                                   GFP_KERNEL);
 136         if (!ctx->sinfo->sig)
 137                 goto out_no_sig;
 138
 139         ctx->data = (unsigned long)data;
 140         ctx->ppcerts = &ctx->certs;
 141         ctx->ppsinfo = &ctx->msg->signed_infos;
 142
 143         /* Attempt to decode the signature */
 144         ret = asn1_ber_decoder(&pkcs7_decoder, ctx, data, datalen);
 145         if (ret < 0) {
 146                 msg = ERR_PTR(ret);
 147                 goto out;
 148         }
 149
 150         ret = pkcs7_check_authattrs(ctx->msg);
 151         if (ret < 0) {
 152                 msg = ERR_PTR(ret);
 153                 goto out;
 154         }
 155
 156         msg = ctx->msg;
 157         ctx->msg = NULL;
 158
 159 out:
 160         while (ctx->certs) {
 161                 struct x509_certificate *cert = ctx->certs;
 162                 ctx->certs = cert->next;
 163                 x509_free_certificate(cert);
 164         }
 165 out_no_sig:
 166         pkcs7_free_signed_info(ctx->sinfo);
 167 out_no_sinfo:
 168         pkcs7_free_message(ctx->msg);
 169 out_no_msg:
 170         kfree(ctx);
 171 out_no_ctx:
 172         return msg;
 173 }
 174 EXPORT_SYMBOL_GPL(pkcs7_parse_message);
 175
 176 /**
 177  * pkcs7_get_content_data - Get access to the PKCS#7 content
 178  * @pkcs7: The preparsed PKCS#7 message to access
 179  * @_data: Place to return a pointer to the data
 180  * @_data_len: Place to return the data length
 181  * @_headerlen: Size of ASN.1 header not included in _data
 182  *
 183  * Get access to the data content of the PKCS#7 message.  The size of the
 184  * header of the ASN.1 object that contains it is also provided and can be used
 185  * to adjust *_data and *_data_len to get the entire object.
 186  *
 187  * Returns -ENODATA if the data object was missing from the message.
 188  */
 189 int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
 190                            const void **_data, size_t *_data_len,
 191                            size_t *_headerlen)
 192 {
 193         if (!pkcs7->data)
 194                 return -ENODATA;
 195
 196         *_data = pkcs7->data;
 197         *_data_len = pkcs7->data_len;
 198         if (_headerlen)
 199                 *_headerlen = pkcs7->data_hdrlen;
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(pkcs7_get_content_data);
 203
 204 /*
 205  * Note an OID when we find one for later processing when we know how
 206  * to interpret it.
 207  */
 208 int pkcs7_note_OID(void *context, size_t hdrlen,
 209                    unsigned char tag,
 210                    const void *value, size_t vlen)
 211 {
 212         struct pkcs7_parse_context *ctx = context;
 213
 214         ctx->last_oid = look_up_OID(value, vlen);
 215         if (ctx->last_oid == OID__NR) {
 216                 char buffer[50];
 217                 sprint_oid(value, vlen, buffer, sizeof(buffer));
 218                 printk("PKCS7: Unknown OID: [%lu] %s\n",
 219                        (unsigned long)value - ctx->data, buffer);
 220         }
 221         return 0;
 222 }
 223
 224 /*
 225  * Note the digest algorithm for the signature.
 226  */
 227 int pkcs7_sig_note_digest_algo(void *context, size_t hdrlen,
 228                                unsigned char tag,
 229                                const void *value, size_t vlen)
 230 {
 231         struct pkcs7_parse_context *ctx = context;
 232
 233         switch (ctx->last_oid) {
 234         case OID_md4:
 235                 ctx->sinfo->sig->hash_algo = "md4";
 236                 break;
 237         case OID_md5:
 238                 ctx->sinfo->sig->hash_algo = "md5";
 239                 break;
 240         case OID_sha1:
 241                 ctx->sinfo->sig->hash_algo = "sha1";
 242                 break;
 243         case OID_sha256:
 244                 ctx->sinfo->sig->hash_algo = "sha256";
 245                 break;
 246         case OID_sha384:
 247                 ctx->sinfo->sig->hash_algo = "sha384";
 248                 break;
 249         case OID_sha512:
 250                 ctx->sinfo->sig->hash_algo = "sha512";
 251                 break;
 252         case OID_sha224:
 253                 ctx->sinfo->sig->hash_algo = "sha224";
 254                 break;
 255         default:
 256                 printk("Unsupported digest algo: %u\n", ctx->last_oid);
 257                 return -ENOPKG;
 258         }
 259         return 0;
 260 }
 261
 262 /*
 263  * Note the public key algorithm for the signature.
 264  */
 265 int pkcs7_sig_note_pkey_algo(void *context, size_t hdrlen,
 266                              unsigned char tag,
 267                              const void *value, size_t vlen)
 268 {
 269         struct pkcs7_parse_context *ctx = context;
 270
 271         switch (ctx->last_oid) {
 272         case OID_rsaEncryption:
 273                 ctx->sinfo->sig->pkey_algo = "rsa";
 274                 ctx->sinfo->sig->encoding = "pkcs1";
 275                 break;
 276         default:
 277                 printk("Unsupported pkey algo: %u\n", ctx->last_oid);
 278                 return -ENOPKG;
 279         }
 280         return 0;
 281 }
 282
 283 /*
 284  * We only support signed data [RFC2315 sec 9].
 285  */
 286 int pkcs7_check_content_type(void *context, size_t hdrlen,
 287                              unsigned char tag,
 288                              const void *value, size_t vlen)
 289 {
 290         struct pkcs7_parse_context *ctx = context;
 291
 292         if (ctx->last_oid != OID_signed_data) {
 293                 pr_warn("Only support pkcs7_signedData type\n");
 294                 return -EINVAL;
 295         }
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * Note the SignedData version
 302  */
 303 int pkcs7_note_signeddata_version(void *context, size_t hdrlen,
 304                                   unsigned char tag,
 305                                   const void *value, size_t vlen)
 306 {
 307         struct pkcs7_parse_context *ctx = context;
 308         unsigned version;
 309
 310         if (vlen != 1)
 311                 goto unsupported;
 312
 313         ctx->msg->version = version = *(const u8 *)value;
 314         switch (version) {
 315         case 1:
 316                 /* PKCS#7 SignedData [RFC2315 sec 9.1]
 317                  * CMS ver 1 SignedData [RFC5652 sec 5.1]
 318                  */
 319                 break;
 320         case 3:
 321                 /* CMS ver 3 SignedData [RFC2315 sec 5.1] */
 322                 break;
 323         default:
 324                 goto unsupported;
 325         }
 326
 327         return 0;
 328
 329 unsupported:
 330         pr_warn("Unsupported SignedData version\n");
 331         return -EINVAL;
 332 }
 333
 334 /*
 335  * Note the SignerInfo version
 336  */
 337 int pkcs7_note_signerinfo_version(void *context, size_t hdrlen,
 338                                   unsigned char tag,
 339                                   const void *value, size_t vlen)
 340 {
 341         struct pkcs7_parse_context *ctx = context;
 342         unsigned version;
 343
 344         if (vlen != 1)
 345                 goto unsupported;
 346
 347         version = *(const u8 *)value;
 348         switch (version) {
 349         case 1:
 350                 /* PKCS#7 SignerInfo [RFC2315 sec 9.2]
 351                  * CMS ver 1 SignerInfo [RFC5652 sec 5.3]
 352                  */
 353                 if (ctx->msg->version != 1)
 354                         goto version_mismatch;
 355                 ctx->expect_skid = false;
 356                 break;
 357         case 3:
 358                 /* CMS ver 3 SignerInfo [RFC2315 sec 5.3] */
 359                 if (ctx->msg->version == 1)
 360                         goto version_mismatch;
 361                 ctx->expect_skid = true;
 362                 break;
 363         default:
 364                 goto unsupported;
 365         }
 366
 367         return 0;
 368
 369 unsupported:
 370         pr_warn("Unsupported SignerInfo version\n");
 371         return -EINVAL;
 372 version_mismatch:
 373         pr_warn("SignedData-SignerInfo version mismatch\n");
 374         return -EBADMSG;
 375 }
 376
 377 /*
 378  * Extract a certificate and store it in the context.
 379  */
 380 int pkcs7_extract_cert(void *context, size_t hdrlen,
 381                        unsigned char tag,
 382                        const void *value, size_t vlen)
 383 {
 384         struct pkcs7_parse_context *ctx = context;
 385         struct x509_certificate *x509;
 386
 387         if (tag != ((ASN1_UNIV << 6) | ASN1_CONS_BIT | ASN1_SEQ)) {
 388                 pr_debug("Cert began with tag %02x at %lu\n",
 389                          tag, (unsigned long)ctx - ctx->data);
 390                 return -EBADMSG;
 391         }
 392
 393         /* We have to correct for the header so that the X.509 parser can start
 394          * from the beginning.  Note that since X.509 stipulates DER, there
 395          * probably shouldn't be an EOC trailer - but it is in PKCS#7 (which
 396          * stipulates BER).
 397          */
 398         value -= hdrlen;
 399         vlen += hdrlen;
 400
 401         if (((u8*)value)[1] == 0x80)
 402                 vlen += 2; /* Indefinite length - there should be an EOC */
 403
 404         x509 = x509_cert_parse(value, vlen);
 405         if (IS_ERR(x509))
 406                 return PTR_ERR(x509);
 407
 408         x509->index = ++ctx->x509_index;
 409         pr_debug("Got cert %u for %s\n", x509->index, x509->subject);
 410         pr_debug("- fingerprint %*phN\n", x509->id->len, x509->id->data);
 411
 412         *ctx->ppcerts = x509;
 413         ctx->ppcerts = &x509->next;
 414         return 0;
 415 }
 416
 417 /*
 418  * Save the certificate list
 419  */
 420 int pkcs7_note_certificate_list(void *context, size_t hdrlen,
 421                                 unsigned char tag,
 422                                 const void *value, size_t vlen)
 423 {
 424         struct pkcs7_parse_context *ctx = context;
 425
 426         pr_devel("Got cert list (%02x)\n", tag);
 427
 428         *ctx->ppcerts = ctx->msg->certs;
 429         ctx->msg->certs = ctx->certs;
 430         ctx->certs = NULL;
 431         ctx->ppcerts = &ctx->certs;
 432         return 0;
 433 }
 434
 435 /*
 436  * Note the content type.
 437  */
 438 int pkcs7_note_content(void *context, size_t hdrlen,
 439                        unsigned char tag,
 440                        const void *value, size_t vlen)
 441 {
 442         struct pkcs7_parse_context *ctx = context;
 443
 444         if (ctx->last_oid != OID_data &&
 445             ctx->last_oid != OID_msIndirectData) {
 446                 pr_warn("Unsupported data type %d\n", ctx->last_oid);
 447                 return -EINVAL;
 448         }
 449
 450         ctx->msg->data_type = ctx->last_oid;
 451         return 0;
 452 }
 453
 454 /*
 455  * Extract the data from the message and store that and its content type OID in
 456  * the context.
 457  */
 458 int pkcs7_note_data(void *context, size_t hdrlen,
 459                     unsigned char tag,
 460                     const void *value, size_t vlen)
 461 {
 462         struct pkcs7_parse_context *ctx = context;
 463
 464         pr_debug("Got data\n");
 465
 466         ctx->msg->data = value;
 467         ctx->msg->data_len = vlen;
 468         ctx->msg->data_hdrlen = hdrlen;
 469         return 0;
 470 }
 471
 472 /*
 473  * Parse authenticated attributes.
 474  */
 475 int pkcs7_sig_note_authenticated_attr(void *context, size_t hdrlen,
 476                                       unsigned char tag,
 477                                       const void *value, size_t vlen)
 478 {
 479         struct pkcs7_parse_context *ctx = context;
 480         struct pkcs7_signed_info *sinfo = ctx->sinfo;
 481         enum OID content_type;
 482
 483         pr_devel("AuthAttr: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value);
 484
 485         switch (ctx->last_oid) {
 486         case OID_contentType:
 487                 if (__test_and_set_bit(sinfo_has_content_type, &sinfo->aa_set))
 488                         goto repeated;
 489                 content_type = look_up_OID(value, vlen);
 490                 if (content_type != ctx->msg->data_type) {
 491                         pr_warn("Mismatch between global data type (%d) and sinfo %u (%d)\n",
 492                                 ctx->msg->data_type, sinfo->index,
 493                                 content_type);
 494                         return -EBADMSG;
 495                 }
 496                 return 0;
 497
 498         case OID_signingTime:
 499                 if (__test_and_set_bit(sinfo_has_signing_time, &sinfo->aa_set))
 500                         goto repeated;
 501                 /* Should we check that the signing time is consistent
 502                  * with the signer's X.509 cert?
 503                  */
 504                 return x509_decode_time(&sinfo->signing_time,
 505                                         hdrlen, tag, value, vlen);
 506
 507         case OID_messageDigest:
 508                 if (__test_and_set_bit(sinfo_has_message_digest, &sinfo->aa_set))
 509                         goto repeated;
 510                 if (tag != ASN1_OTS)
 511                         return -EBADMSG;
 512                 sinfo->msgdigest = value;
 513                 sinfo->msgdigest_len = vlen;
 514                 return 0;
 515
 516         case OID_smimeCapabilites:
 517                 if (__test_and_set_bit(sinfo_has_smime_caps, &sinfo->aa_set))
 518                         goto repeated;
 519                 if (ctx->msg->data_type != OID_msIndirectData) {
 520                         pr_warn("S/MIME Caps only allowed with Authenticode\n");
 521                         return -EKEYREJECTED;
 522                 }
 523                 return 0;
 524
 525                 /* Microsoft SpOpusInfo seems to be contain cont[0] 16-bit BE
 526                  * char URLs and cont[1] 8-bit char URLs.
 527                  *
 528                  * Microsoft StatementType seems to contain a list of OIDs that
 529                  * are also used as extendedKeyUsage types in X.509 certs.
 530                  */
 531         case OID_msSpOpusInfo:
 532                 if (__test_and_set_bit(sinfo_has_ms_opus_info, &sinfo->aa_set))
 533                         goto repeated;
 534                 goto authenticode_check;
 535         case OID_msStatementType:
 536                 if (__test_and_set_bit(sinfo_has_ms_statement_type, &sinfo->aa_set))
 537                         goto repeated;
 538         authenticode_check:
 539                 if (ctx->msg->data_type != OID_msIndirectData) {
 540                         pr_warn("Authenticode AuthAttrs only allowed with Authenticode\n");
 541                         return -EKEYREJECTED;
 542                 }
 543                 /* I'm not sure how to validate these */
 544                 return 0;
 545         default:
 546                 return 0;
 547         }
 548
 549 repeated:
 550         /* We permit max one item per AuthenticatedAttribute and no repeats */
 551         pr_warn("Repeated/multivalue AuthAttrs not permitted\n");
 552         return -EKEYREJECTED;
 553 }
 554
 555 /*
 556  * Note the set of auth attributes for digestion purposes [RFC2315 sec 9.3]
 557  */
 558 int pkcs7_sig_note_set_of_authattrs(void *context, size_t hdrlen,
 559                                     unsigned char tag,
 560                                     const void *value, size_t vlen)
 561 {
 562         struct pkcs7_parse_context *ctx = context;
 563         struct pkcs7_signed_info *sinfo = ctx->sinfo;
 564
 565         if (!test_bit(sinfo_has_content_type, &sinfo->aa_set) ||
 566             !test_bit(sinfo_has_message_digest, &sinfo->aa_set)) {
 567                 pr_warn("Missing required AuthAttr\n");
 568                 return -EBADMSG;
 569         }
 570
 571         if (ctx->msg->data_type != OID_msIndirectData &&
 572             test_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) {
 573                 pr_warn("Unexpected Authenticode AuthAttr\n");
 574                 return -EBADMSG;
 575         }
 576
 577         /* We need to switch the 'CONT 0' to a 'SET OF' when we digest */
 578         sinfo->authattrs = value - (hdrlen - 1);
 579         sinfo->authattrs_len = vlen + (hdrlen - 1);
 580         return 0;
 581 }
 582
 583 /*
 584  * Note the issuing certificate serial number
 585  */
 586 int pkcs7_sig_note_serial(void *context, size_t hdrlen,
 587                           unsigned char tag,
 588                           const void *value, size_t vlen)
 589 {
 590         struct pkcs7_parse_context *ctx = context;
 591         ctx->raw_serial = value;
 592         ctx->raw_serial_size = vlen;
 593         return 0;
 594 }
 595
 596 /*
 597  * Note the issuer's name
 598  */
 599 int pkcs7_sig_note_issuer(void *context, size_t hdrlen,
 600                           unsigned char tag,
 601                           const void *value, size_t vlen)
 602 {
 603         struct pkcs7_parse_context *ctx = context;
 604         ctx->raw_issuer = value;
 605         ctx->raw_issuer_size = vlen;
 606         return 0;
 607 }
 608
 609 /*
 610  * Note the issuing cert's subjectKeyIdentifier
 611  */
 612 int pkcs7_sig_note_skid(void *context, size_t hdrlen,
 613                         unsigned char tag,
 614                         const void *value, size_t vlen)
 615 {
 616         struct pkcs7_parse_context *ctx = context;
 617
 618         pr_devel("SKID: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value);
 619
 620         ctx->raw_skid = value;
 621         ctx->raw_skid_size = vlen;
 622         return 0;
 623 }
 624
 625 /*
 626  * Note the signature data
 627  */
 628 int pkcs7_sig_note_signature(void *context, size_t hdrlen,
 629                              unsigned char tag,
 630                              const void *value, size_t vlen)
 631 {
 632         struct pkcs7_parse_context *ctx = context;
 633
 634         ctx->sinfo->sig->s = kmemdup(value, vlen, GFP_KERNEL);
 635         if (!ctx->sinfo->sig->s)
 636                 return -ENOMEM;
 637
 638         ctx->sinfo->sig->s_size = vlen;
 639         return 0;
 640 }
 641
 642 /*
 643  * Note a signature information block
 644  */
 645 int pkcs7_note_signed_info(void *context, size_t hdrlen,
 646                            unsigned char tag,
 647                            const void *value, size_t vlen)
 648 {
 649         struct pkcs7_parse_context *ctx = context;
 650         struct pkcs7_signed_info *sinfo = ctx->sinfo;
 651         struct asymmetric_key_id *kid;
 652
 653         if (ctx->msg->data_type == OID_msIndirectData && !sinfo->authattrs) {
 654                 pr_warn("Authenticode requires AuthAttrs\n");
 655                 return -EBADMSG;
 656         }
 657
 658         /* Generate cert issuer + serial number key ID */
 659         if (!ctx->expect_skid) {
 660                 kid = asymmetric_key_generate_id(ctx->raw_serial,
 661                                                  ctx->raw_serial_size,
 662                                                  ctx->raw_issuer,
 663                                                  ctx->raw_issuer_size);
 664         } else {
 665                 kid = asymmetric_key_generate_id(ctx->raw_skid,
 666                                                  ctx->raw_skid_size,
 667                                                  "", 0);
 668         }
 669         if (IS_ERR(kid))
 670                 return PTR_ERR(kid);
 671
 672         pr_devel("SINFO KID: %u [%*phN]\n", kid->len, kid->len, kid->data);
 673
 674         sinfo->sig->auth_ids[0] = kid;
 675         sinfo->index = ++ctx->sinfo_index;
 676         *ctx->ppsinfo = sinfo;
 677         ctx->ppsinfo = &sinfo->next;
 678         ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
 679         if (!ctx->sinfo)
 680                 return -ENOMEM;
 681         ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature),
 682                                   GFP_KERNEL);
 683         if (!ctx->sinfo->sig)
 684                 return -ENOMEM;
 685         return 0;
 686 }