git.oblomov.eu Git - wine/blob - dlls/crypt32/message.c

   1 /*
   2  * Copyright 2007 Juan Lang
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <stdarg.h>
  20 #include "windef.h"
  21 #include "winbase.h"
  22 #include "wincrypt.h"
  23
  24 #include "wine/debug.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
  27
  28 HCERTSTORE WINAPI CryptGetMessageCertificates(DWORD dwMsgAndCertEncodingType,
  29  HCRYPTPROV_LEGACY hCryptProv, DWORD dwFlags, const BYTE* pbSignedBlob,
  30  DWORD cbSignedBlob)
  31 {
  32     CRYPT_DATA_BLOB blob = { cbSignedBlob, (LPBYTE)pbSignedBlob };
  33
  34     TRACE("(%08x, %ld, %d08x %p, %d)\n", dwMsgAndCertEncodingType, hCryptProv,
  35      dwFlags, pbSignedBlob, cbSignedBlob);
  36
  37     return CertOpenStore(CERT_STORE_PROV_PKCS7, dwMsgAndCertEncodingType,
  38      hCryptProv, dwFlags, &blob);
  39 }
  40
  41 LONG WINAPI CryptGetMessageSignerCount(DWORD dwMsgEncodingType,
  42  const BYTE *pbSignedBlob, DWORD cbSignedBlob)
  43 {
  44     HCRYPTMSG msg;
  45     LONG count = -1;
  46
  47     TRACE("(%08x, %p, %d)\n", dwMsgEncodingType, pbSignedBlob, cbSignedBlob);
  48
  49     msg = CryptMsgOpenToDecode(dwMsgEncodingType, 0, 0, 0, NULL, NULL);
  50     if (msg)
  51     {
  52         if (CryptMsgUpdate(msg, pbSignedBlob, cbSignedBlob, TRUE))
  53         {
  54             DWORD size = sizeof(count);
  55
  56             CryptMsgGetParam(msg, CMSG_SIGNER_COUNT_PARAM, 0, &count, &size);
  57         }
  58         CryptMsgClose(msg);
  59     }
  60     return count;
  61 }
  62
  63 static CERT_INFO *CRYPT_GetSignerCertInfoFromMsg(HCRYPTMSG msg,
  64  DWORD dwSignerIndex)
  65 {
  66     CERT_INFO *certInfo = NULL;
  67     DWORD size;
  68
  69     if (CryptMsgGetParam(msg, CMSG_SIGNER_CERT_INFO_PARAM, dwSignerIndex, NULL,
  70      &size))
  71     {
  72         certInfo = CryptMemAlloc(size);
  73         if (certInfo)
  74         {
  75             if (!CryptMsgGetParam(msg, CMSG_SIGNER_CERT_INFO_PARAM,
  76              dwSignerIndex, certInfo, &size))
  77             {
  78                 CryptMemFree(certInfo);
  79                 certInfo = NULL;
  80             }
  81         }
  82     }
  83     else
  84         SetLastError(CRYPT_E_UNEXPECTED_MSG_TYPE);
  85     return certInfo;
  86 }
  87
  88 static PCCERT_CONTEXT WINAPI CRYPT_DefaultGetSignerCertificate(void *pvGetArg,
  89  DWORD dwCertEncodingType, PCERT_INFO pSignerId, HCERTSTORE hMsgCertStore)
  90 {
  91     return CertFindCertificateInStore(hMsgCertStore, dwCertEncodingType, 0,
  92      CERT_FIND_SUBJECT_CERT, pSignerId, NULL);
  93 }
  94
  95 static inline PCCERT_CONTEXT CRYPT_GetSignerCertificate(HCRYPTMSG msg,
  96  PCRYPT_VERIFY_MESSAGE_PARA pVerifyPara, PCERT_INFO certInfo, HCERTSTORE store)
  97 {
  98     PFN_CRYPT_GET_SIGNER_CERTIFICATE getCert;
  99
 100     if (pVerifyPara->pfnGetSignerCertificate)
 101         getCert = pVerifyPara->pfnGetSignerCertificate;
 102     else
 103         getCert = CRYPT_DefaultGetSignerCertificate;
 104     return getCert(pVerifyPara->pvGetArg,
 105      pVerifyPara->dwMsgAndCertEncodingType, certInfo, store);
 106 }
 107
 108 BOOL WINAPI CryptVerifyDetachedMessageSignature(
 109  PCRYPT_VERIFY_MESSAGE_PARA pVerifyPara, DWORD dwSignerIndex,
 110  const BYTE *pbDetachedSignBlob, DWORD cbDetachedSignBlob, DWORD cToBeSigned,
 111  const BYTE *rgpbToBeSigned[], DWORD rgcbToBeSigned[],
 112  PCCERT_CONTEXT *ppSignerCert)
 113 {
 114     BOOL ret = FALSE;
 115     HCRYPTMSG msg;
 116
 117     TRACE("(%p, %d, %p, %d, %d, %p, %p, %p)\n", pVerifyPara, dwSignerIndex,
 118      pbDetachedSignBlob, cbDetachedSignBlob, cToBeSigned, rgpbToBeSigned,
 119      rgcbToBeSigned, ppSignerCert);
 120
 121     if (ppSignerCert)
 122         *ppSignerCert = NULL;
 123     if (!pVerifyPara ||
 124      pVerifyPara->cbSize != sizeof(CRYPT_VERIFY_MESSAGE_PARA) ||
 125      GET_CMSG_ENCODING_TYPE(pVerifyPara->dwMsgAndCertEncodingType) !=
 126      PKCS_7_ASN_ENCODING)
 127     {
 128         SetLastError(E_INVALIDARG);
 129         return FALSE;
 130     }
 131
 132     msg = CryptMsgOpenToDecode(pVerifyPara->dwMsgAndCertEncodingType,
 133      CMSG_DETACHED_FLAG, 0, pVerifyPara->hCryptProv, NULL, NULL);
 134     if (msg)
 135     {
 136         ret = CryptMsgUpdate(msg, pbDetachedSignBlob, cbDetachedSignBlob, TRUE);
 137         if (ret)
 138         {
 139             DWORD i;
 140
 141             for (i = 0; ret && i < cToBeSigned; i++)
 142                 ret = CryptMsgUpdate(msg, rgpbToBeSigned[i], rgcbToBeSigned[i],
 143                  i == cToBeSigned - 1);
 144         }
 145         if (ret)
 146         {
 147             CERT_INFO *certInfo = CRYPT_GetSignerCertInfoFromMsg(msg,
 148              dwSignerIndex);
 149
 150             ret = FALSE;
 151             if (certInfo)
 152             {
 153                 HCERTSTORE store = CertOpenStore(CERT_STORE_PROV_MSG,
 154                  pVerifyPara->dwMsgAndCertEncodingType,
 155                  pVerifyPara->hCryptProv, 0, msg);
 156
 157                 if (store)
 158                 {
 159                     PCCERT_CONTEXT cert = CRYPT_GetSignerCertificate(
 160                      msg, pVerifyPara, certInfo, store);
 161
 162                     if (cert)
 163                     {
 164                         ret = CryptMsgControl(msg, 0,
 165                          CMSG_CTRL_VERIFY_SIGNATURE, cert->pCertInfo);
 166                         if (ret && ppSignerCert)
 167                             *ppSignerCert = cert;
 168                         else
 169                             CertFreeCertificateContext(cert);
 170                     }
 171                     else
 172                         SetLastError(CRYPT_E_NOT_FOUND);
 173                     CertCloseStore(store, 0);
 174                 }
 175                 CryptMemFree(certInfo);
 176             }
 177         }
 178         CryptMsgClose(msg);
 179     }
 180     TRACE("returning %d\n", ret);
 181     return ret;
 182 }
 183
 184 BOOL WINAPI CryptVerifyMessageSignature(PCRYPT_VERIFY_MESSAGE_PARA pVerifyPara,
 185  DWORD dwSignerIndex, const BYTE* pbSignedBlob, DWORD cbSignedBlob,
 186  BYTE* pbDecoded, DWORD* pcbDecoded, PCCERT_CONTEXT* ppSignerCert)
 187 {
 188     BOOL ret = FALSE;
 189     HCRYPTMSG msg;
 190
 191     TRACE("(%p, %d, %p, %d, %p, %p, %p)\n",
 192      pVerifyPara, dwSignerIndex, pbSignedBlob, cbSignedBlob,
 193      pbDecoded, pcbDecoded, ppSignerCert);
 194
 195     if (ppSignerCert)
 196         *ppSignerCert = NULL;
 197     if (!pVerifyPara ||
 198      pVerifyPara->cbSize != sizeof(CRYPT_VERIFY_MESSAGE_PARA) ||
 199      GET_CMSG_ENCODING_TYPE(pVerifyPara->dwMsgAndCertEncodingType) !=
 200      PKCS_7_ASN_ENCODING)
 201     {
 202         if(pcbDecoded)
 203             *pcbDecoded = 0;
 204         SetLastError(E_INVALIDARG);
 205         return FALSE;
 206     }
 207
 208     msg = CryptMsgOpenToDecode(pVerifyPara->dwMsgAndCertEncodingType, 0, 0,
 209      pVerifyPara->hCryptProv, NULL, NULL);
 210     if (msg)
 211     {
 212         ret = CryptMsgUpdate(msg, pbSignedBlob, cbSignedBlob, TRUE);
 213         if (ret && pcbDecoded)
 214             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbDecoded,
 215              pcbDecoded);
 216         if (ret)
 217         {
 218             CERT_INFO *certInfo = CRYPT_GetSignerCertInfoFromMsg(msg,
 219              dwSignerIndex);
 220
 221             ret = FALSE;
 222             if (certInfo)
 223             {
 224                 HCERTSTORE store = CertOpenStore(CERT_STORE_PROV_MSG,
 225                  pVerifyPara->dwMsgAndCertEncodingType,
 226                  pVerifyPara->hCryptProv, 0, msg);
 227
 228                 if (store)
 229                 {
 230                     PCCERT_CONTEXT cert = CRYPT_GetSignerCertificate(
 231                      msg, pVerifyPara, certInfo, store);
 232
 233                     if (cert)
 234                     {
 235                         ret = CryptMsgControl(msg, 0,
 236                          CMSG_CTRL_VERIFY_SIGNATURE, cert->pCertInfo);
 237                         if (ret && ppSignerCert)
 238                             *ppSignerCert = cert;
 239                         else
 240                             CertFreeCertificateContext(cert);
 241                     }
 242                     CertCloseStore(store, 0);
 243                 }
 244             }
 245             CryptMemFree(certInfo);
 246         }
 247         CryptMsgClose(msg);
 248     }
 249     if(!ret && pcbDecoded)
 250         *pcbDecoded = 0;
 251     TRACE("returning %d\n", ret);
 252     return ret;
 253 }
 254
 255 BOOL WINAPI CryptHashMessage(PCRYPT_HASH_MESSAGE_PARA pHashPara,
 256  BOOL fDetachedHash, DWORD cToBeHashed, const BYTE *rgpbToBeHashed[],
 257  DWORD rgcbToBeHashed[], BYTE *pbHashedBlob, DWORD *pcbHashedBlob,
 258  BYTE *pbComputedHash, DWORD *pcbComputedHash)
 259 {
 260     DWORD i, flags;
 261     BOOL ret = FALSE;
 262     HCRYPTMSG msg;
 263     CMSG_HASHED_ENCODE_INFO info;
 264
 265     TRACE("(%p, %d, %d, %p, %p, %p, %p, %p, %p)\n", pHashPara, fDetachedHash,
 266      cToBeHashed, rgpbToBeHashed, rgcbToBeHashed, pbHashedBlob, pcbHashedBlob,
 267      pbComputedHash, pcbComputedHash);
 268
 269     if (pHashPara->cbSize != sizeof(CRYPT_HASH_MESSAGE_PARA))
 270     {
 271         SetLastError(E_INVALIDARG);
 272         return FALSE;
 273     }
 274     /* Native seems to ignore any encoding type other than the expected
 275      * PKCS_7_ASN_ENCODING
 276      */
 277     if (GET_CMSG_ENCODING_TYPE(pHashPara->dwMsgEncodingType) !=
 278      PKCS_7_ASN_ENCODING)
 279         return TRUE;
 280     /* Native also seems to do nothing if the output parameter isn't given */
 281     if (!pcbHashedBlob)
 282         return TRUE;
 283
 284     flags = fDetachedHash ? CMSG_DETACHED_FLAG : 0;
 285     memset(&info, 0, sizeof(info));
 286     info.cbSize = sizeof(info);
 287     info.hCryptProv = pHashPara->hCryptProv;
 288     info.HashAlgorithm = pHashPara->HashAlgorithm;
 289     info.pvHashAuxInfo = pHashPara->pvHashAuxInfo;
 290     msg = CryptMsgOpenToEncode(pHashPara->dwMsgEncodingType, flags, CMSG_HASHED,
 291      &info, NULL, NULL);
 292     if (msg)
 293     {
 294         for (i = 0, ret = TRUE; ret && i < cToBeHashed; i++)
 295             ret = CryptMsgUpdate(msg, rgpbToBeHashed[i], rgcbToBeHashed[i], i == cToBeHashed - 1);
 296         if (ret)
 297         {
 298             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbHashedBlob,
 299              pcbHashedBlob);
 300             if (ret && pcbComputedHash)
 301                 ret = CryptMsgGetParam(msg, CMSG_COMPUTED_HASH_PARAM, 0,
 302                  pbComputedHash, pcbComputedHash);
 303         }
 304         CryptMsgClose(msg);
 305     }
 306     return ret;
 307 }
 308
 309 BOOL WINAPI CryptVerifyDetachedMessageHash(PCRYPT_HASH_MESSAGE_PARA pHashPara,
 310  BYTE *pbDetachedHashBlob, DWORD cbDetachedHashBlob, DWORD cToBeHashed,
 311  const BYTE *rgpbToBeHashed[], DWORD rgcbToBeHashed[], BYTE *pbComputedHash,
 312  DWORD *pcbComputedHash)
 313 {
 314     HCRYPTMSG msg;
 315     BOOL ret = FALSE;
 316
 317     TRACE("(%p, %p, %d, %d, %p, %p, %p, %p)\n", pHashPara, pbDetachedHashBlob,
 318      cbDetachedHashBlob, cToBeHashed, rgpbToBeHashed, rgcbToBeHashed,
 319      pbComputedHash, pcbComputedHash);
 320
 321     if (pHashPara->cbSize != sizeof(CRYPT_HASH_MESSAGE_PARA))
 322     {
 323         SetLastError(E_INVALIDARG);
 324         return FALSE;
 325     }
 326     if (GET_CMSG_ENCODING_TYPE(pHashPara->dwMsgEncodingType) !=
 327      PKCS_7_ASN_ENCODING)
 328     {
 329         SetLastError(E_INVALIDARG);
 330         return FALSE;
 331     }
 332     msg = CryptMsgOpenToDecode(pHashPara->dwMsgEncodingType, CMSG_DETACHED_FLAG,
 333      0, pHashPara->hCryptProv, NULL, NULL);
 334     if (msg)
 335     {
 336         DWORD i;
 337
 338         ret = CryptMsgUpdate(msg, pbDetachedHashBlob, cbDetachedHashBlob, TRUE);
 339         if (ret)
 340         {
 341             if (cToBeHashed)
 342             {
 343                 for (i = 0; ret && i < cToBeHashed; i++)
 344                 {
 345                     ret = CryptMsgUpdate(msg, rgpbToBeHashed[i],
 346                      rgcbToBeHashed[i], i == cToBeHashed - 1);
 347                 }
 348             }
 349             else
 350                 ret = CryptMsgUpdate(msg, NULL, 0, TRUE);
 351         }
 352         if (ret)
 353         {
 354             ret = CryptMsgControl(msg, 0, CMSG_CTRL_VERIFY_HASH, NULL);
 355             if (ret && pcbComputedHash)
 356                 ret = CryptMsgGetParam(msg, CMSG_COMPUTED_HASH_PARAM, 0,
 357                  pbComputedHash, pcbComputedHash);
 358         }
 359         CryptMsgClose(msg);
 360     }
 361     return ret;
 362 }
 363
 364 BOOL WINAPI CryptVerifyMessageHash(PCRYPT_HASH_MESSAGE_PARA pHashPara,
 365  BYTE *pbHashedBlob, DWORD cbHashedBlob, BYTE *pbToBeHashed,
 366  DWORD *pcbToBeHashed, BYTE *pbComputedHash, DWORD *pcbComputedHash)
 367 {
 368     HCRYPTMSG msg;
 369     BOOL ret = FALSE;
 370
 371     TRACE("(%p, %p, %d, %p, %p, %p, %p)\n", pHashPara, pbHashedBlob,
 372      cbHashedBlob, pbToBeHashed, pcbToBeHashed, pbComputedHash,
 373      pcbComputedHash);
 374
 375     if (pHashPara->cbSize != sizeof(CRYPT_HASH_MESSAGE_PARA))
 376     {
 377         SetLastError(E_INVALIDARG);
 378         return FALSE;
 379     }
 380     if (GET_CMSG_ENCODING_TYPE(pHashPara->dwMsgEncodingType) !=
 381      PKCS_7_ASN_ENCODING)
 382     {
 383         SetLastError(E_INVALIDARG);
 384         return FALSE;
 385     }
 386     msg = CryptMsgOpenToDecode(pHashPara->dwMsgEncodingType, 0, 0,
 387      pHashPara->hCryptProv, NULL, NULL);
 388     if (msg)
 389     {
 390         ret = CryptMsgUpdate(msg, pbHashedBlob, cbHashedBlob, TRUE);
 391         if (ret)
 392         {
 393             ret = CryptMsgControl(msg, 0, CMSG_CTRL_VERIFY_HASH, NULL);
 394             if (ret && pcbToBeHashed)
 395                 ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0,
 396                  pbToBeHashed, pcbToBeHashed);
 397             if (ret && pcbComputedHash)
 398                 ret = CryptMsgGetParam(msg, CMSG_COMPUTED_HASH_PARAM, 0,
 399                  pbComputedHash, pcbComputedHash);
 400         }
 401         CryptMsgClose(msg);
 402     }
 403     return ret;
 404 }
 405
 406 BOOL WINAPI CryptSignMessage(PCRYPT_SIGN_MESSAGE_PARA pSignPara,
 407  BOOL fDetachedSignature, DWORD cToBeSigned, const BYTE *rgpbToBeSigned[],
 408  DWORD rgcbToBeSigned[], BYTE *pbSignedBlob, DWORD *pcbSignedBlob)
 409 {
 410     HCRYPTPROV hCryptProv;
 411     BOOL ret, freeProv = FALSE;
 412     DWORD i, keySpec;
 413     PCERT_BLOB certBlob = NULL;
 414     PCRL_BLOB crlBlob = NULL;
 415     CMSG_SIGNED_ENCODE_INFO signInfo;
 416     CMSG_SIGNER_ENCODE_INFO signer;
 417     HCRYPTMSG msg = 0;
 418
 419     TRACE("(%p, %d, %d, %p, %p, %p, %p)\n", pSignPara, fDetachedSignature,
 420      cToBeSigned, rgpbToBeSigned, rgcbToBeSigned, pbSignedBlob, pcbSignedBlob);
 421
 422     if (pSignPara->cbSize != sizeof(CRYPT_SIGN_MESSAGE_PARA) ||
 423      GET_CMSG_ENCODING_TYPE(pSignPara->dwMsgEncodingType) !=
 424      PKCS_7_ASN_ENCODING)
 425     {
 426         *pcbSignedBlob = 0;
 427         SetLastError(E_INVALIDARG);
 428         return FALSE;
 429     }
 430     if (!pSignPara->pSigningCert)
 431         return TRUE;
 432
 433     ret = CryptAcquireCertificatePrivateKey(pSignPara->pSigningCert,
 434      CRYPT_ACQUIRE_CACHE_FLAG, NULL, &hCryptProv, &keySpec, &freeProv);
 435     if (!ret)
 436         return FALSE;
 437
 438     memset(&signer, 0, sizeof(signer));
 439     signer.cbSize = sizeof(signer);
 440     signer.pCertInfo = pSignPara->pSigningCert->pCertInfo;
 441     signer.hCryptProv = hCryptProv;
 442     signer.dwKeySpec = keySpec;
 443     signer.HashAlgorithm = pSignPara->HashAlgorithm;
 444     signer.pvHashAuxInfo = pSignPara->pvHashAuxInfo;
 445     signer.cAuthAttr = pSignPara->cAuthAttr;
 446     signer.rgAuthAttr = pSignPara->rgAuthAttr;
 447     signer.cUnauthAttr = pSignPara->cUnauthAttr;
 448     signer.rgUnauthAttr = pSignPara->rgUnauthAttr;
 449
 450     memset(&signInfo, 0, sizeof(signInfo));
 451     signInfo.cbSize = sizeof(signInfo);
 452     signInfo.cSigners = 1;
 453     signInfo.rgSigners = &signer;
 454
 455     if (pSignPara->cMsgCert)
 456     {
 457         certBlob = CryptMemAlloc(sizeof(CERT_BLOB) * pSignPara->cMsgCert);
 458         if (certBlob)
 459         {
 460             for (i = 0; i < pSignPara->cMsgCert; ++i)
 461             {
 462                 certBlob[i].cbData = pSignPara->rgpMsgCert[i]->cbCertEncoded;
 463                 certBlob[i].pbData = pSignPara->rgpMsgCert[i]->pbCertEncoded;
 464             }
 465             signInfo.cCertEncoded = pSignPara->cMsgCert;
 466             signInfo.rgCertEncoded = certBlob;
 467         }
 468         else
 469             ret = FALSE;
 470     }
 471     if (pSignPara->cMsgCrl)
 472     {
 473         crlBlob = CryptMemAlloc(sizeof(CRL_BLOB) * pSignPara->cMsgCrl);
 474         if (crlBlob)
 475         {
 476             for (i = 0; i < pSignPara->cMsgCrl; ++i)
 477             {
 478                 crlBlob[i].cbData = pSignPara->rgpMsgCrl[i]->cbCrlEncoded;
 479                 crlBlob[i].pbData = pSignPara->rgpMsgCrl[i]->pbCrlEncoded;
 480             }
 481             signInfo.cCrlEncoded = pSignPara->cMsgCrl;
 482             signInfo.rgCrlEncoded = crlBlob;
 483         }
 484         else
 485             ret = FALSE;
 486     }
 487     if (pSignPara->dwFlags || pSignPara->dwInnerContentType)
 488         FIXME("unimplemented feature\n");
 489
 490     if (ret)
 491         msg = CryptMsgOpenToEncode(pSignPara->dwMsgEncodingType,
 492          fDetachedSignature ? CMSG_DETACHED_FLAG : 0, CMSG_SIGNED, &signInfo,
 493          NULL, NULL);
 494     if (msg)
 495     {
 496         if (cToBeSigned)
 497         {
 498             for (i = 0; ret && i < cToBeSigned; ++i)
 499             {
 500                 ret = CryptMsgUpdate(msg, rgpbToBeSigned[i], rgcbToBeSigned[i],
 501                  i == cToBeSigned - 1);
 502             }
 503         }
 504         else
 505             ret = CryptMsgUpdate(msg, NULL, 0, TRUE);
 506         if (ret)
 507             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbSignedBlob,
 508              pcbSignedBlob);
 509         CryptMsgClose(msg);
 510     }
 511     else
 512         ret = FALSE;
 513
 514     CryptMemFree(crlBlob);
 515     CryptMemFree(certBlob);
 516     if (freeProv)
 517         CryptReleaseContext(hCryptProv, 0);
 518     return ret;
 519 }
 520
 521 BOOL WINAPI CryptEncryptMessage(PCRYPT_ENCRYPT_MESSAGE_PARA pEncryptPara,
 522  DWORD cRecipientCert, PCCERT_CONTEXT rgpRecipientCert[],
 523  const BYTE *pbToBeEncrypted, DWORD cbToBeEncrypted, BYTE *pbEncryptedBlob,
 524  DWORD *pcbEncryptedBlob)
 525 {
 526     BOOL ret = TRUE;
 527     DWORD i;
 528     PCERT_INFO *certInfo = NULL;
 529     CMSG_ENVELOPED_ENCODE_INFO envelopedInfo;
 530     HCRYPTMSG msg = 0;
 531
 532     TRACE("(%p, %d, %p, %p, %d, %p, %p)\n", pEncryptPara, cRecipientCert,
 533      rgpRecipientCert, pbToBeEncrypted, cbToBeEncrypted, pbEncryptedBlob,
 534      pcbEncryptedBlob);
 535
 536     if (pEncryptPara->cbSize != sizeof(CRYPT_ENCRYPT_MESSAGE_PARA) ||
 537      GET_CMSG_ENCODING_TYPE(pEncryptPara->dwMsgEncodingType) !=
 538      PKCS_7_ASN_ENCODING)
 539     {
 540         *pcbEncryptedBlob = 0;
 541         SetLastError(E_INVALIDARG);
 542         return FALSE;
 543     }
 544
 545     memset(&envelopedInfo, 0, sizeof(envelopedInfo));
 546     envelopedInfo.cbSize = sizeof(envelopedInfo);
 547     envelopedInfo.hCryptProv = pEncryptPara->hCryptProv;
 548     envelopedInfo.ContentEncryptionAlgorithm =
 549      pEncryptPara->ContentEncryptionAlgorithm;
 550     envelopedInfo.pvEncryptionAuxInfo = pEncryptPara->pvEncryptionAuxInfo;
 551
 552     if (cRecipientCert)
 553     {
 554         certInfo = CryptMemAlloc(sizeof(PCERT_INFO) * cRecipientCert);
 555         if (certInfo)
 556         {
 557             for (i = 0; i < cRecipientCert; ++i)
 558                 certInfo[i] = rgpRecipientCert[i]->pCertInfo;
 559             envelopedInfo.cRecipients = cRecipientCert;
 560             envelopedInfo.rgpRecipientCert = certInfo;
 561         }
 562         else
 563             ret = FALSE;
 564     }
 565
 566     if (ret)
 567         msg = CryptMsgOpenToEncode(pEncryptPara->dwMsgEncodingType, 0,
 568          CMSG_ENVELOPED, &envelopedInfo, NULL, NULL);
 569     if (msg)
 570     {
 571         ret = CryptMsgUpdate(msg, pbToBeEncrypted, cbToBeEncrypted, TRUE);
 572         if (ret)
 573             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbEncryptedBlob,
 574              pcbEncryptedBlob);
 575         CryptMsgClose(msg);
 576     }
 577     else
 578         ret = FALSE;
 579
 580     CryptMemFree(certInfo);
 581     if (!ret) *pcbEncryptedBlob = 0;
 582     return ret;
 583 }