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     memcpy(&info.HashAlgorithm, &pHashPara->HashAlgorithm,
 289      sizeof(info.HashAlgorithm));
 290     info.pvHashAuxInfo = pHashPara->pvHashAuxInfo;
 291     msg = CryptMsgOpenToEncode(pHashPara->dwMsgEncodingType, flags, CMSG_HASHED,
 292      &info, NULL, NULL);
 293     if (msg)
 294     {
 295         for (i = 0, ret = TRUE; ret && i < cToBeHashed; i++)
 296             ret = CryptMsgUpdate(msg, rgpbToBeHashed[i], rgcbToBeHashed[i], i == cToBeHashed - 1);
 297         if (ret)
 298         {
 299             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbHashedBlob,
 300              pcbHashedBlob);
 301             if (ret && pcbComputedHash)
 302                 ret = CryptMsgGetParam(msg, CMSG_COMPUTED_HASH_PARAM, 0,
 303                  pbComputedHash, pcbComputedHash);
 304         }
 305         CryptMsgClose(msg);
 306     }
 307     return ret;
 308 }
 309
 310 BOOL WINAPI CryptVerifyDetachedMessageHash(PCRYPT_HASH_MESSAGE_PARA pHashPara,
 311  BYTE *pbDetachedHashBlob, DWORD cbDetachedHashBlob, DWORD cToBeHashed,
 312  const BYTE *rgpbToBeHashed[], DWORD rgcbToBeHashed[], BYTE *pbComputedHash,
 313  DWORD *pcbComputedHash)
 314 {
 315     HCRYPTMSG msg;
 316     BOOL ret = FALSE;
 317
 318     TRACE("(%p, %p, %d, %d, %p, %p, %p, %p)\n", pHashPara, pbDetachedHashBlob,
 319      cbDetachedHashBlob, cToBeHashed, rgpbToBeHashed, rgcbToBeHashed,
 320      pbComputedHash, pcbComputedHash);
 321
 322     if (pHashPara->cbSize != sizeof(CRYPT_HASH_MESSAGE_PARA))
 323     {
 324         SetLastError(E_INVALIDARG);
 325         return FALSE;
 326     }
 327     if (GET_CMSG_ENCODING_TYPE(pHashPara->dwMsgEncodingType) !=
 328      PKCS_7_ASN_ENCODING)
 329     {
 330         SetLastError(E_INVALIDARG);
 331         return FALSE;
 332     }
 333     msg = CryptMsgOpenToDecode(pHashPara->dwMsgEncodingType, CMSG_DETACHED_FLAG,
 334      0, pHashPara->hCryptProv, NULL, NULL);
 335     if (msg)
 336     {
 337         DWORD i;
 338
 339         ret = CryptMsgUpdate(msg, pbDetachedHashBlob, cbDetachedHashBlob, TRUE);
 340         if (ret)
 341         {
 342             if (cToBeHashed)
 343             {
 344                 for (i = 0; ret && i < cToBeHashed; i++)
 345                 {
 346                     ret = CryptMsgUpdate(msg, rgpbToBeHashed[i],
 347                      rgcbToBeHashed[i], i == cToBeHashed - 1);
 348                 }
 349             }
 350             else
 351                 ret = CryptMsgUpdate(msg, NULL, 0, TRUE);
 352         }
 353         if (ret)
 354         {
 355             ret = CryptMsgControl(msg, 0, CMSG_CTRL_VERIFY_HASH, NULL);
 356             if (ret && pcbComputedHash)
 357                 ret = CryptMsgGetParam(msg, CMSG_COMPUTED_HASH_PARAM, 0,
 358                  pbComputedHash, pcbComputedHash);
 359         }
 360         CryptMsgClose(msg);
 361     }
 362     return ret;
 363 }
 364
 365 BOOL WINAPI CryptVerifyMessageHash(PCRYPT_HASH_MESSAGE_PARA pHashPara,
 366  BYTE *pbHashedBlob, DWORD cbHashedBlob, BYTE *pbToBeHashed,
 367  DWORD *pcbToBeHashed, BYTE *pbComputedHash, DWORD *pcbComputedHash)
 368 {
 369     HCRYPTMSG msg;
 370     BOOL ret = FALSE;
 371
 372     TRACE("(%p, %p, %d, %p, %p, %p, %p)\n", pHashPara, pbHashedBlob,
 373      cbHashedBlob, pbToBeHashed, pcbToBeHashed, pbComputedHash,
 374      pcbComputedHash);
 375
 376     if (pHashPara->cbSize != sizeof(CRYPT_HASH_MESSAGE_PARA))
 377     {
 378         SetLastError(E_INVALIDARG);
 379         return FALSE;
 380     }
 381     if (GET_CMSG_ENCODING_TYPE(pHashPara->dwMsgEncodingType) !=
 382      PKCS_7_ASN_ENCODING)
 383     {
 384         SetLastError(E_INVALIDARG);
 385         return FALSE;
 386     }
 387     msg = CryptMsgOpenToDecode(pHashPara->dwMsgEncodingType, 0, 0,
 388      pHashPara->hCryptProv, NULL, NULL);
 389     if (msg)
 390     {
 391         ret = CryptMsgUpdate(msg, pbHashedBlob, cbHashedBlob, TRUE);
 392         if (ret)
 393         {
 394             ret = CryptMsgControl(msg, 0, CMSG_CTRL_VERIFY_HASH, NULL);
 395             if (ret && pcbToBeHashed)
 396                 ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0,
 397                  pbToBeHashed, pcbToBeHashed);
 398             if (ret && pcbComputedHash)
 399                 ret = CryptMsgGetParam(msg, CMSG_COMPUTED_HASH_PARAM, 0,
 400                  pbComputedHash, pcbComputedHash);
 401         }
 402         CryptMsgClose(msg);
 403     }
 404     return ret;
 405 }
 406
 407 BOOL WINAPI CryptSignMessage(PCRYPT_SIGN_MESSAGE_PARA pSignPara,
 408  BOOL fDetachedSignature, DWORD cToBeSigned, const BYTE *rgpbToBeSigned[],
 409  DWORD rgcbToBeSigned[], BYTE *pbSignedBlob, DWORD *pcbSignedBlob)
 410 {
 411     HCRYPTPROV hCryptProv;
 412     BOOL ret, freeProv = FALSE;
 413     DWORD i, keySpec;
 414     PCERT_BLOB certBlob = NULL;
 415     PCRL_BLOB crlBlob = NULL;
 416     CMSG_SIGNED_ENCODE_INFO signInfo;
 417     CMSG_SIGNER_ENCODE_INFO signer;
 418     HCRYPTMSG msg = 0;
 419
 420     TRACE("(%p, %d, %d, %p, %p, %p, %p)\n", pSignPara, fDetachedSignature,
 421      cToBeSigned, rgpbToBeSigned, rgcbToBeSigned, pbSignedBlob, pcbSignedBlob);
 422
 423     if (pSignPara->cbSize != sizeof(CRYPT_SIGN_MESSAGE_PARA) ||
 424      GET_CMSG_ENCODING_TYPE(pSignPara->dwMsgEncodingType) !=
 425      PKCS_7_ASN_ENCODING)
 426     {
 427         *pcbSignedBlob = 0;
 428         SetLastError(E_INVALIDARG);
 429         return FALSE;
 430     }
 431     if (!pSignPara->pSigningCert)
 432         return TRUE;
 433
 434     ret = CryptAcquireCertificatePrivateKey(pSignPara->pSigningCert,
 435      CRYPT_ACQUIRE_CACHE_FLAG, NULL, &hCryptProv, &keySpec, &freeProv);
 436     if (!ret)
 437         return FALSE;
 438
 439     memset(&signer, 0, sizeof(signer));
 440     signer.cbSize = sizeof(signer);
 441     signer.pCertInfo = pSignPara->pSigningCert->pCertInfo;
 442     signer.hCryptProv = hCryptProv;
 443     signer.dwKeySpec = keySpec;
 444     signer.HashAlgorithm = pSignPara->HashAlgorithm;
 445     signer.pvHashAuxInfo = pSignPara->pvHashAuxInfo;
 446     signer.cAuthAttr = pSignPara->cAuthAttr;
 447     signer.rgAuthAttr = pSignPara->rgAuthAttr;
 448     signer.cUnauthAttr = pSignPara->cUnauthAttr;
 449     signer.rgUnauthAttr = pSignPara->rgUnauthAttr;
 450
 451     memset(&signInfo, 0, sizeof(signInfo));
 452     signInfo.cbSize = sizeof(signInfo);
 453     signInfo.cSigners = 1;
 454     signInfo.rgSigners = &signer;
 455
 456     if (pSignPara->cMsgCert)
 457     {
 458         certBlob = CryptMemAlloc(sizeof(CERT_BLOB) * pSignPara->cMsgCert);
 459         if (certBlob)
 460         {
 461             for (i = 0; i < pSignPara->cMsgCert; ++i)
 462             {
 463                 certBlob[i].cbData = pSignPara->rgpMsgCert[i]->cbCertEncoded;
 464                 certBlob[i].pbData = pSignPara->rgpMsgCert[i]->pbCertEncoded;
 465             }
 466             signInfo.cCertEncoded = pSignPara->cMsgCert;
 467             signInfo.rgCertEncoded = certBlob;
 468         }
 469         else
 470             ret = FALSE;
 471     }
 472     if (pSignPara->cMsgCrl)
 473     {
 474         crlBlob = CryptMemAlloc(sizeof(CRL_BLOB) * pSignPara->cMsgCrl);
 475         if (crlBlob)
 476         {
 477             for (i = 0; i < pSignPara->cMsgCrl; ++i)
 478             {
 479                 crlBlob[i].cbData = pSignPara->rgpMsgCrl[i]->cbCrlEncoded;
 480                 crlBlob[i].pbData = pSignPara->rgpMsgCrl[i]->pbCrlEncoded;
 481             }
 482             signInfo.cCrlEncoded = pSignPara->cMsgCrl;
 483             signInfo.rgCrlEncoded = crlBlob;
 484         }
 485         else
 486             ret = FALSE;
 487     }
 488     if (pSignPara->dwFlags || pSignPara->dwInnerContentType)
 489         FIXME("unimplemented feature\n");
 490
 491     if (ret)
 492         msg = CryptMsgOpenToEncode(pSignPara->dwMsgEncodingType,
 493          fDetachedSignature ? CMSG_DETACHED_FLAG : 0, CMSG_SIGNED, &signInfo,
 494          NULL, NULL);
 495     if (msg)
 496     {
 497         if (cToBeSigned)
 498         {
 499             for (i = 0; ret && i < cToBeSigned; ++i)
 500             {
 501                 ret = CryptMsgUpdate(msg, rgpbToBeSigned[i], rgcbToBeSigned[i],
 502                  i == cToBeSigned - 1);
 503             }
 504         }
 505         else
 506             ret = CryptMsgUpdate(msg, NULL, 0, TRUE);
 507         if (ret)
 508             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbSignedBlob,
 509              pcbSignedBlob);
 510         CryptMsgClose(msg);
 511     }
 512     else
 513         ret = FALSE;
 514
 515     CryptMemFree(crlBlob);
 516     CryptMemFree(certBlob);
 517     if (freeProv)
 518         CryptReleaseContext(hCryptProv, 0);
 519     return ret;
 520 }
 521
 522 BOOL WINAPI CryptEncryptMessage(PCRYPT_ENCRYPT_MESSAGE_PARA pEncryptPara,
 523  DWORD cRecipientCert, PCCERT_CONTEXT rgpRecipientCert[],
 524  const BYTE *pbToBeEncrypted, DWORD cbToBeEncrypted, BYTE *pbEncryptedBlob,
 525  DWORD *pcbEncryptedBlob)
 526 {
 527     BOOL ret = TRUE;
 528     DWORD i;
 529     PCERT_INFO *certInfo = NULL;
 530     CMSG_ENVELOPED_ENCODE_INFO envelopedInfo;
 531     HCRYPTMSG msg = 0;
 532
 533     TRACE("(%p, %d, %p, %p, %d, %p, %p)\n", pEncryptPara, cRecipientCert,
 534      rgpRecipientCert, pbToBeEncrypted, cbToBeEncrypted, pbEncryptedBlob,
 535      pcbEncryptedBlob);
 536
 537     if (pEncryptPara->cbSize != sizeof(CRYPT_ENCRYPT_MESSAGE_PARA) ||
 538      GET_CMSG_ENCODING_TYPE(pEncryptPara->dwMsgEncodingType) !=
 539      PKCS_7_ASN_ENCODING)
 540     {
 541         *pcbEncryptedBlob = 0;
 542         SetLastError(E_INVALIDARG);
 543         return FALSE;
 544     }
 545
 546     memset(&envelopedInfo, 0, sizeof(envelopedInfo));
 547     envelopedInfo.cbSize = sizeof(envelopedInfo);
 548     envelopedInfo.hCryptProv = pEncryptPara->hCryptProv;
 549     envelopedInfo.ContentEncryptionAlgorithm =
 550      pEncryptPara->ContentEncryptionAlgorithm;
 551     envelopedInfo.pvEncryptionAuxInfo = pEncryptPara->pvEncryptionAuxInfo;
 552
 553     if (cRecipientCert)
 554     {
 555         certInfo = CryptMemAlloc(sizeof(PCERT_INFO) * cRecipientCert);
 556         if (certInfo)
 557         {
 558             for (i = 0; i < cRecipientCert; ++i)
 559                 certInfo[i] = rgpRecipientCert[i]->pCertInfo;
 560             envelopedInfo.cRecipients = cRecipientCert;
 561             envelopedInfo.rgpRecipientCert = certInfo;
 562         }
 563         else
 564             ret = FALSE;
 565     }
 566
 567     if (ret)
 568         msg = CryptMsgOpenToEncode(pEncryptPara->dwMsgEncodingType, 0,
 569          CMSG_ENVELOPED, &envelopedInfo, NULL, NULL);
 570     if (msg)
 571     {
 572         ret = CryptMsgUpdate(msg, pbToBeEncrypted, cbToBeEncrypted, TRUE);
 573         if (ret)
 574             ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, pbEncryptedBlob,
 575              pcbEncryptedBlob);
 576         CryptMsgClose(msg);
 577     }
 578     else
 579         ret = FALSE;
 580
 581     CryptMemFree(certInfo);
 582     if (!ret) *pcbEncryptedBlob = 0;
 583     return ret;
 584 }