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c++ - MS Crypto API behavior on Windows XP vs Vista/7 -

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i'm trying understand how public key imported pem format (sample included in code below) across xp, vista , windows 7. sample code import key on both xp , windows vista/7, not same way.

on windows xp, string "(prototype)" required in cryptographic provider's name, , allows call cryptimportpublickeyinfo pass.

on windows 7, "(prototype)" provider apparently present, not support call cryptimportpublickeyinfo, confusing.

what might correct implementation between these operating systems? necessary detect xp , request name "(prototype)", , without other operating systems? possible that still fail on xp systems?

or, there way detect confusing behavior , select whichever cryptographic provider support necessary call?

output on windows 7:

analyzing cryptographic support for:      "microsoft enhanced rsa , aes cryptographic provider"      cryptacquirecontext success.      cryptacquirecontext.1 success.      cryptstringtobinary.2 success.      cryptdecodeobjectex success.      cryptimportpublickeyinfo success.      success. analyzing cryptographic support for:      "microsoft enhanced rsa , aes cryptographic provider (prototype)"      cryptacquirecontext success.      cryptacquirecontext.1 success.      cryptstringtobinary.2 success.      cryptdecodeobjectex success.      cryptimportpublickeyinfo failed****.

output on windows xp:

analyzing cryptographic support for:      "microsoft enhanced rsa , aes cryptographic provider"      cryptacquirecontext success.      cryptacquirecontext.1 success.      cryptstringtobinary.2 success.      cryptdecodeobjectex success.      cryptimportpublickeyinfo failed****. analyzing cryptographic support for:      "microsoft enhanced rsa , aes cryptographic provider (prototype)"      cryptacquirecontext success.      cryptacquirecontext.1 success.      cryptstringtobinary.2 success.      cryptdecodeobjectex success.      cryptimportpublickeyinfo success.      success.

c++ source code produces output: (requires crypt32.lib)

#include <stdio.h> #include <tchar.h> #include <windows.h> #include <wincrypt.h>  bool windowsacquireprovidercontext(hcryptprov *phandleprov, lpctstr pprovidername); bool analyzecryptographicsupport(lpctstr pprovidername);  int _tmain(int argc, _tchar* argv[]) {     analyzecryptographicsupport(ms_enh_rsa_aes_prov);     analyzecryptographicsupport(l"microsoft enhanced rsa , aes cryptographic provider (prototype)");     return 0; }  bool windowsacquireprovidercontext(hcryptprov *phandleprov, lpctstr pprovidername) {     wchar *pcontainername = l"blah blah blah";     if(!cryptacquirecontext(phandleprov, pcontainername, pprovidername, prov_rsa_aes, crypt_silent)) {         if(getlasterror() == nte_bad_keyset) {             if(cryptacquirecontext(phandleprov, pcontainername, pprovidername, prov_rsa_aes, crypt_newkeyset|crypt_silent)) {                 return true;             }         }      }     return true; }  lpcwstr pwszpempublickey =      l"-----begin public key-----\r\n"     l"migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqc6guvcbn92bahlwoskki8xkg9q\r\n"     l"vq863+c4cowc6hzjojc011pjffibu8/pg1ei8fzjdbmtrfajtriyw1/spboh0qqe\r\n"     l"ehant8qwn+s5m9xgdjowtbjkcnu3ohovjju3c8johqqnrwlfghjh4vnwstdiwuuy\r\n"     l"smwpwuhobsnelgbgeqidaqab\r\n"     l"-----end public key-----\r\n"; int pempublickeysize = wcslen(pwszpempublickey);  bool analyzecryptographicsupport(lpctstr pprovidername) {      printf("analyzing cryptographic support for:\r\n");     wprintf(l"\t \"%s\"\r\n", pprovidername);      hcryptprov hprov;     if(!windowsacquireprovidercontext(&hprov, pprovidername)) {         wprintf(l"\t cryptacquirecontext failed.\r\n");         return false;     }     wprintf(l"\t cryptacquirecontext success.\r\n");      dword blobsize;      if(!cryptstringtobinary(pwszpempublickey, pempublickeysize, crypt_string_base64_any,  null, &blobsize, null, null)) {         cryptreleasecontext(hprov, 0);         wprintf(l"\t cryptstringtobinary.1 failed****.\r\n");         return false;     }     wprintf(l"\t cryptacquirecontext.1 success.\r\n");      byte *pblob = (byte *)malloc(blobsize);      if(!cryptstringtobinary(pwszpempublickey, pempublickeysize, crypt_string_base64_any,  pblob, &blobsize, null, null)) {         free(pblob);         cryptreleasecontext(hprov, 0);         wprintf(l"\t cryptstringtobinary.2 failed****.\r\n");         return false;     }     wprintf(l"\t cryptstringtobinary.2 success.\r\n");      cert_public_key_info *publickeyinfo;     dword publickeyinfolen;     hcryptkey hpublickey;      if(!cryptdecodeobjectex(x509_asn_encoding|pkcs_7_asn_encoding, x509_public_key_info, pblob, blobsize, crypt_decode_alloc_flag, null, &publickeyinfo, &publickeyinfolen)) {         free(pblob);         cryptreleasecontext(hprov, 0);         wprintf(l"\t cryptdecodeobjectex failed****.\r\n");         return false;     }     wprintf(l"\t cryptdecodeobjectex success.\r\n");      if(!cryptimportpublickeyinfo(hprov, x509_asn_encoding|pkcs_7_asn_encoding, publickeyinfo, &hpublickey)) {         localfree(publickeyinfo);         free(pblob);         cryptreleasecontext(hprov, 0);         wprintf(l"\t cryptimportpublickeyinfo failed****.\r\n");         return false;     }     wprintf(l"\t cryptimportpublickeyinfo success.\r\n");      cryptdestroykey(hpublickey);     localfree(publickeyinfo);     free(pblob);     cryptreleasecontext(hprov, 0);      wprintf(l"\t success.\r\n");     return true; }

the reason of problem describes easy: microsoft renamed aes cryptographic provider

  • "microsoft enhanced rsa , aes cryptographic provider (prototype)" in windows xp
  • "microsoft enhanced rsa , aes cryptographic provider" in later versions of operation systems.

in wincrypt.h defined corresponding constants ms_enh_rsa_aes_prov , ms_enh_rsa_aes_prov_xp can use.

if don't want test version of operation system can use cryptacquirecontext null pszprovider (and continue use prov_rsa_aes dwprovtype). in code can include analyzecryptographicsupport(null);.

you can examine "name" value of registry key

hkey_local_machine\software\microsoft\cryptography\defaults\provider types\type 024

to see name of default prov_rsa_aes provider.


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