private static void EnumerateProviders()
{
if (Providers != null)
{
return;
}
lock (Locker)
{
if (Providers != null)
{
return;
}
Providers = new List <ProviderInfo>();
var dwIndex = 0;
int dwType = 1;
int cbName = 0;
while (CryptoApiEx.CryptEnumProviders(dwIndex, IntPtr.Zero, 0, ref dwType, null, ref cbName))
{
var pszName = new StringBuilder((int)cbName + 1);
if (!CryptoApiEx.CryptEnumProviders(dwIndex++, IntPtr.Zero, 0, ref dwType, pszName, ref cbName))
{
continue;
}
Providers.Add(new ProviderInfo()
{
ProviderType = dwType,
ProviderName = pszName.ToString()
});
}
foreach (var providerInfo in Providers)
{
providerInfo.Initialize();
}
}
}
public void Initialize()
{
var reOid = new Regex("^[0-9]+([.][0-9]+)+$", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
IntPtr cspHandler = IntPtr.Zero;
IntPtr pnt = IntPtr.Zero;
try
{
if (!CryptoApi.CryptAcquireContext(ref cspHandler, null, ProviderName, ProviderType, Constants.CryptVerifycontext))
{
throw new Win32Exception();
}
int dwDataLen = Marshal.SizeOf(typeof(CryptoApiEx.PROV_ENUMALGS_EX)) * 2;
pnt = Marshal.AllocHGlobal(dwDataLen);
uint dwFlags = 1;
while (CryptoApiEx.CryptGetProvParam(cspHandler, Constants.PP_ENUMALGS_EX, pnt, ref dwDataLen, dwFlags))
{
var data = (CryptoApiEx.PROV_ENUMALGS_EX)Marshal.PtrToStructure(pnt, typeof(CryptoApiEx.PROV_ENUMALGS_EX));
IntPtr oidPtr = CryptoApiEx.CertAlgIdToOID(data.aiAlgid);
var oid = Marshal.PtrToStringAnsi(oidPtr);
if (string.IsNullOrEmpty(oid) || !reOid.IsMatch(oid))
{
oid = string.Empty;
}
this.Add(new ProviderAlgo()
{
AlgId = data.aiAlgid,
Oid = oid,
Name = data.szName,
LongName = data.szLongName,
MinLen = data.dwMinLen,
MaxLen = data.dwMaxLen,
DefaultLen = data.dwDefaultLen,
Protocols = data.dwProtocols
});
dwFlags = 2;
}
}
finally
{
if (pnt != IntPtr.Zero)
{
Marshal.FreeHGlobal(pnt);
}
if (cspHandler != IntPtr.Zero)
{
CryptoApi.CryptReleaseContext(cspHandler, 0);
}
}
}
private void LookForSignatureGroup(ProviderAlgo hashAlgo, ProviderAlgo signAlgo)
{
int[] algIds = new[] { hashAlgo.AlgId, signAlgo.AlgId };
var ptr = CryptoApiEx.CryptFindOIDInfo(CryptoApiEx.CRYPT_OID_INFO_SIGN_KEY, algIds, CryptoApiEx.CRYPT_SIGN_ALG_OID_GROUP_ID);
if (ptr == IntPtr.Zero)
{
return;
}
var oidInfo = (CryptoApiEx.CRYPT_OID_INFO)Marshal.PtrToStructure(ptr, typeof(CryptoApiEx.CRYPT_OID_INFO));
var oid = Marshal.PtrToStringAnsi(oidInfo.pszOID);
//
SignGroups.Add(new ProviderSignGroup()
{
AlgId = oidInfo.Algid,
HashAlgo = hashAlgo,
SignAlgo = signAlgo,
Oid = oid,
Name = Marshal.PtrToStringUni(oidInfo.pwszName)
});
}