/// <include file='doc\DSACryptoServiceProvider.uex' path='docs/doc[@for="DSACryptoServiceProvider.DSACryptoServiceProvider3"]/*' />
public DSACryptoServiceProvider(int dwKeySize, CspParameters parameters)
{
int hr;
//
// Save the CSP Parameters
//
if (parameters == null)
{
_parameters = new CspParameters(PROV_DSS_DH, null, null, m_UseMachineKeyStore);
}
else
{
// Check the parameter options: specifying either a key container name or UseDefaultKeyContainer flag
// requires unmanaged code permission
if (((parameters.Flags & CspProviderFlags.UseDefaultKeyContainer) != 0) ||
((parameters.KeyContainerName != null) && (parameters.KeyContainerName.Length > 0)))
{
_UCpermission.Demand();
// If we specified a key container name for this key, then mark it persisted
if ((parameters.KeyContainerName != null) && (parameters.KeyContainerName.Length > 0))
{
// CAPI doesn't accept Container Names longer than 260 characters
if (parameters.KeyContainerName.Length > 260)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeyContainerName"));
}
_persistKeyInCSP = true;
}
}
_parameters = parameters;
}
//
// Create the CSP container for this set of keys
//
_hCSP = IntPtr.Zero;
_hKey = IntPtr.Zero;
hr = _CreateCSP(_parameters, ref _hCSP);
if (hr != 0)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CouldNotAcquire"));
}
if (_hCSP == IntPtr.Zero)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CouldNotAcquire"));
}
//
// If no key spec has been specified, then set it to be
// AT_KEYEXCHANGE, if a CALG_* has been specified, then
// map that to AT_* value
if (_parameters.KeyNumber == -1)
{
_parameters.KeyNumber = AT_SIGNATURE;
}
else if (_parameters.KeyNumber == CALG_DSA_SIGN)
{
_parameters.KeyNumber = AT_SIGNATURE;
}
// If the key already exists, use it, else generate a new one
hr = _GetUserKey(_hCSP, _parameters.KeyNumber, ref _hKey);
if (hr != 0)
{
_hKey = _GenerateKey(_hCSP, _parameters.KeyNumber, dwKeySize << 16);
if (_hKey == IntPtr.Zero)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CreateKey"));
}
// We just gen'd a new key pair, so we have both halves.
_containerContents = KeyContainerContents.PublicAndExportablePrivate;
}
else
{
// If the key already exists, make sure to persist it
_persistKeyInCSP = true;
_containerContents = KeyContainerContents.Unknown;
}
_dwKeySize = dwKeySize;
// Create the Hash instance
sha1 = SHA1.Create();
_CSPHandleProtector = new __CSPHandleProtector(_hCSP, _persistKeyInCSP, _parameters);
_KeyHandleProtector = new __KeyHandleProtector(_hKey);
}
internal RSACryptoServiceProvider(int dwKeySize, CspParameters parameters, bool useDefaultKeySize)
{
int hr;
//
// Save the CSP Parameters
//
if (parameters == null)
{
_parameters = new CspParameters(1, null, null, m_UseMachineKeyStore);
}
else
{
// Check the parameter options: specifying either a key container name or UseDefaultKeyContainer flag
// requires unmanaged code permission
if (((parameters.Flags & CspProviderFlags.UseDefaultKeyContainer) != 0) ||
((parameters.KeyContainerName != null) && (parameters.KeyContainerName.Length > 0)))
{
_UCpermission.Demand();
// If we specified a key container name for this key, then mark it persisted
if ((parameters.KeyContainerName != null) && (parameters.KeyContainerName.Length > 0))
{
// CAPI doesn't accept Container Names longer than 260 characters
if (parameters.KeyContainerName.Length > 260)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_InvalidKeyContainerName"));
}
_persistKeyInCSP = true;
}
}
_parameters = parameters;
}
//
// If no key spec has been specified, then set it to be
// AT_KEYEXCHANGE, if a CALG_* has been specified, then
// map that to AT_* value
if (_parameters.KeyNumber == -1)
{
_parameters.KeyNumber = AT_KEYEXCHANGE;
}
else if (_parameters.KeyNumber == CALG_RSA_KEYX)
{
_parameters.KeyNumber = AT_KEYEXCHANGE;
}
else if (_parameters.KeyNumber == CALG_RSA_SIGN)
{
_parameters.KeyNumber = AT_SIGNATURE;
}
// See if we have the Enhanced RSA provider on this machine
_hasEnhancedProvider = HasEnhancedProvider();
// Now determine legal key sizes. If AT_SIGNATURE, then 384 -- 16386. Otherwise, depends on
// whether the strong provider is present.
if (_parameters.KeyNumber == AT_SIGNATURE)
{
LegalKeySizesValue = new KeySizes[1] {
new KeySizes(384, 16384, 8)
};
}
else if (_hasEnhancedProvider)
{
// it is, we have the strong provider
LegalKeySizesValue = new KeySizes[1] {
new KeySizes(384, 16384, 8)
};
}
else
{
// nope, all we have is the base provider
LegalKeySizesValue = new KeySizes[1] {
new KeySizes(384, 512, 8)
};
// tone down the default key size
_defaultKeySize = 512;
}
// Set the key size; this will throw an exception if dwKeySize is invalid.
// Don't check if dwKeySize == 0, since that's the "default size", however
// *our* default should be 1024 if the CSP can handle it. So, if the
// key size was unspecified in a constructor to us, it'll be -1 here and
// change it to the default size. If the user really put in a 0 give him back
// the default for the CSP whatever it is.
if (useDefaultKeySize)
{
dwKeySize = _defaultKeySize;
}
if (dwKeySize != 0)
{
KeySize = dwKeySize;
}
_dwKeySize = dwKeySize;
//
// Create the CSP container for this set of keys
//
_hCSP = IntPtr.Zero;
_hKey = IntPtr.Zero;
hr = _CreateCSP(_parameters, ref _hCSP);
if (hr != 0)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CouldNotAcquire"));
}
if (_hCSP == IntPtr.Zero)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CouldNotAcquire"));
}
// If the key already exists, use it, else generate a new one
hr = _GetUserKey(_hCSP, _parameters.KeyNumber, ref _hKey);
if (hr != 0)
{
_hKey = _GenerateKey(_hCSP, _parameters.KeyNumber, dwKeySize << 16);
if (_hKey == IntPtr.Zero)
{
throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_CreateKey"));
}
// We just gen'd a new key pair, so we have both halves.
_containerContents = KeyContainerContents.PublicAndExportablePrivate;
}
else
{
// If the key already exists, make sure to persist it
_persistKeyInCSP = true;
// we have both halves, but we don't know if it's exportable or not
_containerContents = KeyContainerContents.Unknown;
}
_CSPHandleProtector = new __CSPHandleProtector(_hCSP, _persistKeyInCSP, _parameters);
_KeyHandleProtector = new __KeyHandleProtector(_hKey);
}