internal AlgorithmIdentifier(CAPI.CRYPT_ALGORITHM_IDENTIFIER algorithmIdentifier)
{
int keyLength = 0;
uint cbDecodedValue = 0U;
SafeLocalAllocHandle decodedValue = SafeLocalAllocHandle.InvalidHandle;
byte[] numArray = new byte[0];
uint num = X509Utils.OidToAlgId(algorithmIdentifier.pszObjId);
switch (num)
{
case 26114U:
if (algorithmIdentifier.Parameters.cbData > 0U)
{
if (!CAPI.DecodeObject(new IntPtr(41L), algorithmIdentifier.Parameters.pbData, algorithmIdentifier.Parameters.cbData, out decodedValue, out cbDecodedValue))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
CAPI.CRYPT_RC2_CBC_PARAMETERS rc2CbcParameters = (CAPI.CRYPT_RC2_CBC_PARAMETERS)Marshal.PtrToStructure(decodedValue.DangerousGetHandle(), typeof(CAPI.CRYPT_RC2_CBC_PARAMETERS));
switch (rc2CbcParameters.dwVersion)
{
case 52U:
keyLength = 56;
break;
case 58U:
keyLength = 128;
break;
case 160U:
keyLength = 40;
break;
}
if (rc2CbcParameters.fIV)
{
numArray = (byte[])rc2CbcParameters.rgbIV.Clone();
break;
}
else
{
break;
}
}
else
{
break;
}
case 26625U:
case 26113U:
case 26115U:
if (algorithmIdentifier.Parameters.cbData > 0U)
{
if (!CAPI.DecodeObject(new IntPtr(25L), algorithmIdentifier.Parameters.pbData, algorithmIdentifier.Parameters.cbData, out decodedValue, out cbDecodedValue))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
if (cbDecodedValue > 0U)
{
if ((int)num == 26625)
{
CAPI.CRYPTOAPI_BLOB cryptoapiBlob = (CAPI.CRYPTOAPI_BLOB)Marshal.PtrToStructure(decodedValue.DangerousGetHandle(), typeof(CAPI.CRYPTOAPI_BLOB));
if (cryptoapiBlob.cbData > 0U)
{
numArray = new byte[(IntPtr)cryptoapiBlob.cbData];
Marshal.Copy(cryptoapiBlob.pbData, numArray, 0, numArray.Length);
}
}
else
{
numArray = new byte[(IntPtr)cbDecodedValue];
Marshal.Copy(decodedValue.DangerousGetHandle(), numArray, 0, numArray.Length);
}
}
}
keyLength = (int)num != 26625 ? ((int)num != 26113 ? 192 : 64) : 128 - numArray.Length * 8;
break;
default:
if (algorithmIdentifier.Parameters.cbData > 0U)
{
numArray = new byte[(IntPtr)algorithmIdentifier.Parameters.cbData];
Marshal.Copy(algorithmIdentifier.Parameters.pbData, numArray, 0, numArray.Length);
break;
}
else
{
break;
}
}
this.Reset(new Oid(algorithmIdentifier.pszObjId), keyLength, numArray);
decodedValue.Dispose();
}
internal AlgorithmIdentifier(CAPI.CRYPT_ALGORITHM_IDENTIFIER algorithmIdentifier)
{
int keyLength = 0;
uint cbParameters = 0;
SafeLocalAllocHandle pbParameters = SafeLocalAllocHandle.InvalidHandle;
byte[] parameters = new byte[0];
uint algId = X509Utils.OidToAlgId(algorithmIdentifier.pszObjId);
if (algId == CAPI.CALG_RC2)
{
if (algorithmIdentifier.Parameters.cbData > 0)
{
if (!CAPI.DecodeObject(new IntPtr(CAPI.PKCS_RC2_CBC_PARAMETERS),
algorithmIdentifier.Parameters.pbData,
algorithmIdentifier.Parameters.cbData,
out pbParameters,
out cbParameters))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
CAPI.CRYPT_RC2_CBC_PARAMETERS rc2Parameters = (CAPI.CRYPT_RC2_CBC_PARAMETERS)Marshal.PtrToStructure(pbParameters.DangerousGetHandle(), typeof(CAPI.CRYPT_RC2_CBC_PARAMETERS));
switch (rc2Parameters.dwVersion)
{
case CAPI.CRYPT_RC2_40BIT_VERSION:
keyLength = 40;
break;
case CAPI.CRYPT_RC2_56BIT_VERSION:
keyLength = 56;
break;
case CAPI.CRYPT_RC2_128BIT_VERSION:
keyLength = 128;
break;
}
// Retrieve IV if available.
if (rc2Parameters.fIV)
{
parameters = (byte[])rc2Parameters.rgbIV.Clone();
}
}
}
else if (algId == CAPI.CALG_RC4 || algId == CAPI.CALG_DES || algId == CAPI.CALG_3DES)
{
// Retrieve the IV if available. For non RC2, the parameter contains the IV
// (for RC4 the IV is really the salt). There are (128 - KeyLength) / 8
// bytes of RC4 salt.
if (algorithmIdentifier.Parameters.cbData > 0)
{
if (!CAPI.DecodeObject(new IntPtr(CAPI.X509_OCTET_STRING),
algorithmIdentifier.Parameters.pbData,
algorithmIdentifier.Parameters.cbData,
out pbParameters,
out cbParameters))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
if (cbParameters > Marshal.SizeOf(typeof(CAPI.CRYPTOAPI_BLOB)))
{
CAPI.CRYPTOAPI_BLOB blob = (CAPI.CRYPTOAPI_BLOB)Marshal.PtrToStructure(pbParameters.DangerousGetHandle(), typeof(CAPI.CRYPTOAPI_BLOB));
if (algId == CAPI.CALG_RC4)
{
if (blob.cbData > 0)
{
parameters = new byte[blob.cbData];
Marshal.Copy(blob.pbData, parameters, 0, parameters.Length);
}
}
else
{
// This should be the same as the RC4 code, but for compatibility
// * Allocate an array as big as the CRYPTOAPI_BLOB
// * Copy in the cbData value
// * Copy in the (pbData) value
//
// But don't copy in the pbData pointer value (or, rather, clear it out),
// among other things it makes decoding the same contents into two
// different EnvelopedCms objects say the parameters were different.
parameters = new byte[cbParameters];
Marshal.Copy(pbParameters.DangerousGetHandle(), parameters, 0, parameters.Length);
Array.Clear(parameters, sizeof(uint), (int)(parameters.Length - blob.cbData - sizeof(uint)));
}
}
}
// Determine key length.
if (algId == CAPI.CALG_RC4)
{
// For RC4, keyLength = 128 - (salt length * 8).
keyLength = 128 - ((int)parameters.Length * 8);
}
else if (algId == CAPI.CALG_DES)
{
// DES key length is fixed at 64 (or 56 without the parity bits).
keyLength = 64;
}
else
{
// 3DES key length is fixed at 192 (or 168 without the parity bits).
keyLength = 192;
}
}
else
{
// Everything else, don't decode it as CAPI may not expose or know how.
if (algorithmIdentifier.Parameters.cbData > 0)
{
parameters = new byte[algorithmIdentifier.Parameters.cbData];
Marshal.Copy(algorithmIdentifier.Parameters.pbData, parameters, 0, parameters.Length);
}
}
Reset(Oid.FromOidValue(algorithmIdentifier.pszObjId, OidGroup.All), keyLength, parameters);
pbParameters.Dispose();
}
internal AlgorithmIdentifier(CAPI.CRYPT_ALGORITHM_IDENTIFIER algorithmIdentifier)
{
int keyLength = 0;
uint cbParameters = 0;
SafeLocalAllocHandle pbParameters = SafeLocalAllocHandle.InvalidHandle;
byte[] parameters = new byte[0];
uint algId = X509Utils.OidToAlgId(algorithmIdentifier.pszObjId);
if (algId == CAPI.CALG_RC2)
{
if (algorithmIdentifier.Parameters.cbData > 0)
{
if (!CAPI.DecodeObject(new IntPtr(CAPI.PKCS_RC2_CBC_PARAMETERS),
algorithmIdentifier.Parameters.pbData,
algorithmIdentifier.Parameters.cbData,
out pbParameters,
out cbParameters))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
CAPI.CRYPT_RC2_CBC_PARAMETERS rc2Parameters = (CAPI.CRYPT_RC2_CBC_PARAMETERS)Marshal.PtrToStructure(pbParameters.DangerousGetHandle(), typeof(CAPI.CRYPT_RC2_CBC_PARAMETERS));
switch (rc2Parameters.dwVersion)
{
case CAPI.CRYPT_RC2_40BIT_VERSION:
keyLength = 40;
break;
case CAPI.CRYPT_RC2_56BIT_VERSION:
keyLength = 56;
break;
case CAPI.CRYPT_RC2_128BIT_VERSION:
keyLength = 128;
break;
}
// Retrieve IV if available.
if (rc2Parameters.fIV)
{
parameters = (byte[])rc2Parameters.rgbIV.Clone();
}
}
}
else if (algId == CAPI.CALG_RC4 || algId == CAPI.CALG_DES || algId == CAPI.CALG_3DES)
{
// Retrieve the IV if available. For non RC2, the parameter contains the IV
// (for RC4 the IV is really the salt). There are (128 - KeyLength) / 8
// bytes of RC4 salt.
if (algorithmIdentifier.Parameters.cbData > 0)
{
if (!CAPI.DecodeObject(new IntPtr(CAPI.X509_OCTET_STRING),
algorithmIdentifier.Parameters.pbData,
algorithmIdentifier.Parameters.cbData,
out pbParameters,
out cbParameters))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
if (cbParameters > 0)
{
if (algId == CAPI.CALG_RC4)
{
CAPI.CRYPTOAPI_BLOB saltBlob = (CAPI.CRYPTOAPI_BLOB)Marshal.PtrToStructure(pbParameters.DangerousGetHandle(), typeof(CAPI.CRYPTOAPI_BLOB));
if (saltBlob.cbData > 0)
{
parameters = new byte[saltBlob.cbData];
Marshal.Copy(saltBlob.pbData, parameters, 0, parameters.Length);
}
}
else
{
parameters = new byte[cbParameters];
Marshal.Copy(pbParameters.DangerousGetHandle(), parameters, 0, parameters.Length);
}
}
}
// Determine key length.
if (algId == CAPI.CALG_RC4)
{
// For RC4, keyLength = 128 - (salt length * 8).
keyLength = 128 - ((int)parameters.Length * 8);
}
else if (algId == CAPI.CALG_DES)
{
// DES key length is fixed at 64 (or 56 without the parity bits).
keyLength = 64;
}
else
{
// 3DES key length is fixed at 192 (or 168 without the parity bits).
keyLength = 192;
}
}
else
{
// Everything else, don't decode it as CAPI may not expose or know how.
if (algorithmIdentifier.Parameters.cbData > 0)
{
parameters = new byte[algorithmIdentifier.Parameters.cbData];
Marshal.Copy(algorithmIdentifier.Parameters.pbData, parameters, 0, parameters.Length);
}
}
Reset(Oid.FromOidValue(algorithmIdentifier.pszObjId, OidGroup.All), keyLength, parameters);
pbParameters.Dispose();
}