private unsafe static int GetIntProperty(SafeBCryptHandle provider, string property)
{
int length;
int objectSize;
ExceptionHelper.CheckReturnCode(BCryptGetProperty(provider, property, &objectSize, 4, out length, 0));
return(objectSize);
}
internal unsafe static BCRYPT_AUTH_TAG_LENGTHS_STRUCT GetAuthTagLengths(SafeBCryptHandle provider)
{
var size = sizeof(BCRYPT_AUTH_TAG_LENGTHS_STRUCT);
var output = default(BCRYPT_AUTH_TAG_LENGTHS_STRUCT);
int result;
BCryptGetProperty(provider, BCryptPropertyStrings.BCRYPT_AUTH_TAG_LENGTH, &output, size, out result, 0);
return(output);
}
private unsafe static string GetStringProperty(SafeBCryptHandle provider, string property)
{
int objectSize;
ExceptionHelper.CheckReturnCode(BCryptGetProperty(provider, property, null, 0, out objectSize, 0));
var buffer = stackalloc byte[objectSize];
ExceptionHelper.CheckReturnCode(BCryptGetProperty(provider, property, buffer, objectSize, out objectSize, 0));
return(Marshal.PtrToStringUni((IntPtr)buffer));
}
private unsafe static string[] GetStringArrayProperty(SafeBCryptHandle provider, string property)
{
int bufferSize;
ExceptionHelper.CheckReturnCode(BCryptGetProperty(provider, property, null, 0, out bufferSize, 0));
var tempBuffer = stackalloc byte[bufferSize];
ExceptionHelper.CheckReturnCode(BCryptGetProperty(provider, property, tempBuffer, bufferSize, out bufferSize, 0));
var header = Marshal.PtrToStructure <BCRYPT_ECC_CURVE_NAMES>((IntPtr)tempBuffer);
var returnValues = new string[header.dwEccCurveNames];
for (var i = 0; i < header.dwEccCurveNames; i++)
{
var currentPtr = Unsafe.Read <IntPtr>((void *)IntPtr.Add(header.pEccCurveNames, i * IntPtr.Size));
returnValues[i] = Marshal.PtrToStringUni(currentPtr);
}
return(returnValues);
}
internal static unsafe partial NTSTATUS BCryptGetProperty(SafeBCryptHandle hObject, string pszProperty, void *pbOutput, int cbOutput, out int pcbResult, int dwFlags);
internal static extern unsafe int BCryptGetProperty(SafeBCryptHandle handleObject, string propertyString, void *outputBuffer, int outputByteLength, out int resultSize, int flags);
internal static string[] GetECCurveNameList(SafeBCryptHandle provider)
{
return(GetStringArrayProperty(provider, BCryptPropertyStrings.BCRYPT_ECC_CURVE_NAME_LIST));
}
private static void SetStringProperty(SafeBCryptHandle provider, string property, string value)
{
ExceptionHelper.CheckReturnCode(
BCryptSetProperty(provider, property, value, value != null ? (value.Length + 1) * sizeof(char) : 0, 0));
}
internal static void SetEccCurveName(SafeBCryptHandle key, string curveName)
{
SetStringProperty(key, BCryptPropertyStrings.BCRYPT_ECC_CURVE_NAME, curveName);
}
internal static int GetKeySizeInBits(SafeBCryptHandle provider)
{
return(GetIntProperty(provider, BCryptPropertyStrings.BCRYPT_KEY_LENGTH));
}
internal static int GetHashLength(SafeBCryptHandle provider)
{
return(GetIntProperty(provider, BCryptPropertyStrings.BCRYPT_HASH_LENGTH));
}
internal static int GetBlockLength(SafeBCryptHandle provider)
{
return(GetIntProperty(provider, BCryptPropertyStrings.BCRYPT_BLOCK_LENGTH));
}
internal static int GetMaxAuthTagLength(SafeBCryptHandle provider)
{
return(GetAuthTagLengths(provider).dwMaxLength);
}
internal static void SetBlockChainingMode(SafeBCryptHandle provider, string chainingMode)
{
SetStringProperty(provider, BCryptPropertyStrings.BCRYPT_CHAINING_MODE, chainingMode);
}
internal static string GetBlockChainingMode(SafeBCryptHandle provider)
{
return(GetStringProperty(provider, BCryptPropertyStrings.BCRYPT_CHAINING_MODE));
}
internal static extern unsafe NTSTATUS BCryptSetProperty(SafeBCryptHandle hObject, string pszProperty, string pbInput, int cbInput, int dwFlags);
