public static byte[] HexToBinary(string hex)
{
const string IGNORED_CHARS = ":- ";
var arr = new byte[hex.Length >> 1];
var bin = Marshal.AllocHGlobal(arr.Length);
int binLength;
//we call sodium_hex2bin with some chars to be ignored
var ret = NativeLibsodium.sodium_hex2bin(bin, arr.Length, hex, hex.Length, IGNORED_CHARS, out binLength, null);
Marshal.Copy(bin, arr, 0, binLength);
Marshal.FreeHGlobal(bin);
if (ret != 0)
{
throw new Exception("Internal error, decoding failed.");
}
//remove the trailing nulls from the array, if there were some format characters in the hex string before
if (arr.Length != binLength)
{
var tmp = new byte[binLength];
Array.Copy(arr, 0, tmp, 0, binLength);
return(tmp);
}
return(arr);
}
unsafe public static byte[] HexToBinary(string hex)
{
const string IGNORED_CHARS = ":- ";
byte[] arr = new byte[hex.Length >> 1];
byte[] hexBytes = Encoding.ASCII.GetBytes(hex);
int binLength;
fixed(byte *arrPtr = arr)
{
//we call sodium_hex2bin with some chars to be ignored
int ret = NativeLibsodium.sodium_hex2bin(
arrPtr, arr.Length,
hex, hexBytes.Length,
IGNORED_CHARS,
out binLength,
null
);
if (ret != 0)
{
throw new Exception("Internal error, decoding failed.");
}
}
//remove the trailing nulls from the array, if there were some format characters in the hex string before
if (arr.Length != binLength)
{
byte[] tmp = new byte[binLength];
Array.Copy(arr, 0, tmp, 0, binLength);
return(tmp);
}
return(arr);
}
