/// <summary>Converts Base64 encoded string to byte array.</summary>
/// <param name="base64">Base64 encoded string.</param>
/// <param name="ignoredChars">Characters which will be ignored in decoding.</param>
/// <param name="variant">Base64 encoding variant</param>
/// <exception cref="Exception"></exception>
/// <returns>A byte array of decoded Base64 string</returns>
public static byte[] Base64ToBinary(string base64, string ignoredChars, Base64Variant variant = Base64Variant.Original)
{
if (base64 == null)
{
throw new ArgumentNullException(nameof(base64), "Data is null, encoding failed");
}
if (base64 == string.Empty)
{
return(new byte[] { });
}
var bin = Marshal.AllocHGlobal(base64.Length);
var ret = SodiumLibrary.sodium_base642bin(bin, base64.Length, base64, base64.Length, ignoredChars, out var binLength,
out var lastChar, (int)variant);
if (ret != 0)
{
throw new Exception("Internal error, decoding failed.");
}
var decodedArr = new byte[binLength];
Marshal.Copy(bin, decodedArr, 0, binLength);
Marshal.FreeHGlobal(bin);
return(decodedArr);
}
/// <summary>Takes byte array and converts it to Base64 encoded string.</summary>
/// <param name="data">Data to be encoded.</param>
/// <param name="variant">Base64 encoding variant.</param>
/// <exception cref="OverflowException"></exception>
/// <returns>Base64 encoded string.</returns>
public static string BinaryToBase64(byte[] data, Base64Variant variant = Base64Variant.Original)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data), "Data is null, encoding failed");
}
if (data.Length == 0)
{
return(string.Empty);
}
int base64MaxLen = SodiumLibrary.sodium_base64_encoded_len(data.Length, (int)variant);
var b64 = new byte[base64MaxLen - 1];
var base64 = SodiumLibrary.sodium_bin2base64(b64, base64MaxLen, data, data.Length, (int)variant);
if (base64 == IntPtr.Zero)
{
throw new OverflowException("Internal error, encoding failed.");
}
return(Marshal.PtrToStringAnsi(base64));
}
