System.Security.Cryptography.AsymmetricAlgorithmHelpers static class AsymmetricAlgorithmHelpers Documentation Code public static byte[] ConvertDerToIeee1363(ReadOnlySpan<byte> input, int fieldSizeBits) Convert Der format of (r, s) to Ieee1363 format public static byte[] ConvertIeee1363ToDer(ReadOnlySpan<byte> input) Convert Ieee1363 format of (r, s) to Der format