diff --git a/crypto/src/util/encoders/HexEncoder.cs b/crypto/src/util/encoders/HexEncoder.cs
index a36f31dbd..05933af05 100644
--- a/crypto/src/util/encoders/HexEncoder.cs
+++ b/crypto/src/util/encoders/HexEncoder.cs
@@ -6,6 +6,45 @@ namespace Org.BouncyCastle.Utilities.Encoders
public class HexEncoder
: IEncoder
{
+ private static readonly char[] CharsLower = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+ private static readonly char[] CharsUpper = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ internal static int EncodeLower(ReadOnlySpan<byte> input, Span<char> output)
+ {
+ int inPos = 0;
+ int inEnd = input.Length;
+ int outPos = 0;
+
+ while (inPos < inEnd)
+ {
+ uint b = input[inPos++];
+
+ output[outPos++] = CharsLower[b >> 4];
+ output[outPos++] = CharsLower[b & 0xF];
+ }
+
+ return outPos;
+ }
+
+ internal static int EncodeUpper(ReadOnlySpan<byte> input, Span<char> output)
+ {
+ int inPos = 0;
+ int inEnd = input.Length;
+ int outPos = 0;
+
+ while (inPos < inEnd)
+ {
+ uint b = input[inPos++];
+
+ output[outPos++] = CharsUpper[b >> 4];
+ output[outPos++] = CharsUpper[b & 0xF];
+ }
+
+ return outPos;
+ }
+#endif
+
protected readonly byte[] encodingTable =
{
(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7',
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