diff --git a/crypto/src/util/BigIntegers.cs b/crypto/src/util/BigIntegers.cs
index a61824394..1d706beb4 100644
--- a/crypto/src/util/BigIntegers.cs
+++ b/crypto/src/util/BigIntegers.cs
@@ -66,6 +66,9 @@ namespace Org.BouncyCastle.Utilities
*/
public static void AsUnsignedByteArray(BigInteger value, byte[] buf, int off, int len)
{
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ AsUnsignedByteArray(value, buf.AsSpan(off, len));
+#else
byte[] bytes = value.ToByteArrayUnsigned();
if (bytes.Length == len)
{
@@ -82,8 +85,32 @@ namespace Org.BouncyCastle.Utilities
int padLen = len - count;
Arrays.Fill(buf, off, off + padLen, 0);
Array.Copy(bytes, start, buf, off + padLen, count);
+#endif
}
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ public static void AsUnsignedByteArray(BigInteger value, Span<byte> buf)
+ {
+ int len = buf.Length;
+ byte[] bytes = value.ToByteArrayUnsigned();
+ if (bytes.Length == len)
+ {
+ bytes.CopyTo(buf);
+ return;
+ }
+
+ int start = bytes[0] == 0 ? 1 : 0;
+ int count = bytes.Length - start;
+
+ if (count > len)
+ throw new ArgumentException("standard length exceeded for value");
+
+ int padLen = len - count;
+ buf[..padLen].Fill(0x00);
+ bytes.AsSpan(start, count).CopyTo(buf[padLen..]);
+ }
+#endif
+
/// <summary>
/// Creates a Random BigInteger from the secure random of a given bit length.
/// </summary>
|
