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-rw-r--r--crypto/src/asn1/DerBitString.cs13
1 files changed, 7 insertions, 6 deletions
diff --git a/crypto/src/asn1/DerBitString.cs b/crypto/src/asn1/DerBitString.cs
index caf5d6f9f..591d4403c 100644
--- a/crypto/src/asn1/DerBitString.cs
+++ b/crypto/src/asn1/DerBitString.cs
@@ -278,15 +278,16 @@ namespace Org.BouncyCastle.Asn1
 
         public override string GetString()
 		{
-			StringBuilder buffer = new StringBuilder("#");
-
 			byte[] str = GetDerEncoded();
 
-			for (int i = 0; i != str.Length; i++)
+            StringBuilder buffer = new StringBuilder(1 + str.Length * 2);
+            buffer.Append('#');
+
+            for (int i = 0; i != str.Length; i++)
 			{
-				uint ubyte = str[i];
-				buffer.Append(table[(ubyte >> 4) & 0xf]);
-				buffer.Append(table[str[i] & 0xf]);
+				uint u8 = str[i];
+				buffer.Append(table[u8 >> 4]);
+				buffer.Append(table[u8 & 0xF]);
 			}
 
 			return buffer.ToString();