1 files changed, 80 insertions, 0 deletions
diff --git a/crypto/src/crypto/util/SshBuilder.cs b/crypto/src/crypto/util/SshBuilder.cs
new file mode 100644
index 000000000..9f2f35360
--- /dev/null
+++ b/crypto/src/crypto/util/SshBuilder.cs
@@ -0,0 +1,80 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Utilities
+{
+ internal class SshBuilder
+ {
+ private readonly MemoryStream bos = new MemoryStream();
+
+ public void U32(uint value)
+ {
+ bos.WriteByte(Convert.ToByte(value >> 24 & 0xFF));
+ bos.WriteByte(Convert.ToByte(value >> 16 & 0xFF));
+ bos.WriteByte(Convert.ToByte(value >> 8 & 0xFF));
+ bos.WriteByte(Convert.ToByte(value & 0xFF));
+ }
+
+ public void WriteBigNum(BigInteger n)
+ {
+ WriteBlock(n.ToByteArray());
+ }
+
+ public void WriteBlock(byte[] value)
+ {
+ U32((uint)value.Length);
+ try
+ {
+ bos.Write(value, 0, value.Length);
+ }
+ catch (IOException e)
+ {
+ throw new InvalidOperationException(e.Message, e);
+ }
+ }
+
+ public void WriteBytes(byte[] value)
+ {
+ try
+ {
+ bos.Write(value, 0, value.Length);
+ }
+ catch (IOException e)
+ {
+ throw new InvalidOperationException(e.Message, e);
+ }
+ }
+
+ public void WriteString(string str)
+ {
+ WriteBlock(Strings.ToByteArray(str));
+ }
+
+ public byte[] GetBytes()
+ {
+ return bos.ToArray();
+ }
+
+ public byte[] GetPaddedBytes()
+ {
+ return GetPaddedBytes(8);
+ }
+
+ public byte[] GetPaddedBytes(int blockSize)
+ {
+ int align = (int)bos.Length % blockSize;
+ if (0 != align)
+ {
+ int padCount = blockSize - align;
+ for (int i = 1; i <= padCount; ++i)
+ {
+ bos.WriteByte(Convert.ToByte(i));
+ }
+ }
+ return bos.ToArray();
+ }
+ }
+}
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