1 files changed, 148 insertions, 0 deletions
diff --git a/sshlib/src/main/java/com/trilead/ssh2/crypto/Base64.java b/sshlib/src/main/java/com/trilead/ssh2/crypto/Base64.java
new file mode 100644
index 0000000..93770ac
--- /dev/null
+++ b/sshlib/src/main/java/com/trilead/ssh2/crypto/Base64.java
@@ -0,0 +1,148 @@
+
+package com.trilead.ssh2.crypto;
+
+import java.io.CharArrayWriter;
+import java.io.IOException;
+
+/**
+ * Basic Base64 Support.
+ * 
+ * @author Christian Plattner, plattner@trilead.com
+ * @version $Id: Base64.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $
+ */
+public class Base64
+{
+	static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
+	
+	public static char[] encode(byte[] content)
+	{
+		CharArrayWriter cw = new CharArrayWriter((4 * content.length) / 3);
+
+		int idx = 0;
+					
+		int x = 0;
+
+		for (int i = 0; i < content.length; i++)
+		{
+			if (idx == 0)
+				x = (content[i] & 0xff) << 16;
+			else if (idx == 1)
+				x = x | ((content[i] & 0xff) << 8);
+			else
+				x = x | (content[i] & 0xff);
+
+			idx++;
+
+			if (idx == 3)
+			{
+				cw.write(alphabet[x >> 18]);
+				cw.write(alphabet[(x >> 12) & 0x3f]);
+				cw.write(alphabet[(x >> 6) & 0x3f]);
+				cw.write(alphabet[x & 0x3f]);
+
+				idx = 0;
+			}
+		}
+
+		if (idx == 1)
+		{
+			cw.write(alphabet[x >> 18]);
+			cw.write(alphabet[(x >> 12) & 0x3f]);
+			cw.write('=');
+			cw.write('=');
+		}
+
+		if (idx == 2)
+		{
+			cw.write(alphabet[x >> 18]);
+			cw.write(alphabet[(x >> 12) & 0x3f]);
+			cw.write(alphabet[(x >> 6) & 0x3f]);
+			cw.write('=');
+		}
+
+		return cw.toCharArray();
+	}
+
+	public static byte[] decode(char[] message) throws IOException
+	{
+		byte buff[] = new byte[4];
+		byte dest[] = new byte[message.length];
+
+		int bpos = 0;
+		int destpos = 0;
+
+		for (int i = 0; i < message.length; i++)
+		{
+			int c = message[i];
+
+			if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t'))
+				continue;
+
+			if ((c >= 'A') && (c <= 'Z'))
+			{
+				buff[bpos++] = (byte) (c - 'A');
+			}
+			else if ((c >= 'a') && (c <= 'z'))
+			{
+				buff[bpos++] = (byte) ((c - 'a') + 26);
+			}
+			else if ((c >= '0') && (c <= '9'))
+			{
+				buff[bpos++] = (byte) ((c - '0') + 52);
+			}
+			else if (c == '+')
+			{
+				buff[bpos++] = 62;
+			}
+			else if (c == '/')
+			{
+				buff[bpos++] = 63;
+			}
+			else if (c == '=')
+			{
+				buff[bpos++] = 64;
+			}
+			else
+			{
+				throw new IOException("Illegal char in base64 code.");
+			}
+
+			if (bpos == 4)
+			{
+				bpos = 0;
+
+				if (buff[0] == 64)
+					break;
+
+				if (buff[1] == 64)
+					throw new IOException("Unexpected '=' in base64 code.");
+
+				if (buff[2] == 64)
+				{
+					int v = (((buff[0] & 0x3f) << 6) | ((buff[1] & 0x3f)));
+					dest[destpos++] = (byte) (v >> 4);
+					break;
+				}
+				else if (buff[3] == 64)
+				{
+					int v = (((buff[0] & 0x3f) << 12) | ((buff[1] & 0x3f) << 6) | ((buff[2] & 0x3f)));
+					dest[destpos++] = (byte) (v >> 10);
+					dest[destpos++] = (byte) (v >> 2);
+					break;
+				}
+				else
+				{
+					int v = (((buff[0] & 0x3f) << 18) | ((buff[1] & 0x3f) << 12) | ((buff[2] & 0x3f) << 6) | ((buff[3] & 0x3f)));
+					dest[destpos++] = (byte) (v >> 16);
+					dest[destpos++] = (byte) (v >> 8);
+					dest[destpos++] = (byte) (v);
+				}
+			}
+		}
+
+		byte[] res = new byte[destpos];
+		System.arraycopy(dest, 0, res, 0, destpos);
+
+		return res;
+	}
+}