Initial import of old CVS repository

1 files changed, 307 insertions, 0 deletions

diff --git a/crypto/src/util/encoders/Base64Encoder.cs b/crypto/src/util/encoders/Base64Encoder.cs
new file mode 100644
index 000000000..c94ce9d3c
--- /dev/null
+++ b/crypto/src/util/encoders/Base64Encoder.cs
@@ -0,0 +1,307 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.Encoders
+{
+	public class Base64Encoder
+		: IEncoder
+	{
+		protected readonly byte[] encodingTable =
+		{
+			(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
+			(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
+			(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
+			(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
+			(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
+			(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
+			(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
+			(byte)'v',
+			(byte)'w', (byte)'x', (byte)'y', (byte)'z',
+			(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6',
+			(byte)'7', (byte)'8', (byte)'9',
+			(byte)'+', (byte)'/'
+		};
+
+		protected byte padding = (byte)'=';
+
+		/*
+		* set up the decoding table.
+		*/
+		protected readonly byte[] decodingTable = new byte[128];
+
+		protected void InitialiseDecodingTable()
+		{
+			for (int i = 0; i < encodingTable.Length; i++)
+			{
+				decodingTable[encodingTable[i]] = (byte)i;
+			}
+		}
+
+		public Base64Encoder()
+		{
+			InitialiseDecodingTable();
+		}
+
+		/**
+		* encode the input data producing a base 64 output stream.
+		*
+		* @return the number of bytes produced.
+		*/
+		public int Encode(
+			byte[]	data,
+			int		off,
+			int		length,
+			Stream	outStream)
+		{
+			int modulus = length % 3;
+			int dataLength = (length - modulus);
+			int a1, a2, a3;
+
+			for (int i = off; i < off + dataLength; i += 3)
+			{
+				a1 = data[i] & 0xff;
+				a2 = data[i + 1] & 0xff;
+				a3 = data[i + 2] & 0xff;
+
+				outStream.WriteByte(encodingTable[(int) ((uint) a1 >> 2) & 0x3f]);
+				outStream.WriteByte(encodingTable[((a1 << 4) | (int) ((uint) a2 >> 4)) & 0x3f]);
+				outStream.WriteByte(encodingTable[((a2 << 2) | (int) ((uint) a3 >> 6)) & 0x3f]);
+				outStream.WriteByte(encodingTable[a3 & 0x3f]);
+			}
+
+			/*
+			* process the tail end.
+			*/
+			int b1, b2, b3;
+			int d1, d2;
+
+			switch (modulus)
+			{
+				case 0:        /* nothing left to do */
+					break;
+				case 1:
+					d1 = data[off + dataLength] & 0xff;
+					b1 = (d1 >> 2) & 0x3f;
+					b2 = (d1 << 4) & 0x3f;
+
+					outStream.WriteByte(encodingTable[b1]);
+					outStream.WriteByte(encodingTable[b2]);
+					outStream.WriteByte(padding);
+					outStream.WriteByte(padding);
+					break;
+				case 2:
+					d1 = data[off + dataLength] & 0xff;
+					d2 = data[off + dataLength + 1] & 0xff;
+
+					b1 = (d1 >> 2) & 0x3f;
+					b2 = ((d1 << 4) | (d2 >> 4)) & 0x3f;
+					b3 = (d2 << 2) & 0x3f;
+
+					outStream.WriteByte(encodingTable[b1]);
+					outStream.WriteByte(encodingTable[b2]);
+					outStream.WriteByte(encodingTable[b3]);
+					outStream.WriteByte(padding);
+					break;
+			}
+
+			return (dataLength / 3) * 4 + ((modulus == 0) ? 0 : 4);
+		}
+
+		private bool ignore(
+			char c)
+		{
+			return (c == '\n' || c =='\r' || c == '\t' || c == ' ');
+		}
+
+		/**
+		* decode the base 64 encoded byte data writing it to the given output stream,
+		* whitespace characters will be ignored.
+		*
+		* @return the number of bytes produced.
+		*/
+		public int Decode(
+			byte[]	data,
+			int		off,
+			int		length,
+			Stream	outStream)
+		{
+			byte b1, b2, b3, b4;
+			int outLen = 0;
+
+			int end = off + length;
+
+			while (end > off)
+			{
+				if (!ignore((char)data[end - 1]))
+				{
+					break;
+				}
+
+				end--;
+			}
+
+			int  i = off;
+			int  finish = end - 4;
+
+			i = nextI(data, i, finish);
+
+			while (i < finish)
+			{
+				b1 = decodingTable[data[i++]];
+
+				i = nextI(data, i, finish);
+
+				b2 = decodingTable[data[i++]];
+
+				i = nextI(data, i, finish);
+
+				b3 = decodingTable[data[i++]];
+
+				i = nextI(data, i, finish);
+
+				b4 = decodingTable[data[i++]];
+
+				outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4)));
+				outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2)));
+				outStream.WriteByte((byte)((b3 << 6) | b4));
+
+				outLen += 3;
+
+				i = nextI(data, i, finish);
+			}
+
+			outLen += decodeLastBlock(outStream, (char)data[end - 4], (char)data[end - 3], (char)data[end - 2], (char)data[end - 1]);
+
+			return outLen;
+		}
+
+		private int nextI(
+			byte[]	data,
+			int		i,
+			int		finish)
+		{
+			while ((i < finish) && ignore((char)data[i]))
+			{
+				i++;
+			}
+			return i;
+		}
+
+		/**
+		* decode the base 64 encoded string data writing it to the given output stream,
+		* whitespace characters will be ignored.
+		*
+		* @return the number of bytes produced.
+		*/
+		public int DecodeString(
+			string	data,
+			Stream	outStream)
+		{
+			// Platform Implementation
+//			byte[] bytes = Convert.FromBase64String(data);
+//			outStream.Write(bytes, 0, bytes.Length);
+//			return bytes.Length;
+
+			byte b1, b2, b3, b4;
+			int length = 0;
+
+			int end = data.Length;
+
+			while (end > 0)
+			{
+				if (!ignore(data[end - 1]))
+				{
+					break;
+				}
+
+				end--;
+			}
+
+			int  i = 0;
+			int  finish = end - 4;
+
+			i = nextI(data, i, finish);
+
+			while (i < finish)
+			{
+				b1 = decodingTable[data[i++]];
+
+				i = nextI(data, i, finish);
+
+				b2 = decodingTable[data[i++]];
+
+				i = nextI(data, i, finish);
+
+				b3 = decodingTable[data[i++]];
+
+				i = nextI(data, i, finish);
+
+				b4 = decodingTable[data[i++]];
+
+				outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4)));
+				outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2)));
+				outStream.WriteByte((byte)((b3 << 6) | b4));
+
+				length += 3;
+
+				i = nextI(data, i, finish);
+			}
+
+			length += decodeLastBlock(outStream, data[end - 4], data[end - 3], data[end - 2], data[end - 1]);
+
+			return length;
+		}
+
+		private int decodeLastBlock(
+			Stream	outStream,
+			char	c1,
+			char	c2,
+			char	c3,
+			char	c4)
+		{
+			if (c3 == padding)
+			{
+				byte b1 = decodingTable[c1];
+				byte b2 = decodingTable[c2];
+
+				outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4)));
+
+				return 1;
+			}
+
+			if (c4 == padding)
+			{
+				byte b1 = decodingTable[c1];
+				byte b2 = decodingTable[c2];
+				byte b3 = decodingTable[c3];
+
+				outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4)));
+				outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2)));
+
+				return 2;
+			}
+
+			{
+				byte b1 = decodingTable[c1];
+				byte b2 = decodingTable[c2];
+				byte b3 = decodingTable[c3];
+				byte b4 = decodingTable[c4];
+
+				outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4)));
+				outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2)));
+				outStream.WriteByte((byte)((b3 << 6) | b4));
+
+				return 3;
+			}
+		}
+
+		private int nextI(string data, int i, int finish)
+		{
+			while ((i < finish) && ignore(data[i]))
+			{
+				i++;
+			}
+			return i;
+		}
+	}
+}