331 lines
8.9 KiB
C#
331 lines
8.9 KiB
C#
using System;
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using System.Collections;
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using System.Diagnostics;
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using System.IO;
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using System.Reflection;
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using System.Text;
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using Org.BouncyCastle.Utilities;
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using Org.BouncyCastle.Utilities.IO;
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namespace Org.BouncyCastle.Bcpg
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{
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/**
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* Basic output stream.
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*/
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public class ArmoredOutputStream
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: BaseOutputStream
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{
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private static readonly byte[] encodingTable =
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{
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(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
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(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
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(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
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(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
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(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
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(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
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(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
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(byte)'v',
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(byte)'w', (byte)'x', (byte)'y', (byte)'z',
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(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6',
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(byte)'7', (byte)'8', (byte)'9',
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(byte)'+', (byte)'/'
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};
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/**
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* encode the input data producing a base 64 encoded byte array.
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*/
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private static void Encode(
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Stream outStream,
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int[] data,
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int len)
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{
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Debug.Assert(len > 0);
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Debug.Assert(len < 4);
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byte[] bs = new byte[4];
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int d1 = data[0];
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bs[0] = encodingTable[(d1 >> 2) & 0x3f];
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switch (len)
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{
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case 1:
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{
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bs[1] = encodingTable[(d1 << 4) & 0x3f];
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bs[2] = (byte)'=';
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bs[3] = (byte)'=';
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break;
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}
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case 2:
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{
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int d2 = data[1];
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bs[1] = encodingTable[((d1 << 4) | (d2 >> 4)) & 0x3f];
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bs[2] = encodingTable[(d2 << 2) & 0x3f];
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bs[3] = (byte)'=';
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break;
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}
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case 3:
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{
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int d2 = data[1];
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int d3 = data[2];
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bs[1] = encodingTable[((d1 << 4) | (d2 >> 4)) & 0x3f];
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bs[2] = encodingTable[((d2 << 2) | (d3 >> 6)) & 0x3f];
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bs[3] = encodingTable[d3 & 0x3f];
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break;
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}
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}
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outStream.Write(bs, 0, bs.Length);
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}
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private readonly Stream outStream;
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private int[] buf = new int[3];
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private int bufPtr = 0;
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private Crc24 crc = new Crc24();
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private int chunkCount = 0;
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private int lastb;
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private bool start = true;
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private bool clearText = false;
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private bool newLine = false;
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private string type;
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private static readonly string nl = Platform.NewLine;
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private static readonly string headerStart = "-----BEGIN PGP ";
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private static readonly string headerTail = "-----";
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private static readonly string footerStart = "-----END PGP ";
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private static readonly string footerTail = "-----";
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private static readonly string version = "BCPG C# v"
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+ Assembly.GetExecutingAssembly().GetName().Version;
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private readonly IDictionary headers;
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public ArmoredOutputStream(Stream outStream)
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{
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this.outStream = outStream;
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this.headers = new Hashtable();
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this.headers["Version"] = version;
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}
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public ArmoredOutputStream(Stream outStream, IDictionary headers)
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{
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this.outStream = outStream;
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this.headers = new Hashtable(headers);
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this.headers["Version"] = version;
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}
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/**
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* Set an additional header entry.
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*
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* @param name the name of the header entry.
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* @param v the value of the header entry.
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*/
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public void SetHeader(
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string name,
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string v)
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{
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headers[name] = v;
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}
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/**
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* Reset the headers to only contain a Version string.
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*/
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public void ResetHeaders()
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{
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headers.Clear();
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headers["Version"] = version;
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}
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/**
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* Start a clear text signed message.
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* @param hashAlgorithm
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*/
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public void BeginClearText(
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HashAlgorithmTag hashAlgorithm)
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{
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string hash;
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switch (hashAlgorithm)
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{
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case HashAlgorithmTag.Sha1:
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hash = "SHA1";
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break;
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case HashAlgorithmTag.Sha256:
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hash = "SHA256";
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break;
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case HashAlgorithmTag.Sha384:
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hash = "SHA384";
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break;
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case HashAlgorithmTag.Sha512:
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hash = "SHA512";
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break;
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case HashAlgorithmTag.MD2:
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hash = "MD2";
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break;
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case HashAlgorithmTag.MD5:
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hash = "MD5";
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break;
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case HashAlgorithmTag.RipeMD160:
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hash = "RIPEMD160";
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break;
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default:
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throw new IOException("unknown hash algorithm tag in beginClearText: " + hashAlgorithm);
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}
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DoWrite("-----BEGIN PGP SIGNED MESSAGE-----" + nl);
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DoWrite("Hash: " + hash + nl + nl);
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clearText = true;
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newLine = true;
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lastb = 0;
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}
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public void EndClearText()
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{
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clearText = false;
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}
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public override void WriteByte(
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byte b)
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{
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if (clearText)
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{
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outStream.WriteByte(b);
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if (newLine)
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{
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if (!(b == '\n' && lastb == '\r'))
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{
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newLine = false;
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}
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if (b == '-')
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{
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outStream.WriteByte((byte)' ');
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outStream.WriteByte((byte)'-'); // dash escape
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}
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}
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if (b == '\r' || (b == '\n' && lastb != '\r'))
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{
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newLine = true;
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}
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lastb = b;
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return;
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}
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if (start)
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{
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bool newPacket = (b & 0x40) != 0;
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int tag;
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if (newPacket)
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{
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tag = b & 0x3f;
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}
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else
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{
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tag = (b & 0x3f) >> 2;
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}
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switch ((PacketTag)tag)
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{
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case PacketTag.PublicKey:
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type = "PUBLIC KEY BLOCK";
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break;
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case PacketTag.SecretKey:
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type = "PRIVATE KEY BLOCK";
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break;
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case PacketTag.Signature:
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type = "SIGNATURE";
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break;
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default:
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type = "MESSAGE";
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break;
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}
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DoWrite(headerStart + type + headerTail + nl);
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WriteHeaderEntry("Version", (string) headers["Version"]);
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foreach (DictionaryEntry de in headers)
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{
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string k = (string) de.Key;
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if (k != "Version")
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{
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string v = (string) de.Value;
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WriteHeaderEntry(k, v);
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}
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}
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DoWrite(nl);
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start = false;
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}
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if (bufPtr == 3)
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{
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Encode(outStream, buf, bufPtr);
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bufPtr = 0;
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if ((++chunkCount & 0xf) == 0)
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{
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DoWrite(nl);
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}
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}
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crc.Update(b);
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buf[bufPtr++] = b & 0xff;
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}
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/**
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* <b>Note</b>: close does nor close the underlying stream. So it is possible to write
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* multiple objects using armoring to a single stream.
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*/
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public override void Close()
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{
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if (type != null)
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{
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if (bufPtr > 0)
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{
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Encode(outStream, buf, bufPtr);
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}
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DoWrite(nl + '=');
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int crcV = crc.Value;
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buf[0] = ((crcV >> 16) & 0xff);
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buf[1] = ((crcV >> 8) & 0xff);
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buf[2] = (crcV & 0xff);
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Encode(outStream, buf, 3);
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DoWrite(nl);
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DoWrite(footerStart);
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DoWrite(type);
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DoWrite(footerTail);
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DoWrite(nl);
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outStream.Flush();
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type = null;
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start = true;
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base.Close();
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}
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}
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private void WriteHeaderEntry(
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string name,
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string v)
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{
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DoWrite(name + ": " + v + nl);
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}
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private void DoWrite(
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string s)
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{
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byte[] bs = Encoding.ASCII.GetBytes(s);
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outStream.Write(bs, 0, bs.Length);
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}
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}
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}
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