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package org.bouncycastle.openpgp;

import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.bcpg.S2K;
import org.bouncycastle.util.io.Streams;

/**
 * Utility functions for looking a S-expression keys. This class will move when it finds a better home!
 * 

* Format documented here: * http://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=agent/keyformat.txt;h=42c4b1f06faf1bbe71ffadc2fee0fad6bec91a97;hb=refs/heads/master *

*/ class SXprUtils { private static int readLength(InputStream in, int ch) throws IOException { int len = ch - '0'; while ((ch = in.read()) >= 0 && ch != ':') { len = len * 10 + ch - '0'; } return len; } static String readString(InputStream in, int ch) throws IOException { int len = readLength(in, ch); char[] chars = new char[len]; for (int i = 0; i != chars.length; i++) { chars[i] = (char)in.read(); } return new String(chars); } static byte[] readBytes(InputStream in, int ch) throws IOException { int len = readLength(in, ch); byte[] data = new byte[len]; Streams.readFully(in, data); return data; } static S2K parseS2K(InputStream in) throws IOException { skipOpenParenthesis(in); String alg = readString(in, in.read()); byte[] iv = readBytes(in, in.read()); final long iterationCount = Long.parseLong(readString(in, in.read())); skipCloseParenthesis(in); // we have to return the actual iteration count provided. S2K s2k = new S2K(HashAlgorithmTags.SHA1, iv, (int)iterationCount) { public long getIterationCount() { return iterationCount; } }; return s2k; } static void skipOpenParenthesis(InputStream in) throws IOException { int ch = in.read(); if (ch != '(') { throw new IOException("unknown character encountered"); } } static void skipCloseParenthesis(InputStream in) throws IOException { int ch = in.read(); if (ch != ')') { throw new IOException("unknown character encountered"); } } }




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