blob: 220aa285ffd2e313c0976341f209461290d3aa56 [file] [log] [blame]
/*
* Copyright (c) 2000-2021 The Legion of the Bouncy Castle Inc. (https://www.bouncycastle.org)
* <p>
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
*including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
* </p>
* <p>
* The above copyright notice and this permission notice shall be included in all copies or substantial
* portions of the Software.
* </p>
* <p>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
* </p>
*/
package org.eclipse.jgit.gpg.bc.internal.keys;
// This class is an unmodified copy from Bouncy Castle; needed because it's package-visible only and used by SExprParser.
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!
* <p>
* 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
* </p>
*/
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);
// Algorithm is hard-coded to SHA1 below anyway.
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) {
@Override
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: " + (char) ch); //$NON-NLS-1$
}
}
static void skipCloseParenthesis(InputStream in) throws IOException {
int ch = in.read();
if (ch != ')') {
throw new IOException("unknown character encountered"); //$NON-NLS-1$
}
}
}