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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!
* <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);
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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