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package org.bouncycastle.jcajce.provider.asymmetric.x509;
import java.io.IOException;
import java.io.InputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.util.encoders.Base64;
class PEMUtil
{
/**
* Boundary class. Keeps track of the required header/footer pair for the
* current PEM object.
*
*/
private class Boundaries
{
private final String _header;
private final String _footer;
private Boundaries(String type)
{
this._header = "-----BEGIN " + type + "-----";
this._footer = "-----END " + type + "-----";
}
public boolean isTheExpectedHeader(String line)
{
return line.startsWith(_header);
}
public boolean isTheExpectedFooter(String line)
{
return line.startsWith(_footer);
}
}
private final Boundaries[] _supportedBoundaries;
PEMUtil(String type)
{
_supportedBoundaries = new Boundaries[]
{ new Boundaries(type), new Boundaries("X509 " + type),
new Boundaries("PKCS7") };
}
private String readLine(InputStream in) throws IOException
{
int c;
StringBuffer l = new StringBuffer();
do
{
while (((c = in.read()) != '\r') && c != '\n' && (c >= 0))
{
l.append((char) c);
}
}
while (c >= 0 && l.length() == 0);
if (c < 0)
{
// make sure to return the read bytes if the end of file is encountered
if (l.length() == 0)
{
return null;
}
return l.toString();
}
// make sure we parse to end of line.
if (c == '\r')
{
// a '\n' may follow
in.mark(1);
if (((c = in.read()) == '\n'))
{
in.mark(1);
}
if (c > 0)
{
in.reset();
}
}
return l.toString();
}
/**
* Returns a {@link Boundaries} object representing the passed in boundary
* string.
*
* @param line the boundary string
* @return the {@link Boundaries} object corresponding to the given boundary
* string or <code>null</code> if the passed in string is not a valid
* boundary.
*/
private Boundaries getBoundaries(String line)
{
for (int i = 0; i != _supportedBoundaries.length; i++)
{
Boundaries boundary = _supportedBoundaries[i];
if (boundary.isTheExpectedHeader(line) || boundary.isTheExpectedFooter(line))
{
return boundary;
}
}
return null;
}
ASN1Sequence readPEMObject(
InputStream in)
throws IOException
{
String line;
StringBuffer pemBuf = new StringBuffer();
Boundaries header = null;
while (header == null && (line = readLine(in)) != null)
{
header = getBoundaries(line);
if (header != null && !header.isTheExpectedHeader(line))
{
throw new IOException("malformed PEM data: found footer where header was expected");
}
}
if (header == null)
{
throw new IOException("malformed PEM data: no header found");
}
Boundaries footer = null;
while (footer == null && (line = readLine(in)) != null)
{
footer = getBoundaries(line);
if (footer != null)
{
if (!header.isTheExpectedFooter(line))
{
throw new IOException("malformed PEM data: header/footer mismatch");
}
}
else
{
pemBuf.append(line);
}
}
if (footer == null)
{
throw new IOException("malformed PEM data: no footer found");
}
if (pemBuf.length() != 0)
{
try
{
return ASN1Sequence.getInstance(Base64.decode(pemBuf.toString()));
}
catch (Exception e)
{
throw new IOException("malformed PEM data encountered");
}
}
return null;
}
}
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