package org.bouncycastle.jce.provider;
import java.io.IOException;
import java.io.InputStream;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.util.encoders.Base64;
public class PEMUtil
{
private final String _header1;
private final String _header2;
private final String _footer1;
private final String _footer2;
PEMUtil(
String type)
{
_header1 = "-----BEGIN " + type + "-----";
_header2 = "-----BEGIN X509 " + type + "-----";
_footer1 = "-----END " + type + "-----";
_footer2 = "-----END X509 " + type + "-----";
}
private String readLine(
InputStream in)
throws IOException
{
int c;
StringBuffer l = new StringBuffer();
do
{
while (((c = in.read()) != '\r') && c != '\n' && (c >= 0))
{
if (c == '\r')
{
continue;
}
l.append((char)c);
}
}
while (c >= 0 && l.length() == 0);
if (c < 0)
{
return null;
}
return l.toString();
}
ASN1Sequence readPEMObject(
InputStream in)
throws IOException
{
String line;
StringBuffer pemBuf = new StringBuffer();
while ((line = readLine(in)) != null)
{
if (line.startsWith(_header1) || line.startsWith(_header2))
{
break;
}
}
while ((line = readLine(in)) != null)
{
if (line.startsWith(_footer1) || line.startsWith(_footer2))
{
break;
}
pemBuf.append(line);
}
if (pemBuf.length() != 0)
{
ASN1Primitive o = new ASN1InputStream(Base64.decode(pemBuf.toString())).readObject();
if (!(o instanceof ASN1Sequence))
{
throw new IOException("malformed PEM data encountered");
}
return (ASN1Sequence)o;
}
return null;
}
}