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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.x509;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetEncoder;
import netscape.security.util.ASN1CharStrConvMap;
import netscape.security.util.DerValue;
/**
* A GenericValueConverter converts a string that is not associated with
* a particular attribute to a DER encoded ASN.1 character string type.
* Currently supports PrintableString, IA5String, BMPString T.61String and
* Universal String.
*
* <p>
* The conversion is done as follows. An encoder is obtained for the all the character sets from the global default
* ASN1CharStrConvMap. The encoders are then used to convert the string to the smallest character set first --
* printableString. If the string contains characters outside of that character set, it is converted to the next
* character set -- IA5String character set. If that is not enough it is converted to a BMPString, then Universal String
* which contains all characters.
*
* @author Lily Hsiao, Slava Galperin at Netscape Communications, Inc.
*
*/
public class GenericValueConverter implements AVAValueConverter {
public GenericValueConverter() {
}
/**
* Converts a string to a DER encoded ASN.1 primtable string, defined here
* as a PrintableString, IA5String, T.61String, BMPString or
* UniversalString. The string is not expected to be encoded in any form.
*
* <p>
* If an encoder is not available for a character set that is needed to convert the string, the string cannot be
* converted and an IOException is thrown. For example, if the string contains characters outside the
* PrintableString character and only a PrintableString encoder is available then an IOException is thrown.
*
* @param s A string representing a generic attribute string value.
*
* @return The DER value of the attribute.
*
* @exception IOException if the string cannot be converted, such as
* when an encoder needed is
* unavailable.
*/
public DerValue getValue(String s)
throws IOException {
return getValue(s, null);
}
public DerValue getValue(String valueString, byte[] tags) throws IOException {
// try to convert to printable, then t61 the universal -
// i.e. from minimal coverage to the broadest.
if (tags == null || tags.length == 0)
tags = DefEncodingTags;
for (int i = 0; i < tags.length; i++) {
try {
CharsetEncoder encoder = ASN1CharStrConvMap.getDefault().getEncoder(tags[i]);
if (encoder == null)
continue;
CharBuffer charBuffer = CharBuffer.wrap(valueString.toCharArray());
ByteBuffer byteBuffer = encoder.encode(charBuffer);
return new DerValue(tags[i], byteBuffer.array(), byteBuffer.arrayOffset(), byteBuffer.limit());
} catch (CharacterCodingException e) {
continue;
}
}
throw new IOException(
"Cannot convert the string value to a ASN.1 type");
}
/**
* Creates a DerValue from the byte array of BER encoded value.
*
* NOTE: currently only supports DER encoding (a form of BER) on input .
*
* @param berStream Byte array of a BER encoded value.
*
* @return DerValue object.
*
* @exception IOException If the BER value cannot be converted to a
* valid Directory String DER value.
*/
public DerValue getValue(byte[] berByteStream)
throws IOException {
// accepts any tag.
DerValue value = new DerValue(berByteStream);
return value;
}
/**
* Converts a DerValue of ASN1 Character string type to a java string
* (the string is not encoded in any form).
*
* @param avaValue A DerValue
* @return A string representing the attribute value.
* @exception IOException if a decoder needed for the
* conversion is not available or if BER value
* is not one of the ASN1 character string types
* here.
*/
public String getAsString(DerValue avaValue)
throws IOException {
return avaValue.getASN1CharString();
}
private static byte DefEncodingTags[] = {
DerValue.tag_PrintableString,
DerValue.tag_IA5String,
DerValue.tag_BMPString,
DerValue.tag_UTF8String,
DerValue.tag_T61String,
DerValue.tag_UniversalString
};
}
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