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using System;
using System.Globalization;
using System.IO;
using System.Text;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1.X509
{
/**
* It turns out that the number of standard ways the fields in a DN should be
* encoded into their ASN.1 counterparts is rapidly approaching the
* number of machines on the internet. By default the X509Name class
* will produce UTF8Strings in line with the current recommendations (RFC 3280).
* <p>
* An example of an encoder look like below:
* <pre>
* public class X509DirEntryConverter
* : X509NameEntryConverter
* {
* public Asn1Object GetConvertedValue(
* DerObjectIdentifier oid,
* string value)
* {
* if (str.Length() != 0 && str.charAt(0) == '#')
* {
* return ConvertHexEncoded(str, 1);
* }
* if (oid.Equals(EmailAddress))
* {
* return new DerIA5String(str);
* }
* else if (CanBePrintable(str))
* {
* return new DerPrintableString(str);
* }
* else if (CanBeUTF8(str))
* {
* return new DerUtf8String(str);
* }
* else
* {
* return new DerBmpString(str);
* }
* }
* }
* </pre>
* </p>
*/
public abstract class X509NameEntryConverter
{
/**
* Convert an inline encoded hex string rendition of an ASN.1
* object back into its corresponding ASN.1 object.
*
* @param str the hex encoded object
* @param off the index at which the encoding starts
* @return the decoded object
*/
protected Asn1Object ConvertHexEncoded(
string hexString,
int offset)
{
return Asn1Object.FromByteArray(Hex.DecodeStrict(hexString, offset, hexString.Length - offset));
}
/**
* return true if the passed in string can be represented without
* loss as a PrintableString, false otherwise.
*/
protected bool CanBePrintable(
string str)
{
return DerPrintableString.IsPrintableString(str);
}
/**
* Convert the passed in string value into the appropriate ASN.1
* encoded object.
*
* @param oid the oid associated with the value in the DN.
* @param value the value of the particular DN component.
* @return the ASN.1 equivalent for the value.
*/
public abstract Asn1Object GetConvertedValue(DerObjectIdentifier oid, string value);
}
}
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