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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.asn1.x509;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERPrintableString;
import org.bouncycastle.util.Strings;

/**
 * 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).
 * 

* An example of an encoder look like below: *

 * public class X509DirEntryConverter
 *     extends X509NameEntryConverter
 * {
 *     public ASN1Primitive getConvertedValue(
 *         ASN1ObjectIdentifier  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);
 *         }
 *     }
 * }
 * 
*/ 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 ASN1Primitive convertHexEncoded( String str, int off) throws IOException { str = Strings.toLowerCase(str); byte[] data = new byte[(str.length() - off) / 2]; for (int index = 0; index != data.length; index++) { char left = str.charAt((index * 2) + off); char right = str.charAt((index * 2) + off + 1); if (left < 'a') { data[index] = (byte)((left - '0') << 4); } else { data[index] = (byte)((left - 'a' + 10) << 4); } if (right < 'a') { data[index] |= (byte)(right - '0'); } else { data[index] |= (byte)(right - 'a' + 10); } } ASN1InputStream aIn = new ASN1InputStream(data); return aIn.readObject(); } /** * return true if the passed in String can be represented without * loss as a PrintableString, false otherwise. */ protected boolean 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 ASN1Primitive getConvertedValue(ASN1ObjectIdentifier oid, String value); }




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