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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 1.4.
package org.bouncycastle.asn1.x500.style;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.ASN1UniversalString;
import org.bouncycastle.asn1.x500.AttributeTypeAndValue;
import org.bouncycastle.asn1.x500.RDN;
import org.bouncycastle.asn1.x500.X500NameBuilder;
import org.bouncycastle.asn1.x500.X500NameStyle;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;
public class IETFUtils
{
private static String unescape(String elt)
{
if (elt.length() == 0 || (elt.indexOf('\\') < 0 && elt.indexOf('"') < 0))
{
return elt.trim();
}
char[] elts = elt.toCharArray();
boolean escaped = false;
boolean quoted = false;
StringBuffer buf = new StringBuffer(elt.length());
int start = 0;
// if it's an escaped hash string and not an actual encoding in string form
// we need to leave it escaped.
if (elts[0] == '\\')
{
if (elts[1] == '#')
{
start = 2;
buf.append("\\#");
}
}
boolean nonWhiteSpaceEncountered = false;
int lastEscaped = 0;
char hex1 = 0;
for (int i = start; i != elts.length; i++)
{
char c = elts[i];
if (c != ' ')
{
nonWhiteSpaceEncountered = true;
}
if (c == '"')
{
if (!escaped)
{
quoted = !quoted;
}
else
{
buf.append(c);
}
escaped = false;
}
else if (c == '\\' && !(escaped || quoted))
{
escaped = true;
lastEscaped = buf.length();
}
else
{
if (c == ' ' && !escaped && !nonWhiteSpaceEncountered)
{
continue;
}
if (escaped && isHexDigit(c))
{
if (hex1 != 0)
{
buf.append((char)(convertHex(hex1) * 16 + convertHex(c)));
escaped = false;
hex1 = 0;
continue;
}
hex1 = c;
continue;
}
buf.append(c);
escaped = false;
}
}
if (buf.length() > 0)
{
while (buf.charAt(buf.length() - 1) == ' ' && lastEscaped != (buf.length() - 1))
{
buf.setLength(buf.length() - 1);
}
}
return buf.toString();
}
private static boolean isHexDigit(char c)
{
return ('0' <= c && c <= '9') || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F');
}
private static int convertHex(char c)
{
if ('0' <= c && c <= '9')
{
return c - '0';
}
if ('a' <= c && c <= 'f')
{
return c - 'a' + 10;
}
return c - 'A' + 10;
}
public static RDN[] rDNsFromString(String name, X500NameStyle x500Style)
{
X500NameTokenizer nTok = new X500NameTokenizer(name);
X500NameBuilder builder = new X500NameBuilder(x500Style);
while (nTok.hasMoreTokens())
{
String token = nTok.nextToken();
if (token.indexOf('+') > 0)
{
X500NameTokenizer pTok = new X500NameTokenizer(token, '+');
X500NameTokenizer vTok = new X500NameTokenizer(pTok.nextToken(), '=');
String attr = vTok.nextToken();
if (!vTok.hasMoreTokens())
{
throw new IllegalArgumentException("badly formatted directory string");
}
String value = vTok.nextToken();
ASN1ObjectIdentifier oid = x500Style.attrNameToOID(attr.trim());
if (pTok.hasMoreTokens())
{
Vector oids = new Vector();
Vector values = new Vector();
oids.addElement(oid);
values.addElement(unescape(value));
while (pTok.hasMoreTokens())
{
vTok = new X500NameTokenizer(pTok.nextToken(), '=');
attr = vTok.nextToken();
if (!vTok.hasMoreTokens())
{
throw new IllegalArgumentException("badly formatted directory string");
}
value = vTok.nextToken();
oid = x500Style.attrNameToOID(attr.trim());
oids.addElement(oid);
values.addElement(unescape(value));
}
builder.addMultiValuedRDN(toOIDArray(oids), toValueArray(values));
}
else
{
builder.addRDN(oid, unescape(value));
}
}
else
{
X500NameTokenizer vTok = new X500NameTokenizer(token, '=');
String attr = vTok.nextToken();
if (!vTok.hasMoreTokens())
{
throw new IllegalArgumentException("badly formatted directory string");
}
String value = vTok.nextToken();
ASN1ObjectIdentifier oid = x500Style.attrNameToOID(attr.trim());
builder.addRDN(oid, unescape(value));
}
}
return builder.build().getRDNs();
}
private static String[] toValueArray(Vector values)
{
String[] tmp = new String[values.size()];
for (int i = 0; i != tmp.length; i++)
{
tmp[i] = (String)values.elementAt(i);
}
return tmp;
}
private static ASN1ObjectIdentifier[] toOIDArray(Vector oids)
{
ASN1ObjectIdentifier[] tmp = new ASN1ObjectIdentifier[oids.size()];
for (int i = 0; i != tmp.length; i++)
{
tmp[i] = (ASN1ObjectIdentifier)oids.elementAt(i);
}
return tmp;
}
public static String[] findAttrNamesForOID(
ASN1ObjectIdentifier oid,
Hashtable lookup)
{
int count = 0;
for (Enumeration en = lookup.elements(); en.hasMoreElements();)
{
if (oid.equals(en.nextElement()))
{
count++;
}
}
String[] aliases = new String[count];
count = 0;
for (Enumeration en = lookup.keys(); en.hasMoreElements();)
{
String key = (String)en.nextElement();
if (oid.equals(lookup.get(key)))
{
aliases[count++] = key;
}
}
return aliases;
}
public static ASN1ObjectIdentifier decodeAttrName(
String name,
Hashtable lookUp)
{
if (Strings.toUpperCase(name).startsWith("OID."))
{
return new ASN1ObjectIdentifier(name.substring(4));
}
else if (name.charAt(0) >= '0' && name.charAt(0) <= '9')
{
return new ASN1ObjectIdentifier(name);
}
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)lookUp.get(Strings.toLowerCase(name));
if (oid == null)
{
throw new IllegalArgumentException("Unknown object id - " + name + " - passed to distinguished name");
}
return oid;
}
public static ASN1Encodable valueFromHexString(
String str,
int off)
throws IOException
{
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);
data[index] = (byte)((convertHex(left) << 4) | convertHex(right));
}
return ASN1Primitive.fromByteArray(data);
}
public static void appendRDN(
StringBuffer buf,
RDN rdn,
Hashtable oidSymbols)
{
if (rdn.isMultiValued())
{
AttributeTypeAndValue[] atv = rdn.getTypesAndValues();
boolean firstAtv = true;
for (int j = 0; j != atv.length; j++)
{
if (firstAtv)
{
firstAtv = false;
}
else
{
buf.append('+');
}
IETFUtils.appendTypeAndValue(buf, atv[j], oidSymbols);
}
}
else
{
if (rdn.getFirst() != null)
{
IETFUtils.appendTypeAndValue(buf, rdn.getFirst(), oidSymbols);
}
}
}
public static void appendTypeAndValue(
StringBuffer buf,
AttributeTypeAndValue typeAndValue,
Hashtable oidSymbols)
{
String sym = (String)oidSymbols.get(typeAndValue.getType());
if (sym != null)
{
buf.append(sym);
}
else
{
buf.append(typeAndValue.getType().getId());
}
buf.append('=');
buf.append(valueToString(typeAndValue.getValue()));
}
public static String valueToString(ASN1Encodable value)
{
StringBuffer vBuf = new StringBuffer();
if (value instanceof ASN1String && !(value instanceof ASN1UniversalString))
{
String v = ((ASN1String)value).getString();
if (v.length() > 0 && v.charAt(0) == '#')
{
vBuf.append('\\');
}
vBuf.append(v);
}
else
{
try
{
vBuf.append('#');
// -DM Hex.toHexString
vBuf.append(Hex.toHexString(value.toASN1Primitive().getEncoded(ASN1Encoding.DER)));
}
catch (IOException e)
{
throw new IllegalArgumentException("Other value has no encoded form");
}
}
int end = vBuf.length();
int index = 0;
if (vBuf.length() >= 2 && vBuf.charAt(0) == '\\' && vBuf.charAt(1) == '#')
{
index += 2;
}
while (index != end)
{
switch (vBuf.charAt(index))
{
case ',':
case '"':
case '\\':
case '+':
case '=':
case '<':
case '>':
case ';':
{
vBuf.insert(index, "\\");
index += 2;
++end;
break;
}
default:
{
++index;
break;
}
}
}
int start = 0;
if (vBuf.length() > 0)
{
while (vBuf.length() > start && vBuf.charAt(start) == ' ')
{
vBuf.insert(start, "\\");
start += 2;
}
}
int endBuf = vBuf.length() - 1;
while (endBuf >= start && vBuf.charAt(endBuf) == ' ')
{
vBuf.insert(endBuf, '\\');
endBuf--;
}
return vBuf.toString();
}
public static String canonicalize(String s)
{
if (s.length() > 0 && s.charAt(0) == '#')
{
ASN1Primitive obj = decodeObject(s);
if (obj instanceof ASN1String)
{
s = ((ASN1String)obj).getString();
}
}
s = Strings.toLowerCase(s);
int length = s.length();
if (length < 2)
{
return s;
}
int start = 0, last = length - 1;
while (start < last && s.charAt(start) == '\\' && s.charAt(start + 1) == ' ')
{
start += 2;
}
int end = last, first = start + 1;
while (end > first && s.charAt(end - 1) == '\\' && s.charAt(end) == ' ')
{
end -= 2;
}
if (start > 0 || end < last)
{
s = s.substring(start, end + 1);
}
return stripInternalSpaces(s);
}
public static String canonicalString(ASN1Encodable value)
{
return canonicalize(valueToString(value));
}
private static ASN1Primitive decodeObject(String oValue)
{
try
{
return ASN1Primitive.fromByteArray(Hex.decodeStrict(oValue, 1, oValue.length() - 1));
}
catch (IOException e)
{
throw new IllegalStateException("unknown encoding in name: " + e);
}
}
public static String stripInternalSpaces(
String str)
{
if (str.indexOf(" ") < 0)
{
return str;
}
StringBuffer res = new StringBuffer();
char c1 = str.charAt(0);
res.append(c1);
for (int k = 1; k < str.length(); k++)
{
char c2 = str.charAt(k);
if (!(c1 == ' ' && c2 == ' '))
{
res.append(c2);
c1 = c2;
}
}
return res.toString();
}
public static boolean rDNAreEqual(RDN rdn1, RDN rdn2)
{
if (rdn1.size() != rdn2.size())
{
return false;
}
AttributeTypeAndValue[] atvs1 = rdn1.getTypesAndValues();
AttributeTypeAndValue[] atvs2 = rdn2.getTypesAndValues();
if (atvs1.length != atvs2.length)
{
return false;
}
for (int i = 0; i != atvs1.length; i++)
{
if (!atvAreEqual(atvs1[i], atvs2[i]))
{
return false;
}
}
return true;
}
private static boolean atvAreEqual(AttributeTypeAndValue atv1, AttributeTypeAndValue atv2)
{
if (atv1 == atv2)
{
return true;
}
if (null == atv1 || null == atv2)
{
return false;
}
ASN1ObjectIdentifier o1 = atv1.getType();
ASN1ObjectIdentifier o2 = atv2.getType();
if (!o1.equals(o2))
{
return false;
}
String v1 = canonicalString(atv1.getValue());
String v2 = canonicalString(atv2.getValue());
if (!v1.equals(v2))
{
return false;
}
return true;
}
}