* The authority key identifier extension provides a means of identifying the particular public key used to sign a * certificate. This extension would be used where an issuer has multiple signing keys (either due to multiple * concurrent key pairs or due to changeover). *
* The ASN.1 syntax for this is: * *
* AuthorityKeyIdentifier ::= SEQUENCE {
* keyIdentifier [0] KeyIdentifier OPTIONAL,
* authorityCertIssuer [1] GeneralNames OPTIONAL,
* authorityCertSerialNumber [2] CertificateSerialNumber OPTIONAL
* }
* KeyIdentifier ::= OCTET STRING
*
*
* @author Amit Kapoor
* @author Hemma Prafullchandra
* @version 1.9
* @see Extension
* @see CertAttrSet
*/
public class AuthorityKeyIdentifierExtension extends Extension
implements CertAttrSet {
/**
*
*/
private static final long serialVersionUID = -157913621972354170L;
/**
* Identifier for this attribute, to be used with the
* get, set, delete methods of Certificate, x509 type.
*/
public static final String IDENT =
"x509.info.extensions.AuthorityKeyIdentifier";
/**
* Attribute names.
*/
public static final String NAME = "AuthorityKeyIdentifier";
public static final String KEY_ID = "key_id";
public static final String AUTH_NAME = "auth_name";
public static final String SERIAL_NUMBER = "serial_number";
// Private data members
private static final byte TAG_ID = 0;
private static final byte TAG_NAMES = 1;
private static final byte TAG_SERIAL_NUM = 2;
private KeyIdentifier id = null;
private GeneralNames names = null;
private SerialNumber serialNum = null;
// Encode only the extension value
private void encodeThis() throws IOException {
try (DerOutputStream tmp = new DerOutputStream();
DerOutputStream seq = new DerOutputStream()) {
if (id != null) {
DerOutputStream tmp1 = new DerOutputStream();
id.encode(tmp1);
tmp.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
false, TAG_ID), tmp1);
}
try {
if (names != null) {
DerOutputStream tmp1 = new DerOutputStream();
names.encode(tmp1);
tmp.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
true, TAG_NAMES), tmp1);
}
} catch (Exception e) {
throw new IOException(e);
}
if (serialNum != null) {
DerOutputStream tmp1 = new DerOutputStream();
serialNum.encode(tmp1);
tmp.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
false, TAG_SERIAL_NUM), tmp1);
}
seq.write(DerValue.tag_Sequence, tmp);
this.extensionValue = seq.toByteArray();
}
}
/**
* Exposed critical parameter. 99/11/03
*/
public AuthorityKeyIdentifierExtension(boolean critical,
KeyIdentifier kid, GeneralNames name,
SerialNumber sn)
throws IOException {
this.id = kid;
this.names = name;
this.serialNum = sn;
this.extensionId = PKIXExtensions.AuthorityKey_Id;
this.critical = critical;
encodeThis();
}
/**
* The default constructor for this extension. Null parameters make
* the element optional (not present).
*
* @param id the KeyIdentifier associated with this extension.
* @param names the GeneralNames associated with this extension
* @param serialNum the CertificateSerialNumber associated with
* this extension.
* @exception IOException on error.
*/
public AuthorityKeyIdentifierExtension(KeyIdentifier kid, GeneralNames name,
SerialNumber sn)
throws IOException {
this.id = kid;
this.names = name;
this.serialNum = sn;
this.extensionId = PKIXExtensions.AuthorityKey_Id;
this.critical = false;
encodeThis();
}
/**
* Create the extension from the passed DER encoded value of the same.
*
* @param critical true if the extension is to be treated as critical.
* @param value Array of DER encoded bytes of the actual value.
* @exception IOException on error.
*/
public AuthorityKeyIdentifierExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.AuthorityKey_Id;
this.critical = critical.booleanValue();
if (!(value instanceof byte[]))
throw new IOException("Illegal argument type");
int len = Array.getLength(value);
byte[] extValue = new byte[len];
System.arraycopy(value, 0, extValue, 0, len);
this.extensionValue = extValue;
DerValue val = new DerValue(extValue);
if (val.tag != DerValue.tag_Sequence) {
throw new IOException("Invalid encoding for " +
"AuthorityKeyIdentifierExtension.");
}
// NB. this is always encoded with the IMPLICIT tag
// The checks only make sense if we assume implicit tagging,
// with explicit tagging the form is always constructed.
while (val.data.available() != 0) {
DerValue opt = val.data.getDerValue();
if (opt.isContextSpecific(TAG_ID) && !opt.isConstructed()) {
if (id != null)
throw new IOException("Duplicate KeyIdentifier in " +
"AuthorityKeyIdentifier.");
opt.resetTag(DerValue.tag_OctetString);
id = new KeyIdentifier(opt);
} else if (opt.isContextSpecific(TAG_NAMES) &&
opt.isConstructed()) {
if (names != null)
throw new IOException("Duplicate GeneralNames in " +
"AuthorityKeyIdentifier.");
try {
opt.resetTag(DerValue.tag_Sequence);
names = new GeneralNames(opt);
} catch (GeneralNamesException e) {
throw new IOException(e);
}
} else if (opt.isContextSpecific(TAG_SERIAL_NUM) &&
!opt.isConstructed()) {
if (serialNum != null)
throw new IOException("Duplicate SerialNumber in " +
"AuthorityKeyIdentifier.");
opt.resetTag(DerValue.tag_Integer);
serialNum = new SerialNumber(opt);
} else
throw new IOException("Invalid encoding of " +
"AuthorityKeyIdentifierExtension.");
}
}
/**
* Return the object as a string.
*/
public String toString() {
String s = super.toString() + "AuthorityKeyIdentifier [\n";
if (id != null) {
s += id.toString();
}
if (names != null) {
s += names.toString() + "\n";
}
if (serialNum != null) {
s += serialNum.toString() + "\n";
}
return (s + "]\n");
}
/**
* Decode the extension from the InputStream.
*
* @param in the InputStream to unmarshal the contents from.
* @exception IOException on decoding or validity errors.
*/
public void decode(InputStream in) throws IOException {
throw new IOException("Method not to be called directly.");
}
/**
* Write the extension to the OutputStream.
*
* @param out the OutputStream to write the extension to.
* @exception IOException on error.
*/
public void encode(OutputStream out) throws IOException {
DerOutputStream tmp = new DerOutputStream();
if (this.extensionValue == null) {
extensionId = PKIXExtensions.AuthorityKey_Id;
critical = false;
encodeThis();
}
super.encode(tmp);
out.write(tmp.toByteArray());
}
/**
* Set the attribute value.
*/
public void set(String name, Object obj) throws IOException {
clearValue();
if (name.equalsIgnoreCase(KEY_ID)) {
if (!(obj instanceof KeyIdentifier)) {
throw new IOException("Attribute value should be of " +
"type KeyIdentifier.");
}
id = (KeyIdentifier) obj;
} else if (name.equalsIgnoreCase(AUTH_NAME)) {
if (!(obj instanceof GeneralNames)) {
throw new IOException("Attribute value should be of " +
"type GeneralNames.");
}
names = (GeneralNames) obj;
} else if (name.equalsIgnoreCase(SERIAL_NUMBER)) {
if (!(obj instanceof SerialNumber)) {
throw new IOException("Attribute value should be of " +
"type SerialNumber.");
}
serialNum = (SerialNumber) obj;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:AuthorityKeyIdentifier.");
}
}
/**
* Get the attribute value.
*/
public Object get(String name) throws IOException {
if (name.equalsIgnoreCase(KEY_ID)) {
return (id);
} else if (name.equalsIgnoreCase(AUTH_NAME)) {
return (names);
} else if (name.equalsIgnoreCase(SERIAL_NUMBER)) {
return (serialNum);
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:AuthorityKeyIdentifier.");
}
}
/**
* Delete the attribute value.
*/
public void delete(String name) throws IOException {
if (name.equalsIgnoreCase(KEY_ID)) {
id = null;
} else if (name.equalsIgnoreCase(AUTH_NAME)) {
names = null;
} else if (name.equalsIgnoreCase(SERIAL_NUMBER)) {
serialNum = null;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:AuthorityKeyIdentifier.");
}
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration