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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.provider;
import java.io.IOException;
import java.io.Serializable;
import java.security.InvalidKeyException;
import netscape.security.util.BigInt;
import netscape.security.util.DerInputStream;
import netscape.security.util.DerOutputStream;
import netscape.security.util.DerValue;
import netscape.security.util.ObjectIdentifier;
import netscape.security.x509.AlgorithmId;
import netscape.security.x509.X509Key;
/**
* An X.509 public key for the RSA Algorithm.
*
* @author galperin
*
* @version $Revision$, $Date$
*
*/
public final class RSAPublicKey extends X509Key implements Serializable {
/* XXX This currently understands only PKCS#1 RSA Encryption OID
and parameter format
Later we may consider adding X509v3 OID for RSA keys. Besides
different OID it also has a parameter equal to modulus size
in bits (redundant!)
*/
/**
*
*/
private static final long serialVersionUID = 7764823589128565374L;
private static final ObjectIdentifier ALGORITHM_OID =
AlgorithmId.RSAEncryption_oid;
private BigInt modulus;
private BigInt publicExponent;
/*
* Keep this constructor for backwards compatibility with JDK1.1.
*/
public RSAPublicKey() {
}
/**
* Make a RSA public key out of a public exponent and modulus
*/
public RSAPublicKey(BigInt modulus, BigInt publicExponent)
throws InvalidKeyException {
this.modulus = modulus;
this.publicExponent = publicExponent;
this.algid = new AlgorithmId(ALGORITHM_OID);
try {
DerOutputStream out = new DerOutputStream();
out.putInteger(modulus);
out.putInteger(publicExponent);
key = (new DerValue(DerValue.tag_Sequence,
out.toByteArray())).toByteArray();
encode();
} catch (IOException ex) {
throw new InvalidKeyException("could not DER encode : " +
ex.getMessage());
}
}
/**
* Make a RSA public key from its DER encoding (X.509).
*/
public RSAPublicKey(byte[] encoded) throws InvalidKeyException {
decode(encoded);
}
/**
* Get key size as number of bits in modulus
* (Always rounded up to a multiple of 8)
*
*/
public int getKeySize() {
return this.modulus.byteLength() * 8;
}
/**
* Get the raw public exponent
*
*/
public BigInt getPublicExponent() {
return this.publicExponent;
}
/**
* Get the raw modulus
*
*/
public BigInt getModulus() {
return this.modulus;
}
public String toString() {
return "RSA Public Key\n Algorithm: " + algid
+ "\n modulus:\n" + this.modulus.toString() + "\n"
+ "\n publicExponent:\n" + this.publicExponent.toString()
+ "\n";
}
protected void parseKeyBits() throws InvalidKeyException {
if (!this.algid.getOID().equals(ALGORITHM_OID) &&
!this.algid.getOID().equals(AlgorithmId.RSA_oid)) {
throw new InvalidKeyException("Key algorithm OID is not RSA");
}
try {
DerValue val = new DerValue(key);
if (val.tag != DerValue.tag_Sequence) {
throw new InvalidKeyException("Invalid RSA public key format:" +
" must be a SEQUENCE");
}
DerInputStream in = val.data;
this.modulus = in.getInteger();
this.publicExponent = in.getInteger();
} catch (IOException e) {
throw new InvalidKeyException("Invalid RSA public key: " +
e.getMessage());
}
}
}
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