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1: /* GnuRSAKey.java -- 2: Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc. 3: 4: This file is a part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2 of the License, or (at 9: your option) any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; if not, write to the Free Software 18: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 19: USA 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.java.security.key.rsa; 40: 41: import gnu.java.security.Registry; 42: import gnu.java.security.action.GetPropertyAction; 43: import gnu.java.security.util.FormatUtil; 44: 45: import java.math.BigInteger; 46: import java.security.AccessController; 47: import java.security.Key; 48: import java.security.interfaces.RSAKey; 49: 50: /** 51: * A base asbtract class for both public and private RSA keys. 52: */ 53: public abstract class GnuRSAKey 54: implements Key, RSAKey 55: { 56: /** The public modulus of an RSA key pair. */ 57: private final BigInteger n; 58: 59: /** The public exponent of an RSA key pair. */ 60: private final BigInteger e; 61: 62: /** 63: * Identifier of the default encoding format to use when externalizing the key 64: * material. 65: */ 66: protected final int defaultFormat; 67: 68: /** String representation of this key. Cached for speed. */ 69: private transient String str; 70: 71: /** 72: * Trivial protected constructor. 73: * 74: * @param defaultFormat the identifier of the encoding format to use by 75: * default when externalizing the key. 76: * @param n the public modulus <code>n</code>. 77: * @param e the public exponent <code>e</code>. 78: */ 79: protected GnuRSAKey(int defaultFormat, BigInteger n, BigInteger e) 80: { 81: super(); 82: 83: this.defaultFormat = defaultFormat <= 0 ? Registry.RAW_ENCODING_ID 84: : defaultFormat; 85: this.n = n; 86: this.e = e; 87: } 88: 89: public BigInteger getModulus() 90: { 91: return getN(); 92: } 93: 94: public String getAlgorithm() 95: { 96: return Registry.RSA_KPG; 97: } 98: 99: /** @deprecated see getEncoded(int). */ 100: public byte[] getEncoded() 101: { 102: return getEncoded(defaultFormat); 103: } 104: 105: public String getFormat() 106: { 107: return FormatUtil.getEncodingShortName(defaultFormat); 108: } 109: 110: /** 111: * Returns the modulus <code>n</code>. 112: * 113: * @return the modulus <code>n</code>. 114: */ 115: public BigInteger getN() 116: { 117: return n; 118: } 119: 120: /** 121: * Returns the public exponent <code>e</code>. 122: * 123: * @return the public exponent <code>e</code>. 124: */ 125: public BigInteger getPublicExponent() 126: { 127: return getE(); 128: } 129: 130: /** 131: * Same as {@link #getPublicExponent()}. 132: * 133: * @return the public exponent <code>e</code>. 134: */ 135: public BigInteger getE() 136: { 137: return e; 138: } 139: 140: /** 141: * Returns <code>true</code> if the designated object is an instance of 142: * {@link RSAKey} and has the same RSA parameter values as this one. 143: * 144: * @param obj the other non-null RSA key to compare to. 145: * @return <code>true</code> if the designated object is of the same type 146: * and value as this one. 147: */ 148: public boolean equals(final Object obj) 149: { 150: if (obj == null) 151: return false; 152: 153: if (! (obj instanceof RSAKey)) 154: return false; 155: 156: final RSAKey that = (RSAKey) obj; 157: return n.equals(that.getModulus()); 158: } 159: 160: public String toString() 161: { 162: if (str == null) 163: { 164: String ls = (String) AccessController.doPrivileged 165: (new GetPropertyAction("line.separator")); 166: str = new StringBuilder(ls) 167: .append("defaultFormat=").append(defaultFormat).append(",").append(ls) 168: .append("n=0x").append(n.toString(16)).append(",").append(ls) 169: .append("e=0x").append(e.toString(16)) 170: .toString(); 171: } 172: return str; 173: } 174: 175: public abstract byte[] getEncoded(int format); 176: }