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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/javax/crypto/sasl/srp/SRP.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/javax/crypto/sasl/srp/SRP.java | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/sasl/srp/SRP.java b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/sasl/srp/SRP.java new file mode 100644 index 000000000..437e42a5a --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/sasl/srp/SRP.java @@ -0,0 +1,255 @@ +/* SRP.java -- + Copyright (C) 2003, 2006 Free Software Foundation, Inc. + +This file is a part of GNU Classpath. + +GNU Classpath 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; either version 2 of the License, or (at +your option) any later version. + +GNU Classpath 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 GNU Classpath; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 +USA + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.javax.crypto.sasl.srp; + +import gnu.java.security.hash.HashFactory; +import gnu.java.security.hash.IMessageDigest; +import gnu.java.security.util.Util; + +import java.io.UnsupportedEncodingException; +import java.math.BigInteger; +import java.util.HashMap; + +/** + * A Factory class that returns SRP Singletons that know all SRP-related + * mathematical computations and protocol-related operations for both the + * client- and server-sides. + */ +public final class SRP +{ + /** The map of already instantiated SRP algorithm instances. */ + private static final HashMap algorithms = new HashMap(); + private static final byte COLON = (byte) 0x3A; + /** The underlying message digest algorithm used for all SRP calculations. */ + private IMessageDigest mda; + + /** Trivial private constructor to enforce Singleton pattern. */ + private SRP(final IMessageDigest mda) + { + super(); + + this.mda = mda; + } + + /** + * Returns an instance of this object that uses the designated message digest + * algorithm as its digest function. + * + * @return an instance of this object for the designated digest name. + */ + public static synchronized SRP instance(String mdName) + { + if (mdName != null) + mdName = mdName.trim().toLowerCase(); + if (mdName == null || mdName.equals("")) + mdName = SRPRegistry.SRP_DEFAULT_DIGEST_NAME; + SRP result = (SRP) algorithms.get(mdName); + if (result == null) + { + final IMessageDigest mda = HashFactory.getInstance(mdName); + result = new SRP(mda); + algorithms.put(mdName, result); + } + return result; + } + + private static final byte[] xor(final byte[] b1, final byte[] b2, + final int length) + { + final byte[] result = new byte[length]; + for (int i = 0; i < length; ++i) + result[i] = (byte)(b1[i] ^ b2[i]); + return result; + } + + /** @return the message digest algorithm name used by this instance. */ + public String getAlgorithm() + { + return mda.name(); + } + + /** + * Returns a new instance of the SRP message digest algorithm --which is + * SHA-160 by default, but could be anything else provided the proper + * conditions as specified in the SRP specifications. + * + * @return a new instance of the underlying SRP message digest algorithm. + * @throws RuntimeException if the implementation of the message digest + * algorithm does not support cloning. + */ + public IMessageDigest newDigest() + { + return (IMessageDigest) mda.clone(); + } + + /** + * Convenience method to return the result of digesting the designated input + * with a new instance of the SRP message digest algorithm. + * + * @param src some bytes to digest. + * @return the bytes constituting the result of digesting the designated input + * with a new instance of the SRP message digest algorithm. + */ + public byte[] digest(final byte[] src) + { + final IMessageDigest hash = (IMessageDigest) mda.clone(); + hash.update(src, 0, src.length); + return hash.digest(); + } + + /** + * Convenience method to return the result of digesting the designated input + * with a new instance of the SRP message digest algorithm. + * + * @param src a String whose bytes (using US-ASCII encoding) are to be + * digested. + * @return the bytes constituting the result of digesting the designated input + * with a new instance of the SRP message digest algorithm. + * @throws UnsupportedEncodingException if US-ASCII charset is not found. + */ + public byte[] digest(final String src) throws UnsupportedEncodingException + { + return digest(src.getBytes("US-ASCII")); + } + + /** + * Convenience method to XOR N bytes from two arrays; N being the output size + * of the SRP message digest algorithm. + * + * @param a the first byte array. + * @param b the second one. + * @return N bytes which are the result of the XOR operations on the first N + * bytes from the designated arrays. N is the size of the SRP message + * digest algorithm; eg. 20 for SHA-160. + */ + public byte[] xor(final byte[] a, final byte[] b) + { + return xor(a, b, mda.hashSize()); + } + + public byte[] generateM1(final BigInteger N, final BigInteger g, + final String U, final byte[] s, final BigInteger A, + final BigInteger B, final byte[] K, final String I, + final String L, final byte[] cn, final byte[] cCB) + throws UnsupportedEncodingException + { + final IMessageDigest hash = (IMessageDigest) mda.clone(); + byte[] b; + b = xor(digest(Util.trim(N)), digest(Util.trim(g))); + hash.update(b, 0, b.length); + b = digest(U); + hash.update(b, 0, b.length); + hash.update(s, 0, s.length); + b = Util.trim(A); + hash.update(b, 0, b.length); + b = Util.trim(B); + hash.update(b, 0, b.length); + hash.update(K, 0, K.length); + b = digest(I); + hash.update(b, 0, b.length); + b = digest(L); + hash.update(b, 0, b.length); + hash.update(cn, 0, cn.length); + hash.update(cCB, 0, cCB.length); + return hash.digest(); + } + + public byte[] generateM2(final BigInteger A, final byte[] M1, final byte[] K, + final String U, final String I, final String o, + final byte[] sid, final int ttl, final byte[] cIV, + final byte[] sIV, final byte[] sCB) + throws UnsupportedEncodingException + { + final IMessageDigest hash = (IMessageDigest) mda.clone(); + byte[] b; + b = Util.trim(A); + hash.update(b, 0, b.length); + hash.update(M1, 0, M1.length); + hash.update(K, 0, K.length); + b = digest(U); + hash.update(b, 0, b.length); + b = digest(I); + hash.update(b, 0, b.length); + b = digest(o); + hash.update(b, 0, b.length); + hash.update(sid, 0, sid.length); + hash.update((byte)(ttl >>> 24)); + hash.update((byte)(ttl >>> 16)); + hash.update((byte)(ttl >>> 8)); + hash.update((byte) ttl); + hash.update(cIV, 0, cIV.length); + hash.update(sIV, 0, sIV.length); + hash.update(sCB, 0, sCB.length); + return hash.digest(); + } + + public byte[] generateKn(final byte[] K, final byte[] cn, final byte[] sn) + { + final IMessageDigest hash = (IMessageDigest) mda.clone(); + hash.update(K, 0, K.length); + hash.update(cn, 0, cn.length); + hash.update(sn, 0, sn.length); + return hash.digest(); + } + + public byte[] computeX(final byte[] s, final String user, + final String password) + throws UnsupportedEncodingException + { + return computeX(s, user.getBytes("US-ASCII"), password.getBytes("US-ASCII")); + } + + public byte[] computeX(final byte[] s, final String user, final byte[] p) + throws UnsupportedEncodingException + { + return computeX(s, user.getBytes("US-ASCII"), p); + } + + private byte[] computeX(final byte[] s, final byte[] user, final byte[] p) + { + final IMessageDigest hash = (IMessageDigest) mda.clone(); + hash.update(user, 0, user.length); + hash.update(COLON); + hash.update(p, 0, p.length); + final byte[] up = hash.digest(); + hash.update(s, 0, s.length); + hash.update(up, 0, up.length); + return hash.digest(); + } +} |