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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/sig/BaseSignature.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/sig/BaseSignature.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/sig/BaseSignature.java | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/sig/BaseSignature.java b/libjava/classpath/gnu/java/security/sig/BaseSignature.java new file mode 100644 index 000000000..ef4d87f26 --- /dev/null +++ b/libjava/classpath/gnu/java/security/sig/BaseSignature.java @@ -0,0 +1,219 @@ +/* BaseSignature.java -- + Copyright (C) 2001, 2002, 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.java.security.sig; + +import gnu.java.security.hash.IMessageDigest; +import gnu.java.security.prng.IRandom; +import gnu.java.security.prng.LimitReachedException; +import gnu.java.security.util.PRNG; + +import java.security.PrivateKey; +import java.security.PublicKey; +import java.util.Map; +import java.util.Random; + +/** + * A base abstract class to facilitate implementations of concrete Signatures. + */ +public abstract class BaseSignature + implements ISignature +{ + /** The canonical name of this signature scheme. */ + protected String schemeName; + + /** The underlying message digest instance for this signature scheme. */ + protected IMessageDigest md; + + /** The public key to use when verifying signatures. */ + protected PublicKey publicKey; + + /** The private key to use when generating signatures (signing). */ + protected PrivateKey privateKey; + + /** The optional {@link Random} instance to use. */ + private Random rnd; + + /** The optional {@link IRandom} instance to use. */ + private IRandom irnd; + + /** Our default source of randomness. */ + private PRNG prng = null; + + /** + * Trivial constructor. + * + * @param schemeName the name of this signature scheme. + * @param md the underlying instance of the message digest algorithm. + * @throws IllegalArgumentException if the designated hash instance is + * <code>null</code>. + */ + protected BaseSignature(String schemeName, IMessageDigest md) + { + super(); + + this.schemeName = schemeName; + if (md == null) + throw new IllegalArgumentException("Message digest MUST NOT be null"); + + this.md = md; + } + + public String name() + { + return schemeName + "-" + md.name(); + } + + public void setupVerify(Map attributes) throws IllegalArgumentException + { + setup(attributes); + // do we have a public key? + PublicKey key = (PublicKey) attributes.get(VERIFIER_KEY); + if (key != null) + setupForVerification(key); + } + + public void setupSign(Map attributes) throws IllegalArgumentException + { + setup(attributes); + // do we have a private key? + PrivateKey key = (PrivateKey) attributes.get(SIGNER_KEY); + if (key != null) + setupForSigning(key); + } + + public void update(byte b) + { + if (md == null) + throw new IllegalStateException(); + + md.update(b); + } + + public void update(byte[] b, int off, int len) + { + if (md == null) + throw new IllegalStateException(); + + md.update(b, off, len); + } + + public Object sign() + { + if (md == null || privateKey == null) + throw new IllegalStateException(); + + return generateSignature(); + } + + public boolean verify(Object sig) + { + if (md == null || publicKey == null) + throw new IllegalStateException(); + + return verifySignature(sig); + } + + public abstract Object clone(); + + protected abstract void setupForVerification(PublicKey key) + throws IllegalArgumentException; + + protected abstract void setupForSigning(PrivateKey key) + throws IllegalArgumentException; + + protected abstract Object generateSignature() throws IllegalStateException; + + protected abstract boolean verifySignature(Object signature) + throws IllegalStateException; + + /** Initialises the internal fields of this instance. */ + protected void init() + { + md.reset(); + rnd = null; + irnd = null; + publicKey = null; + privateKey = null; + } + + /** + * Fills the designated byte array with random data. + * + * @param buffer the byte array to fill with random data. + */ + protected void nextRandomBytes(byte[] buffer) + { + if (rnd != null) + rnd.nextBytes(buffer); + else if (irnd != null) + try + { + irnd.nextBytes(buffer, 0, buffer.length); + } + catch (IllegalStateException x) + { + throw new RuntimeException("nextRandomBytes(): " + x); + } + catch (LimitReachedException x) + { + throw new RuntimeException("nextRandomBytes(): " + x); + } + else + getDefaultPRNG().nextBytes(buffer); + } + + private void setup(Map attributes) + { + init(); + // do we have a Random or SecureRandom, or should we use our own? + Object obj = attributes.get(SOURCE_OF_RANDOMNESS); + if (obj instanceof Random) + rnd = (Random) obj; + else if (obj instanceof IRandom) + irnd = (IRandom) obj; + } + + private PRNG getDefaultPRNG() + { + if (prng == null) + prng = PRNG.getInstance(); + + return prng; + } +} |