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SiHmac.java
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SiHmac.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.facets.auth.signatures;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import lombok.EqualsAndHashCode;
/**
* HMAC codec which supports 256, 384 and 512 bit hash.
*
* <p>
* The class is immutable and thread-safe.
*
* @since 1.4
*/
@EqualsAndHashCode
public final class SiHmac implements Signature {
/**
* The HMAC 256 bit variant.
*/
public static final int HMAC256 = 256;
/**
* The HMAC 384 bit variant.
*/
public static final int HMAC384 = 384;
/**
* The HMAC 512 bit variant.
*/
public static final int HMAC512 = 512;
/**
* The encryption key.
*/
private final byte[] key;
/**
* The bit length parameter.
*/
private final int bits;
/**
* Ctor.
*
* @param key
* The encryption key
*/
public SiHmac(final String key) {
this(key.getBytes(Charset.defaultCharset()), SiHmac.HMAC256);
}
/**
* Ctor.
*
* @param key
* The encryption key
* @param bits
* The signature bit length
*/
public SiHmac(final String key, final int bits) {
this(key.getBytes(Charset.defaultCharset()), bits);
}
/**
* Ctor.
*
* @param key
* The encryption key
* @param bits
* The signature bit length
*/
public SiHmac(final byte[] key, final int bits) {
this.key = key.clone();
this.bits = SiHmac.bitLength(bits);
}
@Override
public byte[] sign(final byte[] data) throws IOException {
return this.encrypt(data);
}
/**
* Signature bit length.
*
* @return The bitlength
*/
public int bitlength() {
return this.bits;
}
/**
* Check for correct bit length.
*
* @param bits
* Given bit length
* @return Original bit length when appropriate, 256 bits otherwise.
*/
private static int bitLength(final int bits) {
int correct = bits;
if (bits != SiHmac.HMAC256
&& bits != SiHmac.HMAC384
&& bits != SiHmac.HMAC512) {
correct = SiHmac.HMAC256;
}
return correct;
}
/**
* Encrypt the given bytes using HMAC.
*
* @param bytes
* Bytes to encrypt
* @return Encrypted bytes
* @throws IOException
* for all unexpected exceptions
*/
private byte[] encrypt(final byte[] bytes) throws IOException {
try (Formatter formatter = new Formatter()) {
for (final byte byt : this.create().doFinal(bytes)) {
formatter.format("%02x", byt);
}
return formatter.toString().getBytes(Charset.defaultCharset());
}
}
/**
* Create new mac based on a valid bit length from {@link Mac} class.
*
* @return The mac
* @throws IOException
* For any unexpected exceptions
*/
private Mac create()
throws IOException {
final String algo = String.format("HmacSHA%s", this.bits);
try {
final SecretKeySpec secret = new SecretKeySpec(
this.key, algo
);
final Mac mac = Mac.getInstance(algo);
mac.init(secret);
return mac;
} catch (final NoSuchAlgorithmException | InvalidKeyException ex) {
throw new IOException(ex);
}
}
}