src/net/java/otr4j/crypto/OtrCryptoEngine.java
author Nikita Kozlov <nikita@mbdsys.com>
Tue, 07 Dec 2010 22:57:56 +0100
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permissions -rw-r--r--
I have reimplemented the BeemOtrService in a more "centralized" way.
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/*
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 * otr4j, the open source java otr library.
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 *
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 * Distributable under LGPL license.
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 * See terms of license at gnu.org.
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 */
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package net.java.otr4j.crypto;
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import java.math.BigInteger;
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import java.security.KeyPair;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import javax.crypto.interfaces.DHPublicKey;
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/**
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 * 
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 * @author George Politis
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 * 
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 */
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public interface OtrCryptoEngine {
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	public static final String MODULUS_TEXT = "00FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF";
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	public static final BigInteger MODULUS = new BigInteger(MODULUS_TEXT, 16);
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	public static final BigInteger BIGINTEGER_TWO = BigInteger.valueOf(2);
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	public static final BigInteger MODULUS_MINUS_TWO = MODULUS
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			.subtract(BIGINTEGER_TWO);
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	public static String GENERATOR_TEXT = "2";
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	public static BigInteger GENERATOR = new BigInteger(GENERATOR_TEXT, 10);
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	public static final int AES_KEY_BYTE_LENGTH = 16;
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	public static final int SHA256_HMAC_KEY_BYTE_LENGTH = 32;
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	public static final int DH_PRIVATE_KEY_MINIMUM_BIT_LENGTH = 320;
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	public static final byte[] ZERO_CTR = new byte[] { 0x00, 0x00, 0x00, 0x00,
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			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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			0x00 };
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	public static final int DSA_PUB_TYPE = 0;
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	public abstract KeyPair generateDHKeyPair() throws OtrCryptoException;
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	public abstract DHPublicKey getDHPublicKey(byte[] mpiBytes)
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			throws OtrCryptoException;
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	public abstract DHPublicKey getDHPublicKey(BigInteger mpi)
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			throws OtrCryptoException;
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	public abstract byte[] sha256Hmac(byte[] b, byte[] key)
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			throws OtrCryptoException;
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	public abstract byte[] sha256Hmac(byte[] b, byte[] key, int length)
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			throws OtrCryptoException;
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	public abstract byte[] sha1Hmac(byte[] b, byte[] key, int length)
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			throws OtrCryptoException;
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	public abstract byte[] sha256Hmac160(byte[] b, byte[] key)
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			throws OtrCryptoException;
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	public abstract byte[] sha256Hash(byte[] b) throws OtrCryptoException;
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	public abstract byte[] sha1Hash(byte[] b) throws OtrCryptoException;
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	public abstract byte[] aesDecrypt(byte[] key, byte[] ctr, byte[] b)
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			throws OtrCryptoException;
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	public abstract byte[] aesEncrypt(byte[] key, byte[] ctr, byte[] b)
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			throws OtrCryptoException;
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	public abstract BigInteger generateSecret(PrivateKey privKey,
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			PublicKey pubKey) throws OtrCryptoException;
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	public abstract byte[] sign(byte[] b, PrivateKey privatekey)
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			throws OtrCryptoException;
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	public abstract boolean verify(byte[] b, PublicKey pubKey, byte[] rs)
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			throws OtrCryptoException;
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	public abstract String getFingerprint(PublicKey pubKey)
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			throws OtrCryptoException;
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}