1 /*

     2  * otr4j, the open source java otr library.

     3  *

     4  * Distributable under LGPL license.

     5  * See terms of license at gnu.org.

     6  */

     7 

     8 package net.java.otr4j.crypto;

     9 

    10 import java.math.BigInteger;

    11 import java.security.KeyPair;

    12 import java.security.PrivateKey;

    13 import java.security.PublicKey;

    14 

    15 import javax.crypto.interfaces.DHPublicKey;

    16 

    17 /**

    18  * 

    19  * @author George Politis

    20  * 

    21  */

    22 public interface OtrCryptoEngine {

    23 

    24 	public static final String MODULUS_TEXT = "00FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF";

    25 	public static final BigInteger MODULUS = new BigInteger(MODULUS_TEXT, 16);

    26 	public static final BigInteger BIGINTEGER_TWO = BigInteger.valueOf(2);

    27 	public static final BigInteger MODULUS_MINUS_TWO = MODULUS

    28 			.subtract(BIGINTEGER_TWO);

    29 

    30 	public static String GENERATOR_TEXT = "2";

    31 	public static BigInteger GENERATOR = new BigInteger(GENERATOR_TEXT, 10);

    32 

    33 	public static final int AES_KEY_BYTE_LENGTH = 16;

    34 	public static final int SHA256_HMAC_KEY_BYTE_LENGTH = 32;

    35 	public static final int DH_PRIVATE_KEY_MINIMUM_BIT_LENGTH = 320;

    36 	public static final byte[] ZERO_CTR = new byte[] { 0x00, 0x00, 0x00, 0x00,

    37 			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

    38 			0x00 };

    39 

    40 	public static final int DSA_PUB_TYPE = 0;

    41 

    42 	public abstract KeyPair generateDHKeyPair() throws OtrCryptoException;

    43 

    44 	public abstract DHPublicKey getDHPublicKey(byte[] mpiBytes)

    45 			throws OtrCryptoException;

    46 

    47 	public abstract DHPublicKey getDHPublicKey(BigInteger mpi)

    48 			throws OtrCryptoException;

    49 

    50 	public abstract byte[] sha256Hmac(byte[] b, byte[] key)

    51 			throws OtrCryptoException;

    52 

    53 	public abstract byte[] sha256Hmac(byte[] b, byte[] key, int length)

    54 			throws OtrCryptoException;

    55 

    56 	public abstract byte[] sha1Hmac(byte[] b, byte[] key, int length)

    57 			throws OtrCryptoException;

    58 

    59 	public abstract byte[] sha256Hmac160(byte[] b, byte[] key)

    60 			throws OtrCryptoException;

    61 

    62 	public abstract byte[] sha256Hash(byte[] b) throws OtrCryptoException;

    63 

    64 	public abstract byte[] sha1Hash(byte[] b) throws OtrCryptoException;

    65 

    66 	public abstract byte[] aesDecrypt(byte[] key, byte[] ctr, byte[] b)

    67 			throws OtrCryptoException;

    68 

    69 	public abstract byte[] aesEncrypt(byte[] key, byte[] ctr, byte[] b)

    70 			throws OtrCryptoException;

    71 

    72 	public abstract BigInteger generateSecret(PrivateKey privKey,

    73 			PublicKey pubKey) throws OtrCryptoException;

    74 

    75 	public abstract byte[] sign(byte[] b, PrivateKey privatekey)

    76 			throws OtrCryptoException;

    77 

    78 	public abstract boolean verify(byte[] b, PublicKey pubKey, byte[] rs)

    79 			throws OtrCryptoException;

    80 

    81 	public abstract String getFingerprint(PublicKey pubKey)

    82 			throws OtrCryptoException;

    83 }