diff options
Diffstat (limited to 'lib/src/main/java/com/trilead/ssh2/crypto/KeyMaterial.java')
| -rw-r--r-- | lib/src/main/java/com/trilead/ssh2/crypto/KeyMaterial.java | 178 |
1 files changed, 89 insertions, 89 deletions
diff --git a/lib/src/main/java/com/trilead/ssh2/crypto/KeyMaterial.java b/lib/src/main/java/com/trilead/ssh2/crypto/KeyMaterial.java index 035717d..499422f 100644 --- a/lib/src/main/java/com/trilead/ssh2/crypto/KeyMaterial.java +++ b/lib/src/main/java/com/trilead/ssh2/crypto/KeyMaterial.java @@ -1,98 +1,98 @@ -
-package com.trilead.ssh2.crypto;
-
-
-import java.math.BigInteger;
+ +package com.trilead.ssh2.crypto; + + +import java.math.BigInteger; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; -
-import com.trilead.ssh2.crypto.digest.HashForSSH2Types;
-
-/**
- * Establishes key material for iv/key/mac (both directions).
- *
- * @author Christian Plattner, plattner@trilead.com
- * @version $Id: KeyMaterial.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $
- */
-public class KeyMaterial
-{
- public byte[] initial_iv_client_to_server;
- public byte[] initial_iv_server_to_client;
- public byte[] enc_key_client_to_server;
- public byte[] enc_key_server_to_client;
- public byte[] integrity_key_client_to_server;
- public byte[] integrity_key_server_to_client;
-
- private static byte[] calculateKey(HashForSSH2Types sh, BigInteger K, byte[] H, byte type, byte[] SessionID,
- int keyLength)
- {
- byte[] res = new byte[keyLength];
-
- int dglen = sh.getDigestLength();
- int numRounds = (keyLength + dglen - 1) / dglen;
-
- byte[][] tmp = new byte[numRounds][];
-
- sh.reset();
- sh.updateBigInt(K);
- sh.updateBytes(H);
- sh.updateByte(type);
- sh.updateBytes(SessionID);
-
- tmp[0] = sh.getDigest();
-
- int off = 0;
- int produced = Math.min(dglen, keyLength);
-
- System.arraycopy(tmp[0], 0, res, off, produced);
-
- keyLength -= produced;
- off += produced;
-
- for (int i = 1; i < numRounds; i++)
- {
- sh.updateBigInt(K);
- sh.updateBytes(H);
-
- for (int j = 0; j < i; j++)
- sh.updateBytes(tmp[j]);
-
- tmp[i] = sh.getDigest();
-
- produced = Math.min(dglen, keyLength);
- System.arraycopy(tmp[i], 0, res, off, produced);
- keyLength -= produced;
- off += produced;
- }
-
- return res;
- }
-
+ +import com.trilead.ssh2.crypto.digest.HashForSSH2Types; + +/** + * Establishes key material for iv/key/mac (both directions). + * + * @author Christian Plattner, plattner@trilead.com + * @version $Id: KeyMaterial.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $ + */ +public class KeyMaterial +{ + public byte[] initial_iv_client_to_server; + public byte[] initial_iv_server_to_client; + public byte[] enc_key_client_to_server; + public byte[] enc_key_server_to_client; + public byte[] integrity_key_client_to_server; + public byte[] integrity_key_server_to_client; + + private static byte[] calculateKey(HashForSSH2Types sh, BigInteger K, byte[] H, byte type, byte[] SessionID, + int keyLength) + { + byte[] res = new byte[keyLength]; + + int dglen = sh.getDigestLength(); + int numRounds = (keyLength + dglen - 1) / dglen; + + byte[][] tmp = new byte[numRounds][]; + + sh.reset(); + sh.updateBigInt(K); + sh.updateBytes(H); + sh.updateByte(type); + sh.updateBytes(SessionID); + + tmp[0] = sh.getDigest(); + + int off = 0; + int produced = Math.min(dglen, keyLength); + + System.arraycopy(tmp[0], 0, res, off, produced); + + keyLength -= produced; + off += produced; + + for (int i = 1; i < numRounds; i++) + { + sh.updateBigInt(K); + sh.updateBytes(H); + + for (int j = 0; j < i; j++) + sh.updateBytes(tmp[j]); + + tmp[i] = sh.getDigest(); + + produced = Math.min(dglen, keyLength); + System.arraycopy(tmp[i], 0, res, off, produced); + keyLength -= produced; + off += produced; + } + + return res; + } + public static KeyMaterial create(String hashAlgo, byte[] H, BigInteger K, byte[] SessionID, int keyLengthCS, - int blockSizeCS, int macLengthCS, int keyLengthSC, int blockSizeSC, int macLengthSC)
- throws IllegalArgumentException
- {
- KeyMaterial km = new KeyMaterial();
-
+ int blockSizeCS, int macLengthCS, int keyLengthSC, int blockSizeSC, int macLengthSC) + throws IllegalArgumentException + { + KeyMaterial km = new KeyMaterial(); + HashForSSH2Types sh; try { sh = new HashForSSH2Types(MessageDigest.getInstance(hashAlgo)); } catch (NoSuchAlgorithmException e) { throw new IllegalArgumentException(e); } -
- km.initial_iv_client_to_server = calculateKey(sh, K, H, (byte) 'A', SessionID, blockSizeCS);
-
- km.initial_iv_server_to_client = calculateKey(sh, K, H, (byte) 'B', SessionID, blockSizeSC);
-
- km.enc_key_client_to_server = calculateKey(sh, K, H, (byte) 'C', SessionID, keyLengthCS);
-
- km.enc_key_server_to_client = calculateKey(sh, K, H, (byte) 'D', SessionID, keyLengthSC);
-
- km.integrity_key_client_to_server = calculateKey(sh, K, H, (byte) 'E', SessionID, macLengthCS);
-
- km.integrity_key_server_to_client = calculateKey(sh, K, H, (byte) 'F', SessionID, macLengthSC);
-
- return km;
- }
-}
+ + km.initial_iv_client_to_server = calculateKey(sh, K, H, (byte) 'A', SessionID, blockSizeCS); + + km.initial_iv_server_to_client = calculateKey(sh, K, H, (byte) 'B', SessionID, blockSizeSC); + + km.enc_key_client_to_server = calculateKey(sh, K, H, (byte) 'C', SessionID, keyLengthCS); + + km.enc_key_server_to_client = calculateKey(sh, K, H, (byte) 'D', SessionID, keyLengthSC); + + km.integrity_key_client_to_server = calculateKey(sh, K, H, (byte) 'E', SessionID, macLengthCS); + + km.integrity_key_server_to_client = calculateKey(sh, K, H, (byte) 'F', SessionID, macLengthSC); + + return km; + } +} |