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Minor refactoring and renaming.

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This commit is contained in:
Moxie Marlinspike 2014-07-25 16:57:59 -07:00
parent c330eef7b9
commit eda393b11c
2 changed files with 10 additions and 18 deletions
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24
libaxolotl/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedMessageSecrets.java
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@ -17,32 +17,24 @@
package org.whispersystems.libaxolotl.kdf; package org.whispersystems.libaxolotl.kdf;
import org.whispersystems.libaxolotl.util.ByteUtil;
import javax.crypto.spec.SecretKeySpec; import javax.crypto.spec.SecretKeySpec;
public class DerivedMessageSecrets { public class DerivedMessageSecrets {
public static final int SIZE = 64; public static final int SIZE = 64;
private static final int CIPHER_KEYS_OFFSET = 0; private static final int CIPHER_KEY_LENGTH = 32;
private static final int MAC_KEYS_OFFSET = 32; private static final int MAC_KEY_LENGTH = 32;
private final SecretKeySpec cipherKey; private final SecretKeySpec cipherKey;
private final SecretKeySpec macKey; private final SecretKeySpec macKey;
public DerivedMessageSecrets(byte[] okm) { public DerivedMessageSecrets(byte[] okm) {
this.cipherKey = deriveCipherKey(okm); byte[][] keys = ByteUtil.split(okm, CIPHER_KEY_LENGTH, MAC_KEY_LENGTH);
this.macKey = deriveMacKey(okm);
}
private SecretKeySpec deriveCipherKey(byte[] okm) { this.cipherKey = new SecretKeySpec(keys[0], "AES");
byte[] cipherKey = new byte[32]; this.macKey = new SecretKeySpec(keys[1], "HmacSHA256");
System.arraycopy(okm, CIPHER_KEYS_OFFSET, cipherKey, 0, cipherKey.length);
return new SecretKeySpec(cipherKey, "AES");
}
private SecretKeySpec deriveMacKey(byte[] okm) {
byte[] macKey = new byte[32];
System.arraycopy(okm, MAC_KEYS_OFFSET, macKey, 0, macKey.length);
return new SecretKeySpec(macKey, "HmacSHA256");
} }
public SecretKeySpec getCipherKey() { public SecretKeySpec getCipherKey() {

4
libaxolotl/src/main/java/org/whispersystems/libaxolotl/ratchet/RootKey.java
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@ -39,10 +39,10 @@ public class RootKey {
return key; return key;
} }
public Pair<RootKey, ChainKey> createChain(ECPublicKey theirEphemeral, ECKeyPair ourEphemeral) public Pair<RootKey, ChainKey> createChain(ECPublicKey theirRatchetKey, ECKeyPair ourRatchetKey)
throws InvalidKeyException throws InvalidKeyException
{ {
byte[] sharedSecret = Curve.calculateAgreement(theirEphemeral, ourEphemeral.getPrivateKey()); byte[] sharedSecret = Curve.calculateAgreement(theirRatchetKey, ourRatchetKey.getPrivateKey());
byte[] derivedSecretBytes = kdf.deriveSecrets(sharedSecret, key, "WhisperRatchet".getBytes(), DerivedRootSecrets.SIZE); byte[] derivedSecretBytes = kdf.deriveSecrets(sharedSecret, key, "WhisperRatchet".getBytes(), DerivedRootSecrets.SIZE);
DerivedRootSecrets derivedSecrets = new DerivedRootSecrets(derivedSecretBytes); DerivedRootSecrets derivedSecrets = new DerivedRootSecrets(derivedSecretBytes);