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Crypto: Precalculate Noise init hash

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zzz
2020-10-29 16:51:13 +00:00
parent 190b76d7fd
commit 35012a3bad
2 changed files with 34 additions and 14 deletions
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3
router/java/src/com/southernstorm/noise/protocol/HandshakeState.java
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@ -441,7 +441,8 @@ public class HandshakeState implements Destroyable, Cloneable {
}
// Hash the prologue value.
symmetric.mixHash(emptyPrologue, 0, 0);
// Now precalculated in SymmetricState.
//symmetric.mixHash(emptyPrologue, 0, 0);
// Mix the pre-supplied public keys into the handshake hash.
if (isInitiator) {

45
router/java/src/com/southernstorm/noise/protocol/SymmetricState.java
View File

@ -36,15 +36,30 @@ import javax.crypto.ShortBufferException;
*/
class SymmetricState implements Destroyable, Cloneable {
// precalculated hash of the Noise name
private static final byte[] INIT_HASH_XK;
private static final byte[] INIT_HASH_IK;
private static final byte[] INIT_HASH_N;
// precalculated hash of the Noise name if over 32 bytes, else simply null-padded name
private static final byte[] INIT_CK_XK;
private static final byte[] INIT_CK_IK;
private static final byte[] INIT_CK_N;
// precalculated hash of the hash of the Noise name = mixHash(nullPrologue)
private static final byte[] INIT_HASH_XK = new byte[32];
private static final byte[] INIT_HASH_IK = new byte[32];
private static final byte[] INIT_HASH_N = new byte[32];
static {
INIT_HASH_XK = initHash(HandshakeState.protocolName);
INIT_HASH_IK = initHash(HandshakeState.protocolName2);
INIT_HASH_N = initHash(HandshakeState.protocolName3);
INIT_CK_XK = initHash(HandshakeState.protocolName);
INIT_CK_IK = initHash(HandshakeState.protocolName2);
INIT_CK_N = initHash(HandshakeState.protocolName3);
try {
MessageDigest md = Noise.createHash("SHA256");
md.update(INIT_CK_XK, 0, 32);
md.digest(INIT_HASH_XK, 0, 32);
md.update(INIT_CK_IK, 0, 32);
md.digest(INIT_HASH_IK, 0, 32);
md.update(INIT_CK_N, 0, 32);
md.digest(INIT_HASH_N, 0, 32);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
/**
@ -99,17 +114,21 @@ class SymmetricState implements Destroyable, Cloneable {
h = new byte [hashLength];
prev_h = new byte [hashLength];
byte[] initHash;
if (patternId.equals(HandshakeState.PATTERN_ID_XK))
byte[] initHash, initCK;
if (patternId.equals(HandshakeState.PATTERN_ID_XK)) {
initCK = INIT_CK_XK;
initHash = INIT_HASH_XK;
else if (patternId.equals(HandshakeState.PATTERN_ID_IK))
} else if (patternId.equals(HandshakeState.PATTERN_ID_IK)) {
initCK = INIT_CK_IK;
initHash = INIT_HASH_IK;
else if (patternId.equals(HandshakeState.PATTERN_ID_N))
} else if (patternId.equals(HandshakeState.PATTERN_ID_N)) {
initCK = INIT_CK_N;
initHash = INIT_HASH_N;
else
} else {
throw new IllegalArgumentException("Handshake pattern is not recognized");
}
System.arraycopy(initHash, 0, h, 0, hashLength);
System.arraycopy(h, 0, ck, 0, hashLength);
System.arraycopy(initCK, 0, ck, 0, hashLength);
}
/**