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minor optimization in I2PDatagramDissector(only verfy signature once)

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This commit is contained in:
dev
2008-06-22 14:07:30 +00:00
parent a8c266402e
commit 4d955f3be5
1 changed files with 23 additions and 10 deletions
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33
core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
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@ -42,6 +42,8 @@ public final class I2PDatagramDissector {
private byte[] rxPayload = new byte[DGRAM_BUFSIZE];
private int rxPayloadLen = 0;
private boolean valid = false;
/**
* Crate a new I2P repliable datagram dissector.
@ -89,11 +91,8 @@ public final class I2PDatagramDissector {
* @throws I2PInvalidDatagramException if the signature verification fails
*/
public byte[] getPayload() throws I2PInvalidDatagramException {
if (!dsaEng.verifySignature(rxSign, rxHashBytes,
rxDest.getSigningPublicKey())) {
throw new I2PInvalidDatagramException("Incorrect I2P repliable datagram signature");
}
this.verifySignature();
byte[] retPayload = new byte[rxPayloadLen];
System.arraycopy(rxPayload, 0, retPayload, 0, rxPayloadLen);
@ -109,11 +108,8 @@ public final class I2PDatagramDissector {
* @throws I2PInvalidDatagramException if the signature verification fails
*/
public Destination getSender() throws I2PInvalidDatagramException {
if (!dsaEng.verifySignature(rxSign, rxHashBytes,
rxDest.getSigningPublicKey())) {
throw new I2PInvalidDatagramException("Incorrect I2P repliable datagram signature");
}
this.verifySignature();
Destination retDest = new Destination();
try {
retDest.fromByteArray(rxDest.toByteArray());
@ -156,4 +152,21 @@ public final class I2PDatagramDissector {
return retDest;
}
/**
* Verify the signature of this datagram (previously loaded with the
* loadI2PDatagram() method)
*/
public void verifySignature() throws I2PInvalidDatagramException {
// first check if it already got validated
if(this.valid)
return;
// now validate
if (!dsaEng.verifySignature(rxSign, rxHashBytes, rxDest.getSigningPublicKey()))
throw new I2PInvalidDatagramException("Incorrect I2P repliable datagram signature");
// set validated
this.valid = true;
}
}