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Sign the message with the group's private key if the group is

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restricted, and check the signature if it should be present.
This commit is contained in:
akwizgran
2011-07-25 21:54:49 +01:00
parent 3f61d0c3df
commit a86ef2142f
4 changed files with 139 additions and 72 deletions
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33
components/net/sf/briar/protocol/MessageReader.java
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@@ -5,7 +5,6 @@ import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import net.sf.briar.api.crypto.CryptoComponent;
import net.sf.briar.api.crypto.KeyParser;
@@ -64,12 +63,18 @@ class MessageReader implements ObjectReader<Message> {
if(timestamp < 0L) throw new FormatException();
// Skip the message body
r.readBytes();
// Record the length of the signed data
int messageLength = (int) counting.getCount();
// Record the length of the data covered by the author's signature
int signedByAuthor = (int) counting.getCount();
// Read the author's signature, if there is one
byte[] authorSig = null;
if(author == null) r.readNull();
else authorSig = r.readBytes();
// Record the length of the data covered by the group's signature
int signedByGroup = (int) counting.getCount();
// Read the group's signature, if there is one
byte[] groupSig = null;
if(group.getPublicKey() == null) r.readNull();
else groupSig = r.readBytes();
// That's all, folks
r.removeConsumer(counting);
r.removeConsumer(copying);
@@ -77,16 +82,26 @@ class MessageReader implements ObjectReader<Message> {
// Verify the author's signature, if there is one
if(author != null) {
try {
PublicKey publicKey =
keyParser.parsePublicKey(author.getPublicKey());
signature.initVerify(publicKey);
signature.update(raw, 0, messageLength);
if(!signature.verify(authorSig)) throw new SignatureException();
PublicKey k = keyParser.parsePublicKey(author.getPublicKey());
signature.initVerify(k);
signature.update(raw, 0, signedByAuthor);
if(!signature.verify(authorSig)) throw new FormatException();
} catch(GeneralSecurityException e) {
throw new FormatException();
}
}
// Hash the message, including the signature, to get the message ID
// Verify the group's signature, if there is one
if(group.getPublicKey() != null) {
try {
PublicKey k = keyParser.parsePublicKey(group.getPublicKey());
signature.initVerify(k);
signature.update(raw, 0, signedByGroup);
if(!signature.verify(groupSig)) throw new FormatException();
} catch(GeneralSecurityException e) {
throw new FormatException();
}
}
// Hash the message, including the signatures, to get the message ID
messageDigest.reset();
messageDigest.update(raw);
MessageId id = new MessageId(messageDigest.digest());