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Code Issues Releases Wiki Activity

Remove superfluous states

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This commit is contained in:
Paul Schaub 2022-10-26 18:22:50 +02:00
parent d8ff266406
commit 4aaecb7df8
2 changed files with 3 additions and 27 deletions
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26
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/syntax_check/PDA.java
View file

@ -67,7 +67,7 @@ public class PDA {
case Signature:
if (stackItem == ops) {
return CorrespondingSignature;
return LiteralMessage;
} else {
throw new MalformedOpenPgpMessageException(this, input, stackItem);
}
@ -96,7 +96,7 @@ public class PDA {
switch (input) {
case Signature:
if (stackItem == ops) {
return CorrespondingSignature;
return CompressedMessage;
} else {
throw new MalformedOpenPgpMessageException(this, input, stackItem);
}
@ -125,7 +125,7 @@ public class PDA {
switch (input) {
case Signature:
if (stackItem == ops) {
return CorrespondingSignature;
return EncryptedMessage;
} else {
throw new MalformedOpenPgpMessageException(this, input, stackItem);
}
@ -147,26 +147,6 @@ public class PDA {
}
},
CorrespondingSignature {
@Override
State transition(InputAlphabet input, PDA automaton) throws MalformedOpenPgpMessageException {
StackAlphabet stackItem = automaton.popStack();
if (input == InputAlphabet.EndOfSequence) {
if (stackItem == terminus && automaton.stack.isEmpty()) {
return Valid;
} else {
// premature end of stream
throw new MalformedOpenPgpMessageException(this, input, stackItem);
}
} else if (input == InputAlphabet.Signature) {
if (stackItem == ops) {
return CorrespondingSignature;
}
}
throw new MalformedOpenPgpMessageException(this, input, stackItem);
}
},
Valid {
@Override
State transition(InputAlphabet input, PDA automaton) throws MalformedOpenPgpMessageException {

4
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/syntax_check/StackAlphabet.java
View file

@ -13,10 +13,6 @@ public enum StackAlphabet {
* OnePassSignature (in case of BC this represents a OnePassSignatureList).
*/
ops,
/**
* ESK. Not used, as BC combines encrypted data with their encrypted session keys.
*/
esk,
/**
* Special symbol representing the end of the message.
*/