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Notes about criticality

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This commit is contained in:
Dominik Schürmann 2014-08-19 15:23:37 +02:00
parent 68cce5c0c8
commit 8d668d170c
1 changed files with 15 additions and 2 deletions
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17
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
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@ -914,13 +914,26 @@ public class PgpKeyOperation {
PGPSignatureSubpacketGenerator hashedPacketsGen = new PGPSignatureSubpacketGenerator();
{
hashedPacketsGen.setSignatureCreationTime(true, new Date());
/*
* From RFC about critical subpackets:
* If a subpacket is encountered that is
* marked critical but is unknown to the evaluating software, the
* evaluator SHOULD consider the signature to be in error.
* An evaluator may "recognize" a subpacket, but not implement it. The
* purpose of the critical bit is to allow the signer to tell an
* evaluator that it would prefer a new, unknown feature to generate an
* error than be ignored.
*/
/* non-critical subpackets: */
hashedPacketsGen.setPreferredSymmetricAlgorithms(false, PREFERRED_SYMMETRIC_ALGORITHMS);
hashedPacketsGen.setPreferredHashAlgorithms(false, PREFERRED_HASH_ALGORITHMS);
hashedPacketsGen.setPreferredCompressionAlgorithms(false, PREFERRED_COMPRESSION_ALGORITHMS);
hashedPacketsGen.setPrimaryUserID(false, primary);
/* critical subpackets: */
hashedPacketsGen.setSignatureCreationTime(true, new Date());
// Request that senders add the MDC to the message (authenticate unsigned messages)
hashedPacketsGen.setFeature(true, Features.FEATURE_MODIFICATION_DETECTION);
hashedPacketsGen.setPrimaryUserID(false, primary);
hashedPacketsGen.setKeyFlags(true, flags);
if (expiry > 0) {
hashedPacketsGen.setKeyExpirationTime(