libkpgp: Fix signature key exctraction for GnuPG 2.1

This resolves bug 2883

Signed-off-by: Emanoil Kotsev <deloptes@gmail.com>

libkpgp/kpgpbaseG.cpp

@@ -313,8 +313,24 @@ BaseG::decrypt( Block& block, const char *passphrase )
     index2 = error.find("using", index+15);
     block.setSignatureDate( error.mid(index+15, index2-(index+15)-1) );
     kdDebug(5100) << "Message was signed on '" << block.signatureDate() << "'\n";
-    index2 = error.find("key ID ", index2) + 7;
+    // To handle gnupg > 2.1
-    block.setSignatureKeyId( error.mid(index2,8) );
+    // gpg: Signature made Thu 05 Apr 2018 10:02:50 PM CEST
+    // gpg:                using DSA key A0CF1DC09533E5E87F54DB40F1EEB8CD9FB16A50
+    // gpg: Good signature from "deloptes <deloptes@gmail.com>" [ultimate]
+    // so we need extra check
+    if (error.contains("key ID") > 0) {
+		index2 = error.find("key ID ", index2) + 7;
+		block.setSignatureKeyId( error.mid(index2,8) );
+    }
+    else {
+		index2 = error.find("key ", index2) + 4;
+		// handle variable key size
+		// gpg: Signature made Mon 02 Apr 2018 03:15:08 PM CEST
+		// gpg:                using DSA key 05C82CF57AD1DA46
+		// gpg: Can't check signature: No public key
+		int end =  error.find("\n", index2);
+		block.setSignatureKeyId( error.mid(index2,end-index2) );
+    }
     kdDebug(5100) << "Message was signed with key '" << block.signatureKeyId() << "'\n";
     // move index to start of next line
     index = error.find('\n', index2)+1;
@@ -333,7 +349,7 @@ BaseG::decrypt( Block& block, const char *passphrase )
       index = error.find('"',index);
       index2 = error.find('\n',index+1);
       index2 = error.findRev('"', index2-1);
-      block.setSignatureUserId( error.mid( index+1, index2-index-1 ) );
+      block.setSignatureUserId( TQString::fromLocal8Bit( error.mid( index+1, index2-index-1 ) ) );
     }
     else if( error.find("BAD signature", index) != -1 )
     {
@@ -343,7 +359,7 @@ BaseG::decrypt( Block& block, const char *passphrase )
       index = error.find('"',index);
       index2 = error.find('\n',index+1);
       index2 = error.findRev('"', index2-1);
-      block.setSignatureUserId( error.mid( index+1, index2-index-1 ) );
+      block.setSignatureUserId( TQString::fromLocal8Bit(  error.mid( index+1, index2-index-1 ) ) );
     }
     else if( error.find("Can't find the right public key", index) != -1 )
     {