Hi all, while working on a BIP62 implementation I discovered yet another type of malleability: the interpretation of booleans.
Any byte array with non-zero bytes in it (ignoring the highest bit of the last byte, which is the sign bit when interpreting as a number) is interpreted as true, anything else as false. Other than numbers, they're not even restricted to 4 bytes. Worse, the code for dealing with booleans is not very consistent: OP_BOOLAND and OP_BOOLOR first interpret their arguments as numbers, and then compare them to 0 to turn them into boolean values. This means that scripts that use booleans as inputs will be inherently malleable. Given that that seems actually useful (passing in booleans to guide some OP_IF's during execution of several alternatives), I would like to change BIP62 to also state that interpreted booleans must be of minimal encoded size (in addition to numbers). Any opinions for or against? ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
