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The even-S check was based on https://github.com/sipa/bitcoin/commit/a81cd9680 which was replaced by a low-S check in commit e0e14e43d9586409e42919f6cb955540134cda2a Abstract out and fix the check. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
These are standard bitcoin manipulation routines which should be provided by any normal bitcoin library in whatever language you choose. The ones here are standalone ones taken from bitcoin core and some I wrote, many taken from bitcoin-iterate and pasted in here.