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September 2017 Update

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Ingy döt Net 2017-09-23 10:01:46 +02:00
parent bba7bfd280
commit ba8067c3b7
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Task/Bitcoin-address-validation/Factor/bitcoin-address-validation.factor Normal file
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USING: byte-arrays checksums checksums.sha io.binary kernel math
math.parser sequences ;
IN: rosetta-code.bitcoin.validation
CONSTANT: ALPHABET "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
: base58>bigint ( str -- n )
[ ALPHABET index ]
[ [ 58 * ] [ + ] bi* ] map-reduce ;
: base58> ( str -- bytes ) base58>bigint 25 >be ;
: btc-checksum ( bytes -- checksum-bytes )
21 head 2 [ sha-256 checksum-bytes ] times 4 head ;
: btc-valid? ( str -- ? ) base58> [ btc-checksum ] [ 4 tail* ] bi = ;