Bitcoin/address validation: Difference between revisions
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Write a program that takes a [[wp:bitcoin|bitcoin address]] as argument, and checks whether or not this address is valid. The program can either return a boolean value or throw an exception when not valid. |
Write a program that takes a [[wp:bitcoin|bitcoin address]] as argument, and checks whether or not this address is valid. The program can either return a boolean value or throw an exception when not valid. |
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You can use digest |
You can use a digest library for [[SHA-256]]. |
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==Unix shell== |
==Unix shell== |
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Revision as of 19:38, 27 November 2012
Bitcoin/address validation is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
Write a program that takes a bitcoin address as argument, and checks whether or not this address is valid. The program can either return a boolean value or throw an exception when not valid.
You can use a digest library for SHA-256.
Unix shell
<lang bash>base58=({1..9} {A..H} {J..N} {P..Z} {a..k} {m..z}) bitcoinregex="^[$(printf "%s" "${base58[@]}")]{34}$"
decodeBase58() {
local s=$1
for i in {0..57}
do s="${s//${base58[i]}/ $i}"
done
dc <<< "16o0d${s// /+58*}+f"
}
checksum() {
xxd -p -r <<<"$1" | openssl dgst -sha256 -binary | openssl dgst -sha256 -binary | xxd -p -c 80 | head -c 8
}
checkBitcoinAddress() {
if "$1" =~ $bitcoinregex then h=$(decodeBase58 "$1") checksum "00${h::${#h}-8}" | grep -qi "^${h: -8}$" else return 2 fi
}</lang>