Topic: Zsh/OpenSSL Shell Script Key Generator (Read 5479 times)

checksum() {
    perl -we "print pack 'H*', '$1'" |
    openssl dgst -sha256 -binary |
    openssl dgst -sha256 -binary |
    perl -we "print unpack 'H8', join '', <>"
}

#!/bin/zsh
zparseopts h=help v=verbose c=compressed t=testnet
if [[ -n $help ]]; then
	<generatebitcoinkey Generates a bitcoin key using zsh scripting and OpenSSL
	-h	Print help text
	-v	Verbose output (mainly for debugging)
	-c	Use compressed keys
	-t	Output testnet addresses
EOF
	exit
fi

[[ -n $verbose ]] && openssl version

base58=(1 2 3 4 5 6 7 8 9 A B C D E F G H J K L M N P Q R S T U V W X Y Z a b c d e f g h i j k m n o p q r s t u v w x y z)

capitalizeHex() {
    tr "[a-f]" "[A-F]"
}

encodeBase58() {                                  
    initialones=$(sed -e 's/\(\(00\)*\).*/\1/' -e 's/00/1/g' <<<$1)
    echo -n $initialones
    bc <<<"ibase=16; n=$1; while(n>0) { n%3A ; n/=3A }" |
    tail -r |
    while read n
        do echo -n ${base58[n+1]}
    done
}

checksum() {
    xxd -p -r <<<"$1" |
    openssl dgst -sha256 -binary |
    openssl dgst -sha256 -binary |
    xxd -p -c 80 |
    head -c 8 |
    capitalizeHex
}

hexToAddress() {
    echo "$(encodeBase58 "$2$1$(checksum "$2$1")")"
}

if [[ -n $compressed ]]; then
	convform=compressed
	pubkeybytes=33
	wifTag=01
else
	convform=uncompressed
	pubkeybytes=65
	wifTag=
fi

if [[ -n $testnet ]]; then
	addressPrefix="6F"
	wifPrefix="EF"
else
	addressPrefix="00"
	wifPrefix="80"
fi

privatekey=$(openssl ecparam -genkey -name secp256k1 -conv_form $convform -noout)
openssldescription=$(openssl ec -text -conv_form $convform <<<$privatekey 2>/dev/null)
privatekeyhex=$(head -5 <<<$openssldescription | tail -3 | fmt -120 | sed -e 's/[: ]//g' -e 's/^00//' | awk '{printf "%064s\n", $0}' | capitalizeHex)
publickeyhex=$(openssl ec -pubout -outform DER -conv_form $convform <<<$privatekey 2>/dev/null | tail -c $pubkeybytes | xxd -p -c 80 | capitalizeHex)
publickeyhashhex=$(xxd -r -p <<<$publickeyhex | openssl dgst -sha256 -binary | openssl dgst -rmd160 -binary | xxd -p -c 80 | capitalizeHex)
address=$(hexToAddress $publickeyhashhex $addressPrefix)
privatekeywif=$(hexToAddress $privatekeyhex$wifTag $wifPrefix)

[[ -n $verbose ]] && echo $openssldescription
echo "Private Key Hex:" $privatekeyhex
echo "Private Key WIF:" $privatekeywif
echo "Public Key:" $publickeyhex
[[ -n $verbose ]] && echo "Public Key Hash:" $publickeyhashhex
echo "Address:" $address