#!/usr/bin/perl
use strict;
use Digest::SHA qw( sha256 );

my $phrase = $ARGV[0];
my $iter   = $ARGV[1] || 10;

my $hash = '';
foreach ( 1 .. $iter ) {
  $hash = sha256( $hash.$phrase );
  my( $key, $address ) = string2keypair( $hash );
  print "$key\t$address\n";
}

sub string2keypair {
  my $key = chr(0x80).shift;
  my $hash = substr( sha256( sha256( $key ) ), 0, 4 );
  $key = unpack( 'H*', $key.$hash );
  $key = `./base58encode.sh $key`;
  `./keyconv $key` =~ m|Address: (1.*)|;
  my $address = $1;
  return ( $key, $address );
}

__END__
./base58encode.sh:
#!/bin/bash
base58=({1..9} {A..H} {J..N} {P..Z} {a..k} {m..z})
bc <<<"ibase=16; n=${1^^}; while(n>0) { n%3A ; n/=3A }" |
tac |
while read n
do echo -n ${base58[n]}
done