Am I missing the something. Just convert the base 64 to hex. The only issue is endianness and you can ignore that if you feel 2**127 is sufficient complexity for the task
use Digest::MD5 qw( md5_hex md5_base64 );
use MIME::Base64;
my $string = 'Am I missing something?';
my $hex = md5_hex( $string );
my $b64 = md5_base64( $string );
print "hex: $hex\nb64: $b64\n";
my $bin = decode_base64( $b64 );
my $h1 = join '', unpack "H*", $bin; # high nybble first
my $h2 = join '', unpack "h*", $bin; # low nybble first
print "h1: $h1\nh2: $h2\n";
# loose one bit of complexity for portablity
print "Checksums are the same!\n" if $h1 eq $hex or $h2 eq $hex;
__DATA__
hex: 8a4d8b4fa3d19e4e5c0755123b57a109
b64: ik2LT6PRnk5cB1USO1ehCQ
h1: 8a4d8b4fa3d19e4e5c0755123b57a109
h2: a8d4b8f43a1de9e4c5705521b3751a90
Checksums are the same!
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